UITextField becomeFirstResponder 触发_resignFirstResponder

Posted 2023-02-23

【中文标题】UITextField becomeFirstResponder 触发_resignFirstResponder

【英文标题】：UITextField becomeFirstResponder triggers _resignFirstResponder

【发布时间】：2013-12-23 11:51:10

【问题描述】：

我正在以编程方式创建一个UITextField，将其添加到视图中，然后通过调用开始编辑

    [textField becomeFirstResponder];

但问题是这个调用触发了对 textFieldDidEndEditing: 委托方法的调用。堆栈跟踪指向由 becomeFirstResponder 调用的[textField _resignFirstResponder]。这发生在模拟器和ios 7 上。我该如何避免这种情况？这导致了很多问题，因为我不希望在没有键盘被解雇的情况下调用textFieldDidEndEditing:。

编辑：这是我创建 UITextField 的方法。

    UITextField *titleField = [[[UITextField alloc] init] autorelease];

     [titleField addTarget:self action:@selector(textFieldDidChange:) forControlEvents:UIControlEventEditingChanged];
     titleField.textColor = [UIColor colorWithWhite:1.f alpha:0.8];
     titleField.font = [UIFont fontWithName:@"HelveticaNeue-Medium" size:40.f];
     titleField.textAlignment = NSTextAlignmentCenter;
     titleField.borderStyle = UITextBorderStyleBezel;
     titleField.autocorrectionType = UITextAutocorrectionTypeNo;
    //   titleField.borderStyle = UITextBorderStyleLine;
     titleField.frame = CGRectMake(0, 0, 200, 80);
     titleField.center = self.previewView.center;
     titleField.delegate = self;


     NSDictionary *titleDictionary = [self titleDictionary];

     if (titleDictionary) 
        titleField.text = [titleDictionary objectForKey:kTitleStringKey];
        NSString *fontName = [titleDictionary objectForKey:kTitleFontNameKey];
        CGFloat fontSize = [[titleDictionary objectForKey:kTitleFontSizeKey] floatValue];
        titleField.font = [UIFont fontWithName:fontName size:fontSize];
        NSData *textColorData = (NSData *)[titleDictionary objectForKey:kTitleTextColorKey];
        titleField.textColor = [NSKeyedUnarchiver unarchiveObjectWithData:textColorData];

        CGSize size = [titleField.text sizeWithFont:titleField.font];
        titleField.frame = CGRectMake(0, 0, size.width + 40, 80);
        titleField.center = self.previewView.center;
     

     [self.view addSubview:titleField];
     [titleField becomeFirstResponder];

【问题讨论】：

给我看看你创建 UITextField 的代码

请查看问题中的编辑。谢谢！

【参考方案1】：

好的，我找到了。我有一个触发添加 UITextField 例程的 UILongPressGestureRecognizer，并且在长按时偶然调用了两次（需要弄清楚原因，但这是一个单独的问题）。所以 becomeFirstResponder 被调用了两次。