为UIImageView图片增加阴影效果
转载自：http://blog.csdn.net/doubleuto/article/details/6685400
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;
