String To Number

- (void)viewDidLoad {
    [super viewDidLoad];

    NSString *orString = @"111123";
    
    
    NSLog(@"========%d",[self retureTureState:orString]);
    
    
}

-(int)retureTureState:(NSString *)inputStr{
    int sum = 0;
    int b = 1;
    for (int i = (int)inputStr.length - 1; i>= 0; i--) {
        char *s =  (char *)[inputStr characterAtIndex:i];
        if ( s >= '0' && s<= '9') {
            if (i == inputStr.length - 1) {
                
            }else{
                b = b*10;
            }
            sum += (int)(s-'0')*b;
        }else{
            return 0;
        }
    }
    return sum;
}

========111123