iPhone:禁用"双击空格键".捷径？

Question

默认情况下,如果您在iPhone或iPad上点击空格键两次,而不是获得""(两个空格),则会得到"."(一段时间后跟一个空格).有没有办法在代码中禁用此快捷方式？

更新:通过UITextInputTraits禁用自动更正不起作用.

更新2:明白了!请参阅下面的帖子.

Answer 1

我有一个基于Chaise给出的答案.

Chaise的方法不允许您按顺序键入两个空格 - 在某些情况下这是不可取的.这是一种完全关闭自动周期插入的方法:

迅速

在委托方法中:

func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
    //Ensure we're not at the start of the text field and we are inserting text
    if range.location > 0 && text.count > 0
    {
        let whitespace = CharacterSet.whitespaces

        let start = text.unicodeScalars.startIndex
        let location = textView.text.unicodeScalars.index(textView.text.unicodeScalars.startIndex, offsetBy: range.location - 1)            

        //Check if a space follows a space
        if whitespace.contains(text.unicodeScalars[start]) && whitespace.contains(textView.text.unicodeScalars[location])
        {
            //Manually replace the space with your own space, programmatically
            textView.text = (textView.text as NSString).replacingCharacters(in: range, with: " ")

            //Make sure you update the text caret to reflect the programmatic change to the text view
            textView.selectedRange = NSMakeRange(range.location + 1, 0)

            //Tell UIKit not to insert its space, because you've just inserted your own
            return false
        }
    }

    return true
}

现在,您可以根据需要尽可能快地点击空格键,只插入空格.

Objective-C的

在委托方法中:

- (BOOL) textView:(UITextView*)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString*)text

添加以下代码:

//Check if a space follows a space
if ( (range.location > 0 && [text length] > 0 &&
      [[NSCharacterSet whitespaceCharacterSet] characterIsMember:[text characterAtIndex:0]] &&
      [[NSCharacterSet whitespaceCharacterSet] characterIsMember:[[textView text] characterAtIndex:range.location - 1]]) )
{
    //Manually replace the space with your own space, programmatically
    textView.text = [textView.text stringByReplacingCharactersInRange:range withString:@" "];

    //Make sure you update the text caret to reflect the programmatic change to the text view
    textView.selectedRange = NSMakeRange(range.location+1, 0);  

    //Tell Cocoa not to insert its space, because you've just inserted your own
    return NO;
}

Answer 2

这是我可以在 Swift 4 中解决这个问题的最简单的解决方案。它比其他一些答案更完整，因为它允许连续输入多个空格。

func disableAutoPeriodOnDoubleTapSpace() {
    textField.addTarget(self, action: #selector(replaceAutoPeriod), for: .editingChanged)
}

@objc private func replaceAutoPeriod() {
    textField.text = textField.text.replacingOccurrences(of: ". ", with: "  ")
}

如果您的文本字段的格式为 .attributedText，则您需要在设置 .text 值之前存储旧的 .selectedTextRange 并重置它。否则，在字符串中间进行编辑时，光标将移动到文本的末尾。

希望这可以帮助那些尝试了所有其他答案但没有运气的人！

Answer 3

好吧，我明白了。在您的 UITextView 委托中，添加以下内容：

-(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text {
    if([text isEqualToString:@". "])
        return NO;
}