iOS 启动页放大淡出效果

//屏幕宽度
#define kWIDTH [UIScreen mainScreen].bounds.size.width
//屏幕高度

#define kHEIGHT [UIScreen mainScreen].bounds.size.height

1. UIImageView * lunchImg=[[UIImageView alloc]initWithFrame:CGRectMake(0, 0, WIDTH, HEIGHT)];
2. lunchImg.image=[UIImage imageNamed:@"lunch"];
3. [[UIApplication sharedApplication].keyWindow addSubview:lunchImg];
4. [UIView animateWithDuration:0.8 animations:^{
5. lunchImg.layer.transform = CATransform3DMakeScale(1.5, 1.5, 1);
6. lunchImg.alpha=0.0;
7. } completion:^(BOOL finished) {
8. [lunchImg removeFromSuperview];
9. }];