I'm adding a UIViewController which has only an UILabel to the main UIView. I create it like this:
WEPopoverLabel *contentViewController = [[WEPopoverLabel alloc] init];
[contentViewController setContents:#"aaa"];
(The hole code .m):
if (!self.popoverController) {
WEPopoverLabel *contentViewController = [[WEPopoverLabel alloc] init];
[contentViewController setContents:#"aaa"];
contentViewController.lContent.text=#"aaarrr";
self.popoverController = [[[popoverClass alloc] initWithContentViewController:contentViewController] autorelease];
self.popoverController.delegate = self;
self.popoverController.popoverContentSize = CGSizeMake(50.0f, 20.0f);
self.popoverController.passthroughViews = [NSArray arrayWithObject:sender];
CGRect rectForPopover = [self.view convertRect:sender.bounds fromView:sender];
[self.popoverController presentPopoverFromRect:rectForPopover inView:self.view permittedArrowDirections:(UIPopoverArrowDirectionUp|UIPopoverArrowDirectionDown) animated:YES];
[contentViewController release];
}
Well, WEPopoverLabel is being created because it shows up in my window and also executes setContents because I've got a NSLog which is printing in my console.
However, the label is not being changed. This is the content of WEPopoverLabel:
#interface WEPopoverLabel : UIViewController{
IBOutlet UILabel * lContent;
}
-(void)setContents:(NSString *) theContent;
and .m
#implementation WEPopoverLabel
-(void)setContents:(NSString *) theContent{
lContent.text = theContent;
NSLog(#"texto fijado");
}
In the .xib, I've connected the lContent to File's owner.
Why is not being updated the text of UILabel?
In the UIViewController, have you connected the main view in the xib to the file owner as well as connecting the label?
Also have you added WEPopoverLabel to the view after it is created:
[currentView addSubview:contentViewControler]
I would give the label a background colour so you can tell if it is actually beng displayed.
-(void)setContents:(NSString *) theContent{
lContent = [[UILabel alloc] init]
lContent.text = theContent;
NSLog(#"texto fijado");
}
thats correct. check this:
http://forums.macrumors.com/showthread.php?t=1002736
Or
#property (nonatomic, retain) IBOutlet UILabel *lContent;
and in this method:
self.lContent.text = theContent
Related
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
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..
Background: I have a UIViewController that, when loads, has a UITableView generated programmatically that gets its data from an SQLite3 database. This works fine.
Problem: I need to add a UISearchBar (and associated logic) but when I try, the UISearcBar is not rendered.
Code so far:
.h file:
#import <UIKit/UIKit.h>
#import "sqlite3.h"
#import "Exhibitor.h"
#interface ExhibitorViewController : UIViewController <UITableViewDataSource, UITableViewDelegate, UISearchBarDelegate, UISearchDisplayDelegate>
{
sqlite3 *congressDB;
NSMutableArray *searchData;
UISearchBar *searchBar;
UISearchDisplayController *searchDisplayController;
}
#property (strong, nonatomic) IBOutlet UITableView *tableView;
-(NSString *) filePath;
-(void)openDB;
#end
.m file where the UISearchBar is added:
-(void)loadTableView
{
CGRect usableSpace = [[UIScreen mainScreen] applicationFrame];
CGFloat usableWidth = usableSpace.size.width;
CGFloat usableHeight = usableSpace.size.height;
UITableView *tableView = [[UITableView alloc] init];
[tableView setFrame:CGRectMake(0,0,usableWidth, usableHeight)];
tableView.dataSource = self;
tableView.delegate = self;
[self.view addSubview:tableView];
searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0, 0, 320, 64)];
searchDisplayController = [[UISearchDisplayController alloc] initWithSearchBar:searchBar contentsController:self];
searchDisplayController.delegate = self;
searchDisplayController.searchResultsDataSource = self;
self.tableView.tableHeaderView = searchBar; // I think this should have loaded the searchBar but doesn't
// [self.tableView setTableHeaderView:searchBar]; // Have also tried this
// [self.tableView.tableHeaderView addSubview:searchBar]; // And this
NSLog(#"searchBar = %#", searchBar); // This shows the searchBar is an object with values
NSLog(#"HeaderView = %#", self.tableView.tableHeaderView); // This shows the tableHeaderView as null ??
}
What am I doing wrong? What do I need to do to add a UISearchBar programmatically to a UITableView within a UIVewController?
You should use a UITableViewController instead...
.h
#interface ExhibitorViewController : UITableViewController <UISearchBarDelegate, UISearchDisplayDelegate> {
sqlite3 *congressDB;
NSMutableArray *searchData;
UISearchBar *searchBar;
UISearchDisplayController *searchDisplayController;
}
-(NSString *) filePath;
-(void)openDB;
#end
.m
-(void)loadTableView {
searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0, 0, 320, 64)];
searchDisplayController = [[UISearchDisplayController alloc] initWithSearchBar:searchBar contentsController:self];
searchDisplayController.delegate = self;
searchDisplayController.searchResultsDataSource = self;
self.tableView.tableHeaderView = searchBar;
}
The problem is you were creating a table view but not assigning it to the property, and using UITableViewController makes things much simpler anyway...
If you want to keep it the way it is now, then you could just put self.tableView = tableVew; after [self.view addSubview:tableView];...
The problem is that
self.tableView
in loadTableView is nil or it is not that table that you have created programmatically.
Add
self.tableView = tableView;
after
[self.view addSubview:tableView];
Without this your searchBar is added to invalid tableView.
should
I want to add my custom UIView to my main view.
I want to use the function initWithTitle:description: like:
AchievementView *achievement = [[AchievementView alloc] initWithTitle:#"Test" description:#"The Descr"]];
But this doesn't work. tThe initWithTitle:description: function have to be implemented as class method.
AchievementView.h
#interface AchievementView : UIView
#property (strong) NSString *achievementTtl;
#property (strong) NSString *achievementDescr;
#property (strong) UIView *theAchievementView;
- (void)initWithTitle:(NSString*)achievementTitle description:(NSString*)achievementDescription;
- (void)showAchievement;
#end
AchievementView.m
-(void)initWithTitle:(NSString*)achievementTitle description:(NSString*)achievementDescription {
self.achievementTtl = achievementTitle;
self.achievementDescr = achievementDescription;
}
- (void)showAchievement {
// Create view popup
self.theAchievementView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 300, 423)];
self.theAchievementView.layer.cornerRadius = 8;
self.theAchievementView.layer.masksToBounds = YES;
self.theAchievementView.layer.shadowRadius = 5;
self.theAchievementView.layer.shadowOpacity = .15;
[self.theAchievementView setBackgroundColor:[UIColor whiteColor]];
[self addSubview:self.theAchievementView];
}
Call the method in main view:
- (IBAction)share:(id)sender {
AchievementView *achievement = [[AchievementView alloc] init];
achievement.achievementTtl = #"Test";
achievement.achievementDescr = #"TestDEscr";
[achievement showAchievement];
}
I can't add the subview to the main view with this function.
I think the "self" is wrong. What should be there?
[self addSubview:self.theAchievementView];
You have 2 questions: how to initialize the view and how to add it to the screen.
You can use the initWithTitle:description: method, you just have to use it on an instance of the class, not the class itself:
[[AchievementView alloc] initWithTitle:#"Test" description:#"The Descr"]];
You are correct that you have the wrong self in your addSubview call. You need a reference to the parent view. You could pass it into your AchievementView class, but it is cleaner to manage that outside of the class.
I also noticed that AchievementView is a subclass of UIView, but you are creating another UIView inside it. It would be simpler to directly use the AchievementView. Your code should be similar to the below:
AchievementView.h
#interface AchievementView : UIView
#property (strong) NSString *achievementTtl;
#property (strong) NSString *achievementDescr;
- (id)initWithTitle:(NSString*)achievementTitle description:(NSString*)achievementDescription;
#end
AchievementView.m
- (id)initWithTitle:(NSString*)achievementTitle description:(NSString*)achievementDescription {
if (self = [super initWithFrame:CGRectMake(0, 0, 300, 423)]) {
self.achievementTtl = achievementTitle;
self.achievementDescr = achievementDescription;
self.layer.cornerRadius = 8;
self.layer.masksToBounds = YES;
self.layer.shadowRadius = 5;
self.layer.shadowOpacity = .15;
self.backgroundColor = [UIColor whiteColor];
}
return self;
}
Main view
- (IBAction)share:(id)sender {
AchievementView *achievement = [[AchievementView alloc] initWithTitle:#"Test" description:#"TestDEscr"];
[self.view addSubview:achievement];
}
Number one, you are never adding achievement as a subview of your main view. Basically you are creating a view offscreen, adding a view to that view, then moving on with whatever you want to do without ever moving the first view onto the screen.
As a minimum you should do this:
- (IBAction)share:(id)sender {
AchievementView *achievement = [[AchievementView alloc] init];
achievement.achievementTtl = #"Test";
achievement.achievementDescr = #"TestDEscr";
[achievement showAchievement];
[self addSubview:achievement];
}
Along with setting the frame size of achievement which is currently never set (and since most views by default mask to their layer bounds it will mask to (0,0,0,0)).
Then I would seriously reconsider how you are dealing with views and subviews. If you do things properly, your initwithtitle will work just fine.
I am creating some custom UIBarButtonItems for my bottom toolbar with the following method:
- (void)initialisePageNoProperties
{
pageNoTextField = [[UITextField alloc] initWithFrame:CGRectMake(0, 0, 50, 30)];
[pageNoTextField setDelegate:self];
pageNoTextField.text = #"0";
pageNoTextField.textColor = [UIColor blackColor];
pageNoTextField.backgroundColor = [UIColor whiteColor];
pageNoTextField.textAlignment = UITextAlignmentRight;
pageNoTextField.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
pageNoTextField.borderStyle = UITextBorderStyleRoundedRect;
pageNoTextField.autocorrectionType = UITextAutocorrectionTypeNo; // no auto correction support
pageNoTextField.keyboardType = UIKeyboardTypeNumberPad;
pageNoTextField.returnKeyType = UIReturnKeyGo;
[pageNoTextField setClearsOnBeginEditing:YES];
pageNoBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:pageNoTextField];
pageNoBarButtonItem.style = UIBarButtonItemStyleBordered;
noOfPagesTextField = [[UITextField alloc] initWithFrame:CGRectMake(0, 0, 50, 30)];
noOfPagesTextField.text = #"0";
noOfPagesTextField.textColor = [UIColor blackColor];
noOfPagesTextField.backgroundColor = [UIColor clearColor];
noOfPagesTextField.textAlignment = UITextAlignmentLeft;
noOfPagesTextField.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
noOfPagesTextField.enabled = NO;
noOfPagesBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:noOfPagesTextField];
}
These buttons then get added to the bottom toolbar with the following method:
- (void)configurePageNoDisplay
{
if(![self.navigationController isToolbarHidden])
{
NSMutableArray *items = [[self.navigationController.toolbar items] mutableCopy];
bool insertIntoArray = ([items count] == 10); // without the page number display the items array will contain 10 items
if (insertIntoArray)
{
[items insertObject:pageNoBarButtonItem atIndex:3];
}
else
{
[items replaceObjectAtIndex:3 withObject:pageNoBarButtonItem];
}
if (insertIntoArray)
{
[items insertObject:noOfPagesBarButtonItem atIndex:4];
}
else
{
[items replaceObjectAtIndex:4 withObject:noOfPagesBarButtonItem];
}
[self.navigationController.toolbar setItems:items];
[self SetPageNoDisplay:[pdfViewCtrl GetCurrentPage]];
}
}
and the values for these buttons get set as follows:
- (void)SetPageNoDisplay:(NSInteger) pageNumber
{
pageNoTextField.text = [NSString stringWithFormat:#"%d", pageNumber];
noOfPagesTextField.text = [NSString stringWithFormat:#"of %d", [[pdfViewCtrl GetDoc] GetPageCount]];
}
The buttons and the fields they contain are declared as follows:
#property (strong, nonatomic) IBOutlet UIBarButtonItem *pageNoBarButtonItem;
#property (strong, nonatomic) IBOutlet UIBarButtonItem *noOfPagesBarButtonItem;
#property (strong, nonatomic) IBOutlet UITextField *pageNoTextField;
#property (strong, nonatomic) IBOutlet UITextField *noOfPagesTextField;
Originally they were not declared as IBOutlets - but I read a suggestion that doing so would help my problem - unfortunately it did not help.
I hide/show the bottom toolbar in response to a double tap from the user:
- (void)handleDoubleTap:(UITapGestureRecognizer *)gestureRecognizer
{
[self.navigationController setNavigationBarHidden:![self.navigationController isNavigationBarHidden] animated:true];
[self.navigationController setToolbarHidden:![self.navigationController isToolbarHidden] animated:true];
[self configurePageNoDisplay];
//[sideBarTab setHidden:![sideBarTab isHidden]];
}
The problem I have is that once the toolbar has been hidden - the buttons do not appear again when it is re-shown. If I rotate the iPad after re-showing the toolbar then the buttons appear again.
I ended up resolving this issue by taking a different approach. I used a standard UIToolbar, rather than the navigation controller toolbar. Using Interface Builder I was able to add a plain UIView to the toolbar and then add the 2 UITextFields inside the UIView. This way I did not have to worry about all the code to add the text fields to the toolbar inside of bar button items - or calling the code to reinstate the text fields on orientation change, hiding and showing of the toolbar etc. It ended up being a much simpler and more robust approach.
Use the setToolbarItems method in your UIViewController to set the toolbar buttons and that should solve it.