I created a NavigationBar and added it to the UIViewController. But after init, the reference turns to nil. I'm new to iOS and OC, I don't know why. Anyone can help? Thank you.
code summary:
#interface ContainerViewController()
#property (nonatomic, retain) UINavigationBar *nav;
#property (nonatomic, retain) UINavigationItem *navItem;
#end
#implementation ContainerViewController
- (instancetype) initWithParams:(NSDictionary *)params {
self = [super init];
if (self) {//...}
return self;
}
- setNavTitle:(NSDictionary *) params {
NSString *title = params[#"title"];
/////////////////////////////////
// here goes wrong
// self.navItem == nil here, why?
/////////////////////////////////
self.navItem.title = title;
}
- (void) viewWillAppear:(Bool)animated {
[super viewWillAppear:NO];
static float navHeight = 64.0;
UIViewController *wvController = [WebView init here];
UINavigationBar *nav = [[UINavigationBar alloc] initWithFrame:CGRectMake(0, 0, CGRectGetWidth(self.view.bounds), navHeight)];
UINavigationItem *navItem = [[UINavigationItem alloc] initWithTitle:title];
nav.items = [NSArray arrayWithObjects: navItem, nil];
///////////////////////////////
// I saved the reference here
//////////////////////////////
[self setNav:nav];
[self setNavItem:navItem];
[self.view addSubview:nav];
[self addChildViewController:wvController];
wvController.view.bounds = CGRectMake(0, 0, CGRectGetWidth(self.view.bounds), CGRectGetHeight(self.view.bounds) - navHeight);
[self.view addSubview:wvController.view];
[wvController didMoveToParentViewController:self];
}
#end
This will be useful for you, kindly check and do
Tutorial point site is very easy to learn some important UI basics if you are working in Objective C
Related
I'm using a contact picker to grab a string, then pass that string to another view controller, however the UILabel is not updating with the data (or any other string).
In the SlingViewController.m logs below, _taggedFriendsNames is being passed successfully.
Perhaps the issue is because the receiving view controller is trying to update the label on another (SlingshotView) view? I don't think that's the case as I've been updating labels in this way in other methods.
The answer is likely related to updating UILabels in general, but I've had no luck after searching.
Things I've checked with no success:
Updating from the main thread asynchronously
#synthesize the label in SlingshotView
calling setDisplay
Included potentially relevant code below. Thanks in advance for any tips!
SlingViewController.m
-(void)updateFriendsPickedLabel:(id)sender {
NSLog(#"updateFriendsPickedLabel: %#", _taggedFriendsNames); // i see this
slingshotView.friendsPickedLabel.text = #"any string"; // i don't see this
}
SlingViewController.h
#class TBMultiselectController;
#class SlingshotView;
#interface SlingViewController : UIViewController
#property (nonatomic, readonly) SlingshotView *slingshotView;
#property(nonatomic) NSString *taggedFriendsNames;
//for friend picker
-(void)updateFriendsPickedLabel:(id)sender;
#end
MultiSelectViewController.m
- (IBAction) sendButton: (id) sender {
NSMutableString *myString = [[NSMutableString alloc]initWithString:#""];
for (int i=0; i < self.selectedContacts.count; i++) {
Contact *myContact = self.selectedContacts[i];
[myString appendString:[NSString stringWithFormat:#"%# %# ", myContact.firstName, myContact.lastName]];
}
SlingViewController *svc = [[SlingViewController alloc] init];
svc.taggedFriendsNames = myString;
[svc updateFriendsPickedLabel:self];
[self.navigationController dismissViewControllerAnimated:YES completion:nil];
}
MultiSelectViewController.h
#protocol TBMultiselectControllerDelegate;
#class SlingViewController;
#interface TBMultiselectController : UIViewController <UITableViewDataSource, UITableViewDelegate, UISearchDisplayDelegate, TBContactsGrabberDelegate>
#property (nonatomic, assign) id<TBMultiselectControllerDelegate> delegate;
- (IBAction)sendButton: (id) sender;
#end
#protocol TBMultiselectControllerDelegate <NSObject>
-(void)updateFriendsPickedLabel:(id)sender;
#end
SlingshotView.h
#property (strong, nonatomic) UILabel *friendsPickedLabel;
SlingshotView.m
#synthesize friendsPickedLabel;
...
