I have a very strange behaviour with NSArray.
Firstly, i parsed an XML file and return a valid NSArray with NSDictionary inside:
NSArray *arrayOfDict = [parser parseWithXMLFile:filename];
In debugger it's fully valid. Then, i want to proccess all dictionaries in this array:
NSMutableArray* arrayOfProducts = [[NSMutableArray alloc] init];
for (NSDictionary* dict in arrayOfDict) {
Product* product = [[Product alloc] initWithName:dict[#"name"]
type:dict[#"type"]
imageName:dict[#"image"]
description:dict[#"description"]];
[arrayOfProducts addObject:product];
[product release];
}
And in this loop is a problem: a dict variable has value nil. And i don't know what to do with this. In debugger i evaluate value of arrayOfDict[someIndex] and get a right value, but in the programm itself it doesn't work.
May be it's the problem with MRR, i don't feel myself confidenly while using MRR and there is a mistake of using it.
P.S. I know that using MRR is stupid today, but in this project i must use it.
Related
I have a NSMutabelArray and I want to do some additions inside of it. I do this by calling a functions with then create a subarray with the items where the calculations have to be done on.
- (NSDecimalNumber *)calculate:(NSMutableArray *)arrayToCalculate {
while ([arrayToCalculate containsObject:(#"+")]) {
NSUInteger signeLocation = [arrayToCalculate indexOfObject:(#"+")];
[arrayToCalculate replaceObjectAtIndex:(signeLocation-1)
withObject:([[arrayToCalculate objectAtIndex:(signeLocation-1)]
decimalNumberByAdding:[arrayToCalculate objectAtIndex:(signeLocation+1)]])];
[arrayToCalculate removeObjectsAtIndexes:
[NSIndexSet indexSetWithIndexesInRange:NSMakeRange((signeLocation), 2)]];
}
return [arrayToCalculate lastObject];
}
I initialised the arrayToCalculate by:
NSMutableArray *subArray =
[inputArray subarrayWithRange:(rangeOfCalculationItems)];
Every time I run this code it crashes. I am pretty sure it is bc I used subarray on an NSMutableArray and initialised it as NSMutableArray even when the message gives me back a NSArray, but I don't know how I could fix it or it is even the problem.
I copied your method and tested it like this:
NSArray *items = #[
[[NSDecimalNumber alloc] initWithString:#"1"],
#"+",
[[NSDecimalNumber alloc] initWithString:#"2"]
];
NSLog(#"%g", [self calculate: [items mutableCopy]].floatValue);
The code works and the printed result was 3. Your issue must be somewhere else. Are you sure your array is in fact mutable? Note [items mutableCopy].
I am using below function to check whether if an object in an array is present in another array. If the object not present, then I will ADD that object to the new array, or else that object will NOT be included in the new array that I instantiated.
+ (NSMutableArray *)loadUngroupedSpeakerList
{
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
NSMutableArray *speakerList = [[NSMutableArray alloc] init];
NSArray *speakerIDList = [userDefaults objectForKey:DATA_SPEAKER_IDLIST];
NSArray *speakerIDListGrouped = [userDefaults objectForKey:DATA_SPEAKER_IDLIST_GROUPED];
//**** this is for checking the contents of speakerIDListGrouped ****//
for(NSString *speakerID in speakerIDListGrouped)
{
NSLog(#"FLOWCHECK~ loadUngroupedSpeakerList check content:%#", speakerID);
}
for(NSString *speakerID in speakerIDList)
{
if(![speakerIDListGrouped containsObject:speakerID])
{
NSLog(#"FLOWCHECK~ loadUngroupedSpeakerList: speakerID: %#", speakerID);
NSDictionary *speakerDict = [userDefaults dictionaryForKey:[NSString stringWithFormat:#"%#%#", DATA_SPEAKER_DICT, speakerID]];
[speakerList addObject:speakerDict];
}
}
return speakerList;
}
In the above code, speakerList contains all the speakerIDs. While speakerIDListGrouped only contains the speakerIDs that are used in a group. My function needs to eliminate all the speakerIDs used in a group so I did it in a way just like the above code.
My Problem:
When I run the code, I notice that even if speakerIDListGrouped contains the object in speakerIDList, these two lines would still be executed
NSDictionary *speakerDict = [userDefaults dictionaryForKey:[NSString stringWithFormat:#"%#%#", DATA_SPEAKER_DICT, speakerID]];
[speakerList addObject:speakerDict];
Whereas to I understand, It should not happen. Because I only allowed them to be executed only if speakerIDList does not contain that object.
