分析原因：因?yàn)榇a中設(shè)置了masksToBounds屬性為YES了，將后面設(shè)置的陰影效果給裁剪掉了，所以我們看不到陰影效果，如果我們將masksToBounds屬性為NO了，這樣就會失去圓角效果

解決方案：給imageView添加一個父視圖，在父視圖上添加陰影效果就好，這樣就不會對imageView的圓角造成影響了

實(shí)例代碼：UIImageView*imgView = [[UIImageViewalloc]initWithFrame:CGRectMake(0,0,150,200)];

? ? imgView.layer.masksToBounds = YES;

? ? imgView.layer.cornerRadius=20;

? ? imgView.backgroundColor = [UIColor whiteColor];

? ? UIView*shadowView = [[UIViewalloc]initWithFrame:CGRectMake(200,200,150,200)];

? ? [self.viewaddSubview:shadowView];

? ? shadowView.layer.shadowColor = [UIColor blackColor].CGColor;

? ? shadowView.layer.shadowOffset = CGSizeMake(0, 2);

? ? shadowView.layer.shadowOpacity=0.2;

? ? shadowView.layer.shadowRadius=3.0;

? ? shadowView.layer.cornerRadius=3.0;

? ? shadowView.clipsToBounds=NO;

? ? [shadowViewaddSubview:imgView];

效果截圖：