I need to store CMTimeRange of different videos in array later i will merge these videos.
please answer if anybody know about it.any answer will be appreciated.....
Use CMTimeRangeCopyAsDictionary to create a CFDictionaryRef from your CMTimeRange, and use CMTimeRangeMakeFromDictionary to get your CMTimeRange back from the dictionary.
It should be possible to use the CMTimeRangeCopyAsDictionary function and save an array of dictionaries or failing that, you could save each time range using NSValue perhaps?
Related
for now i am creating my NSMutableArray using:
#define ARRAY_OF_ORDER_SOURCE [NSArray arrayWithObjects:DICTIONARY_OF_ORDER_SOURCE_ALL,DICTIONARY_OF_ORDER_SOURCE_ECOMMERCE,DICTIONARY_OF_ORDER_SOURCE_PHYSICAL,DICTIONARY_OF_ORDER_SOURCE_INVOICE,DICTIONARY_OF_ORDER_SOURCE_RECURRING,DICTIONARY_OF_ORDER_SOURCE_SALESVU,DICTIONARY_OF_ORDER_SOURCE_RESERVATION,nil]
i want to do some thing like:
if(somethingIstrue)
[ARRAY_OF_ORDER_SOURCE addObject:DICTIONARY_OF_ORDER_SOURCE_ALL]
if(somethingElseIstrue)
[ARRAY_OF_ORDER_SOURCE addObject:DICTIONARY_OF_ORDER_SOURCE_ECOMMERCE]
i am doing this as i need this array in my whole project, i have this in constant.h file.
how can i acheive this using macro??
Thanks.
If you really want to have a macro for this you can have a multiline macro and placed there the logic you want. It is not totally clear to me what you want to achieve but instead of macro I would prefer to have a category on NSMutableArray returning the array or some kind of Util class doing so.
There are numerous things wrong with your question. For starters, you claim you are creating an NSMutableArray, but you are in actuality creating an NSArray. You then try to addObject on the immutable array, which you cannot do.
In your line (note I modified it to add a comment):
if(somethingIstrue) {
// The NSArray isn't assigned to anything and tries to addObject to an NSArray
[ARRAY_OF_ORDER_SOURCE addObject:DICTIONARY_OF_ORDER_SOURCE_ALL]
}
you are not assigning the array to anything (as I already noted it won't work because it is trying to add to an NSArray).
I think you want to do something like:
NSMutableArray *orderedSource = [NSMutableArray array];
if (somethingIsTrue) {
[orderedSource addObject:addObject:DICTIONARY_OF_ORDER_SOURCE_ALL];
}
if (somethingElseIsTrue) {
[orderedSource addObject:addObject:DICTIONARY_OF_ORDER_SOURCE_ECOMMERCE];
}
The question you have to ask yourself is why do you insist on using a macro? You have no real design/approach here, which is why your ideas are coming across as scattered.
If you need to consistently create an array based on a set of constraints, one approach would be to create a class which can vend for you the array you want based on criteria. Or you can just do it where you need to using the approach above.
Is there any of way (other than looping) of extracting a particular property of all objects in an array. So say there in an array of people. I want to extract all their first names into an array.
Key Value coding will help you with that:
NSArray *result = [people valueForKey:#"firstname"];
I got answer for my question.
This is how we can achieve the same in swift.
let arraytWithProperties = arrayWithObjects.map{ $0.propertyName }
I have one NSDictionary and it loads up UITableView. If a user scrolls more and more, I call API and pull new data. This data is again in the form of an NSDictionary. Is it possible to add the new NSDictionary to the existing one?
You looking for this guy:
[NSMutableDictionary addEntriesFromDictionary:]
Make sure your UITableView dictionary is an NSMutableDictionary!
Check it here
Use NSMutableDictionary addEntriesFromDictionary to add the two dictionaries to a new mutable dictionary. You can then create an NSDictionary from the mutable one, but it's not usually necessary to have a dictionary non-mutable.
Is your NSDictionary full of other NSDictionaries? It sounds like you would need an NSMutableArray that you could add NSDictionaries to at the end. Assuming you can control the flow of data coming in and wouldn't run the risk of duplicates in your array, you could certainly append the data.
NSMutableArray *array = [[NSMutableArray alloc] init];
arrayCount = [array count]; // check the item count
[array addObject:dictToAppend];
Without seeing how you are implementing it, I can't provide more detailed code examples. Appending items is easy to do, but know it can only be done with mutable versions of Arrays or Dictionaries. Hope this helps a little.
Specifically, this problem has come to me when I make a request with AFNeworking with JSONkit and receive a (id)JSON with several arrays and dictionaries nested.
If I don't want to modify the data, I don't have any problem:
self.myNSArray = [JSON objectForKey:#"result"];
But if I want to modify the data I must to store it in a mutable variable:
self.myNSMutableArray = [[JSON objectForKey:#"result"] mutableCopy];
The last one doesn't convert nested arrays or dictionaries to mutable data; it works only for first level.
The only way that I have found is on this link recursive mutable objects; but I don't know if there is a best way to resolve this kind of problem.
Thanks in advance.
You could use the CoreFoundation function CFPropertyListCreateDeepCopy with the mutability option kCFPropertyListMutableContainersAndLeaves:
NSArray *immutableArray = [JSON objectForKey:#"result"];
self.myMutableArray = [(NSMutableArray *)CFPropertyListCreateDeepCopy(NULL, immutableArray, kCFPropertyListMutableContainersAndLeaves) autorelease];
On ARC:
CFBridgingRelease(CFPropertyListCreateDeepCopy(NULL, (__bridge CFPropertyListRef)(immutableArray), kCFPropertyListMutableContainersAndLeaves))
really worked. Thanks
brainjam.
Make sure you are taking care of null values in response string, otherwise it will return you nil which causes to horrible results.
(For Eg. Try mutataing response from
http://www.json-generator.com/api/json/get/bQVoMjeJOW?indent=1)
Just place below line when converting API response to JSON Object.
responseString=[responseString stringByReplacingOccurrencesOfString:#"\":null" withString:#"\":\"\""];//To Handle Null Characters
//Search for below line in your parsing library and paste above code
data = [responseString dataUsingEncoding:NSUTF8StringEncoding];
So there will be no null characters in your JSON object, hence no issue with using CFPropertyListCreateDeepCopy.
Cheers!!
I tried storing a selector(SEL) in a NSMutableDictionary and it caused a crash, probably because the dictionary tries to dereference it as an object pointer. What is the standard recipe for storing non-objects in a dictionary?
You can convert selectors to NSString using NSStringFromSelector() and you can go back the other way with NSSelectorFromString().
SEL aSel = #selector(takeThis:andThat:);
[myDict setObject:NSStringFromSelector(aSel) forKey:someKey];
SEL original = NSSelectorFromString([myDict objectForKey:someKey]);
Try using a NSMapTable with NSObjectMapKeyCallBacks and NSNonOwnedPointerMapValueCallBacks. This works like a NSMutableDictionary but allows any pointers as values, not just objects.
You also could store the selector in a NSInvocation object and use that with a regular dictionary. If you need to store more than the Selector (target, parameters and so on) this is probably the better solution.
Wrap them into objects.