Question

我有以下代码在UIToolbar（postoInfo）上添加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];

按下按钮时我会调用一个方法，我补充说，以下行，但不起作用：

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

Answer 1

你应该为UIButton提供正确的框架属性，现在它有CGRectZero：

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

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

Answer 2

我想到的第一件事是你正在为UIButton设置动作，但是你正在用UIButton的视图初始化UIBarButtonItem。该操作未保存在视图中。您尝试为UIBarButtonItem设置操作。

uibutton，把“目标”和“行动”

2 个答案: