I have a custom class called NumberView which subclasses UIScrollView. I put a UIView onto my storyboard and changed the class to NumberView:
I then created an outlet to my ShotTraceViewController class:
#interface ShotTraceViewController ()
#property (weak, nonatomic) IBOutlet NumberView *numberView;
#end
I've defined a few methods in the NumberView.h and NumberView.m:
.h:
#interface NumberView : UIScrollView
#property (weak, nonatomic) id<NumberViewDelegate> number_delegate;
-(void)setTotalBtns:(int)total;
...
#end
.m:
#interface NumberView ()
#end
#implementation NumberView {
}
-(instancetype)initWithFrame:(CGRect)frame{
self = [super initWithFrame:frame];
return self;
}
-(instancetype)initWithCoder:(NSCoder *)aDecoder{
self = [super initWithCoder:aDecoder];
return self;
}
-(void)setTotalBtns:(int)total {
NSLog(#"Setting buttons");
}
#end
But when I try to call [self.numberView setTotalBtns:3]; from my ShotTraceViewController. I get an exception:
-[UIView setTotalBtns:]: unrecognized selector sent to instance 0x104fad3e0
Whoa! That's not right, it's supposed to be a NumberView not a UIView! Am I doing something wrong?
I've also noticed that initWithFrame and initWithCoder are both not being called.
I don't know why this worked, but unchecking the Inherit Module from Target button underneath the class selection fixed everything.
Related
I have two text views beside each other with multiple lines of text.
How can I make them both scroll together based on scrolling either one of them at the same time?
First
#interface ViewController : UIViewController <UITextViewDelegate>
second make both textViews delagates
tv1.delegate = self
tv2.delegate = self
Implement
-(void)scrollViewDidScroll:(UIScrollView *)inScrollView {
self.tv1.contentOffset = inScrollView.contentOffset;
self.tv2.contentOffset = inScrollView.contentOffset;
}
Here is a demo txView
Edit
.h
#import <UIKit/UIKit.h>
#interface ViewController : UIViewController <UITextViewDelegate>
#property (weak, nonatomic) IBOutlet UITextView *tv1;
#property (weak, nonatomic) IBOutlet UITextView *tv2;
#end
.m
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.tv1.delegate = self;
self.tv2.delegate = self;
}
- (void)scrollViewDidScroll:(UIScrollView *)inScrollView {
self.tv1.contentOffset = inScrollView.contentOffset;
self.tv2.contentOffset = inScrollView.contentOffset;
}
i have first display start_game screen than after when i click button that time display popupview using xib.in xib class i have create delegate method.when i close the popupview that time call delegate method but not calling
here is my delegate class
.h File
#import
#protocol digbuttonalertdelegate;
#interface digbuttonalert : UIViewController
#property (weak, nonatomic) IBOutlet UIImageView *bg_image;
#property (weak, nonatomic) IBOutlet UILabel *lbl_title;
#property (nonatomic, weak) id<digbuttonalertdelegate> delegate;
#end
#protocol digbuttonalertdelegate <NSObject>
#optional
-(void)digalertclose;
#end
.m File
#import "digbuttonalert.h"
#import "suggestion_alert.h"
#import "UIViewController+CWPopup.h"
#import "zoom_alert.h"
#interface digbuttonalert ()
{
bool status;
}
#end
#implementation digbuttonalert
- (void)viewDidLoad {
[super viewDidLoad];
status=0;
UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(tapDetected)];
singleTap.numberOfTapsRequired = 1;
[self.bg_image setUserInteractionEnabled:YES];
[self.bg_image addGestureRecognizer:singleTap];
// Do any additional setup after loading the view from its nib.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)close:(id)sender {
}
-(void)tapDetected{
NSLog(#"single Tap on imageview");
if(status==0)
{
self.lbl_title.text=#"As you walk you will discover the hidden map.This circle will show your progress.";
status=1;
}
else
{
[self dismissViewControllerAnimated:YES completion:nil];
if ([self.delegate respondsToSelector:#selector(digalertclose)]) {
[self.delegate digalertclose];
}
}
}
here this class i want to call method
#import "digbuttonalert.h"
#interface start_games () <MJSecondPopupDelegate,digbuttonalertdelegate>
{
- (void)viewDidLoad {
digbuttonalert *next=[[digbuttonalert alloc]init];
next.delegate=self;
next.modalTransitionStyle=UIWebPaginationModeRightToLeft;
next.modalPresentationStyle=17;
[self presentViewController:next animated:YES completion:nil];
}
- (void)digalertclose
{
[self StartTimer];
[[NSUserDefaults standardUserDefaults]setObject:#"false" forKey:#"alertstatus"];
}
Change .m file with below :
#protocol digbuttonalertdelegate <NSObject>
#optional
-(void)digalertclose;
#end
#interface digbuttonalert : UIViewController
#property (weak, nonatomic) IBOutlet UIImageView *bg_image;
#property (weak, nonatomic) IBOutlet UILabel *lbl_title;
#property (nonatomic, weak) id<digbuttonalertdelegate> delegate;
#end
And follow basic tutorial steps : enter link description here
Please implement digalertclose delegate in start_games controller like this
-(void)digalertclose {
}
You make digalertclose optional thats why crash does not occur if you remove optional keyword from digbuttonalertdelegate protocol you can see that there will be a crash because you try to fire a delegate but does not implement it.
In your digbuttonalert.h protocol is defined twice.
There is no #end for the interface.
Should be something like
ClassA.h
#protocol YourProtocol <NSObject>
#optional
-(void)yourProtocolOptionalMethod
#end
#interface ClassA.h
#property (weak, nonatomic) id <YourProtocol> delegate;
#end
ClassA.m
-(void) someClassAMethod {
[self.delegate yourProtocolOptionalMethod];
}
ClassB.h
#import "ClassA.h"
#interface ClassB <YourProtocol>
#end
ClassB.m
-(void) someClassBMethod {
ClassA *classA = [ClassA alloc] init];
classA.delegate = self;
}
After setting the delegate now when you will call the delegate from ClassA then it will trigger the protocol implemented method in ClassB
-(void)yourProtocolOptionalMethod {
NSlog(#"");
}
On your class , you need to declare the delegate like this:
#interface YourViewController () < digbuttonalertdelegate >
I need to pass a string from a NSObject class to a UIViewController, I understand that the best way is delegation but the delegate method isn't being called. I'm trying to set the UILabel an DieFacesViewController as the selectedOption from TemporarySelection.
A tableview shows the value of CustomOptionStore, once it's tapped passes its value to TemporarySelection and opens the modal view DieFacesViewCountroller which should, at least in my mind, take the label value from TemporarySelection. The reason I created TemporarySelection is because the DieFacesViewController will be used by other classes, not only by CustomOptionStore, and it will need to load the label from all those classes when different tableViews are selected.
I tried to set the delegate as self in both viewDidLoad and viewWillAppear with no luck, I don't understand if the view loads before being able to call the delegate method or if there's something wrong the way I set the method up.
I've been stuck here for two days, this is the first time I post a question so please forgive me if it's a bit confused.
my delegator class TemporarySelection.h is
#import <Foundation/Foundation.h>
#import "CustomOptionsStore.h"
#class DieFacesViewController;
#protocol TemporarySelectionDelegate <NSObject>
-(void)sendSelection;
#end
#interface TemporarySelection : NSObject
#property (nonatomic, weak) id <TemporarySelectionDelegate> delegate;
#property (nonatomic, strong) NSString *selectedOption;
-(void)addSelection: (CustomOptionsStore *) selection;
#end
and my TemporarySelection.m is
#import "TemporarySelection.h"
#implementation TemporarySelection
-(void)addSelection: (CustomOptionsStore *) selection{
self.selectedOption = selection.description;
[self.delegate sendSelection];
}
#end
the delegate class DiewFacesViewController.h is
#import <UIKit/UIKit.h>
#import "SelectedStore.h"
#import "TemporarySelection.h"
#interface DieFacesViewController : UIViewController <TemporarySelectionDelegate>
#property (strong, nonatomic) IBOutlet UILabel *SelectionName;
#end
and the DieFacesViewController.m is
#import "DieFacesViewController.h"
#interface DieFacesViewController ()
#end
#implementation DieFacesViewController
- (void)viewDidLoad {
TemporarySelection *ts = [[TemporarySelection alloc]init];
ts.delegate = self;
[super viewDidLoad];
}
-(void)sendSelection{
TemporarySelection *ts = [[TemporarySelection alloc]init];
self.SelectionName.text = ts.selectedOption;
}
-(void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:YES];
}
You are not setting the delegate object properly.Check the above code
#import "DieFacesViewController.h"
#interface DieFacesViewController ()<TemporarySelectionDelegate>
{
//global object
TemporarySelection *ts;
}
#end
#implementation DieFacesViewController
- (void)viewDidLoad {
ts = [[TemporarySelection alloc]init];
ts.delegate = self;
[super viewDidLoad];
}
-(void)sendSelection{
//Use the object to extract
self.SelectionName.text = ts.selectedOption;
}
-(void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:YES];
}
I created a custom UIView with the buttons above , this view opens as a pop- up to a viewcontroller . I want the view controller intercepts the pressure of the buttons so I created a protocol methods but delegates in the view controller is never called.
The protocol:
#protocol InsertDelegate <NSObject>
-(void)addNode:(double)x pointY:(double)y radius:(double)r forw:(int)forw;
-(void)cancelView:(UIView*)view;
#end
In the AddNewNode.h
#interface AddNewNode : UIView
#property (assign, nonatomic)id <InsertDelegate> delegate;
- (IBAction)actionCancel:(id)sender;
- (IBAction)actionAdd:(id)sender;
#end
In the AddNewNode.m
- (IBAction)actionCancel:(id)sender { //this action is connect with storyboard
NSLog(#"%#", self.delegate);
//(null)
[self.delegate cancelView:self];
}
- (IBAction)actionAdd:(id)sender { //this action is connect with storyboard
NSLog(#"%#", self.delegate);
//(null)
[self.delegate addNode:x pointY:y radius:r forw:f];
}
In ViewController.h:
#interface ViewController : UIViewController <InsertDelegate>
In ViewController.m
(IBAction)addNewNode:(id)sender {
AddNewNode * addRowView =[[AddNewNode alloc]init];
addRowView.delegate=self;
[self.view addSubview: addRowView];
}
//delegate methods never called
-(void)addNode:(double)x pointY:(double)y radius:(double)r forw:(int)forw{
}
-(void)cancelView:(UIView*)view{
}
In UIView custom self.delegate become null and I don't understand why
What about making an IBOutlet for your
ViewController.h
#interface ViewController : UIViewController <InsertDelegate>
#property (strong, nonatomic) AddNewNode * addNewNode;
//or connect IBOutlet of your `addNewNode`
#property (strong, nonatomic) IBOutlet (addNewNode);
#end
ViewController.m
- (IBAction)addNewNode:(id)sender
{
// you dont need to allocate anymore
self.addRowView.delegate=self;
// and you need to trigger the delegate from `- (IBAction)actionAdd:(id)sender;`
[self.addRowView actionAdd:sender];
}
try the following
Create a private property to hold the instance
#implement AddNewNode()
#propery (nonatomic, strong) AddNewNode * addNewNode;
#end
from inside the button handler
(IBAction)addNewNode:(id)sender {
self.addNewNode =[[AddNewNode alloc]init];
self.addRowView.delegate=self;
}
I have a custom UIButton class like below :
.h
#import <UIKit/UIKit.h>
#class FriendButton;
#protocol LongPressedButtonDelegate
- (void)buttonIsLongPressed:(FriendButton *)button;
#end
#interface FriendButton : UIButton
#property (nonatomic, weak) id<LongPressedButtonDelegate > delegate;
#end
.m
#implementation FriendButton
//this is called from the interface builder
-(id) initWithCoder:(NSCoder *)aDecoder {
self = [super initWithCoder:(NSCoder *)aDecoder];
NSLog(#"init called");
UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:#selector(longPress:)];
[self addGestureRecognizer:longPress];
return self;
}
-(void)longPress:(id)sender {
NSLog(#"long press");
[self.delegate buttonIsLongPressed:self];
}
#end
My buttons are set up in the interface builder, they are contained in a UITableView cell. In my UITableViewController I have :
-(void)buttonIsLongPressed:(FriendButton *)button {
NSLog(#"Delegate method!");
}
and it controller conforms to protocol. The long press gesture works but the delegate method is not being called. I'm not sure why it's not working. Is it because I have to set each buttons delegate to the UITableViewController? If so how would I do that? The buttons are set up in the interface builder.
Define your UIButton property this way
#interface FriendButton : UIButton
#property (nonatomic, weak) IBOutlet id<LongPressedButtonDelegate > delegate;
#end
Then go to Interface Builder and right click on UIButton and you will see delegate link this delegate to UITableViewController. It should work
In your cellForRowAtIndexPath implementation in your UITableViewController you will need to do something like:
cell.button.delegate = self;
Edit: This is if you want to do it programmatically. Refer to the answers around IBOutlets if you want to do it in your storyboard.