uilabel - 如何在iPhone中为UILabel的背景设置渐变色

Question

我正在使用以下代码将渐变颜色设置为标签的背景，但没有效果我做错了什么？ 代码在这里:

    [self.teamName setTextColor:[UIColor whiteColor]];
    [self.teamName setBackgroundColor:[UIColor clearColor]];
    CAGradientLayer *gradientLayer = [CAGradientLayer layer];
    gradientLayer.frame = self.teamName.bounds;
    gradientLayer.colors = [NSArray arrayWithObjects:(id)[[UIColor whiteColor]CGColor], (id)[[UIColor blackColor]CGColor], nil];
    [self.teamName.layer insertSublayer:gradientLayer atIndex:0];

Answer 1

当我将 CAGradientLayer 插入主视图时它工作正常。

[self.teamName setTextColor:[UIColor whiteColor]];
    [self.teamName setBackgroundColor:[UIColor clearColor]];
    CAGradientLayer *gradientLayer = [CAGradientLayer layer];
    gradientLayer.frame = self.teamName.bounds;
    gradientLayer.colors = [NSArray arrayWithObjects:(id)[[UIColor whiteColor]CGColor], (id)[[UIColor blackColor]CGColor], nil];
    [self.view.layer insertSublayer:gradientLayer atIndex:0];