右对齐的 UITextField 空格键不会在 iOS 7 中前进光标 [英] Right aligned UITextField spacebar does not advance cursor in iOS 7

问题描述

在我的 iPad 应用中，我注意到 iOS 6 和 iOS 7 之间使用 UITextFields 的不同行为.

In my iPad app, I noticed different behavior between iOS 6 and iOS 7 with UITextFields.

我创建 UITextField 如下:

I create the UITextField as follows:

UIButton *theButton = (UIButton*)sender;
UITextField *textField = [[UITextField alloc] initWithFrame:[theButton frame]];

[textField setDelegate:self];
[textField setContentVerticalAlignment:UIControlContentVerticalAlignmentCenter];
[textField setContentHorizontalAlignment:UIControlContentHorizontalAlignmentRight];

textField.textAlignment = UITextAlignmentRight;
textField.keyboardType = UIKeyboardTypeDefault;

...

[textField becomeFirstResponder];

在 iOS 6 中，当我键入hello world"时，当我在hello"之后按空格键时，光标会前进一个空格.

In iOS 6, when I type "hello world" the cursor advances a blank space when I hit the spacebar after "hello."

在 iOS 7 中，当我点击空格键时，光标不会前进.但是，当我在world"中输入w"时，它会显示空格和 w.

In iOS 7, the cursor does not advance when I hit the spacebar. However, when I type the "w" in "world," it shows the space and the w.

如何在 iOS 7 中按空格键时移动光标?

How can I advance the cursor when the spacebar is hit in iOS 7?

更新:

如果我将 textField.textAlignment 更改为 UITextAlignmentLeft，则该空间会出现在 iOS 7 中.如果可能，我希望它保持右对齐.

If I change the textField.textAlignment to UITextAlignmentLeft, then the space appears in iOS 7. I would like to keep it right aligned, if possible.

推荐答案

这有点麻烦，但如果你真的需要它来看待 iOS6 的方式，你可以用 非中断空间，如其所写.它被区别对待.示例代码可能如下所示:

It would be a bit of a hack, but if you really need that to look the iOS6 way, you can replace space with non-breaking space as it's written. It's treated differently. Example code could look like this:

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
    // only when adding on the end of textfield && it's a space
    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;
}

如果不清楚，textField:shouldChangeCharactersInRange:replacementString: 是一个 UITextFieldDelegate 协议方法，所以在你的例子中，上面的方法将在由[textField setDelegate:self].

In case it's not clear, textField:shouldChangeCharactersInRange:replacementString: is a UITextFieldDelegate protocol method, so in your example, the above method would be in the viewcontroller designated by [textField setDelegate:self].

如果您想要恢复常规空格，显然您还需要记住通过将出现的 @"u00a0" 替换为 @" " 来将文本转换回来从文本字段中取出字符串时.

If you want your regular spaces back, you will obviously also need to remember to convert the text back by replacing occurrences of @"u00a0" with @" " when getting the string out of the textfield.

这篇关于右对齐的 UITextField 空格键不会在 iOS 7 中前进光标的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！