{

　　CAGradientLayer *_layer;

}

//创建渐变层

    _layer =[CAGradientLayer layer];

    _layer.frame=self.view.frame;

    //设置渐变开始的坐标

    _layer.startPoint=CGPointMake(0.0, 0.4);

    //设置渐变结束的坐标

    _layer.endPoint=CGPointMake(0.0, 1.0);

    //将渐变层添加到视图层上

    [self.view.layer insertSublayer:_layer atIndex:];

    UIColor *color1 =[UIColor colorWithRed:0.427451 green:0.737255 blue:0.643137 alpha:];

    UIColor *color2 =[UIColor colorWithRed:0.572549 green:0.345098 blue:0.74902 alpha:];

    //设置渐变层的颜色数组

    _layer.colors=@[(id)[color1 CGColor ],(id)[color2 CGColor]];