UIButton's addtarget: not called after touch it!

I have the following code, and when i press the UIButton,开发者_如何学运维 nothing is called, and it doesn't crash.

    calloutButton = [[UIView alloc] initWithFrame:CGRectMake(left_width2*2-3, 5, 230, 230)];
    UIButton *buttongo= [UIButton buttonWithType:UIButtonTypeDetailDisclosure];

    buttongo.frame=CGRectMake(0, -1, 25, 25);
    [buttongo addTarget:self action:@selector(buttonEvent:) forControlEvents:UIControlEventTouchUpInside];
    [calloutButton addSubview:buttongo];

    [label addSubview:calloutButton];




    -(IBAction)buttonEvent:(id)sender 
    {
          NSLog(@"Hello...");
    }

Someone Knows why?

Thanks!

---

Check the size of the label, it can be CGSizeZero, but because the clipping of subviews is NO by default so the button is visible, but it isn't touchable.

---

Make sure you not have

@property IBOutlet UIButton *yourButton;

with same name with

@implementation {
    UIButton *_yourButton;
}

I had such problem