This is the log when I execute the code:
2015-06-15 19:31:24.849 soulbeats[1936:433953] FLOWCHECK~ loadUngroupedSpeakerList check content:72243140485836704
2015-06-15 19:31:24.850 soulbeats[1936:433953] FLOWCHECK~ loadUngroupedSpeakerList check content:7782687177520836128
2015-06-15 19:31:24.850 soulbeats[1936:433953] FLOWCHECK~ loadUngroupedSpeakerList: speakerID: 72243140485836704
2015-06-15 19:31:24.851 soulbeats[1936:433953] FLOWCHECK~ loadUngroupedSpeakerList: speakerID: 7782687177520836128
As can be seen, speakerIDListGrouped DOES contain the two objects. However, when I tried replacing the string inside the lower for loop by hardcoding it to one of the objects I printed on Log, which was 72243140485836704. The function now works properly, I mean it didn't execute the two lines I showed before.
I am now confused. What is the difference between the string I hardcoded and the one that was obtained from the array? The contents are the same.
Many Thanks!
I did the same thing it is working fine...
NSMutableArray *speakerList = [[NSMutableArray alloc] init];
NSArray *speakerIDList = #[#"a",#"b",#"c",#"d",#"e"];
NSArray *speakerIDListGrouped =#[#"a",#"b",#"f",#"g",#"h"];
for(NSString *speakerID in speakerIDListGrouped)
{
NSLog(#"%#", speakerID);
}
for(NSString *speakerID in speakerIDList)
{
if(![speakerIDListGrouped containsObject:speakerID])
{
NSLog(#"FLOWCHECK~ loadUngroupedSpeakerList: speakerID: %#", speakerID);
[speakerList addObject:speakerID];
}
}
There might be some issue with the objects inside the array....
This answer will help other's. It's very simple, use following method of NSArray
id commonObject = [array1 firstObjectCommonWithArray:array2];
Ref: https://developer.apple.com/documentation/foundation/nsarray/1408825-firstobjectcommonwitharray?language=objc
NSArray *mystring = [[NSArray alloc]init];
mystring = _fetchedResultsController.fetchedObjects;
// NSString *string = [NSString stringWithFormat:#"%#",mystring];
_messages = [[NSMutableArray alloc]initWithArray:mystring];
for (Message *msg in _messages) {
[mystring lastObject];
NSString *text = [NSString stringWithFormat:#"%#",msg.text];
self.messages = [[NSMutableArray alloc] initWithObjects:
[[JSQMessage alloc] initWithSenderId:kJSQDemoAvatarIdWoz
senderDisplayName:_user_email
date:[NSDate distantPast]
text:text],
nil];
My array contain right now 3 messages for example and then on the app I only can see the last message from the array. I know the problem which is maybe I'm just assuming: or something wrong with my declaration of the array maybe .first object or .last object or .count needed to be set in some way Or most likely I'm missing something in the [JSQMESSAGE] object that will return all messages array into the app. Either way that's way I'm here for that, so if some one can guideline me on what to do, for sure I can't call the [[JSQMESSAGE ALLOC] a million time's...
I need some example with NSINTEGER or something I just need all messages to be displayed how can I do that? also How can I see all the sender messages not just the received messages?
And also in general some help with this un clear FrameWork will be great.
I'm using core data with fetchedResultsController.
And JSQMessages framework.
The simulator Screen shot image:
http://postimg.org/image/gkjpssbbd/
If I'm reading this correctly it looks like you're re-initializing your array with the objects of what appears to be another array. This would just add the JSQMessages array to your self.messages array as an object, with the object actually containing the messages. I don't know anything about JSQMessage but it seems that what it's returning to you is already an array of messages. Simply set your self.messages array equal to the JSQMessages array after initializing self.messages.
If this is not the case then actually read the documentation for that framework.
i am constructing All data to look like a response data dictionary from a server.
