Question

我有两个NSMutableDictionaries

// ServiceResponse是NSMutableDictionary

     NSMutableDictionary *LocalDict=[[NSMutableDictionary alloc]initWithDictionary:serviceResponse];

当我在LocalDict中做了一些更改时，ServiceResponse也在改变。我认为LocalDict正在引用serviceResponse.i做了很多改动，但无法解决这个问题。请告诉我如何解决这个问题。为什么在serviceResponse中发生了变化。

            if ([[[serviceResponse valueForKey:@"GetAllDetailsResult"]objectAtIndex:0]valueForKey:@"Products"]!=[NSNull null]) {
                if ([[[[serviceResponse valueForKey:@"GetAllDetailsResult"]objectAtIndex:0]valueForKey:@"Products"]count]>0) {
                    if ([[[[[serviceResponse valueForKey:@"GetAllDetailsResult"]objectAtIndex:0]valueForKey:@"Products"] objectAtIndex:0]valueForKey:@"OutputProductsDetails"]!=[NSNull null]) {

                        NSMutableDictionary *LocalDict=[[NSMutableDictionary alloc]initWithDictionary:serviceResponse];


                        for (int j=0; j< [[[[[[LocalDict valueForKey:@"GetAllDetailsResult"]objectAtIndex:0]valueForKey:@"Products"] objectAtIndex:0]valueForKey:@"OutputProductsDetails"] count] ;j++) {

                            for (int i=1; i<=5; i++) {

                                NSURL * imageURL = [NSURL URLWithString:[[[[[[[LocalDict valueForKey:@"GetAllDetailsResult"]objectAtIndex:0]valueForKey:@"Products"] objectAtIndex:0]valueForKey:@"OutputProductsDetails"]objectAtIndex:j] valueForKey:[NSString stringWithFormat:@"ThumbNailImage%d",i]]];

                                if (![[imageURL absoluteString]isEqualToString:@""]) {

                                    NSData * imageData = [[NSData alloc] initWithContentsOfURL:imageURL];

                                    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
                                    NSString *documentsDirectory = [paths objectAtIndex:0];
                                    NSString *savedImagePath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%@%d.png",[[[[[[[LocalDict valueForKey:@"GetAllDetailsResult"]objectAtIndex:0]valueForKey:@"Products"] objectAtIndex:0]valueForKey:@"OutputProductsDetails"]objectAtIndex:j] valueForKey:@"ProductID"],i]];

                                    [imageData writeToFile:savedImagePath atomically:NO];

                                    [[[[[[[LocalDict valueForKey:@"GetAllDetailsResult"]objectAtIndex:0]valueForKey:@"Products"] objectAtIndex:0]valueForKey:@"OutputProductsDetails"]objectAtIndex:j]setValue:savedImagePath forKey:[NSString stringWithFormat:@"ThumbNailImage%d",i]];

                                }

                            }
                        }


                        [dbManager insertProductsDetails:[[[[[LocalDict valueForKey:@"GetAllDetailsResult"]objectAtIndex:0]valueForKey:@"Products"] objectAtIndex:0]valueForKey:@"OutputProductsDetails"]];

                    }
                }                    
            }

            /*
             *  Favourites details
             */
            if ([[[serviceResponse valueForKey:@"GetAllDetailsResult"]objectAtIndex:0]valueForKey:@"Favourite"]!=[NSNull null]) {
                if ([[[[serviceResponse valueForKey:@"GetAllDetailsResult"]objectAtIndex:0]valueForKey:@"Favourite"]count]>0) {
                    if ([[[[[serviceResponse valueForKey:@"GetAllDetailsResult"]objectAtIndex:0]valueForKey:@"Favourite"] objectAtIndex:0]valueForKey:@"OutputProductsDetails"]!=[NSNull null]) {
                        [dbManager insertFavouritesDetails:[[[serviceResponse valueForKey:@"GetAllDetailsResult"]objectAtIndex:0]valueForKey:@"Favourite"]];
                    }
                }                    
            }

