设置新文本时更改UITextField中的光标 [英] Change cursor in UITextField when set new text
问题描述
我发现一件事.如果我将功能设置为是
I discovery one thing. If i set yes to function
- textField:shouldChangeCharactersInRange:replacementString:
光标停留在我键入的位置,例如("|" =光标)
The cursor stay in the same place I type, like ("|" = cursor)
"|" => Empty , type a
"a|" => type b
"ab|" => change cursor
"a|b" => type c
"ac|b" => type d
"acd|b" => change cursor
"ac|db" => type backspace
"a|db" => type backspace again
"|db" => *result*
但是,如果我必须更改文本,例如将倒数第二个字符放入"-"
,我将执行逻辑操作并将文本设置为:
But, if I have to change the text, like put a "-"
in penultimate character, I do the logic thing and set the text with:
[textField setText:newText];
但是上面的示例将采用这种方式:
But the sample above will be in this way:
"|" => Empty , type a
"a|" => type b (put character "-" automatic)
"a-b|" => user change cursor
"a|-b" => type c
"ac-b|" => type d ## the cursor is in end ##
"acb-d|" => change cursor ## "d" is in wrong place, the user have to
## change cursor to reproduce the result above
"ac|b-d" => type backspace
"ab-d|" => type backspace again ## the cursor is in end again ##
"a-b|" => *result* ## I want delete "a" but it delete "d"
如何将光标设置为与第一个示例中的结果相同的"|d-b"
?或更好的问题:如何更改UITextField中的文本和光标?
How can I set the cursor to the result is the same "|d-b"
like in the first sample? Or better question: How change the text and the cursor in a UITextField?
推荐答案
我找到了解决方案.我不能选择光标的位置,但是它可以做我想要的.您必须使用协议 UIKeyInput 的功能.有两个不错的功能:
I found the solution. I can't choice the cursor place, but it do what I want. You have to use the function of protocol UIKeyInput There are 2 good function:
- (void)insertText:(NSString *)text;
- (void)deleteBackward;
然后,重做测试用例,我有:
Than, redoing my test case, I have:
"|" => Empty , type a
"a|" => type b (put character "-" automatic)
"a-b|" => user change cursor
"a|-b" => type c (enter the character with a [textField insertText:@"c"]
"ac|-b" => type d (the same thing: [textField insertText:@"d"])
"acd|-b" => change cursor
"ac|d-b" => type backspace (use a [textField deleteBackward])
"a|d-b" => type backspace
"|d-b" => *result* (Work!!!)
您不能更改光标,但是对于普通键入它可以解决问题!
You can't change the cursor, but for normal typing it solve the problems!.
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