iOS View颜色渐变

这里只做记录，具体的逻辑可以去网上查看。

UIButton * changeBtn =[UIButton buttonWithType:UIButtonTypeCustom];

    changeBtn.frame=CGRectMake(SCREEN_WIDTH-94,CGRectGetMaxY(self.msgImage.frame)-20,60,20);

    changeBtn.layer.cornerRadius=10;

    changeBtn.layer.masksToBounds=YES;

    [changeBtnaddTarget:self action:@selector(changeBtnClick) forControlEvents:UIControlEventTouchUpInside];

    CAGradientLayer* gradientLayer =  [CAGradientLayer layer];

    gradientLayer.frame=CGRectMake(0,0,120,34);

    gradientLayer.startPoint=CGPointMake(0.5,1.44);

    gradientLayer.endPoint=CGPointMake(0.5,0.01);

    gradientLayer.locations=@[@(0.1),@(1.0)];//渐变点

    [gradientLayersetColors:@[(id)RGBCOLOR(255,206,198).CGColor,(id)RGBCOLOR(246,109,97).CGColor]];

    [changeBtn.layeraddSublayer:gradientLayer];

    changeBtn.backgroundColor = [UIColor redColor];

    [changeBtnsetTitle:@"兑换" forState:UIControlStateNormal];

    changeBtn.titleLabel.font=FONT(14);

    [self.contentViewaddSubview:changeBtn];

效果大概是这样的