notes

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text

{

if([text isEqualToString:@"\n"])

{

[textquestionendEditing:YES];

if(textquestion.text.length == 0)

[selfSetPlaceholder];

returnNO;

}

    if([text length]==0)

    {

        NSLog(@"yulang");

        NSRange range=[textquestion.textrangeOfString:@"@"options:NSBackwardsSearch];

        NSLog(@" location=%d,length=%d",range.location,range.length);

        NSString *str=[textquestion.textsubstringFromIndex:range.location];

        NSString *str1=[textquestion.textsubstringToIndex:range.location-1];

        if([str isEqual:@"@yu"])

            textquestion.text=str1;

    }

returnYES;

}

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notes

原文：http://www.cnblogs.com/yulang314/p/3677490.html