转载自： UIImageView*pageContenterImageView = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"onePageApple.png"]];   //添加边框 CALayer*layer = [pageContenterImageViewlayer]; layer.borderColor= [[UIColor whiteColor]CGColor]; layer.borderWidth=0.0f; //添加四个边阴影 pageContenterImageView.layer.shadowColor= [UIColor blackColor].CGColor; pageContenterImageView.layer.shadowOffset=CGSizeMake(0,0); pageContenterImageView.layer.shadowOpacity=0.5; pageContenterImageView.layer.shadowRadius=5.0;   //添加两个边阴影 //pageContenterImageView.layer.shadowColor = [UIColor blackColor].CGColor; //    pageContenterImageView.layer.shadowOffset = CGSizeMake(2, 2); //    pageContenterImageView.layer.shadowOpacity = 0.5; //    pageContenterImageView.layer.shadowRadius = 2.0;       //------------- 阴影渲染会严重消耗内存 ,导致程序咔叽.   /*阴影效果*/ //添加边框 CALayer*layer = [self.pageContenter layer]; layer.borderColor= [[UIColorwhiteColor]CGColor]; layer.borderWidth=0.0f; //添加四个边阴影 self.pageContenter.layer.shadowColor= [UIColorblackColor].CGColor;//阴影颜色 self.pageContenter.layer.shadowOffset=CGSizeMake(0,0);//阴影偏移 self.pageContenter.layer.shadowOpacity=0.5;//阴影不透明度 self.pageContenter.layer.shadowRadius=5.0;//阴影半径 //添加两个边阴影 //self.pageContenter.layer.shadowColor = [UIColor blackColor].CGColor; //self.pageContenter.layer.shadowOffset = CGSizeMake(2, 2); //self.pageContenter.layer.shadowOpacity = 0.5; //self.pageContenter.layer.shadowRadius = 2.0;