SubClassing UIButton但我不能让“addTarget：action：forControlEvents：”执行？

Question

I have subclassed UIButton to draw graphics, but the "addTarget" won't work.

- (void)addTarget:(id)target action:(SEL)action forControlEvents:(UIControlEvents)controlEvents

I did not do anything with making adjustments to that method.

The Button graphics work ok on the "touches".

If I use a standard UIButton then the "addTarget" works fine.

Not sure what I am missing??

thx

#import <UIKit/UIKit.h>

@interface CButton : UIButton
{
    CGContextRef c;
    int myState;
}
@end

---

#import "CButton.h"

@implementation CButton

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
    }
    //NSLog(@"init state: %d", self.state);
    return self;
}


- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
  //  myState = 1;
    myState = !myState;
   // NSLog(@"BeginState: %d", self.state);

    [self setNeedsDisplay];
}


- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
  //  myState = 0;
  //  NSLog(@"EndState: %d", self.state);
  //  [self setNeedsDisplay];

}

- (void)drawRect:(CGRect)rect
{
    // Drawing code

}
@end

Answer 1

You have to call super from your event handlers when you're all done handling events. How else will the button know of the touches to call your action?

eg

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
  //  myState = 1;
    myState = !myState;
   // NSLog(@"BeginState: %d", self.state);

    [self setNeedsDisplay];

    [super touchesBegan:touches withEvent:event]; // you need this
}

That being said, the comments on your original post are right, subclassing UIButton can get tricky. But it looks as if you have things under control (mostly). Good luck!