iphone - 如何在单个 animateWithDuration 调用期间缩放和旋转

Question

我正在UIView使用以下代码制作动画。这很好用，但我如何让它同时动画比例，我希望它在旋转时缩小到 0。

[UIView animateWithDuration:0.4 delay:0.0 options:UIViewAnimationOptionCurveEaseInOut
                 animations:^(void) {
                     recognizer.view.transform = CGAffineTransformMakeRotation(DegreesToRadians(540));
                     recognizer.view.backgroundColor = [[UIColor alloc] initWithRed:220.0/255.0 green:220.0/255.0 blue:220.0/255.0 alpha:1.0];   
                 }];

Answer 1

只需使用CGAffineTransformConcat方法。尝试：

[UIView animateWithDuration:0.4 delay:0.0 options:UIViewAnimationOptionCurveEaseInOut
                 animations:^(void) {
                     recognizer.view.transform = CGAffineTransformConcat(CGAffineTransformMakeRotation(DegreesToRadians(540)), CGAffineTransformMakeScale(1.0, 1.0));
                     recognizer.view.backgroundColor = [[UIColor alloc] initWithRed:220.0/255.0 green:220.0/255.0 blue:220.0/255.0 alpha:1.0];   
                 }];

希望有帮助！