- (id)initWithFrame:(CGRect)frame {
if ((self = [super initWithFrame:frame])) {
CGRect screenRect = [[UIScreen mainScreen] bounds];
CGRect imageFrame = CGRectMake(0, 0, screenRect.size.width, screenRect.size.height);
contentView = [[UIView alloc] initWithFrame:frame];
[contentView setBackgroundColor:[UIColor whiteColor]];
[contentView setAutoresizingMask:UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight];
[self addSubview:contentView];
self.friendsPickedLabel = [[UILabel alloc] initWithFrame:CGRectMake(10, screenRect.size.height/2-100, screenRect.size.width-20, 200)];
self.friendsPickedLabel.shadowColor = [UIColor darkGrayColor];
self.friendsPickedLabel.numberOfLines = 0;
self.friendsPickedLabel.shadowOffset = CGSizeMake(0.5, 0.5);
self.friendsPickedLabel.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0.0];
[self.friendsPickedLabel setTextAlignment:NSTextAlignmentLeft];
self.friendsPickedLabel.textColor = [UIColor whiteColor];
self.friendsPickedLabel.font = [UIFont fontWithName:#"HelveticaNeue-Bold" size:24];
[contentView addSubview:self.friendsPickedLabel];
You are reallocating this..
SlingViewController *svc = [[SlingViewController alloc] init];
svc.taggedFriendsNames = myString;
[svc updateFriendsPickedLabel:self];
Meaning your
slingshotView.friendsPickedLabel becomes nil..
And you are calling/using the delegate the wrong way, i think it suppose to be
[self.delegate updateFriendsPickedLabel:#"YourData To be Passed"];
From your code you are using the -(void)updateFriendsPickedLabel:(id)sender; inside SlingViewController and not the delegate, you are not implementing the delegate either..
Yes the -(void)updateFriendsPickedLabel:(id)sender; method is called, bacause you are calling it directly from the class..
SlingViewController.h
#interface SlingViewController : UIViewController < TBMultiselectControllerDelegate > // for delegate implementation
#property (nonatomic, readonly) SlingshotView *slingshotView;
#property(nonatomic) NSString *taggedFriendsNames;
//for friend picker
//-(void)updateFriendsPickedLabel:(id)sender;
#end
MultiSelectViewController.m
- (IBAction) sendButton: (id) sender {
NSMutableString *myString = [[NSMutableString alloc]initWithString:#""];
for (int i=0; i < self.selectedContacts.count; i++) {
Contact *myContact = self.selectedContacts[i];
[myString appendString:[NSString stringWithFormat:#"%# %# ", myContact.firstName, myContact.lastName]];
}
/*
SlingViewController *svc = [[SlingViewController alloc] init];
svc.taggedFriendsNames = myString;
[svc updateFriendsPickedLabel:self];
*/
[self.delegate updateFriendsPickedLabel:#"YourString"];
// this will call the method in your implementation class
[self.navigationController dismissViewControllerAnimated:YES completion:nil];
}
Hmm.. I Think you have implemented the delegates the wrong way.
This is suppose to be a comment but its too long..
I have tried modify my code many times, but still can't pass variable from UIViewController to UIView, variable always return (null).
// BPGraphView.h
#interface BPGraphView : UIView
#property (nonatomic, retain) NSString *test;
#end
// BPGraphView.m
#import "BPGraphView.h"
#implementation BPGraphView
#synthesize test;
- (instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
NSLog(#"test %#",test);
if (self) {
// Initialization code
}
return self;
}
- (void)drawRect:(CGRect)rect
{
NSLog(#"draw %#", test); // always return (null)
if ([test isEqual:#"something"]) {
[self drawOutLine];
}
}
#end
// BloodPressureViewController.m
- (void)viewDidLoad
{
BPGraphView * graphview=[[BPGraphView alloc] init];
graphview.test = #"something";
}
In your code:
- (void)viewDidLoad
{
BPGraphView * graphview=[[BPGraphView alloc] init];
graphview.test = #"dd";
}
The variable graphview is basically destroyed once the viewDidLoad is run to finish. It will never get a chance to run drawRect.
Now the question is how should you define a instance variable of BPGraphView in your UIViewController. The easiest way should be adding a BPGraphView onto your view's xib file and link to an IBOutlet in your UIViewController. In this way, you should be able to assign to test
#IBOutlet BPGraphView graphview;
- (void)viewDidLoad
{
graphview.test = #"dd";
}
Without setting a frame, drawRect will not be called.
BPGraphView * graphview=[[BPGraphView alloc] initWithFrame:CGRectMake(0, 0, 200, 200)];
graphview.test = #"something";
[self.view addSubview:graphview];
I tried this,it works well,in your code,drawRect is not called
BPGraphView * graphview=[[BPGraphView alloc] init];
graphview.test = #"dd";
[graphview drawRect:CGRectMake(0, 0, 0, 0)];
I am trying to call another method with Delegate and protocols in my app. I need to send the variable "myData" to another view but for some reasons it doesn't works. I don't know what I am doing wrong with the implementation of delegates and protocols. The delegate never call the action of the protocol.
Sorry I'm new with this.
