如何“可选化”基于块的 UIView 动画？

发布于 2024-11-01 11:11:16 字数 551 浏览 3 评论 0原文

我的自定义控件有一个方法 -setValue:animated:，它采用 animated 标志。

在 iOS 4 之前，我会这样编写动画：

if (animated) {
    [UIView beginAnimations:@"Foo"];
    [UIView setAnimationDuration:5.0];
}
// ... layout views ...
if (animated) {
    [UIView commitAnimations];
}

现在我这样写：

[UIView animateWithDuration:(animated ? 5.0 : 0.0) animations:^{
    // ... layout views ...
}];

但是： 这会导致某些元素没有动画！

我多次调用此方法（第一次没有动画，第二次有动画），因此第二次动画被取消，将我的新帧设置为“硬”（没有动画）。

如何用块方法实现可选动画？

原文

My custom control has a method -setValue:animated:, which takes an animated flag.

Before iOS 4, I would have written the animation thus:

if (animated) {
    [UIView beginAnimations:@"Foo"];
    [UIView setAnimationDuration:5.0];
}
// ... layout views ...
if (animated) {
    [UIView commitAnimations];
}

Now I wrote this:

[UIView animateWithDuration:(animated ? 5.0 : 0.0) animations:^{
    // ... layout views ...
}];

BUT: this leads to some elements not animating!

I call this method more than just once (first time without, second time with animation), so the second time round the animation is cancelled, setting my new frame "hard" (without animation).

How to implement optional animation with the blocks approach?

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﹉夏雨初晴づ 2024-11-08 11:11:16

您可以在块中定义要进行的所有更改。然后，如果您想要动画更改，则可以将块提供给 UIView animate...，或者直接执行它以进行不带动画的更改。

void (^myViewChanges)(void) = ^() {
    myView.alpha = 0.5;
    // other changes you want to make to animatable properties
};

if (animated) {
    [UIView animateWithDuration:5.0f animations:myViewChanges];
} else {
    myViewChanges();
}

You can define all of the changes you want to make in a block. You then either feed the block to UIView animate... if you want the changes animated, or execute it directly to make the changes without animation.

void (^myViewChanges)(void) = ^() {
    myView.alpha = 0.5;
    // other changes you want to make to animatable properties
};

if (animated) {
    [UIView animateWithDuration:5.0f animations:myViewChanges];
} else {
    myViewChanges();
}

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