iOS基础一 Copy

最新推荐文章于 2024-08-11 17:51:07 发布

lawlielt

最新推荐文章于 2024-08-11 17:51:07 发布

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分类专栏： iOS 文章标签： iOS基础 iOS Copy 数组复制 mutableCopy

本文链接：https://blog.youkuaiyun.com/lawlielt_liu/article/details/22218159

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/**
         *  copy
         */
        
        NSMutableArray *dataArray_copy = [NSMutableArray arrayWithObjects:@"one",@"two",@"three",@"four", nil];
        NSMutableArray *dataArray2_copy;
        
        //simple assignment
        dataArray2_copy = dataArray_copy;
        [dataArray2_copy removeObjectAtIndex:0];
        
        NSLog(@"dataArray:");
        for(NSString *element in dataArray_copy)
            NSLog(@"%@",element);
        NSLog(@"dataArray2:");
        for(NSString *element in dataArray2_copy)
            NSLog(@"%@",element);
        
        //try a copy, then remove the first element from the copy
        dataArray2_copy = [dataArray_copy mutableCopy];
        [dataArray2_copy removeObjectAtIndex:0];
        NSLog(@"dataArray:");
        for(NSString *element in dataArray_copy)
            NSLog(@"%@",element);
        NSLog(@"dataArray2:");
        for(NSString *element in dataArray2_copy)
            NSLog(@"%@",element);
        
        
        NSMutableArray *dataArray = [NSMutableArray arrayWithObjects:[NSMutableString stringWithString:@"one"],
                                     [NSMutableString stringWithString:@"two"],[NSMutableString stringWithString:@"thress"], nil];
        NSMutableArray *dataArray2;
        NSMutableString *mStr;
        NSLog(@"dataArray: ");
        for(NSString *element in dataArray)
            NSLog(@"%@",element);
        dataArray2 = dataArray;
        mStr = [dataArray objectAtIndex:0];
        [mStr appendString:@"ONE"];
        NSLog(@"dataArray:");
        for(NSString *elment in dataArray)
            NSLog(@"%@",elment);
        NSLog(@"dataArray2:");
        for(NSString *element in dataArray2)
            NSLog(@"%@",element);