圆角与阴影有冲突不可共存

常规设置圆角 _imgView makeRadius:_imgView.hight/2;(圆形)

再设置阴影就会有冲突阴影不显示

设置一个View作为imgView的父视图,设置阴影数据，最后记得  [shadowView addSubview:_imgView];

UIView *shadowView = [[UIView alloc]initWithFrame:_imgView.frame];

    [self.View addSubview:shadowView];

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

 shadowView.layer.shadowOffset = CGSizeMake(0, 5);

shadowView.layer.shadowOpacity = 0.2;

shadowView.layer.shadowRadius = 9.0;

 shadowView.layer.cornerRadius = 9.0;

shadowView.clipsToBounds = NO;

  [shadowView addSubview:_imgView];