控件设置渐变色

  CAGradientLayer *gl = [CAGradientLayer layer];

    gl.frame=CGRectMake(80,588.5,217.5,45);

    gl.startPoint = CGPointMake(0, 0);

    gl.endPoint = CGPointMake(1, 1);

    gl.colors = @[(__bridge id)[UIColor colorWithRed:202/255.0 green:242/255.0 blue:132/255.0 alpha:1.0].CGColor,(__bridge id)[UIColor colorWithRed:185/255.0 green:238/255.0 blue:142/255.0 alpha:1.0].CGColor];

    gl.locations = @[@(0.0),@(1.0)];

    [self.nextBtn.layer addSublayer:gl];

    self.nextBtn.backgroundColor = MYHEXColor(0xB9EE8E);