IOS实现背景色渐变

//======添加颜色渐变的view====

       self.layerView = [[UIViewalloc] init];

       self.layerView.userInteractionEnabled =YES;

     CAGradientLayer* gradientLayer;

    gradientLayer = [CAGradientLayerlayer];  //设置渐变效果

    gradientLayer.bounds =self.layerView.bounds;

    gradientLayer.borderWidth =0;

    

    gradientLayer.frame =self.layerView.bounds;

    gradientLayer.colors = [NSArrayarrayWithObjects:

                            (id)[[UIColorcolorWithHexString:@"#01215F"]CGColor],

                            (id)[[UIColorcolorWithHexString:@"#F3F3F5"]CGColor], nil];

    gradientLayer.startPoint =CGPointMake(0.5,0.0);

    gradientLayer.endPoint =CGPointMake(0.5,0.8);

    

    

    [self.layerView.layerinsertSublayer:gradientLayer atIndex:0];

    [selfaddSubview:self.layerView];