渐变

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渐变

推荐一篇博客 很详细: http://www.cocoachina.com/ios/20161009/17704.html

  1. colors 渐变的颜色
  2. locations 渐变颜色的分割点

  3. startPoint&endPoint 颜色渐变的方向，范围在(0,0)与(1.0,1.0)之间，如(0,0)(1.0,0)代表水平方向渐变,(0,0)(0,1.0)代表竖直方向渐变

    CAGradientLayer *gradientLayer = [CAGradientLayer layer];
    gradientLayer.colors = @[(bridge id)[UIColor redColor].CGColor, (bridge id)[UIColor yellowColor].CGColor, (__bridge id)[UIColor blueColor].CGColor];
    gradientLayer.locations = @[@0.3, @0.5, @1.0];
    gradientLayer.startPoint = CGPointMake(0, 0);
    gradientLayer.endPoint = CGPointMake(1.0, 0);
    gradientLayer.frame = CGRectMake(0, 100, 300, 100);
    [self.view.layer addSublayer:gradientLayer];