自定义键盘iPhone，UITextView中的退格按钮出现问题 [英] Custom keyboard iphone , having problem with backspace button in UITextView

问题描述

检查此代码(我的自定义键盘"):

Check this code (My Custom Keyboard):

-(IBAction) updateTextBackSpace:(id)sender
{
    if([txtview.text length]>0)
    {
        NSString *deletedLastCharString = [txtview.text substringToIndex:([txtview.text length]-1)];
        [txtview setText:deletedLastCharString];
    }
    else
    {
        return nil;
    }
}  

问题是我不知道如何更改此代码.我可以删除光标处任何给定行中的任何文本，退格键从行尾开始删除.我应该能够从光标位置擦除(退格).

The thing is that I can't figure out how to change this code so that. I can erase any text in any give line at the cursor, the backspace starts to erase from end of the line. I should be able to erase(backspace) from the cursor location.

推荐答案

替换此

NSString *deletedLastCharString = [txtview.text substringToIndex:([txtview.text length]-1)];

与

NSRange range  = [txtview selectedRange];
NSString *deletedLastCharString = [txtview.text substringToIndex:([range.location]-1)];

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