颜色渐变

CAGradientLayer *colorLayer = [CAGradientLayer layer]; colorLayer.frame = (CGRect){CGPointZero, CGSizeMake(200, 200)}; colorLayer.position = self.view.center; [self.view.layer addSublayer:colorLayer]; // 颜色分配 colorLayer.colors = @[(__bridge id)[UIColor redColor].CGColor, (__bridge id)[UIColor greenColor].CGColor, (__bridge id)[UIColor blueColor].CGColor]; // 颜色分割线 colorLayer.locations = @[@(0.25), @(0.5), @(0.75)]; // 起始点 colorLayer.startPoint = CGPointMake(0, 0); // 结束点 colorLayer.endPoint = CGPointMake(1, 0);