ios 数组倒序和数组转字符串

  NSMutableArray *array = [NSMutableArray arrayWithObjects:@"",@"",@"",nil];
    NSArray* reversedArray = [[array reverseObjectEnumerator] allObjects];
    NSLog(@"%@",reversedArray);

    NSArray *array1 = [NSArray arrayWithObjects:@"one",@"two",@"three", nil];
    NSString *string = [array1 componentsJoinedByString:@","];
    NSLog(@"string:%@",string);