objective-c - uibutton，放置“目标”和“ Action ”

Question

我有以下代码在UIToolbar(postoInfo)上添加了UIBarButtonItem类型的按钮:

UIImage *faceImage = [UIImage imageNamed:@"informazioni.png"];
UIButton *face = [UIButton buttonWithType:UIButtonTypeCustom];

[face addTarget:self action:@selector(press:) forControlEvents:UIControlEventTouchUpInside];

face.bounds = CGRectMake( 0, 0, 30, 30 );
[face setImage:faceImage forState:UIControlStateNormal];

buttonOne = [[UIBarButtonItem alloc] initWithCustomView:face];

NSArray *buttons = [NSArray arrayWithObjects: buttonOne, nil];

[postoInfo setItems: buttons animated:YES];

我会在按下按钮时调用一个方法，
以下行，但不起作用:

[face addTarget:self action:@selector(press:) forControlEvents:UIControlEventTouchUpInside];

Answer 1

您现在应该为UIButton提供正确的frame属性，因为它具有CGRectZero:

face.frame = CGRectMake( 0, 0, 30, 30 ); 

Cocoa: What's the difference between the frame and the bounds?