Ios CALayer-在保持遮罩静止的同时翻译图像

我有一个CALayer，它包含一个图像，上面有一个遮罩

CALayer*第一层=[CALayer层]

firstLayer.backgroundColor = [UIColor clearColor].CGColor;
firstLayer.frame =  curveView.frame;
firstLayer.position = CGPointMake(curveView.frame.origin.x + 100, curveView.frame.origin.y + 100);
firstLayer.name = @"FirstLayer";
[self.view.layer addSublayer:firstLayer];

CALayer *firstImageLayer = [CALayer layer];
firstImageLayer.frame = firstLayer.bounds;
firstImageLayer.masksToBounds = NO;   
firstImageLayer.name = @"FirstImageLayer";
firstImageLayer.contents = (id)first.CGImage;
[firstLayer addSublayer:firstImageLayer];

firstImageLayer.mask=[cM setMaskOnLayer:firstImageLayer ：@“FirstColor”：（错误）]

我想平移/平移/拖动包含在基础层中的图像，同时保持遮罩固定。（有点像在固定窗口内查看图像）

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帮帮我。

您是否尝试将ImageLayer的逆变换应用于MaskLayer

CALayer* imageLayer = ...;
 CALayer* maskLayer = ...;
 CGAffineTransform inverse = CGAffineTransformInvert(imageLayer.affineTransform);
 maskLayer.affineTransfrom = inverse; //assign everytime imageLayer move or change

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如何解决这个问题你能分享一些代码吗？请帮助我

CALayer* imageLayer = ...;
 CALayer* maskLayer = ...;
 CGAffineTransform inverse = CGAffineTransformInvert(imageLayer.affineTransform);
 maskLayer.affineTransfrom = inverse; //assign everytime imageLayer move or change