Why my iPhone app cannot call the delegate method - iphone

Question

I'm developing the iPhone app. I custom defined the titleview for navigation bar. The title view contains a button, I also defined the delegate method to support the button click event. But when the button clicked, the delegate cannot be executed. I am not sure why ?
Below as my codes:
UPDelegate.h
#protocol UPDelegate <NSObject>
#optional
-(void)buttonClick;
#end
TitleView.h
#import <UIKit/UIKit.h>
#import "UPDelegate.h"
#interface TitleView :UIView
#property (nonatomic, unsafe_unretained) id<UPDelegate> delegate;
-(id)initWithCustomTitleView;
#end
TitleView.m
#synthesize delegate;
-(id)initWithCustomTitleView
{
self = [super init];
if (self) {
UIButton *titleButton = [UIButton buttonWithType:UIBUttonTypeCustom];
titleButton.frame = CGRectMake(0, 0, 20, 44);
[titleButton setTitle:#"ABC" forState:UIControlStateNormal];
// add action
[titleButton addTarget:delegate action:#selector(buttonClick) forControlEvents:UIControlEventTouchUpInside];
[self addSubview:titleButton];
}
return self;
}
In my ViewController, i implement the protocal as below:
MyViewController.h
#interface MyViewController : UIViewController<UPDelegate>
and in the .m file, i wrote the delegate method, but cannot be exeucte.
MyViewController.m
-(void)buttonClick{
NSLog("click title button");
}

Answer 1

You have to set your delegate, from you code sample you are creating id<UPDelegate> delegate; in your titleView class.
So in your MyViewController where you have added <UPDelegate>, create an instance of TitleView and set delegate to self.
So in your MyViewController use:
TitleView*titleView=[[TitleView alloc]init];
titleView.delegate=self;

Answer 2

It sounds like you have not set the value of your titleView's delegate property, so any messages sent to the delegate property are ignored because the delegate is nil.
You should make sure that you are setting your titleView's delegate to be your MyViewController. The best place to do this is most likely in your MyViewController's viewDidLoad: method.

Answer 3

Did you set the delegate anywhere? Because you have to set the delegate of your TitleView to MyViewController:
titleView.delegate = self;