自定义动画navigationItem [英] Custom navigationItem animation

问题描述

我要上leftBarButtonItem自定义动画：

 的UIBarButtonItem *菜单按钮= [[的UIBarButtonItem页头]
                               initWithTitle：@菜单
                               风格：UIBarButtonItemStyleBordered
                               目标：自我
                               动作：@selector（onMenuButtonTouch）];
viewController.navigationItem.leftBarButtonItem =菜单按钮;
 

我的UINavigationController推动和持久性有机污染物的观点与自定义动画所以leftBarButtonItem没有目前的动画。

  [self.navigationController pushViewController：myViewController动画：NO];
[UIView的animateWithDuration：...
 

-

首先，我更改的属性，如果它是动画，但没有工作的看到。然后我试图动画开始前设置的属性，但没有任何工作。这需要绝对没有影响。

有没有办法动画这样的事情，例如？

  self.navigationController.navigationItem.leftBarButtonItem.width = 10;
 

或

  self.navigationController.navigationItem.leftBarButtonItem.customView.alpha = 0;
 

解决方案

的UIBarButtonItem 是不是一个子类的UIView 所以你不能对他们，但 customView 是的UIView 对象，这样你就可以制作动画。

  [UIView的animateWithDuration：1.0
                 动画：^ {
                     self.navigationItem.rightBarButtonItem.customView.alpha = 0;
                 }];
 

I want a custom animation on the leftBarButtonItem:

 UIBarButtonItem *menuButton = [[UIBarButtonItem alloc]
                               initWithTitle:@"Menu" 
                               style:UIBarButtonItemStyleBordered 
                               target:self 
                               action:@selector(onMenuButtonTouch)];
viewController.navigationItem.leftBarButtonItem = menuButton;

My UINavigationController pushes and pops views with a custom animation so the leftBarButtonItem doesn't have any animations at the moment.

[self.navigationController pushViewController:myViewController animated:NO];
[UIView animateWithDuration:...

-

First I changed a property the see if it is animated but that didn't work. Then I tried to set the property before the animation starts but that didn't work either. It takes absolutely no effect.

Is there a way to animate something like this for example?

self.navigationController.navigationItem.leftBarButtonItem.width = 10;

or

self.navigationController.navigationItem.leftBarButtonItem.customView.alpha = 0;

解决方案

UIBarButtonItems are not a subclass of UIView so you can't apply animations on them but customView is a UIView object so you can animate it.

[UIView animateWithDuration:1.0
                 animations:^{
                     self.navigationItem.rightBarButtonItem.customView.alpha = 0;
                 }];

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