的CALayer與旋轉動畫

Question

我掩蓋的圖像是這樣的：

UIView *maskImage; maskImage = [[UIView alloc] init]; 
maskImage.backgroundColor = UIColorFromRGB(FTRMaskColor); 
maskImage.frame = newFrame; 

CALayer *theLayer = [CALayer layer]; 
theLayer.contents = (id)[[UIImage imageNamed:@"image.png"] CGImage]; 
theLayer.frame = newFrame; 

maskImage.layer.mask = theLayer; 

它工作正常，但主要問題是，如果我想旋轉我的iPad，視圖的旋轉動畫或層（I不太確定）不起作用。它沒有動畫旋轉。你能幫忙嗎？

Answer 1

要旋轉CALayer：

NSNumber *rotationAtStart = [myLayer valueForKeyPath:@"transform.rotation"]; 
CATransform3D myRotationTransform = CATransform3DRotate(myLayer.transform, myRotationAngle, 0.0, 0.0, 1.0); 
myLayer.transform = myRotationTransform;   
CABasicAnimation *myAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation"]; 
myAnimation.duration = kMyAnimationDuration; 
myAnimation.fromValue = rotationAtStart; 
myAnimation.toValue = [NSNumber numberWithFloat:([rotationAtStart floatValue] + myRotationAngle)]; 
[myLayer addAnimation:myAnimation forKey:@"transform.rotation"]; 

myRotationAngle應在弧度。逆時針旋轉使用負值，順時針使用正值。

Answer 2

使用CA3Daffinetransform旋轉

Answer 3

 CAKeyframeAnimation *rotation = [CAKeyframeAnimation animation]; 
     rotation.keyPath = @"transform.rotation"; 
     rotation.values = @[ @0.14, @0,@0.2 ,@0]; 
     rotation.timingFunctions = @[ 
            [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut], 
            [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut], 
            [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut], 
            [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut] 
            ]; 
     rotation.fillMode   = kCAFillModeForwards; 
     rotation.removedOnCompletion = NO; 
     rotation.beginTime = AVCoreAnimationBeginTimeAtZero; 
     [imageLayer addAnimation:rotation forKey:@"rotation"];