[objective C] CALayer - UILabel 的垂直翻轉

[CALayer]

CALayer Class Reference

使用 CALayer 展示大小不同的影像

//宣告image物件 UIImage *aImage = [UIImage imageNamed:@"myPhoto.jpg"]; //使用"layer" class method建立CALayer物件 CALayer *layer1 = [CALayer layer]; //設定CALayer的frame大小 layer1.frame = CGRectMake(110, 20, 100, 66); //設定CALayer的內容為image物件 layer1.contents = (id)aImage.CGImage; //將CALayer置入view [self.view.layer addSublayer:layer1]; //以下用同樣方式設定大小不同的CALayer CALayer *layer2 = [CALayer layer]; layer2.frame = CGRectMake(85, 106, 150, 100); layer2.contents = (id)aImage.CGImage; [self.view.layer addSublayer:layer2]; CALayer *layer3 = [CALayer layer]; layer3.frame = CGRectMake(0, 226, 320, 213); layer3.contents = (id)aImage.CGImage; [self.view.layer addSublayer:layer3];

UILabel 的垂直翻轉

label.layer.transform = CATransform3DMakeRotation(M_PI, 1.0f, 0.0f, 0.0f);