//设置颜色的渐变过程 CAGradientLayer * gradientLayer = [CAGradientLayer layer]; gradientLayer.frame = CGRectMake(0, 0, viewLine.frame.size.width, 5); gradientLayer.startPoint = CGPointMake(0, 0.0); gradientLayer.endPoint = CGPointMake(1.0, 0.0);

NSMutableArray * gradientLayerColors;gradientLayerColors = [NSMutableArray arrayWithArray:@[(__bridge id)[颜色一].CGColor,

(__bridge id)[颜色2].CGColor]]; gradientLayer.colors = gradientLayerColors; [view.layer addSublayer:gradientLayer];