ios - 以编程方式将字典添加到 Plist

Question

我正在尝试以下列格式以编程方式将字典添加到 plist:

根(字典)|StringOfViewID(字典)|按钮标题(字典)|字符串字符串

我可以成功做到这一点，但我想在同一个 ViewID(Dict) 下继续向 ViewID(Dict) 添加更多 ButtonTitle(Dict)。

到目前为止，我只能替换现有的。

像这样:

根(字典)|StringOfViewID(Dict) - ButtonTitle(Dict)(2)-String 字符串|按钮标题(字典)(1)|字符串字符串

这是我使用的代码:

//Initialize and load the plist file here: 
[...]
            NSMutableDictionary *data;
            NSMutableDictionary *viewID;
            NSMutableDictionary *buttonName;
            NSArray *keys;
            NSArray *locations;


        // Insert the data into the plist

        NSNumber *xNumber = [[NSNumber alloc] initWithDouble:locationX];
        NSNumber *yNumber = [[NSNumber alloc] initWithDouble:locationY];

        keys = [NSArray arrayWithObjects:@"locationX", @"locationY", nil];
        locations = [NSArray arrayWithObjects:xNumber, yNumber, nil];
        data = [NSMutableDictionary dictionaryWithObjects:locations forKeys:keys];
        buttonName = [NSMutableDictionary dictionaryWithObject:data forKey:myButtonTitle];
        viewID = [NSMutableDictionary dictionaryWithObject:buttonName forKey:@"StringOfViewID"];

        [viewID writeToFile:path atomically:YES];

谢谢

Answer 1

只需先将文件加载到 NSMutableDictionary 中，对其进行所需的更改，然后使用您已经使用的相同代码将其写回到文件中。

编辑:关于你用于编辑列表的结构，你可以有一个按钮字典数组

   NSMutableDictionary* oldDictionary=[NSMutableDictionary dictionaryWithContentsOfFile:path];

   // make the new button dictionary
   NSNumber *xNumber = [[NSNumber alloc] initWithDouble:locationX];
   NSNumber *yNumber = [[NSNumber alloc] initWithDouble:locationY];

   NSDictionary*buttonDictionary=@{@"locationX": xNumber,
                                   @"locationY":yNumber,
                                   @"myButtonTitle":myButtonTitle};
   NSMutableArray *buttonsArray = [oldDictionary objectForKey:@"StringOfViewID"];
   //append it to the array
   [buttonsArray addObject:buttonDictionary];
   //replace the old array with the new one
   [oldDictionary setObject:buttonsArray forKey:@"StringOfViewID"];
   //write it back to the file
   [oldDictionary writeToFile:path atomically:YES];

或者按钮字典的字典

    NSMutableDictionary* oldDictionary=[NSMutableDictionary dictionaryWithContentsOfFile:path];

    // make the new button dictionary
    NSNumber *xNumber = [[NSNumber alloc] initWithDouble:locationX];
    NSNumber *yNumber = [[NSNumber alloc] initWithDouble:locationY];

    NSDictionary*buttonLocationDictionary=@{@"locationX": xNumber, @"locationY":yNumber};
    NSMutableDictionary *buttonsDictionary = [oldDictionary objectForKey:@"StringOfViewID"];
    //add it to the dictionary
    [buttonsDictionary  setObject:buttonLocationDictionary forKey:myButtonTitle];//be sure that this is a new button title,or else it will replace the old value with this title.

    //replace the old dictionary with the new one
    [oldDictionary setObject:buttonsDictionary forKey:@"StringOfViewID"];
    //write it back to the file
    [oldDictionary writeToFile:path atomically:YES];

我尽量不更改您正在使用的结构或键，并且我假设 StringOfViewID 是当前感兴趣 View 中所有按钮将具有的键，其他 View 将具有其他键。