如何複製數組？

Question

我有四個陣列如下：

toArray = [[NSMutableArray alloc] initWithObjects:@"to 1",@"to 2",@"to 3",@"to 4",@"to 5",@"to 6",@"to 7",nil]; 
fromArray = [[NSMutableArray alloc] initWithObjects:@"from 1",@"from 2",@"from 3",@"from 4",@"from 5",@"from 6",@"from 7",nil]; 
messageArray = [[NSMutableArray alloc] initWithObjects:@"message 1",@"message 2",@"message 3",@"message 4",@"message 5",@"message 6",@"message 7",nil]; 
dayArray = [[NSMutableArray alloc] initWithObjects:@"day 1",@"day 2",@"day 3",@"day 4",@"day 5",@"day 6",@"day 7",nil]; 

我想複製或建立一個單一的陣列，其應該包含所有這4個陣列。 我該如何實現它？

Answer 1

你的問題有點含糊不清;你想要什麼結果？

NSMutableArray *completeArray = [NSMutableArray array]; 
[completeArray addObjectsFromArray:toArray]; 
[completeArray addObjectsFromArray:fromArray]; 
[completeArray addObjectsFromArray:messageArray]; 
[completeArray addObjectsFromArray:dayArray]; 

或者

NSMutableArray *completeArray = [NSMutableArray arrayWithObjects:toArray, fromArray, messageArray, dayArray, nil]; 

或者，如果所有陣列具有相同數量的元素：

NSMutableArray *completeArray = [NSMutableArray array]; 
for (NSUInteger i = 0; i < [toArray count]; i++) 
{ 
    NSString *fullString = [NSString stringWithFormat:@"%@ %@ %@ %@", [toArray objectAtIndex:i], [fromArray objectAtIndex:i], [messageArray objectAtIndex:i], [dayArray objectAtIndex:i]]; 
    [completeArray addObject:fullString]; 
} 

或者，作爲字典（也假定所有陣列是相同的長度）的數組：

NSMutableArray *completeArray = [NSMutableArray array]; 
for (NSUInteger i = 0; i < [toArray count]; i++) 
{ 
    NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys: 
     [toArray objectAtIndex:i], @"to", 
     [fromArray objectAtIndex:i], @"from", 
     [messageArray objectAtIndex:i], @"message", 
     [dayArray objectAtIndex:i], @"day", 
     nil]; 
    [completeArray addObject:dict]; 
} 

Answer 2

這應該工作：

NSArray *singleArray = [NSArray arrayWithElements:toArray, fromArray, messsageArray, dayArray, nil]; 
// mind the nil element at the end 

Answer 3

NSMutableArray *result = [NSMutableArray arrayWithCapacity:0]; 

[result addObjectsFromArray:toArray]; 
[result addObjectsFromArray:fromArray]; 
[result addObjectsFromArray:messageArray]; 
[result addObjectsFromArray:dayArray];