iphone - 使用动画修改 imageView 的宽度

Question

我有一个图像“image1”，它是一个 UIButton，我想要的是，如果我触摸这个按钮，图像的宽度乘以二(带动画)而不是高度只是宽度。 抱歉我的英语不好，我是法国人:/

Answer 1

这对于 block 动画来说相当容易。只需尝试一下:

imageView.contentMode = UIViewContentModeScaleAspectFit;

[UIView animateWithDuration:1.0
                       animations:^{ 
                         CGRect newRect = imageView.frame;
                         int movementToTheLeft = imageView.frame.size.width / 2;
                         newRect.size.width *= 2;
                         newRect.origin.x -= movementToTheLeft;
                         imageView.frame = newRect;
                       }
                       completion:^(BOOL finished){

                         [UIView animateWithDuration:1.0
                                          animations:^{ 
                                            NSLog(@"Scaled!");// Anything can go in  this completion block, it should be used for any logic you need after the animation.
                                          } 
                                          completion:^(BOOL finished){
                                            ;
                                          }];

这应该会将 imageView 的宽度缩放 2。希望有帮助!