ios - CAGradientLayer not draw the gradient correctly -

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i use cashapelayer draw circle , set mask of cagradientlayer, here code:

cashapelayer *circleshapelayer = [cashapelayer new]; // draw circle path code here...  cagradientlayer *gradientlayer = [cagradientlayer layer]; gradientlayer.colors = @[(__bridge id)[uicolor whitecolor].cgcolor,                          (__bridge id)[uicolor clearcolor].cgcolor]; // self here means uiview gradientlayer.mask = circleshapelayer; gradientlayer.frame = self.bounds; [self.layer addsublayer:gradientlayer];

when run app, display gradient circle, gradient strange.

what want circle @ start point, color white , @ end point color clear color, should this:

enter image description here

but color of circle in simulator screen is:

enter image description here

the color symmetric.

i think problem not set gradientlayer.colors correctly, how can fix it?

cagradientlayer can not paint gradient along arc. on other hand, mask layer's frame small gradient layer's frame see clear color


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