BLEViewController.h
#import <UIKit/UIKit.h>
#import "BLE.h"
#protocol EnviarDatos <NSObject>
//Metodo que se manda llamar pero se implementa en otra clase
-(void) actualizaDatos:(NSData*)Data;
#end
#interface BLEViewController : UITableViewController <BLEDelegate>
{
//id <EnviarDatos> delegate;
}
#property (nonatomic,assign)id delegate;
#property (nonatomic, retain) NSData *myData;
+ (BLE*) theBLEObject;
- (void) scanForPeripherals;
- (IBAction)connect:(id)sender;
-(void) activaProtocolo;
#end
BLEViewController.m
//
// BLEViewController.m
// DL_RemoteBLE_02
//
// Created by Dave Lichtenstein on 3/16/14.
// Copyright (c) 2014 Dave Lichtenstein. All rights reserved.
//
#import "BLEViewController.h"
static BLE* ble;
static UILabel *statusLabel;
static NSString* connectionStatus = #"Not connected!";
#interface BLEViewController ()
#end
#implementation BLEViewController
#synthesize delegate;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
if(ble==nil)
{
// Create our Bluetooth Low Energy object
//
ble = [[BLE alloc] init];
[ble controlSetup];
ble.delegate = self;
}
// Create a toolbar at the bottom of the screen to show status text, etc.
//
// get screen size
//
CGRect screenRect = [[UIScreen mainScreen] bounds];
CGFloat screenWidth = screenRect.size.width;
CGFloat screenHeight = screenRect.size.height;
CGFloat toolbarHeight = 50.0;
CGFloat labelHeight = 50.0;
if(statusLabel==nil) // only create once
{
// create our status label object
//
statusLabel = [[UILabel alloc] initWithFrame:CGRectMake(5, screenHeight-toolbarHeight-labelHeight, screenWidth, labelHeight)];
statusLabel.backgroundColor = [UIColor clearColor];
statusLabel.textColor = [UIColor blackColor];
statusLabel.font = [UIFont boldSystemFontOfSize:15];
statusLabel.text = #"Connection Status:";
}
// create a toolbar
//
UIToolbar *toolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0,screenHeight-toolbarHeight,screenWidth,toolbarHeight)];
toolbar.tintColor = [UIColor blackColor];
/*UILabel* label = [[UILabel alloc] initWithFrame:CGRectMake(5, 5, 150, 20)];
label.backgroundColor = [UIColor clearColor];
label.textColor = [UIColor blackColor];
label.font = [UIFont boldSystemFontOfSize:15];
label.text = #"Status:";
UIBarButtonItem *labeltext = [[UIBarButtonItem alloc] initWithCustomView:label];
UIBarButtonItem *button = [[UIBarButtonItem alloc]initWithTitle:#"" style:UIBarButtonItemStyleDone target:self action:nil];
NSArray *items = [NSArray arrayWithObjects:statusLabel, nil];
toolbar.items = items;
*/
[self.view addSubview:statusLabel];
[self.view addSubview:toolbar];
// Update our status label
statusLabel.text = connectionStatus;
_myData = [[NSData alloc]init];
delegate = self;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
//-------------------------------------------------------
// methods
/////////////////////////////////////////////////////////
+ (BLE*) theBLEObject
{
return ble;
}
-(void) connectionTimer:(NSTimer *)timer
{
if (ble.peripherals.count > 0)
{
[ble connectPeripheral:[ble.peripherals objectAtIndex:0]];
}
NSLog(#"connectionTimer"); // diag
}
// We call this when the view loads to try to connect to our bluetooth perepheral
//
- (void) scanForPeripherals
{
if (ble.activePeripheral)
if(ble.activePeripheral.state == CBPeripheralStateConnected)
{
statusLabel.text = #"Disconnectng from peripheral...";
[[ble CM] cancelPeripheralConnection:[ble activePeripheral]];
return;
}
if (ble.peripherals)
ble.peripherals = nil;
NSLog(#"scanning...");
statusLabel.text = #"Scanning for peripherals...";
[ble findBLEPeripherals:2];
[NSTimer scheduledTimerWithTimeInterval:(float)2.0 target:self selector:#selector(connectionTimer:) userInfo:nil repeats:NO];
//[indConnecting startAnimating];
}
- (IBAction)connect:(id)sender {
[self scanForPeripherals];
}
///////////////////////////////////////////////////////////
#pragma mark - BLE delegate
///////////////////////////////////////////////////////////
NSTimer *rssiTimer;
// When Connected, this will be called
-(void) bleDidConnect
{
NSLog(#"->Connected");
statusLabel.text = #"Connected!";
connectionStatus = #"Connected!";
// Schedule to read RSSI every 1 sec.
