UITextField右对齐iOS 7

Question

我有一个问题，在 iOS7 上右对齐 UITextField 时，当用户键入“空格”时，它不会立即出现。如果我键入另一个字符，则会出现空格。

在 iOS 6 中不会发生

http://www.blogosfera.co.uk/2013/10/ios-7-whitespace-not-visible-to-uitextfield-with-right-alignment/

有人知道如何解决这个问题吗？

Answer 1

-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
    if (range.location == textField.text.length && [string isEqualToString:@" "]) {
        // ignore replacement string and add your own
        textField.text = [textField.text stringByAppendingString:@"\u00a0"];
        return NO;
    }
    // for all other cases, proceed with replacement
    return YES;
}

从文本中删除代码

self.txtFirstName.text = [self.txtFirstName.text stringByReplacingOccurrencesOfString:@"\u00a0" withString:@" "];

来自这个 stackoverflow 答案 - Right aligned UITextField spacebar does not advance cursor in iOS 7

Answer 2

我不知道如何解决，但我有一个建议，您可以同时将所有空格替换为非常相似的 unicode 字符（如 U+00A0），然后将它们切换回来已输入字符？

只需在 .h 中包含 <UITextFieldDelegate>，在 viewDidLoad 中设置 UITextField.delegate = self;

然后执行如下操作：

 //!!!!!*****!*!*!!!*!*** Make SURE you set the delegate code before doing this (as mentioned in the original SO answer)

 -(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
    if ([string isEqualToString:@" "]) {
        textField.text = [textField.text stringByReplacingCharactersInRange:range withString:@"\u00A0"];//U+00A0 is a unicode character that seems very similar to space but isn't treated as whitespace...
    } else {
        textField.text = [textField.text stringByReplacingOccurrencesOfString:@"\u00A0" withString:@" "];//switches our u+00A0 unicode character back to a white-space everytime a space is not typed.
    }
    return (![string isEqualToString:@" "]);//returns YES if it doesn't equal whitespace, else NO (because we did a manual replace)
}

*注意，我还没有机会对此进行测试，因为我不在 xCodeProj 附近。让我知道它是如何工作的 :) 如果有人看到任何错误，请随时进行编辑 O:) 谢谢大家！