如何淡入的UIButton [英] How Fade in UIButton

问题描述

我怎么能在一个UIButton淡入视图？

how can I fade in a UIButton in a view?

现在我添加：

    [myView addSubview:myButton];

但如果我要淡出呢？

but if I want to fade it?

[UIView animateWithDuration:3.0
delay:0.0
options: UIViewAnimationCurveEaseInOut
animations:^{myButton.alpha = 1.0}
completion:^(BOOL finished){ [myView addSubview:myButton]; }];

谢谢！

推荐答案

尝试使用

myButton.alpha = 0.0;
[myView addSubview:myButton];

之前的动画调用。

prior to the animation call.

[UIView animateWithDuration:3.0
                      delay:0.0
                    options: UIViewAnimationCurveEaseInOut
                 animations:^{myButton.alpha = 1.0;}
                 completion:nil];

如果您褪色它在和添加，以查看，部分衰落不会视图的边界内（将屏幕外）。因此，首先将其添加在零阿尔法，然后消失它

If you fade it in and add to view, the fading in part will not be within the bounds of the view (will be offscreen). So add it first at zero alpha and then fade it in.

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