[英]How to copy one NSMutablearray to another NSMutablearray?
[英]How to copy a NSMutableArray in to another array?
我試圖將一個數組復制到另一個數組,我的代碼如下
NSMutableArray firstArray = [[NSMutableArray alloc]init];
NSMutableArray secondArray = [[NSMutableArray alloc]init];
[firstArray addObject:@"1"];
[firstArray addObject:@"2"];
[firstArray addObject:@"3"];
[firstArray addObject:@"4"];
[firstArray addObject:@"5"];
// have tried following ways
// 1
secondArray=[firstArray copy];
// 2
[secondArray addObjectsFromArray:firstArray];
//3
secondArray = [[NSMutableArray alloc]initWithArray:firstArray];
它工作正常,但問題是,修改firstArray時它反映了它在secondArray中的更改,我不希望這樣。
請告訴您正確的方法
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