iOS view 背景渐变色

一：话不多说，先上图

按钮渐变色

二：代码

    //1实现渐变色
    CAGradientLayer *gradient = [CAGradientLayer layer];
    //设置开始和结束位置(设置渐变的方向)
    gradient.startPoint = CGPointMake(0, 0);
    gradient.endPoint = CGPointMake(1, 0);
    gradient.frame = CGRectMake(0,0,_preparatio.width,_preparatio.height);
    gradient.colors = [NSArray arrayWithObjects:(id)[UIColor colorWithHexString:@"#FF6EFD"].CGColor,(id)[UIColor colorWithHexString:@"#FF8D4D"].CGColor,nil];
    //2把渐变色生成为Image
    UIGraphicsBeginImageContextWithOptions(_preparatio.bounds.size, _preparatio.opaque, 0.0);
    [gradient renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    //3设置view背景色
    view.backgroundColor = [UIColor colorWithPatternImage:img];