UITextView计算字数,限制字数

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要做字数限制，网上看了一些，都不是很好用，要不就是不能同时兼顾ios6,7 。在textViewDidChange：事件进行添加

- (void)textViewDidChange:(UITextView *)textView{    if(![textView markedTextRange])    {        if(textView.text.length > 20)        {            UIAlertView *alter_view = [[UIAlertView alloc] initWithTitle:@"内容过长" message:nil delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];            [alter_view show];            textView.text = [textView.text substringToIndex:20];        }        NSLog(@"%@",[NSString stringWithFormat:@"%d/20",textView.text.length]);        //_label_textCount.text = [NSString stringWithFormat:@"%d/20",textView.text.length];    }}

另外附上点击回收键盘

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text{    if ([text isEqualToString:@"\n"] && ![textView markedTextRange])    {        [textView resignFirstResponder];        return NO;    }    return YES;}

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