CustomKeyBoardExtension中的当前文本选择 [英] Current text selection in CustomKeyBoardExtension

问题描述

我正在尝试编写 自定义键盘扩展程序 。

I'm trying to write Custom Keyboard Extension.

我'我在 CustomKeyboardExtension中寻找知道光标位于 UITextField ， UITextView ...等的方法 ...但我没有看到类似的东西。

I'm looking for the way to know where the cursor is on UITextField,UITextView...etc in CustomKeyboardExtension ... but I don't see anything like that.

我看到了SwiftKey app（ http://swiftkey.com ）可以做到（或做类似的事情）。当我更改光标时，建议文本将会改变（见下图）。

I saw SwiftKey app (http://swiftkey.com) can do that (or do something like that). When I change the cursor, suggestion-text will change (see below pictures).

问：我们如何才能获得当前文本选择？

Q: How can we get current text selection?

...

更新日期：29/09/2014

好的，我太傻了。我们可以使用 documentContextBeforeInput ， documentContextAfterInput textDocumentProxy 属性的方法。我以为之前，之后是关于时间的。实际上这是关于这个位置。

Ok, I'm so foolish. We can use documentContextBeforeInput, documentContextAfterInput methods of textDocumentProxy property. I thought that "Before","After" are about the time. Actually it's about the position.

对不起所有！我浪费你的时间:(

Sorry all! I wasted your time :(

推荐答案

创建lastWordBeforeInput方法......

Create lastWordBeforeInput method...

-(NSString *) lastWordBeforeInput{
    NSArray *arrayOfSplitsString = [self.textDocumentProxy.documentContextBeforeInput componentsSeparatedByString:@" "];
    int countIndex = arrayOfSplitsString.count - 1;
    NSCharacterSet *ChSet = [NSCharacterSet alphanumericCharacterSet];
    NSCharacterSet *invertedChSet = [ChSet invertedSet];
    while (countIndex > 0) {
        NSString *lastWordOfSentance = [arrayOfSplitsString objectAtIndex:countIndex--];
        if ([[lastWordOfSentance stringByTrimmingCharactersInSet:invertedChSet] rangeOfCharacterFromSet:ChSet].location != NSNotFound) {
            return [lastWordOfSentance stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
        }
    }

    return @"";
}

然后打电话给我t根据要求使用textWillChange / textDidChange。

Then call it with textWillChange/textDidChange as per requirement.

- (void)textWillChange:(id<UITextInput>)textInput {
    // The app is about to change the document's contents. Perform any preparation here.
    NSLog(@"%@",[self lastWordBeforeInput]);
}

希望这会对你有帮助。

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