-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
    if (textField.tag == 1001) {
        NSInteger strLength = textField.text.length - range.length + string.length;
        if (strLength > 11){
            return NO;
        }
        NSString *text = nil;
        //如果string为空，表示删除
        if (string.length > 0) {
            text = [NSString stringWithFormat:@"%@%@",textField.text,string];
        }else{
            text = [textField.text substringToIndex:range.location];
        }
        if ([self isMobile:text]) {
            [btnVeriy setEnabled:YES];
        }else{
            [btnVeriy setEnabled:NO];
        }
    }
    return YES;
}