iOS 深淺拷貝

標籤：

-(void)copyDemo{//    在非集合類對象中：對immutable對象進行copy操作，是指標複製，mutableCopy操作時內容複寫；對mutable對象進行copy和mutableCopy都是內容複寫。用代碼簡單表示如下：//    //    [immutableObject copy] // 淺複製//    [immutableObject mutableCopy] //深複製//    [mutableObject copy] //深複製//    [mutableObject mutableCopy] //深複製    //    在集合類對象中，對immutable對象進行copy，是指標複製，mutableCopy是內容複寫；對mutable對象進行copy和mutableCopy都是內容複寫。但是：集合對象的內容複寫僅限於對象本身，對象元素仍然是指標複製。用代碼簡單表示如下：//    //    [immutableObject copy] // 淺複製//    [immutableObject mutableCopy] //單層深複製//    [mutableObject copy] //單層深複製//    [mutableObject mutableCopy] //單層深複製    //    Baby *baby = [[Baby alloc] init]; //必須實現copy方法//    baby.babyName = @"wei";        NSMutableDictionary *dic = [[NSMutableDictionary alloc] initWithCapacity:10];    [dic setObject:@"1" forKey:@"key1"];    NSMutableArray *array1 = [[NSMutableArray alloc] initWithObjects:dic,dic, nil];    NSMutableArray *array2 = [array1 mutableCopy];//單層深拷貝    NSMutableArray *array3 = [[NSMutableArray alloc] initWithArray:array1 copyItems:YES];//裡面dic變成不可變了    NSMutableArray* array4 = [NSKeyedUnarchiver unarchiveObjectWithData:                                  [NSKeyedArchiver archivedDataWithRootObject: array1]];//裡面dic改變不影響其他數組(其與方法都會影響其他數組)    [array2 removeObjectAtIndex:0];    [[array4 objectAtIndex:0] setObject:@"3" forKey:@"key1"];//    [[array4 objectAtIndex:1] setBabyName:@"8888"];        DLog(@"%@ \n %@ \n %@ \n %@",array1,array2,array3,array4);}

 

iOS 深淺拷貝