ios - 如何设置带角度的渐变色

Question

我想在我的按钮上设置渐变，我必须设置两种颜色的简单线性渐变(无角度)，但我不知道如何在渐变上设置角度值

角度:- 61

下图定义psd渐变叠加效果

提前致谢

Answer 1

试试吧，也许会有帮助

- (CAGradientLayer *)gradientLayerWithColors:(NSArray *)colors angle:(CGFloat)angle {

CAGradientLayer *layer = [CAGradientLayer layer];
layer.colors = colors;

CGFloat x = angle / 360.f;

CGFloat a = pow(sin((2*M_PI*((x+0.75)/2))),2);
CGFloat b = pow(sin((2*M_PI*((x+0.0)/2))),2);
CGFloat c = pow(sin((2*M_PI*((x+0.25)/2))),2);
CGFloat d = pow(sin((2*M_PI*((x+0.5)/2))),2);

layer.startPoint = CGPointMake(a, b);
layer.endPoint = CGPointMake(c, d);
return layer;