在NSArray中连接对象

Question

i have an array like this:

NSArray *arr = [[NSArray alloc]initWithObjects:@"1",@"2",@"3",@"4",@"5",@"6",nil];

how i can join the first element with the second and the third with the fourth and so on?

Answer 1

As I understand, it should result into @"12",@"34",@"56"

NSArray *arr = [NSArray arrayWithObjects:@"1",@"2",@"3",@"4",@"5",@"6",nil];

NSMutableArray *array2 = [NSMutableArray array];
[arr enumerateObjectsUsingBlock:^(NSString *string1, NSUInteger idx, BOOL *stop) {
    if (idx > 0 && idx %2 == 1) {
        NSString  *string0 = [arr objectAtIndex:idx-1];
        [array2 addObject:[NSString stringWithFormat:@"%@%@", string0, string1]];

    }
}];

NSLog(@"%@", array2);

result:

(
    12,
    34,
    56
)