iOS开发点滴－添加阴影效果

UIBezierPath *shadowPath = [UIBezierPath bezierPathWithRect:imageView.bounds];
imageView.layer.masksToBounds = NO;
imageView.layer.shadowColor = [UIColor blackColor].CGColor;
imageView.layer.shadowOffset = CGSizeMake(0.0f, 5.0f);
imageView.layer.shadowOpacity = 0.5f;
imageView.layer.shadowPath = shadowPath.CGPath;

//添加显示

UIImage *image = [UIImage
imageNamed:@"touxiang"];

UIImageView *imageView = [[UIImageView
alloc]initWithImage:image];

imageView.frame =
CGRectMake(50,
100, 200,
200);

//添加边框

// CALayer * layer = [imageView layer];

// layer.borderColor = [[UIColor redColor] CGColor];

// layer.borderWidth = 5.0f;

// imageView.layer.borderColor = [UIColor lightGrayColor].CGColor;

// imageView.layer.borderWidth = 5.0f;

//添加四个边阴影

// imageView.layer.shadowColor = [UIColor greenColor].CGColor;//阴影颜色

// imageView.layer.shadowOffset = CGSizeMake(0, 0);//偏移距离

// imageView.layer.shadowOpacity = 0.5;//不透明度

// imageView.layer.shadowRadius = 10.0;//半径

//添加两个边阴影

imageView.layer.shadowColor = [UIColor
blueColor].CGColor;//阴影颜色

imageView.layer.shadowOffset =
CGSizeMake(4,
4);//偏移距离

imageView.layer.shadowOpacity =
0.5;//不透明度

imageView.layer.shadowRadius =
2.0;//半径

[self.view
addSubview:imageView];