Now, newsFeedsDict1 which should Dictionary for both Bolly and Global is not only showing all data inside Global dictionary only. While my for loop is running its showing correct data for Bolly. but for 2nd time its showing Bolly's data also in Global dictionary.
if(internetStatus == NotReachable)
{
NSMutableArray *titleArr = [[NSMutableArray alloc] init];
NSMutableArray *wholeFeeds = [[[NSMutableArray alloc] init] autorelease];
[titleArr addObject:#"Bolly"];
[titleArr addObject:#"Global"];
for (NSString *title in titleArr) {
//titleArr = [[NSUserDefaults standardUserDefaults] objectForKey:#"TitleArray"];
NSLog(#"TITle arr %#",titleArr);
NSLog(#"No internet");
OrderedDictionary *newsFeedsDict1 = [[[OrderedDictionary alloc] init] autorelease];
NSMutableDictionary *newsFeedsDict = [[[NSMutableDictionary alloc] init] autorelease];
NSMutableArray *myLocalArray= [[[NSMutableArray alloc] init] autorelease];
myLocalArray = [[Database sharedDatabase] getArticleData:title];
NSMutableDictionary *articleDict = [[[NSMutableDictionary alloc] init] autorelease];
[articleDict setObject:myLocalArray forKey:#"article"];
[newsFeedsDict setObject:articleDict forKey:#"Articles"];
[newsFeedsDict setObject:title forKey:#"#name"];
[newsFeedsDict1 setObject:newsFeedsDict forKey:title];
[wholeFeeds addObject:newsFeedsDict1];
NSLog(#"news feed dict %#",newsFeedsDict1);
NSMutableDictionary *temparticleDictionary = [[NSMutableDictionary alloc] init];
self.articleDictionary = temparticleDictionary;
self.categoriesDictionary = [[NSMutableDictionary alloc] init];
self.categoriesDictionary =newsFeedsDict1;
[self createArticleDictionaryForCategory:newsFeedsDict];
}
}
It's difficult to tell what your code is supposed to do, and how you can tell that one dictionary has the same content as another. A couple problems:
NSMutableArray *myLocalArray= [[[NSMutableArray alloc] init] autorelease];
myLocalArray = [[Database sharedDatabase] getArticleData:title];
The first line is entirely unnecessary. You're creating a new array, assigning it to myLocalArray, and then assigning something else to myLocalArray. You do the same later with self.categoriesDictionary. This leads me to believe that you have some misunderstanding with respect to object pointers.
So, the array that you get from your shared database ends up at myLocalArray, and you then add that array to the dictionary at articleDict, and then add articleDict to newsFeedDict and in turn add that to newsFeedDict1. And then you log newsFeedDict1. You do exactly the same for both your titles, #"Bolly" and #"Global", so it's not at all surprising that you see the same output in both cases.
I'm having a hard time seeing why you expect the output to be different, and I have to guess that again it's due to a misunderstanding of what happens when you assign one object pointer to another. Or, perhaps you're expecting the array that you get from [[Database sharedDatabase] getArticleData:title]; to be different because you're passing in different titles. Maybe you really should be getting different arrays there; it would be a good idea to look at what happens in that -getArticleData: method and whether it really is giving you the right results for each title.
If that doesn't help, take some time to clean up your code so that it's easier for us, and more importantly, for you to really see what's going on. Also, please edit your question to give a better description of what you're seeing and how that's different from what you expect to see.
Can you write the snippet for *getArticleData()* method
If I've to reinitialize a NSArray with others values, is it right to do this?
NSArray *array = [[NSArray alloc] initWithObjects:obj1, obj2, nil];
// ...
// some code
// ...
array = [[NSArray alloc] initWithObjects:obj3, obj4, nil];
thanks
Yes this is absolutely right. The new object is completely different than the previous. The object pointer now points to a new object and the old one will be released, since you are using ARC.
It is not exactly the same as reinitializing because you throw away the object and getting a new, but NSArray is immutable so this is the only way to "reinitialize" it.
Your code does not re-initialze an NSArray. It just assigns a new object to the variable array. That's fine.
I thinks this code may help you. At least, I thing this may be a suitable solution, especially if you are using ARC:
NSObject *obj1 = [NSNull null];
NSObject *obj2 = [NSNull null];
NSMutableArray *arrayObj = [NSMutableArray arrayWithObjects:obj1, obj2, nil];
[arrayObj removeAllObjects];
arrayObj = [NSMutableArray arrayWithObjects:obj1, obj2, nil];
I hope it helps you :)
you can reinitialize NSArray with same name ,you will not get any error or warning but the latest objects gets replaced with previous objects.The previous objects overwrites. For this you have to use ARC otherwise memory problem will occurs.