iphone - 在 UTextView 中一次移动一个单词

Question

我想创建一个按钮，一次移动一个单词在 UITextView 中的光标位置。从用户的角度来看，这与 Mac OS X 中的 Option-右箭头相同，定义为“转到插入点右侧的单词。”

我找到了几种同时提升角色的方法。您将如何修改它以一次移动一个单词？

- (IBAction)rightArrowButtonPressed:(id)sender
{
     myTextView.selectedRange = NSMakeRange(myTextView.selectedRange.location + 1, 0); 
}

感谢您的任何建议。

Answer 1

能够像这样实现它，

- (IBAction)nextWord {
    NSRange selectedRange = self.textView.selectedRange;
    NSInteger currentLocation = selectedRange.location + selectedRange.length;
    NSInteger textLength = [self.textView.text length];

    if ( currentLocation == textLength ) {
        return;
    }

    NSRange newRange = [self.textView.text rangeOfCharacterFromSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]
                                                           options:NSCaseInsensitiveSearch
                                                             range:NSMakeRange((currentLocation + 1), (textLength - 1 - currentLocation))];
    if ( newRange.location != NSNotFound ) {
        self.textView.selectedRange = NSMakeRange(newRange.location, 0);
    } else {
        self.textView.selectedRange = NSMakeRange(textLength, 0);
    }
}

- (IBAction)previousWord {
    NSRange selectedRange = self.textView.selectedRange;
    NSInteger currentLocation = selectedRange.location;

    if ( currentLocation == 0 ) {
        return;
    }

    NSRange newRange = [self.textView.text rangeOfCharacterFromSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]
                                                           options:NSBackwardsSearch
                                                             range:NSMakeRange(0, (currentLocation - 1))];
    if ( newRange.location != NSNotFound ) {
        self.textView.selectedRange = NSMakeRange((newRange.location + 1), 0);
    } else {
        self.textView.selectedRange = NSMakeRange(0, 0);
    }

}