iOS字符串转数组，数组转字符串

    NSArray *arrays = @[@"1,2,3,4,5,6"];

    NSString *string = [arrays componentsJoinedByString:@","];

    NSArray *array = [string componentsSeparatedByString:@","];

    NSLog(@"=string=--- %@",string);

    NSLog(@"=array=--- %@",array);