当我返回false时，为什么textFieldShouldReturn仍在工作? [英] Why textFieldShouldReturn is still working when i return false?

问题描述

我隐藏了通过执行功能textFieldShouldReturn并在此函数内调用resignFirstResponder()按下的返回键上的键盘.它工作正常，但是当我在此函数中返回false时，键盘仍处于隐藏状态.现在，我不明白如果两种情况下都隐藏了键盘，返回true或false有什么用?

I am hiding keyboard on return key pressed by implementing function textFieldShouldReturn and calling resignFirstResponder() inside this function. It works perfectly but when I return false in this function, still then keyboard is hiding. Now here I do not understand that what is use of returning true or false if keyboard is hiding in both case?

推荐答案

由于调用resignFirstResponder，键盘被关闭了.它与textFieldShouldReturn的返回值无关.

The keyboard is being dismissed due to the call to resignFirstResponder. It has nothing at all to do with the return value of textFieldShouldReturn.

根据我的经验，textFieldShouldReturn的返回值几乎没有用.在大多数情况下，返回true还是false都没关系.

In my experience, the return value of textFieldShouldReturn almost has no use. In the vast majority of cases it makes no difference whether you return true, or false.

我在testFieldShouldReturn的所有用法中都返回了false.如果返回true，并且您的textFieldShouldReturn实现将第一个响应者设置为UITextView，则文本视图最终会在其中添加换行符.从textFieldShouldReturn返回false确保不会发生这种情况.但这是基于几年前使用iOS 4或5的经验.我不知道最新版本的iOS是否还会发生这种情况.

I return false in all my uses of testFieldShouldReturn. If you return true and your implementation of textFieldShouldReturn sets the first responder to a UITextView, the text view ends up getting the newline added to it. Returning false from textFieldShouldReturn ensures this won't happen. But this was based on experience with iOS 4 or 5 a few years ago. I don't know if that still happens with the latest versions of iOS.

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