"Code note" adds a 400 call to the middle-line

One, code.

-(void) viewdidload{    [Super Viewdidload];    Do any additional setup after loading the view.        NSLog (@ "--iphone--%@", [Self getnewphonestr1:@ "18502368888"]);    } #pragma-mark-functions//only need to pass a phone call in, you can return a processed add-line 400 phone string, such as 4001234567, return 400-123-4567-(NSString *) GETNEWPHONESTR1: (NSString *) phonestr{    if ([Phonestr rangeofstring:@ "-"].length = = 0 && phonestr.length > 6) {        nsmutablestring *phonenumber = [nsmutablestring string];        NSString *substr = [Phonestr substringtoindex:3];        [PhoneNumber appendformat:@ "%@-", subStr];        SUBSTR = [Phonestr substringwithrange:nsmakerange (3, 3)];        [PhoneNumber appendformat:@ "%@-", subStr];        SUBSTR = [Phonestr substringwithrange:nsmakerange (6, phonestr.length-6)];        [PhoneNumber Appendstring:substr];                Phonestr = PhoneNumber;    }        return PHONESTR;}

Two, output.

2015-10-19 13:52:46.387 400 telephones in the middle plus-line [6123:140629]--iphone--185-023-68888

"Code note" adds a 400 call to the middle-line