I have one NSMutableArray tempArray = \[NSMutableArray array\]; which contains an array of structured objects with multiple data: brand_package_id , slide_master_id etc....
I want to sort out the tempArray according to slide_master_id's.
Please see given image and help me to sort this problem.
Try using NSSortDescriptor:
NSSortDescriptor *slideDescriptor = [[NSSortDescriptor alloc]
initWithKey:#"slide_master_id" ascending:YES];
NSArray *sortDescriptors = #[slideDescriptor];
NSArray *sortedArray = [tempArray sortedArrayUsingDescriptors:sortDescriptors];
Related
An array contains NSDate objects, how to sort these using sort descriptor ? I am trying the code below:
NSSortDescriptor * dateSortDescriptor = [NSSortDescriptor sortDescriptorWithKey:#"Date" ascending:YES];
NSArray * sortedArray = [allDates addObjectsFromArray:[allDates sortedArrayUsingDescriptors:#[dateSortDescriptor]]];
NSDate conforms to the compare: method and ascending is the default order
NSArray *sortedArray = [allDates sortedArrayUsingSelector:#selector(compare:)];
#Avt, answered this question I don't know why he removed it.
NSSortDescriptor * dateSortDescriptor = [NSSortDescriptor sortDescriptorWithKey:#"timeIntervalSince1970" ascending:YES];
NSArray * sortedArray = [allDates addObjectsFromArray:[allDates sortedArrayUsingDescriptors:#[dateSortDescriptor]]];
I have a mutable array containing some arrays for use in a table view controller. The arrays contain a title and some other information. I want the arrays in the master array to be sorted alphabetically in terms of the title they contain. I have assigned the titles with keys:
NSString *title = #"objectTitle";
NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:_storedTitle.text, title, nil];
NSArray *newArray = #[#"Login", dict, _storedUsername.text, _storedPassword.text];
I store the newArray in my masterArray and try to sort the array thus:
//sort array alphabetically
NSSortDescriptor *titleDescriptor = [[NSSortDescriptor alloc] initWithKey:#"objectTitle" ascending:YES];
NSArray *sortDescriptors = #[titleDescriptor];
NSArray *sortedArray = [_masterArray sortedArrayUsingDescriptors:sortDescriptors];
_masterArray = sortedArray.copy;
This is not working, as i have not specified the index where the titleDescriptor is stored. How do I do this?
When accessing the title at a given index (index) in the master array is done as follows:
NSLog(#"%#", [[[_masterArray objectAtIndex:index] objectAtIndex:1] objectForKey:#"objectTitle"]);
Modified your code like this:-
NSSortDescriptor *sortedDescriptor =
[[[NSSortDescriptor alloc]
initWithKey:#"objecttitle"
ascending:YES
selector:#selector(localizedCaseInsensitiveCompare:)] autorelease];
NSArray * descriptors =
[NSArray arrayWithObjects:sortedDescriptor, nil];
NSArray * sortedArray =
[array sortedArrayUsingDescriptors:descriptors];
NSlog(#"%#",sortedArray);
Trying to sort an array of dictionaries. There are two arrays in the plist file and I am trying to sort one of them and having a lot of trouble. I can extract the dictionaries into a NSArray and sort the files.
I can only do this by extracting the dictionaries so when I try to save the information back to the plist I've lost my structure and other array of dictionaries.
How can I sort the array correctly. I understand I'm extracting the array and then saving it as it's own file. I see what I'm doing wrong but can't figure how the correct way.
NSArray *array = [dict valueForKey:#"Lighting"];
NSSortDescriptor* nameSortDescriptor = [[NSSortDescriptor alloc] initWithKey:#"Controller Zone" ascending:YES];
NSArray* sortedArray = [array sortedArrayUsingDescriptors:[NSArray arrayWithObject:nameSortDescriptor]];
NSString *pathToFileExportSorted = #"/Users/scott/Desktop/plistPreSEsorted.plist";
[sortedArray writeToFile:pathToFileExportSorted atomically: YES];
I have tried something like this but couldn't get that working either
[array sortUsingDescriptors:[NSArray arrayWithObject:[NSSortDescriptor sortDescriptorWithKey:#"Lighting.Controller Zone" ascending:YES]]];
I just want to sort the Array Lighting by "Controller Zone" and keep the plist as is otherwise.
Thanks for any help.
Original Data:
What I am currently Exporting, does not have Lighting and Shade array. The array is now the only thing in the plist.
it's needed to assign sorted array to Lighting key
...and to save your initial dictionary with changed Lighting key
NSArray *array = [dict valueForKey:#"Lighting"];
NSSortDescriptor *nameSortDescriptor = [[NSSortDescriptor alloc] initWithKey:#"Controller Zone" ascending:YES];
NSArray *sortedArray = [array sortedArrayUsingDescriptors:[NSArray arrayWithObject:nameSortDescriptor]];
NSMutableDictionary *dictToSave = [[dict mutableCopy] autorelease];
[dictToSave setObject:sortedArray forKey:#"Lighting"];
NSString *pathToFileExportSorted = #"/Users/scott/Desktop/plistPreSEsorted.plist";
[dictToSave writeToFile:pathToFileExportSorted atomically:YES];
That should work as you've described.
