尝试设置 UITextField 文本时执行选择器

发布于 2024-09-26 11:33:06 字数 528 浏览 3 评论 0原文

每当执行 UIControlEventEditingChanged 事件时，我都会尝试清除 UITextField。

但是，当我将文本设置为空时，UIControlEventEditingChanged 事件将再次被调用，并且这就是它继续进行的方式。

这是我的代码：

- (void)updateText {
    //other code
    textfield.text = @"";
    //other code
}

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    [textfield addTarget:self action:@selector(updateText) forControlEvents:UIControlEventEditingChanged];
}

我希望能够设置文本字段的文本，而不会无限循环！

任何帮助表示赞赏。

原文

i'm trying to clear a UITextField whenever the UIControlEventEditingChanged event is being performed.

However, when I set the text to nothing, the UIControlEventEditingChanged event is being called again, and this is the way it keeps going.

This is my code:

- (void)updateText {
    //other code
    textfield.text = @"";
    //other code
}

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    [textfield addTarget:self action:@selector(updateText) forControlEvents:UIControlEventEditingChanged];
}

I would like to be able to set the text of the text field without it looping infinitely!

Any help appreciated.

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巷子口的你 2024-10-03 11:33:06

不确定这是最好的方法，但在对文本字段进行编程更新之前，您可以删除 UIControlEventEditingChanged 侦听器，然后再次添加它。

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寂寞笑我太脆弱 2024-10-03 11:33:06

- (void)updateText {
    //other code
    if (![textfield.text isEqualToString:@""]){
       textfield.text = @"";
    }
    //other code
}

it 可能不是最优雅的解决方案，但它非常快并且肯定会起作用

- (void)updateText {
    //other code
    if (![textfield.text isEqualToString:@""]){
       textfield.text = @"";
    }
    //other code
}

it is probably not the most elegant solution but it is very quick and will surely work

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落花浅忆 2024-10-03 11:33:06

注销事件并重新注册的另一种方法是放入一个 BOOL 来防止这种特定的递归。

@interface MyClass : () {
    BOOL clearText;
}

并在方法中：

- (void)updateText {
    if (clearText){
        clearText = NO;
        return;
    }
    //other code
    clearText = YES;
    textfield.text = @"";
    //other code
}

An alternative to deregistering for the event, and reregistering is to put in a BOOL to guard against this particular recursion.

@interface MyClass : () {
    BOOL clearText;
}

and in the method:

- (void)updateText {
    if (clearText){
        clearText = NO;
        return;
    }
    //other code
    clearText = YES;
    textfield.text = @"";
    //other code
}

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