Question

我有以下代码,在 UIToolbar (postoInfo) 上添加一个类型 UIBarbutton 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];

I would call a method when the button is pressed, I added, the following line, but does not work:

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

Answer 1

您应该为 UIButton 提供正确的框架属性, 现在它有 CGRect Zero :

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

Cocoa:框架和界限之间有什么区别?

Answer 2

我首先想到的是您正在设置 UI 按钮的动作, 但是您正在以 UI 按钮的视图来初始化 UI BarButtonTroup 。该动作没有保存在视图中。您尝试为 UI BarButton Text 设定动作。

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