Question

我是iOS开发的新手，并且无法将字典对象数组写入文件。

这是我的代码......以及我认为它应该在下面做什么：

    // Step 1.  Copy the plist in the App bundle and create one in the Documents directory

NSError *error;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *path = [documentsDirectory stringByAppendingPathComponent:@"Devices.plist"];

NSFileManager *fileManager = [NSFileManager defaultManager];

if (![fileManager fileExistsAtPath: path])
{
    NSString *bundle = [[NSBundle mainBundle] pathForResource:@"Devices" ofType:@"plist"];

    [fileManager copyItemAtPath:bundle toPath: path error:&error];
}



// Step 2). Read my plist into a number of internal arrays.

NSArray *rootArray = [NSArray arrayWithContentsOfFile:path];

nameArray           = [[NSMutableArray alloc] init];
MACArray            = [[NSMutableArray alloc] init];
imageArray          = [[NSMutableArray alloc] init];
blockArray          = [[NSMutableArray alloc] init];
synchronisedArray   = [[NSMutableArray alloc] init];


for (NSDictionary *itemData in rootArray)
{
    [nameArray addObject:[itemData objectForKey:@"name"]];
    [MACArray addObject:[itemData objectForKey:@"MAC"]];
    [imageArray addObject:[itemData objectForKey:@"image"]];
    [blockArray addObject:[itemData objectForKey:@"block"]];
    [synchronisedArray addObject:[itemData objectForKey:@"synchronised"]];
}



// Step 3. Load my internal arrays into an array of dictionaries.

NSMutableDictionary *outData = [[NSMutableDictionary alloc] init];
NSMutableArray *outArray = [[NSMutableArray alloc] init];

for (int i = 0; i<[nameArray count]; i++)
{
    [outData removeAllObjects];

    [outData setValue:[nameArray objectAtIndex:i]         forKey:@"name"];
    [outData setValue:[MACArray objectAtIndex:i]          forKey:@"MAC"];
    [outData setValue:[imageArray objectAtIndex:i]        forKey:@"image"];
    [outData setValue:[blockArray objectAtIndex:i]        forKey:@"block"];
    [outData setValue:[synchronisedArray objectAtIndex:i] forKey:@"synchronised"];


    [outArray addObject: outData];

    NSLog(@"Last object in outArray at %i is %@", i, [outArray objectAtIndex:i]);
    NSLog(@"---------------------------");
}


// Step 4). Write the array back out to the plist.

BOOL result = [outArray writeToFile: path atomically:YES];

if (result)
    NSLog(@"Result YES");
else
    NSLog(@"Result NO");

说明：

1）。从App捆绑包中读取plist，然后直接将其复制到Documents中（以便稍后我可以写入）。

2）。读入新创建的plist，并将其加载到许多NSMutableArray对象中。

...此处的主程序代码（本例略）。

3）。读取内部数组并创建NSDictionary对象，将每个对象添加到NSMutableArray（outArray）。

4）。将outArray写入plist。

除最后一步外，一切正常。当我查看plist时，有3个条目符合预期......但是......它们都是一样的。它们是outArray中最后一个条目的副本。

这是NSLog输出：

2014-07-27 09:19:29.533 Filter[7143:60b] Last object in outArray at 0 is {
    MAC = "00:26:B0:CF:48:32";
    block = 0;
    image = "laptop-50";
    name = Laptop;
    synchronised = 1;
}
2014-07-27 09:19:29.537 Filter[7143:60b] ---------------------------
2014-07-27 09:19:29.539 Filter[7143:60b] Last object in outArray at 1 is {
    MAC = "00:26:B0:CF:48:32";
    block = 0;
    image = "joystick-50";
    name = PS3;
    synchronised = 0;
}
2014-07-27 09:19:29.540 Filter[7143:60b] ---------------------------
2014-07-27 09:19:29.541 Filter[7143:60b] Last object in outArray at 2 is {
    MAC = "B8:FF:61:09:BC:EE";
    block = 1;
    image = "ipad_copyrighted-50";
    name = "Logan's iPad";
    synchronised = 1;
}
2014-07-27 09:19:29.542 Filter[7143:60b] ---------------------------
2014-07-27 09:19:29.593 Filter[7143:60b] Result YES

感谢任何帮助/建议......谢谢。

Answer 1

在您编写时，您的现有密钥将被新值覆盖。请使用此

替换上述代码

// Step 3. Load my internal arrays into an array of dictionaries.


NSMutableArray *outArray = [[NSMutableArray alloc] init];

    for (int i = 0; i<[nameArray count]; i++)
    {
         NSMutableDictionary *outData = [[NSMutableDictionary alloc] init]; //add this line here

        [outData setValue:[nameArray objectAtIndex:i]         forKey:@"name"];
        [outData setValue:[MACArray objectAtIndex:i]          forKey:@"MAC"];
        [outData setValue:[imageArray objectAtIndex:i]        forKey:@"image"];
        [outData setValue:[blockArray objectAtIndex:i]        forKey:@"block"];
        [outData setValue:[synchronisedArray objectAtIndex:i] forKey:@"synchronised"];


        [outArray addObject: outData];

        NSLog(@"Last object in outArray at %i is %@", i, [outArray objectAtIndex:i]);
        NSLog(@"---------------------------");
    }

pList writeToFile字典数组 - 只写入最后一个数组条目

1 个答案: