Question

I’m completely stuck with calling a method from a UIView subclass, the method just doesn’t get fired, I have a feeling that I’m doing something wrong but after searching the web I did not find any clue. Thank you in advance

Here’s the iPadMainViewController.h file

#import <UIKit/UIKit.h>
#import "TouchView.h"

@interface iPadMainViewController : UIViewController <TouchViewDelegate> 

@property (retain) UIWebView *detailsView;

@end

and the iPadMainViewController.h file that holds the method

- (void)MethodNameToCallBack:(NSString *)s
{
    NSLog(@"%@",s);
}

Here’s the TouchView.h file, which is supposed t

@protocol TouchViewDelegate
- (void)MethodNameToCallBack:(NSString *)s;
@end

@interface TouchView : UIView {
    id<TouchViewDelegate> delegate;
}

@property (nonatomic, assign) id delegate;

@end

Here’s the TouchView.m file which is supposed to call a method of it’s delegate

@implementation TouchView
@synthesize delegate;


-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    NSLog(@"HELLO FROM INSIDE");

    [[self delegate] MethodNameToCallBack:(NSString *)@"HELLO FROM OUTSIDE"];
}

@end

Answer 1

Synthesizing the delegate is not enough, because it just creates the getter and the setter methods. It does not create an instance of iPadMainViewController.

So after you create an instance of TouchView, you should assign an instance of iPadMainViewController as the delegate.

iPadMainViewController *controller = [[iPadMainViewController alloc] init...
// ...
TouchView *touchView = [[TouchView alloc] init...
// ...
touchView.delegate = controller;

Or in the iPadMainViewController’s viewDidLoad method:

- (void)viewDidLoad
{
    // ...
    self.touchView.delegate = self;
}