iOS 学习笔记27-CALayer

首先 添加图片到项目

UIImageView *imageView = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"1"]];

imageView.center = self.view.center;

[self.view addSubview:imageView];

//设置阴影

imageView.layer.shadowColor = [[UIColor yellowColor]CGColor];

//阴影偏移

imageView.layer.shadowOffset= CGSizeMake(10, 10);

//阴影透明度

imageView.layer.shadowOpacity = 0.5;

//阴影圆角大小

imageView.layer.cornerRadius = 8;

imageView.layer.masksToBounds = YES;//必须设置这个属性才能圆角

//设置边框

imageView.layer.borderWidth = 8;

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

//设置旋转

//    imageView.layer.transform = CATransform3DMakeRotation(M_PI_4, 1, 1, 0);

imageView.layer.transform = CATransform3DMakeScale(0.5, 1, 1);

这里要注意：如果要设置图层圆角，必须要设置

imageView.layer.masksToBounds = YES;//必须设置这个属性才能圆角