【iOS】图片缩放动画

+ transitionWithView:duration:options:animations:completion:

[UIView animateWithDuration:kAnimationDuration
animations:^{
_imageView.transform = CGAffineTransformMakeScale(1.2, 1.2); //宽高渐变
_imageView.alpha = 0.f; //设置透明度渐变
} completion:^(BOOL finished) {
//完成后的一些操作
}];