是否有任何内置功能允许我深度复制NSMutableArray？
我环顾四周，有人说[aMutableArray copyWithZone:nil]件作品是深度复制.但我试过了，它似乎是一个肤浅的副本.
现在我正在用for循环手动复制:
//deep copy a 9*9 mutable array to a passed-in reference array
-deepMuCopy : (NSMutableArray*) array
toNewArray : (NSMutableArray*) arrayNew {
[arrayNew removeAllObjects];//ensure it's clean
for (int y = 0; y<9; y++) {
[arrayNew addObject:[NSMutableArray new]];
for (int x = 0; x<9; x++) {
[[arrayNew objectAtIndex:y] addObject:[NSMutableArray new]];
NSMutableArray *aDomain = [[array objectAtIndex:y] objectAtIndex:x];
for (int i = 0; i<[aDomain count]; i++) {
//copy object by object
NSNumber* n = [NSNumber numberWithInt:[[aDomain objectAtIndex:i] intValue]];
[[[arrayNew objectAtIndex:y] objectAtIndex:x] addObject:n];
}
}
}
}
但我想要一个更干净、更简洁的解决方案.