UIImage加阴影

       UIImageView*pageContenterImageView = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"onePageApple.png"]];
             //添加边框
              CALayer*layer = [pageContenterImageView layer];
              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; 
  
 

  
 
 

       UIView * content=[[UIView alloc] initWithFrame:CGRectMake(100, 250, 503, 500)];
          content.backgroundColor=[UIColor orangeColor];
         //content.layer.shadowOffset=10;
          content.layer.shadowOffset = CGSizeMake(5, 3);
          content.layer.shadowOpacity = 0.6;
          content.layer.shadowColor = [UIColor blackColor].CGColor;
          [self.window addSubview:content];
  
 

文章来源: zzzili.blog.csdn.net，作者：清雨小竹，版权归原作者所有，如需转载，请联系作者。

原文链接：zzzili.blog.csdn.net/article/details/8351034