View的缩放操作--CGAffineTransformMakeScale:

__weak UIImageView *weekImage = imageView;

imageView.transform = CGAffineTransformMakeScale(0.1, 0.1);//x y方向的初始缩放比例；

[UIViewanimateWithDuration:.3animations:^{

weekImage.transform = CGAffineTransformMakeScale(1, 1);

} completion:^(BOOL finished) {

weekImage.transform = CGAffineTransformIdentity;//

}];

CGAffineTransformMakeTranslation : 每次都是以最初位置的中心点为参考

CGAffineTransformTranslate 每次都是以传入的transform为参照（既 有叠加效果）

CGAffineTransformIdentity  最初位置的中心点

// 不停的按 也只会动一次
- (IBAction)btn1Action:(id)sender {
self.imageView.transform=CGAffineTransformMakeTranslation(0,50);
}

// 不停的按 不停的动
- (IBAction)action2:(id)sender {

// self.imageView.transform = CGAffineTransformTranslate(CGAffineTransformIdentity, 0, 50);
self.imageView.transform =CGAffineTransformTranslate(self.imageView.transform, 0, 50);

}