UITextField“值已更改”字段更新时不触发 [英] UITextField "value changed" not firing when field is updated

问题描述

我有一个 IBAction 我已经连接到Interface Builder中的 UITextField 元素。 （在值已更改事件中出场）

I have an IBAction that I have connected to a UITextField element in Interface Builder. (Firing on "value changed" event)

我还有一个 UISlider ，它会自动更新TextField元素价值得到调整。

I also have a UISlider that updates the TextField element automatically when it's value gets adjusted.

当我运行我的应用程序时，我调整滑块时TextField会更新，但发生这种情况时值已更改事件不会触发。当我手动编辑TextField时，也不会触发值更改事件。 （虽然使用Did Editing End触发器确实会触发它。）

When I run my app, the TextField does get updated when I adjust the slider, but the "value changed" event does not fire when this happens. The value changed event also does not fire when I edit the TextField by hand as well. (Although using the Did Editing End trigger does cause it to fire).

我的问题是，如何获取值更改触发器以进行程序化更新TextField以及用户调整值时。

My question is, how can I get the value changed trigger to fire for both a programmatic update of the TextField as well as when the user adjusts the value.

推荐答案

根据TheRonin的建议，使用 UITextFieldDelegate 并实现以下方法

As suggested by TheRonin, use UITextFieldDelegate and implement the following method

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string

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