在UIImageView分类里添加方法
@implementation UIImageView (custom)
//设置圆角
- (void)setImageCornerRadius: (CGFloat)radius {
self.layer.cornerRadius = radius;
// ios9之后对imageview设置不会触发离屏渲染
self.layer.masksToBounds = YES;
}
//设置阴影
- (void)setShadowWithColor:(UIColor *)color shadowXOffset:(CGFloat)xOffset
shadowYOffset:(CGFloat)yOffset
shadowRadius:(CGFloat)radius
shadowOpacity:(CGFloat)opacity{
if (self.superview == nil) {
NSLog(@"WRNING: a parent view of the image view is necessary to add a shadow view.");
return;
}
//shadowContainer 为在imageview的父view中加的 设置阴影的view
if (self.shadowContainer != nil) {
[self.shadowContainer removeFromSuperview];
}
self.shadowContainer = [[UIView alloc] initWithFrame: self.frame];
self.shadowContainer.userInteractionEnabled = NO;
self.shadowContainer.backgroundColor = [UIColor whiteColor];
self.shadowContainer.layer.shadowColor = color.CGColor;
self.shadowContainer.layer.shadowOffset = CGSizeMake(xOffset, yOffset);
self.shadowContainer.layer.shadowRadius = radius;
self.shadowContainer.layer.shadowOpacity = opacity;
self.shadowContainer.layer.cornerRadius = self.layer.cornerRadius;
//必加该句 直接向Core Animation提供阴影形状，通过调用setShadowPath来提供一个CGPath给视图的Layer，（CGPath为任意你想生成的阴影的形状)，可以防止离屏渲染
self.shadowContainer.layer.shadowPath = [UIBezierPath bezierPathWithRoundedRect:self.bounds cornerRadius:radius].CGPath;
self.shadowContainer.clipsToBounds = NO;
[self.superview insertSubview:self.shadowContainer atIndex:0];
}
@end