rssiTimer = [NSTimer scheduledTimerWithTimeInterval:(float)1.0 target:self selector:#selector(readRSSITimer:) userInfo:nil repeats:YES];
}
// When RSSI is changed, this will be called
-(void) bleDidUpdateRSSI:(NSNumber *) rssi
{
// Append the rssi value to our status label
//
NSString *temp = [NSString stringWithFormat:#"%# (%#)", connectionStatus, rssi];
statusLabel.text = temp;
}
-(void) readRSSITimer:(NSTimer *)timer
{
[ble readRSSI];
}
// When data is comming, this will be called
-(void) bleDidReceiveData:(unsigned char *)data length:(int)length
{
NSData *d = [NSData dataWithBytes:data length:length];
_myData = [NSData dataWithBytes:data length:length];
NSString *s = [[NSString alloc] initWithData:d encoding:NSUTF8StringEncoding];
NSLog(#"Datos en String %#",s);
//_datosdelegate = self;
//Is anyone listening
if([delegate respondsToSelector:#selector(actualizaDatos:)])
{
//send the delegate function with the amount entered by the user
[delegate actualizaDatos:_myData];
NSLog(#"Entro delegado");
}
}
- (void)bleDidDisconnect
{
NSLog(#"->Disconnected");
connectionStatus = #"Disconnected!";
statusLabel.text = #"Disconnected!";
[rssiTimer invalidate];
}
#end
sevenSegmentsViewController.h
#import <UIKit/UIKit.h>
#import "BLEViewController.h"
#import "BLE.h"
#interface sevenSegmentsViewController : UIViewController<EnviarDatos>{
UIImage *unoON;
UIImage *dosON;
UIImage *tresON;
UIImage *cuatroON;
UIImage *cincoON;
UIImage *seisON;
UIImage *sieteON;
UIImage *unoOFF;
UIImage *dosOFF;
UIImage *tresOFF;
UIImage *cuatroOFF;
UIImage *cincoOFF;
UIImage *seisOFF;
UIImage *sieteOFF;
}
#property (strong, nonatomic) IBOutlet UIImageView *uno;
#property (strong, nonatomic) IBOutlet UIImageView *dos;
#property (strong, nonatomic) IBOutlet UIImageView *tres;
#property (strong, nonatomic) IBOutlet UIImageView *cuatro;
#property (strong, nonatomic) IBOutlet UIImageView *cinco;
#property (strong, nonatomic) IBOutlet UIImageView *seis;
#property (strong, nonatomic) IBOutlet UIImageView *siete;
#end
sevenSegmentsViewController.m
//
// sevenSegmentsViewController.m
// iShield
//
// Created by Victor Carreño on 29/03/14.
// Copyright (c) 2014 RedBearLab. All rights reserved.
//
#import "sevenSegmentsViewController.h"
#interface sevenSegmentsViewController ()
#end
#implementation sevenSegmentsViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
unoOFF = [UIImage imageNamed:#"7segnh.png"];
dosOFF = [UIImage imageNamed:#"7segnv.png"];
tresOFF = [UIImage imageNamed:#"7segnv.png"];
cuatroOFF =[UIImage imageNamed:#"7segnh.png"];
cincoOFF = [UIImage imageNamed:#"7segnh.png"];
seisOFF = [UIImage imageNamed:#"7segnv.png"];
sieteOFF = [UIImage imageNamed:#"7segnh.png"];
unoON = [UIImage imageNamed:#"7segvh.png"];
dosON = [UIImage imageNamed:#"7segvv.png"];
tresON = [UIImage imageNamed:#"7segvv.png"];
cuatroON =[UIImage imageNamed:#"7segvh.png"];
cincoON = [UIImage imageNamed:#"7segvh.png"];
seisON = [UIImage imageNamed:#"7segvv.png"];
sieteON = [UIImage imageNamed:#"7segvh.png"];
_uno = [[UIImageView alloc]initWithImage:unoOFF];
_dos = [[UIImageView alloc]initWithImage:dosOFF];
_tres = [[UIImageView alloc]initWithImage:tresOFF];
_cuatro = [[UIImageView alloc]initWithImage:cuatroOFF];
_cinco = [[UIImageView alloc]initWithImage:cincoOFF];
_seis = [[UIImageView alloc]initWithImage:seisOFF];
_siete = [[UIImageView alloc]initWithImage:sieteOFF];
//BLEViewController *myBLE = [[BLEViewController alloc]init];
//BLE *myBLE = [BLEViewController theBLEObject];
//NSLog(#"%#", myBLE.myData);
BLEViewController *myBLE = [[BLEViewController alloc]init];
myBLE.delegate = self;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
/*
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
#pragma mark Delegado de Actualizar datos
-(void) actualizaDatos :(NSData *)myData{
NSLog(#"Datos recividos");
NSLog(#"Imprimio mi data con exitos %#", myData);
}
#end
In a nutshell, your BLEViewController is setting its delegate property to "self" when I think you want it to get set to an instance of "sevenSegmentsViewController". As a result the "if([delegate respondsToSelector:..." test is failing and you are never hitting the call to actualizaDatos. If you are using protocols correctly, you don't really need to test for "respondsToSelector" because by definition, the delegate must support the protocol.
