一、给图片加上阴影
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;
二、给视图加上阴影
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];