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];