I am attempting to sort an NSArray that is populated with custom objects. Each object has a property startDateTime that is of type NSDate.
The following code results in an array, sortedEventArray, populated but not sorted. Am I going about this the completely wrong way or am I just missing something small?
NSSortDescriptor *dateDescriptor = [NSSortDescriptor sortDescriptorWithKey:#"startDateTime"
ascending:YES];
NSArray *sortDescriptors = [NSArray arrayWithObject:dateDescriptor];
NSArray *sortedEventArray = [nodeEventArray sortedArrayUsingDescriptors:sortDescriptors];
Are you sure that the startDateTime instance variables of the node events are non-nil?
If you don't have one already, you might add a (custom) -description method to your node event objects that does something like this:
- (NSString *)description {
return [NSString stringWithFormat:#"%# - %#",
[super description], startDateTime]];
}
Then in your sorting code log the array before and after:
NSLog(#"nodeEventArray == %#", nodeEventArray);
NSSortDescriptor *dateDescriptor = [NSSortDescriptor
sortDescriptorWithKey:#"startDateTime"
ascending:YES];
NSArray *sortDescriptors = [NSArray arrayWithObject:dateDescriptor];
NSArray *sortedEventArray = [nodeEventArray
sortedArrayUsingDescriptors:sortDescriptors];
NSLog(#"sortedEventArray == %#", sortedEventArray);
If the startDateTime's are all nil, then the before and after arrays will have the same order (since the sorting operation will equate to sending all the -compare: messages to nil, which basically does nothing).
Did you try by specifying the NSDate comparator?
Eg:
NSSortDescriptor *dateDescriptor = [NSSortDescriptor
sortDescriptorWithKey:#"startDateTime"
ascending:YES
selector:#selector(compare:)];
This should enforce the usage of the correct comparator of the NSDate class.
Ok, I know this is a little late, but this is how I would do it:
NSArray *sortedEventArray = [events sortedArrayUsingComparator:^NSComparisonResult(Event *event1, Event *event2) {
return [event1.startDateTime compare:event2.startDateTime];
}];
Obviously, replace Event with the class of your custom object. The advantage of this approach is that you are protected against future refactoring. If you were to refactor and rename the startDateTime property to something else, Xcode probably would not change the string you're passing into the sort descriptor. Suddenly, your sorting code would break/do nothing.
You can achieve like this,
NSSortDescriptor *descriptor = [[NSSortDescriptor alloc] initWithKey:#"anyDateField" ascending:YES];
NSMutableArray *arr = [[array sortedArrayUsingDescriptors:[NSArray arrayWithObjects:descriptor,nil]]mutableCopy];
You can achieve this like this,
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:#"date" ascending:FALSE];
[self.Array sortUsingDescriptors:[NSArray arrayWithObject:sortDescriptor]];
I have an array which contains dictionaries in it; so how can I sort the array according to dictionary key values?
If every element in the array is a dictionary containing a certain key, you can sort the array using a sort descriptor. For instance, if every element is a dictionary containing a key called "name":
NSSortDescriptor *sortByName = [NSSortDescriptor sortDescriptorWithKey:#"name"
ascending:YES];
NSArray *sortDescriptors = [NSArray arrayWithObject:sortByName];
NSArray *sortedArray = [array sortedArrayUsingDescriptors:sortDescriptors];
The other way to achieve this would be using sortedArrayUsingComparator: method
NSArray *sortedArray = [array sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
return [[obj1 valueForKey:#"value"] compare:[obj2 valueForKey:#"value"]];
}];
why don't you use a sorted dictionary where the property of sorted elements comes already with the data structure?
Please do check it out here
Hope this helps.
The above shared answer by Bavarious helped me.Just want to add one more thing.If you want to sort a mutable array use something like the below code
NSSortDescriptor *sortByName = [NSSortDescriptor sortDescriptorWithKey:#"name" ascending:YES];
NSArray *sortDescriptors = [NSArray arrayWithObject:sortByName];
NSMutableArray *sortedArray = [[NSMutableArray sortedArrayUsingDescriptors:sortDescriptors]mutableCopy];
let arrDescriptor = NSSortDescriptor(key: "order", ascending: true)
let sortDescriptors: NSArray = [arrDescriptor]
let sortedArray = instancesubArray.sortedArray(using: sortDescriptors as [AnyObject] as [AnyObject] as! [NSSortDescriptor])
print(sortedArray)