            /*
             *  Rep Details
             */
            if ([[[serviceResponse valueForKey:@"GetAllDetailsResult"]objectAtIndex:0]valueForKey:@"RepDetails"]!=[NSNull null]) {
                if ([[[[serviceResponse valueForKey:@"GetAllDetailsResult"]objectAtIndex:0]valueForKey:@"RepDetails"]count]>0) {
                    if ([[[[[serviceResponse valueForKey:@"GetAllDetailsResult"]objectAtIndex:0]valueForKey:@"RepDetails"] objectAtIndex:0]valueForKey:@"OutputProductsDetails"]!=[NSNull null]) {
                        [dbManager insertRepUserDetails:[[[serviceResponse valueForKey:@"GetAllDetailsResult"]objectAtIndex:0]valueForKey:@"RepDetails"]];
                    }
                }
            }

Answer 1

试试这个

 NSMutableDictionary *LocalDict=[[[NSMutableDictionary alloc]initWithDictionary:serviceResponse] mutableCopy];

注意：它会生成浅色副本。它不会在你的可变字典中创建不可变对象。

希望有所帮助。

Answer 2

这个答案可以通过深层复制解决您的问题

how to do true deep copy for NSArray and NSDictionary with have nested arrays/dictionary?

这是一个很好的类别

@implementation NSDictionary (SPDeepCopy)

- (NSDictionary*) deepCopy {
    unsigned int count = [self count];
    id cObjects[count];
    id cKeys[count];

    NSEnumerator *e = [self keyEnumerator];
    unsigned int i = 0;
    id thisKey;
    while ((thisKey = [e nextObject]) != nil) {
        id obj = [self objectForKey:thisKey];

        if ([obj respondsToSelector:@selector(deepCopy)])
            cObjects[i] = [obj deepCopy];
        else
            cObjects[i] = [obj copy];

        if ([thisKey respondsToSelector:@selector(deepCopy)])
            cKeys[i] = [thisKey deepCopy];
        else
            cKeys[i] = [thisKey copy];

        ++i;
    }

    NSDictionary *ret = [[NSDictionary dictionaryWithObjects:cObjects forKeys:cKeys count:count] retain];

    // The newly-created dictionary retained these, so now we need to balance the above copies
    for (unsigned int i = 0; i < count; ++i) {
        [cObjects[i] release];
        [cKeys[i] release];
    }

    return ret;
}
- (NSMutableDictionary*) mutableDeepCopy {
    unsigned int count = [self count];
    id cObjects[count];
    id cKeys[count];

    NSEnumerator *e = [self keyEnumerator];
    unsigned int i = 0;
    id thisKey;
    while ((thisKey = [e nextObject]) != nil) {
        id obj = [self objectForKey:thisKey];

        // Try to do a deep mutable copy, if this object supports it
        if ([obj respondsToSelector:@selector(mutableDeepCopy)])
            cObjects[i] = [obj mutableDeepCopy];

        // Then try a shallow mutable copy, if the object supports that
        else if ([obj respondsToSelector:@selector(mutableCopyWithZone:)])
            cObjects[i] = [obj mutableCopy];

        // Next try to do a deep copy
        else if ([obj respondsToSelector:@selector(deepCopy)])
            cObjects[i] = [obj deepCopy];

        // If all else fails, fall back to an ordinary copy
        else
            cObjects[i] = [obj copy];

        // I don't think mutable keys make much sense, so just do an ordinary copy
        if ([thisKey respondsToSelector:@selector(deepCopy)])
            cKeys[i] = [thisKey deepCopy];
        else
            cKeys[i] = [thisKey copy];

        ++i;
    }

    NSMutableDictionary *ret = [[NSMutableDictionary dictionaryWithObjects:cObjects forKeys:cKeys count:count] retain];

    // The newly-created dictionary retained these, so now we need to balance the above copies
    for (unsigned int i = 0; i < count; ++i) {
        [cObjects[i] release];
        [cKeys[i] release];
    }

    return ret;
}

@end

Answer 3

我试过这个，它解决了我的问题。每一个人都有他们的建议和帮助。

                NSData *buffer;
                  NSMutableDictionary *dictLocal;

                        // Deep copy "all" objects in _dict1 pointers and all to _dict2
                buffer = [NSKeyedArchiver archivedDataWithRootObject: serviceResponse];
                dictLocal = [NSKeyedUnarchiver unarchiveObjectWithData: buffer];

将一个NSMutableDictiory分配给给出prob的另一个NSMutableDictionary

3 个答案: