使用initWithCustomView创建的UIBarButtonItem不会触发操作

Question

我正在更新一些旧代码,并在工具栏中腾出更多空间,我正在将按钮从测试转换为图像.loadView中新旧代码的示例如下:

// New code, doesn't work.
UIButton *toggleKeyboardBtn = [UIButton buttonWithType:UIButtonTypeCustom];
toggleKeyboardBtn.bounds = CGRectMake( 0, 0, showKeyboardImage.size.width, showKeyboardImage.size.height );
[toggleKeyboardBtn setImage:showKeyboardImage forState:UIControlStateNormal];
UIBarButtonItem *toggleKeyboardItem = [[UIBarButtonItem alloc] initWithCustomView:toggleKeyboardBtn];
[toggleKeyboardItem setTarget:self];
[toggleKeyboardItem setAction:@selector(toggleKeyboard:)];

// Original code, works jut fine.
UIBarButtonItem *setupItem = [[[UIBarButtonItem alloc] initWithTitle:@"Setup" style:UIBarButtonItemStyleBordered target:[UIApplication sharedApplication].delegate action:@selector(showSetupView:)] autorelease];

我的新代码是从无法在UIBarButtonItem上设置动作复制的,而且我很确定我没有犯错,因为我的文本按钮工作得很好.

showSetupView()在我的AppController.m文件中,当按下按钮时,设置屏幕出现并消失.

toggleKeyboard(),OTOH,与loadView()例程在同一个文件中,目前包含以下代码:

//- (void)toggleKeyboard {
- (IBAction)toggleKeyboard:(id)sender {
    NSLog(@"Entering toggleKeyboard()...");
    hiddenKeyboard = !hiddenKeyboard;
    [self prepareToolbarsAndStatusbar];
}

不用说,虽然我看到按钮动画,但我从未看到过NSLog消息.最后一次观察是偶然发现的.将setAction选择器更改为:

[toggleKeyboardItem setAction:@selector(noSuchRoutine:)];

干净地编译,可能表示我的例行名称由于某种原因被忽略.

有人有主意吗？谢谢.

Answer 1

我找到了答案!在没有响应iphone的按钮动作中,它表示动作和目标需要设置在UIButton,而不是UIBarButtonItem.我不知道Xcode的最新版本是否是新版本,但我想是因为其他问题(例如我上面提到的问题)使用了不同的技术.这是我的新代码:

UIButton *toggleKeyboardButton = [UIButton buttonWithType:UIButtonTypeCustom];
toggleKeyboardButton.bounds = CGRectMake( 0, 0, keyboardAddImage.size.width, keyboardAddImage.size.height );
[toggleKeyboardButton setImage:keyboardAddImage forState:UIControlStateNormal];
[toggleKeyboardButton addTarget:self action:@selector(toggleKeyboard) forControlEvents:UIControlEventTouchUpInside];

UIBarButtonItem *toggleKeyboardItem = [[UIBarButtonItem alloc] initWithCustomView:toggleKeyboardButton];
//[toggleKeyboardItem setTarget:self];
//[toggleKeyboardItem setAction:@selector(toggleKeyboard:)];