输入手机号 实现自动三 四 四格式

用的是空格，如果用- 把空格换成- 就OK

#define NUMBERS @"0123456789"

//键盘改变，控制变更
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
    
    NSCharacterSet*cs;
    cs = [[NSCharacterSet characterSetWithCharactersInString:NUMBERS] invertedSet];
    NSString*filtered = [[string componentsSeparatedByCharactersInSet:cs] componentsJoinedByString:@""];
    BOOL basicTest = [string isEqualToString:filtered];

    NSInteger existedLength = textField.text.length;
    NSInteger selectedLength = range.length;
    NSInteger replaceLength = string.length;
    
    if (existedLength - selectedLength + replaceLength >14) {
        return NO;
    }

    
    if(basicTest)
    {
        if (textField == phoneTxtField)
        {

            if ([string isEqualToString:@""]){ // 删除字符
                if (((textField.text.length - 2) % 4 == 0) &&((textField.text.length - 2) % 6 != 0)) {
                    textField.text = [textField.text substringToIndex:textField.text.length - 1];
                }else if ((textField.text.length - 2) % 9 == 0){
                    textField.text = [textField.text substringToIndex:textField.text.length - 1];
                }
                return YES;
            } else {
                if (textField.text.length<5) {
                    if (textField.text.length % 4 == 0) {
                        textField.text = [NSString stringWithFormat:@"%@ ", textField.text];
                    }
                }else{
                    if (textField.text.length % 9 == 0) {
                    textField.text = [NSString stringWithFormat:@"%@ ", textField.text];
                }
                }
                
            }
            return YES;
        }
    }
    else
    {
        return NO;
    }
    
    
    if (string.length == 0) {
        
        return YES;
    }
    
    
    return YES;
    

    
}


//键盘关闭
-(void)textFieldDidEndEditing:(UITextField *)textField
{
    if ((textField == phoneTxtField) &&(textField.text.length==14) ){
       NSLog(@"输入了九位");

       

 userPhone=[phoneTxtField.text stringByReplacingOccurrencesOfString:@" " withString:@""];

        NSLog(@"%@",userPhone);

    }
}