CAGradientLayer *colorLayer = [CAGradientLayer layer];
colorLayer.frame = (CGRect){CGPointZero, CGSizeMake(200, 200)};
colorLayer.position = self.view.center;
[self.view.layer addSublayer:colorLayer];
colorLayer.colors = @[(__bridge id)[UIColor redColor].CGColor,
(__bridge id)[UIColor greenColor].CGColor,
(__bridge id)[UIColor blueColor].CGColor,
(__bridge id)[UIColor blackColor].CGColor];
colorLayer.locations = @[@(0.25), @(0.5), @(0.65),@(0.10)];
colorLayer.startPoint = CGPointMake(0, 0);
colorLayer.endPoint = CGPointMake(1, 0);
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