ios - 将 UITextfield 中的每个字符记录到 IOS 中的 NSDictionary

Question

我正在使用 UICollectionview，每个单元格都有 UITextfield，我试图从每个文本字段获取完整的字符串并保存到字典中。我使用了以下代码

  - (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
    if (textField.tag==100) {
         [m11ThumbImage_MutCaptionDictionary setValue:[textField.text stringByAppendingString:string] forKey:@"image_0001"];
    }
    if (textField.tag==101) {
        [m11ThumbImage_MutCaptionDictionary setValue:[textField.text stringByAppendingString:string] forKey:@"image_0002"];
    }
    }

我试过:

使用上面的代码我能够正确设置字符串，但是，如果我删除字符，则不会调用上述方法并且不会更新字典。

TextFieldDidBeginEditing 调用最初只能记录 1 个字符。还尝试了其他委托(delegate)方法

预期输出:

{
image_0001: All Character,
image_0002: A
}

任何帮助都会被投票。谢谢。

Answer 1

textField shouldChangeCharactersInRange 在 text field 实际更改其文本之前被调用，如果您需要获取更新值，则执行此操作

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
      
    if (textField.tag==100) {
         [m11ThumbImage_MutCaptionDictionary setValue:[textField.text stringByReplacingCharactersInRange:range withString:string] forKey:@"image_0001"];
    }
    else if (textField.tag==101) {
    [m11ThumbImage_MutCaptionDictionary setValue:[textField.text stringByReplacingCharactersInRange:range withString:string] forKey:@"image_0002"];
}
}

更新的答案

 - (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
      
        NSString * currentStr = [textField.text stringByReplacingCharactersInRange:range withString:string];

    if (textField.tag==100) {
         [m11ThumbImage_MutCaptionDictionary setValue:currentStr forKey:@"image_0001"];
    }
    else if (textField.tag==101) {
    [m11ThumbImage_MutCaptionDictionary setValue:currentStr forKey:@"image_0002"];
     }
  return YES;
}

替代方式

在你的 viewdidload 中添加要获取 EditingChanged textfield 事件，我建议将选择器添加为

[textField addTarget:self action:@selector(textChanged:) forControlEvents:UIControlEventEditingChanged];

随着文本字段值的更改，您将从这个 textChanged: 选择器中获得更改后的值。

 -(void)textChanged:(UITextField *)textField
   {
    NSLog(@"textfield data %@ ",textField.text);
    if (textField.tag==100) {
     [m11ThumbImage_MutCaptionDictionary setValue:[textField.text stringByAppendingString:string] forKey:@"image_0001"];
   }
 else if (textField.tag==101) {
    [m11ThumbImage_MutCaptionDictionary setValue:[textField.text stringByAppendingString:string] forKey:@"image_0002"];
}
}