Tenn's WorkSpace

    ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];

    // Enumerate just the photos and videos group by using ALAssetsGroupSavedPhotos.

    [library enumerateGroupsWithTypes:ALAssetsGroupSavedPhotos usingBlock:^(ALAssetsGroup *group, BOOL *stop) {

        // Within the group enumeration block, filter to enumerate just photos.

        [group setAssetsFilter:[ALAssetsFilter allPhotos]];

        // Chooses the photo at the last index

        [group enumerateAssetsAtIndexes:[NSIndexSet indexSetWithIndex:([group numberOfAssets] - 1)] options:0 usingBlock:^(ALAsset *alAsset, NSUInteger index, BOOL *innerStop) {

            // The end of the enumeration is signaled by asset == nil.

            if (alAsset) {

                ALAssetRepresentation *representation = [alAsset defaultRepresentation];

                UIImage *latestPhoto = [UIImage imageWithCGImage:[representation fullScreenImage]];

                [latestPhoto resizeImageToWidth:50];

                if (latestPhoto){

                    [self.imgBtn setBackgroundImage:latestPhoto forState:UIControlStateNormal];

                    [self.imgBtn setBackgroundImage:latestPhoto forState:UIControlStateHighlighted];

                }

            }

        }];

    } failureBlock: ^(NSError *error) {

    }];

NSArray *array = [NSArray arrayWithObjects:@"1",@"2",@"3", nil];

    NSMutableArray *dataArray = [NSMutableArray arrayWithArray:array];

    [dataArray addObject:@"4"];

    NSArray *array2 = [NSArray arrayWithObjects:@"5",@"6",@"7", nil];

    [dataArray addObjectsFromArray:array2];

    for(NSString *str in dataArray){

        NSLog(@"%@", str);

    }

결과

2013-12-25 14:38:54.899 TestPrj[2030:70b] 1

2013-12-25 14:38:54.901 TestPrj[2030:70b] 2

2013-12-25 14:38:54.901 TestPrj[2030:70b] 3

2013-12-25 14:38:54.902 TestPrj[2030:70b] 4

2013-12-25 14:38:54.902 TestPrj[2030:70b] 5

2013-12-25 14:38:54.902 TestPrj[2030:70b] 6

2013-12-25 14:38:54.903 TestPrj[2030:70b] 7