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HTML5 发布时间：2022-04-27 发布网站：大佬教程 code.js-code.com

大佬教程收集整理的这篇文章主要介绍了iPhone / iPad – 核心动画 – CGAffineTransformMakeTranslation不会修改框架，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。

我面临一个非常烦人的问题.
这是上下文：我有一个“矩形”视图,它是主视图的子视图.
我想要做的很简单,当我点击一个按钮时,我希望“矩形”视图在x轴上平移以便消失.然后我添加一个新的子视图并进行翻译,以取代之前的“矩形”视图.
它的工作正常,但是如果我再次按下按钮,动画将从屏幕开始,就像CGAffineTransformMakeTranslation没有改变我的新“矩形”视图的框架一样.
这是代码：

UIView *rectangleView = [detailView viewWithTag:4]; //the actual frame is (20.0,30.0,884.0,600.0)

[UIView animateWithDuration:0.5 animations:^{
    [rectangleView setTransform:CGAffineTransformMakeTranslation(-1000,0)];
} completion:^(BOOL finished) {
    [rectangleView removeFromSuperview];
    UIView *otherView = [[UIView alloc] initWithFrame:CGRectMake(1020.0,600.0)];
    [otherView setBACkgroundColor:[UIColor purpleColor]];
    [otherView setTag:4];
    [detailView addSubview:otherView];
    [UIView animateWithDuration:0.5 animations:^{
        [otherView setTransform:CGAffineTransformMakeTranslation(-1000,0)];
    } completion:^(BOOL finished) {
        [otherView release];
    }];
}];

解决方法

添加第二个视图后,您已将其变换设置为等于CGAffineTransformMakeTranslation(-1000,0),并且当您想要删除该视图时,您将设置完全相同的变换 – 因此它将无效.这里有2个选项：

>将转换应用于视图已有的转换：

CGAffineTransform newTransform = CGAffineTransformConcat(rectangleView.transform,CGAffineTransformMakeTranslation(-1000,0));
[rectangleView setTransform:newTransform];

>而不是应用变换直接操作视图位置(例如通过其中心属性)

UIView *rectangleView = [detailView viewWithTag:4]; //the actual frame is (20.0,600.0)
CGAffineTransform tf = CGAffineTransformMakeTranslation(-1000,0);
[UIView animateWithDuration:0.5 animations:^{
    [rectangleView setCenter: CGPointApplyAffineTransform(rectangleView.center,tf)];
} completion:^(BOOL finished) {
    [rectangleView removeFromSuperview];
    UIView *otherView = [[UIView alloc] initWithFrame:CGRectMake(1020.0,600.0)];
    [otherView setBACkgroundColor:[UIColor purpleColor]];
    [otherView setTag:4];
    [detailView addSubview:otherView];
    [UIView animateWithDuration:0.5 animations:^{
        [otherView setCenter: CGPointApplyAffineTransform(otherView.center,tf)];
    } completion:^(BOOL finished) {
        [otherView release];
    }];
}];