iOS图片等view layer的圆角，边框，阴影设置

//圆角：
UIImageView *imageView;
imageView.layer.cornerRadius = 5;//(值越大，角就越圆)
imageView.layer.masksToBounds = YES;

//边框：
imageView.layer.borderWidth = 1;
imageView.layer.borderColor = [[UIColor colorWithRed:226/255.0 green:230/255.0 blue:232/255.0 alpha:1] CGColor];

//阴影：
imageView.layer.shadowOffset = CGSizeMake(2, 2);
imageView.layer.shadowRadius = 5;
imageView.layer.shadowOpacity = 1;
imageView.layer.shadowColor = [UIColor blackColor].CGColor;

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