使用 Quartz 2D 的仿射变换序列

Question

我正在尝试使用 iOS 中的 UIAlertView 在 OS X 中模拟不正确的密码输入动画。本质上，我希望它向左翻译警报，然后向右翻译。这是我正在做的事情：

    [UIView animateWithDuration:0.5 
                 animations:^{
                     alertView.transform = CGAffineTransformTranslate(CGAffineTransformIdentity, 200, 0);
                     alertView.transform = CGAffineTransformTranslate(CGAffineTransformIdentity, -200, 0);
                 }];

然而，这并没有达到预期的效果。警报瞬间向右射击，然后平稳地向左平移。我怎样才能让两个翻译顺利进行？

Answer 1

试试这个：

[UIView animateWithDuration:0.5 animations:^{

        alertView.transform = CGAffineTransformTranslate(CGAffineTransformIdentity, 200, 0);

    } completion:^(BOOL finished) {

        [UIView animateWithDuration:0.5 animations:^{
            alertView.transform = CGAffineTransformTranslate(CGAffineTransformIdentity, -200, 0);
        }];
    }];

但我会做这样的动画：

[UIView animateWithDuration:0.1 animations:^{

        alertView.transform = CGAffineTransformTranslate(CGAffineTransformIdentity, 20, 0);

    } completion:^(BOOL finished) {

        [UIView animateWithDuration:0.1 animations:^{

            alertView.transform = CGAffineTransformTranslate(CGAffineTransformIdentity, -20, 0);

        } completion:^(BOOL finished) {

            [UIView animateWithDuration:0.1 animations:^{
                alertView.transform = CGAffineTransformTranslate(CGAffineTransformIdentity, 0, 0);
            }];

        }];
    }];

由你决定！ ;-)