The compiler and IDE are not showing you the error because you declared the property of the BLEViewController as just type "id" instead of
id<EnviarDatos>
If you fix the property declaration to say that your delegate must support the right protocol, you'll immediately see the errors highlighted.
I'm struggling with a retaining issue between two of my UIViewControllers. The view controllers are never deleted causing my app memory to keep growing memory consumption.
UITitleScreenViewController is my initial view controller. When I go from it to UIChooseAntViewController (a choose player screen) I want to relinquish ownership of UITitleViewController but as you can see in the instruments below the controller is still retained after the transition:
The second image is the retain/release history. All entries prior to #133 were issued on the app startup. I believe #133 and #140 are pairs created by the storyboard segue. So whose responsibility is to issue that extra release to destroy the controller? I tried to set self.view = nil on my willDidDisappear method but no deal.
Not only it is not releasing the controllers but it is creating new instances of them each time a transition. For instance, when I come back from ChooseAnt to Title it creates another instance of UITitleViewController!
Things that are important to say:
1) NSZombies flag is not ticked in the target scheme
2) There are no blocks in my UITitleViewController, and I commented out all blocks in UIChooseAntController. In fact these controllers are very simple. UITitle is entirely defined via storyboard (just a view with a background and two buttons performing segues)
while UIChooseAnt is a control that presents a background and a swipe interface to display available characters and radio buttons. The segue is performed programatically by calling [self performSegueWithIdentifier];
3) I don't know if this matters but the segues are defined as modal and have no animation.
EDIT: 4) None of the the controllers reference each other.
Below is the source code for the TitleViewController
This problem is driving me crazy. If anyone could shed some light on it. Anything would be of great help! Thanks!
#interface SMTitleScreenViewController ()
#property (weak, nonatomic) IBOutlet UIButton *buttonPlay;
#property (weak, nonatomic) IBOutlet UIButton *buttonCamera;
- (IBAction)onButtonPlay:(id)sender;
- (IBAction)onButtonCamera:(id)sender;
#end
#implementation SMTitleScreenViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self)
{
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
UIColor* color = [UIColor colorWithRed:0.2509f green:0.1176f blue:0.0745f alpha:1.0f];
UIFont* font = [UIFont fontWithName:#"Jungle Roar" size:BUTTON_FONT_SIZE];
NSString* playString = NSLocalizedString(#"Play", #"");
NSString* cameraString = NSLocalizedString(#"Camera", #"");
[self.buttonPlay setTitle:playString forState:UIControlStateNormal];
[self.buttonPlay setTitle:playString forState:UIControlStateHighlighted];
[self.buttonPlay setTitleColor:color forState:UIControlStateNormal];
[self.buttonPlay setTitleColor:color forState:UIControlStateHighlighted];
self.buttonPlay.titleLabel.font = font;
[self.buttonCamera setTitle:cameraString forState:UIControlStateNormal];
[self.buttonCamera setTitle:cameraString forState:UIControlStateHighlighted];
[self.buttonCamera setTitleColor:color forState:UIControlStateNormal];
[self.buttonCamera setTitleColor:color forState:UIControlStateHighlighted];
self.buttonCamera.titleLabel.font = font;
}
- (void) viewDidDisappear:(BOOL)animated
{
if ([self.view window] == nil)
{
self.view = nil;
}
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
if ([self.view window] == nil)
{
self.view = nil;
}
}
- (IBAction)onButtonPlay:(id)sender
{
}
- (IBAction)onButtonCamera:(id)sender
{
}
EDIT: UIChooseAntViewController (as requested)
#interface SMChooseAntViewController ()
#property (strong, nonatomic) UIImageView* rope;
#property (strong, nonatomic) UIImageView* antFrontLayer;
#property (strong, nonatomic) UIImageView* antBackLayer;
#property (strong, nonatomic) NSArray* antFrontImages;
#property (strong, nonatomic) NSArray* antBackImages;
#property (strong, nonatomic) NSArray* antNameImages;
#property (strong, nonatomic) UIButton* leftButton;
#property (strong, nonatomic) UIButton* rightButton;
#property (strong, nonatomic) UIButton* confirmButton;
