从UIButton获取UILabel [英] Get UILabel out of UIButton

问题描述

我有一个UIButton添加了UILabel作为子视图。

I have an UIButton to which an UILabel was added as a subview. Is there an easy way to get the UILabel back out of it so I can change it's title ?

推荐答案

如果你有一个简单的方法来取回UILabel，你仍然有一个标签，你可以通过搜索标签来查找它$ c>。

If you assign a tag to it while you still have a reference to it, you can later find it by searching for views with that tag.

像这样：

UILabel *label = [[UILabel alloc] init...];
label.tag = 1000;

后来...

UILabel *label = (UILabel *)[button viewWithTag:1000];

如果您无法设置标记，您还可以循环按钮的子视图，查找 UILabel 的实例：

If there's no way for you to set the tag, you can also loop over the button's subviews, looking for an instance of UILabel:

UILabel *label;
for (NSObject *view in button.subviews) {
    if ([view isKindOfClass:[UILabel class]]) {
        label = (UILabel *)view;
        break;
    }
}
// Do stuff with label

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