ios - UIButton 标签在选择时不尊重先前动画的完成处理程序设置的文本

Question

在 _menuButton 的 touchUpInside 调用中，我执行动画来显示带有完成 block 的菜单，以将菜单的标签从“打开”更改为“关闭”。该动画效果很好，但是当您按下 _menuButton 时，即使用户取消点击或滑出按钮，它也会立即从“关闭”变为“菜单”。按钮标签的初始文本是“菜单”。

不确定这是否有什么不同，但我的 _menuButton 属性是:

@property (weak, nonatomic) IBOutlet UIButton *menuButton;

加载菜单的动画:

    [UIView animateWithDuration:0.50
                     animations:^{
                         [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
                         _menuButton.center = CGPointMake(_menuButton.center.x + 120, _menuButton.center.y);
                         _quitButton.center = CGPointMake(_quitButton.center.x + 215, _quitButton.center.y);
                         _rulesButton.center = CGPointMake(_rulesButton.center.x + 215, _rulesButton.center.y);
                         _preferencesButton.center = CGPointMake(_preferencesButton.center.x + 215, _preferencesButton.center.y);
                         _quitButton.alpha = 1.0f;
                         _rulesButton.alpha = 1.0f;
                         _preferencesButton.alpha = 1.0f;
                         _menuButton.alpha = 1.0f;
                     } completion:^(BOOL finished) {
                         _menuButton.titleLabel.text = @"close";
                     }];

卸载菜单的动画:

    [UIView animateWithDuration:0.50
                     animations:^{
                         [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
                         _menuButton.center = CGPointMake(_menuButton.center.x - 120, _menuButton.center.y);
                         _quitButton.center = CGPointMake(_quitButton.center.x - 215, _quitButton.center.y);
                         _rulesButton.center = CGPointMake(_rulesButton.center.x - 215, _rulesButton.center.y);
                         _preferencesButton.center = CGPointMake(_preferencesButton.center.x - 215, _preferencesButton.center.y);
                         _quitButton.alpha = 0.0f;
                         _rulesButton.alpha = 0.0f;
                         _preferencesButton.alpha = 0.0f;
                         _menuButton.alpha = 0.6f;
                     } completion:^(BOOL finished) {
                         _menuButton.titleLabel.text = @"menu";
                     }];

Answer 1

将 _menuButton.titleLabel.text = @"close"; 更改为

[_menuButton setTitle:@"close" forState:normal];

看 UIButton Class Reference.