#property (nonatomic) NSUInteger selectedAntID;
#property (strong, nonatomic) UIImage* radioImageHighlighted;
#property (strong, nonatomic) UIImage* radioImage;
#property (strong, nonatomic) NSMutableArray* radioViews;
#property (weak, nonatomic) IBOutlet UILabel *antDescriptionLabel;
#property (weak, nonatomic) IBOutlet UIImageView *antDescriptionBG;
#property (strong, nonatomic) UIImageView* antNameView;
#property (strong, nonatomic) UISwipeGestureRecognizer* leftSwipeRecognizer;
#property (strong, nonatomic) UISwipeGestureRecognizer* rightSwipeRecognizer;
- (void) onArrowButton:(id)sender;
- (void) onConfirmButton:(id)sender;
- (void) respondToSwipe:(UISwipeGestureRecognizer*)recognizer;
#end
#implementation SMChooseAntViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self)
{
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
CGSize screenSize = [[UIScreen mainScreen] bounds].size;
// Needed to come in between front and back player image layers
UIImage* ropeImage = [UIImage imageNamed:ROPE_IMAGE_PATH];
self.rope = [[UIImageView alloc] initWithImage:ropeImage];
self.rope.center = CGPointMake(screenSize.width / 2.0f, ropeImage.size.height / 2.0f);
UIColor* brownColor = [UIColor colorWithRed:0.2509f green:0.1176f blue:0.0745f alpha:1.0f];
self.antDescriptionLabel.textColor = brownColor;
self.antDescriptionLabel.numberOfLines = 0;
NSArray* antNames = [SMProfile antNames];
// Cache available Player Views in a NSArray
UIImage* frontImages[MAX_AVAILABLE_ANTS];
UIImage* backImages[MAX_AVAILABLE_ANTS];
UIImage* nameImages[MAX_AVAILABLE_ANTS];
for (NSUInteger i = 0; i < MAX_AVAILABLE_ANTS; ++i)
{
NSString* antName = [antNames objectAtIndex:i];
frontImages[i] = [SMImage imageNamed:[NSString stringWithFormat:#"%#_title_front.png", antName]];
backImages[i] = [SMImage imageNamed:[NSString stringWithFormat:#"%#_title_back.png", antName]];
nameImages[i] = [SMImage imageNamed:[NSString stringWithFormat:#"%#_name.png", antName]];
}
self.antFrontImages = [NSArray arrayWithObjects:frontImages[0], frontImages[1], frontImages[2], nil];
self.antBackImages = [NSArray arrayWithObjects:backImages[0], backImages[1], backImages[2], nil];
self.antNameImages = [NSArray arrayWithObjects:nameImages[0], nameImages[1], nameImages[2], nil];
// Load Selected player from profile
SMProfile* profile = [SMProfile mainProfile];
self.selectedAntID = profile.antID.unsignedIntegerValue;
self.antFrontLayer = [[UIImageView alloc] initWithImage:[self.antFrontImages objectAtIndex:self.selectedAntID]];
self.antBackLayer = [[UIImageView alloc] initWithImage:[self.antBackImages objectAtIndex:self.selectedAntID]];
self.antNameView = [[UIImageView alloc] initWithImage:[self.antNameImages objectAtIndex:self.selectedAntID]];
self.antNameView.center = CGPointMake(screenSize.width / 2.0f, self.antDescriptionBG.frame.origin.y);
NSString* antDescriptionKey = [NSString stringWithFormat:#"AntDescription%lu", (unsigned long)self.selectedAntID];
self.antDescriptionLabel.text = NSLocalizedString(antDescriptionKey, #"");
self.antDescriptionLabel.numberOfLines = 0;
self.antDescriptionLabel.adjustsFontSizeToFitWidth = YES;
self.antFrontLayer.center = CGPointMake(screenSize.width / 2.0f, ropeImage.size.height * 0.75f);
self.antBackLayer.center = self.antFrontLayer.center;
// Here a perform button creation, loading and positioning
// No blocks are being called
// add Target to buttons
[self.leftButton addTarget:self action:#selector(onArrowButton:) forControlEvents:UIControlEventTouchUpInside];
[self.rightButton addTarget:self action:#selector(onArrowButton:) forControlEvents:UIControlEventTouchUpInside];
[self.confirmButton addTarget:self action:#selector(onConfirmButton:) forControlEvents:UIControlEventTouchUpInside];
// Create and configure SwipeRecognizers
self.leftSwipeRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(respondToSwipe:)];
self.leftSwipeRecognizer.direction = UISwipeGestureRecognizerDirectionLeft;
[self.view addGestureRecognizer:self.leftSwipeRecognizer];
self.rightSwipeRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(respondToSwipe:)];
self.rightSwipeRecognizer.direction = UISwipeGestureRecognizerDirectionRight;
[self.view addGestureRecognizer:self.rightSwipeRecognizer];
// Here a create a custom page control scheme. I load two radio button images
// create views and add them to the root view node.
// Add remaining view to the hierarchy
[self.view addSubview:self.antBackLayer];
[self.view addSubview:self.rope];
[self.view addSubview:self.antFrontLayer];
[self.view addSubview:self.confirmButton];
[self.view bringSubviewToFront:self.antDescriptionBG];
[self.view bringSubviewToFront:self.antDescriptionLabel];
[self.view addSubview:self.leftButton];
[self.view addSubview:self.rightButton];
[self.view addSubview:self.antNameView];
[self.view bringSubviewToFront:[self.radioViews objectAtIndex:0]];
}
- (void) viewDidDisappear:(BOOL)animated
{
if ([self.view window] == nil)
{
self.rope = nil;
self.antFrontLayer = nil;
self.antBackLayer = nil;
self.antFrontImages = nil;
self.antBackImages = nil;
self.antNameImages = nil;
self.leftButton = nil;
self.rightButton = nil;
self.confirmButton = nil;
self.radioImageHighlighted = nil;
self.radioImage = nil;
self.radioViews = nil;
self.antNameView = nil;
self.leftSwipeRecognizer = nil;
self.rightSwipeRecognizer = nil;
self.view = nil;
}
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
if ([self.view window] == nil)
{
self.view = nil;
}
}
- (void)onArrowButton:(id)sender
{
UIButton* button = (UIButton*)sender;
NSInteger direction = button.tag;
// if on boundaries do nothing (first ant selected and swipe left or last ant selected and swipe right)
if ((self.selectedAntID == 0 && direction == -1) || (self.selectedAntID == (MAX_AVAILABLE_ANTS - 1) && direction == 1))
{
return;
}
// Update Radio Buttons. Unselect previous and select next.
UIImageView* currRadio = [self.radioViews objectAtIndex:self.selectedAntID];
currRadio.image = self.radioImage;
self.selectedAntID = (self.selectedAntID + MAX_AVAILABLE_ANTS + direction) % MAX_AVAILABLE_ANTS;
UIImageView* nextRadio = [self.radioViews objectAtIndex:self.selectedAntID];
nextRadio.image = self.radioImageHighlighted;
self.antFrontLayer.image = [self.antFrontImages objectAtIndex:self.selectedAntID];
self.antBackLayer.image = [self.antBackImages objectAtIndex:self.selectedAntID];
self.antNameView.image = [self.antNameImages objectAtIndex:self.selectedAntID];
// here I was issuing some block to perform the swipe animation for the ant image views. I commented them and I'm just replacing the images now (3 lines above)
}
- (void)onConfirmButton:(id)sender
{
// Save player choice to profile and perform segue
SMProfile* profile = [SMProfile mainProfile];
profile.antID = [NSNumber numberWithUnsignedInt:self.selectedAntID];
[profile save];
[self performSegueWithIdentifier:#"chooseAntToStageSelect" sender:self];
}
- (void) respondToSwipe:(UISwipeGestureRecognizer *)recognizer
{
// forward swipe to onArrowButton message
if (recognizer.direction == UISwipeGestureRecognizerDirectionLeft)
{
[self onArrowButton:self.rightButton];
}
else if (recognizer.direction == UISwipeGestureRecognizerDirectionRight)
{
[self onArrowButton:self.leftButton];
}
}
#end
When presenting B view controller from A, A will not release as A is the presentingViewController (please refer to the sdk doc).
Or if A,B are sub view controller of a navigation controller, A is store int he push stack which is not removed when pushing to B.
You are pushing a view controller on to a stack hence until the last one is not popped, the controller will not be released.
To go deep into dependencies on childs read the the article below.
Greatly explained, i am sure it'll help. :)
http://www.cocoawithlove.com/2009/07/rules-to-avoid-retain-cycles.html
I'm very new to iOS programming (Coming from Java / C++). I'm trying to set up an app with a TabBarController of which one tab should be a SplitView. I've done my research and I know that UISplitview will not work and everywhere people recommend using the MGSplitViewController. I've looked at the demo but I just can't figure out how to use it without it beeing the app's root view and can't find any sample code that could help
So here is what I do with the classes from the demo in a separate UIViewController class that I afterwards add to the TabBarController: This is my class:
#import <UIKit/UIKit.h>
#import "MGSplitCornersView.h"
#import "RootViewController.h"
#import "DetailViewController.h"
#interface ChannelViewController : UIViewController {
MGSplitViewController *splitViewController;
RootViewController *rootViewController;
DetailViewController *detailViewController;
}
#property (nonatomic, retain) MGSplitViewController *splitViewController;
#property (nonatomic, retain) RootViewController *rootViewController;
#property (nonatomic, retain) DetailViewController *detailViewController;
#end
And this is my desperate try to set it up
- (id)initWithTabBar
{
self = [super init];
//this is the label on the tab button itself
self.title = #"SplitView";
//use whatever image you want and add it to your project
//self.tabBarItem.image = [UIImage imageNamed:#"name_gray.png"];
// set the long name shown in the navigation bar at the top
self.navigationItem.title=#"Nav Title";
self.splitViewController = [[MGSplitViewController alloc] init];
self.rootViewController = [[RootViewController alloc] init];
self.detailViewController = [[DetailViewController alloc] init];
[self.splitViewController setDetailViewController:detailViewController];
[self.splitViewController setMasterViewController:rootViewController];
[self.view addSubview:splitViewController.view];
[self.rootViewController performSelector:#selector(selectFirstRow) withObject:nil afterDelay:0];
[self.detailViewController performSelector:#selector(configureView) withObject:nil afterDelay:0];
if (NO) { // whether to allow dragging the divider to move the split.
splitViewController.splitWidth = 15.0; // make it wide enough to actually drag!
splitViewController.allowsDraggingDivider = YES;
}
return self;
}
I guess I'm doing something wrong with delegates? Or do I have something else mixed up?
