当所述改变不是由所述键盘进行时，检测所述UITextField的内容的改变 [英] detecting the change of content of UITextField when the change is not made by the keyboard

问题描述

我有一个 UIButton 和 UITextField ，当按下按钮时，textfield的内容字符串将等于：这是一个测试字符串，在这种情况下如何检测到此文本字段已更改其内容？

I have a UIButton and a UITextField,when the button is pressed the textfield's content string will be equal to: This is a test string, how can I detect that this text field has changed its contents in this case?

ps UITextField的委托方法不适用于这种情况

p.s. UITextField's delegate methods do not work in such case

UPDATE：

推荐答案

也许简单 键值观察 工作？

Maybe simple key-value observing will work?

[textField addObserver:self forKeyPath:@"text" options:0 context:nil];

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
    if([keyPath isEqualToString:@"text"] && object == textField) {
        // text has changed
    }
}

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编辑：我只是检查它，它适用于我。

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I just checked it, and it works for me.

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