以这个5*2二维数组为列
NSArray *array = @[
                       @[@"11", @"12"],
                       @[@"21", @"22"],
                       @[@"31", @"32"],
                       @[@"41", @"42"],
                       @[@"51", @"52"]];
1.二维数组倒置（即变为2*5二维数组）
NSArray *tmpArray = array[0];
   NSMutableArray *newArray = [NSMutableArray arrayWithCapacity:tmpArray.count];
   for (NSInteger i=0; i<tmpArray.count; i++) {
       NSMutableArray *lineArray = [NSMutableArray arrayWithCapacity:array.count];
       for (NSInteger j=0; j<array.count; j++) {
           [lineArray addObject:@"0"];
       [newArray addObject:lineArray];
   for (NSInteger i=0; i<array.count; i++) {
       for (NSInteger j=0; j<tmpArray.count; j++) {
           newArray[j][i] = array[i][j];
   NSLog(@"**********____%@", newArray);
打印结果如下：
2.二维数组转一维数组（即包含2*5个元素的一维数组）
NSArray *tmpArray = array[0];
    NSMutableArray *secArray = [NSMutableArray arrayWithCapacity:(tmpArray.count*array.count)];
    for (NSInteger i=0; i<(tmpArray.count*array.count); i++) {
        [secArray addObject:@"0"];
    NSInteger count = array.count;
    for (NSInteger i=0; i<secArray.count; i++) {
        secArray[i] = array[i%count][i/count];
    NSLog(@"**********----%@",secArray);
打印结果如下：
NSInteger count = tmpArray.count;
    for (NSInteger i=0; i<secArray.count; i++) {
        secArray[i] = array[i/count][i%count];
    NSLog(@"**********----%@",secArray);
打印结果如下：
//    n = X % 2;    m、n 代表数组下标
代码如下。。。紧接上面
 NSMutableArray *transferArray = [NSMutableArray arrayWithCapacity:5];
    for (NSInteger i=0; i<5; i++) {
        NSMutableArray *tmpArray = [NSMutableArray array];
        for (NSInteger j=0; j<2; j++) {
            [tmpArray addObject:@"0"];
        [transferArray addObject:tmpArray];
    for (NSInteger i=0; i<secArray.count; i++) {
        transferArray[i/2][i%2] = secArray[i];
    NSLog(@"**********----%@",transferArray);
打印结果如下