Is the demo doing things in the IB that I can't see in the code?
I get the split view but no content and especially no navigation bar with the buttons the demo comes with.
I'd be very thankful for hints or sample code!
Ok manny, here we go. This is my working code for the interface:
#import <UIKit/UIKit.h>
#import "MGSplitViewController.h"
#import "ecbView.h"
#import "ecbCalc.h"
#interface splitMain : MGSplitViewController <UIPopoverControllerDelegate,
MGSplitViewControllerDelegate>
{
IBOutlet UIPopoverController* popoverController;
IBOutlet UINavigationController* naviController;
IBOutlet ecbCalc* viewCalcLeft;
IBOutlet ecbView* euroRatesRight;
UIBarButtonItem* savedButtonItem;
BOOL keepMasterInPortraitMode;
BOOL memoryWasDropped;
BOOL viewLoaded;
}
#property (nonatomic, retain) UIPopoverController* popoverController;
#property (nonatomic, retain) UINavigationController* naviController;
#property (nonatomic, retain) ecbCalc* viewCalcLeft;
#property (nonatomic, retain) ecbView* euroRatesRight;
#property (nonatomic, retain) UIBarButtonItem* savedButtonItem;
#property (nonatomic, readonly) BOOL keepMasterInPortraitMode;
#property (nonatomic, readonly) BOOL memoryWasDropped;
#property (nonatomic, readonly) BOOL viewLoaded;
- (void)dismissPopoverController: (BOOL)animated;
- (void)settingsChanged;
#end
and here excerpts from implementation file:
- (id)initWithCoder:(NSCoder *)aDecoder
{
if ((self = [super initWithCoder:aDecoder]))
{
// my initialization...
}
return self;
}
// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView
{
CGRect rectFrame = CGRectMake(0.0, 20.0, 768.0, 1004.0 - 48.0); // being above a tab bar!
viewLoaded = NO;
self.view = [[UIView alloc] initWithFrame:rectFrame];
viewCalcLeft = [[ecbCalc alloc] initWithNibName:#"ecbCalc" bundle:nil];
euroRatesRight = [[ecbView alloc] initWithNibName:#"ecbView-iPad" bundle:nil];
naviController = [[UINavigationController alloc] initWithRootViewController:self.viewCalcLeft];
naviController.navigationBar.barStyle = UIBarStyleBlack;
naviController.title = nil;
viewCalcLeft.title = NSLocalizedString(#"BtnTitleCalc", #"");
viewCalcLeft.view.hidden = NO;
NSUserDefaults* prefs = [NSUserDefaults standardUserDefaults];
if ([prefs objectForKey:#"iPadAlwaysSplitTableView"] != nil)
self.keepMasterInPortraitMode = [prefs boolForKey:#"iPadAlwaysSplitTableView"];
else
self.keepMasterInPortraitMode = YES;
NSArray* theViewControllers = [NSArray arrayWithObjects:self.naviController, self.euroRatesRight, nil];
[self setViewControllers:theViewControllers];
[self setDelegate:self];
[self setShowsMasterInPortrait:keepMasterInPortraitMode];
}
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
// protection because this one is called twice
if (viewLoaded)
return;
[super viewDidLoad];
if (memoryWasDropped)
{
if (!self.keepMasterInPortraitMode && UIInterfaceOrientationIsPortrait(self.interfaceOrientation))
{
// recreate popover controller
self.popoverController = [[UIPopoverController alloc] initWithContentViewController:self.viewCalcLeft];
}
}
viewLoaded = YES;
}
- (void)didReceiveMemoryWarning
{
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
memoryWasDropped = YES;
// Release any cached data, images, etc. that aren't in use.
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
[self dismissPopoverController:NO];
self.popoverController = nil;
self.naviController = nil;
self.viewCalcLeft = nil;
self.euroRatesRight = nil;
viewLoaded = NO;
}
My MainWindow.xib has a UITabBarController and the button for splitMain is configured for this class but with an empty xib entry. So creation has to go via loadView. Maybe I could have done the viewDidLoad stuff within loadView ... but so I had to protect viewDidLoad from being called twice. That happens in loadView as soon as the view is instantiated from MGSplitViewController class because the initWithCoder there is calling [self setup]. In that function the frame rect is calculated with self.view.bounds so that viewDidLoad is called again because the view doesn't exist yet. Maybe one could implement a workaround within MGSplitViewController.m but I was too lazy doing that.
To get this working on a tab bar controller please make sure you commit most of the changes that are published on the MGSplitViewController's git page. Good luck.