NSDictionary to NSArray

Question

i have a NSDictionary which looks like      Item1    2 4   Item2    5 5   Item3    15 6      To use this NSDictionary Items in a Table View i have to transfer it to a NSArray  am i right   So i try   NSDictionary  dict    myDict objectForKey   items     for  id item in dict          myArray addObject  dict objectForKey item        But  myArray keeps empty  What am i doing wrong

User · Answer

You just need to initialize your NSMutableArray   NSMutableArray   myArray     NSMutableArray alloc  init

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You can create an array of all the objects inside the dictionary and then use it as a datasource for the TableView   NSArray  aValuesArray    yourDict allValues

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NSArray  keys    dictionary allKeys   NSArray  values    dictionary allValues

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There are a few things that could be happening here   Is the dictionary you have listed the myDict   If so  then you don t have an object with a key of   items   and the dict variable will be nil   You need to iterate through myDict directly   Another thing to check is if  myArray is a valid instance of an NSMutableArray   If it s nil  the addObject  method will silently fail   And a final thing to check is that the objects inside your dictionary are properly encased in NSNumbers  or some other non-primitive type

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Leaving aside the technical issues with the code you posted  you asked this      To use this Dictionary Items in a Table View i have to transfer it to a NSArray  am i right    The answer to which is  not necessarily  There s nothing intrinsic to the machinery of UITableView  UITableViewDataSource  or UITableViewDelegate that means that your data has to be in an array  You will need to implement various methods to tell the system how many rows are in your table  and what data appears in each row  Many people find it much more natural and efficient to answer those questions with an ordered data structure like an array  But there s no requirement that you do so  If you can write the code to implement those methods with the dictionary you started with  feel free

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NSArray   getArrayListFromDictionary  NSDictionary   dictMain paramName  NSString   paramName       if  dictMain isKindOfClass  NSDictionary class                  if   dictMain objectForKey paramName                         if    dictMain objectForKey paramName  isKindOfClass  NSArray class                                  NSArray  dataArray    dictMain objectForKey paramName                    return dataArray                                    return   NSArray alloc  init       Hope this helps

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In Swift 4   let dict     Item1  2 4   Item2   5 4   Item3    6 5   let array   Array dict values

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NSArray   values    dictionary allValues

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To get all objects in a dictionary  you can also use enumerateKeysAndObjectsUsingBlock  like so   NSMutableArray  yourArray    NSMutableArray arrayWithCapacity 6    yourDict enumerateKeysAndObjectsUsingBlock   id key  id obj  BOOL  stop         yourArray addObject obj

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This code is actually used to add values to the dictionary and through the data to an Array According to the Key   NSMutableArray  arr     NSMutableArray alloc init   NSDictionary  dicto     NSMutableDictionary alloc initWithObjectsAndKeys   Hello    StackOverFlow    Key1    StackExchange    Key2   nil   NSLog   The dictonary is        dicto   arr    dicto valueForKey   Key1    NSLog   The array is        arr

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Code Snippet1    NSMutableArray  array     NSMutableArray alloc  init   NSArray   values    dictionary allValues    array addObject values     Code Snippet2  If you want to add further   array addObject value1    array addObject value2    array addObject value3     And so on  Also you can store key values of dictionary to array  NSArray  keys    dictionary allKeys

[objective-c] NSDictionary to NSArray?

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