UITextField,UITextView字数限制

UITextField,UITextView字数限制

主要是使用他们的两个代理方法

//标题限制在 30个字以内

 - (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
        if (range.location>=30)
        {
            UIAlertView *alertNums = [[UIAlertView alloc]initWithTitle:@"输入提示" message:@"标题字数限制在30字以内！" delegate:self cancelButtonTitle:nil otherButtonTitles:@"确定", nil];
            [alertNums show];
            return  NO;
        }
        else
        {
            return YES;
        }
   
}
//内容限制在100个字以内;

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
    if (range.location>=100)
    {
        UIAlertView *alertNums = [[UIAlertView alloc]initWithTitle:@"输入提示" message:@"内容限制在100字以内！" delegate:self cancelButtonTitle:nil otherButtonTitles:@"确定", nil];
        [alertNums show];
        return  NO;
    }
    else
    {
        return YES;
    }
}