UITextPosition到Int [英] UITextPosition to Int

问题描述

我有一个UISearchBar，我试图设置一个光标位置。我正在使用UITectField委托，因为我找不到任何直接用于UISearchBar的东西。以下是我正在使用的代码：

I have a UISearchBar on which I am trying to set a cursor position. I am using UITectField delegates as I couldn't find anything direct for UISearchBar. Below is the code I am using:

  UITextField *textField = [searchBar valueForKey: @"_searchField"];
  // Get current selected range , this example assumes is an insertion point or empty selection
  UITextRange *selectedRange = [textField selectedTextRange];
  // Construct a new range using the object that adopts the UITextInput, our textfield
  UITextRange *newRange = [textField textRangeFromPosition:selectedRange.start toPosition:selectedRange.end];

问题 位于'newRange'中'toPosition'的对象我希望有类似selectedRange.end-1的东西;因为我希望光标位于倒数第二位。

Question is in the 'newRange' object for 'toPosition' I want to have something like selectedRange.end-1; as I want the cursor to be on second last position.

如何将光标设置到倒数第二位？

How do I set the cursor to second last position?

推荐答案

线索是建立一个位置，然后是一个没有长度的范围，然后选择它

the clue is to make a position and then a range with no length and then select it

例如

- (IBAction)select:(id)sender {
    //get position: go from end 1 to the left
    UITextPosition *pos = [_textField positionFromPosition:_textField.endOfDocument
                                               inDirection:UITextLayoutDirectionLeft
                                                    offset:1];

    //make a 0 length range at position
    UITextRange *newRange = [_textField textRangeFromPosition:pos
                                                toPosition:pos];

    //select it to move cursor
    _textField.selectedTextRange = newRange;
}

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