IOS Memory Management - writing video to temp file - ios

Question

I'm creating an app that plays back multiple videos and photos in a snapchat story fashion. I fetch each of these videos data and write it to a temp file in order to play with AVPlayer.
NSString *outputPath = [[NSString alloc] initWithFormat:#"%#%#", NSTemporaryDirectory(), [NSString stringWithFormat:#"output%i.mov", i]];
[data writeToFile:outputPath atomically:YES];
In viewWillDissapear I delete all of these files with:
NSArray* tmpDirectory = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:NSTemporaryDirectory() error:NULL];
for (NSString *file in tmpDirectory) {
[[NSFileManager defaultManager] removeItemAtPath:[NSString stringWithFormat:#"%#%#", NSTemporaryDirectory(), file] error:NULL];
}
But when I look at how much memory my app is using, in settings, its around 300 mb. Is there a way to see what is actually taking up all this memory? I would think this is high since I'm not caching anything besides the currentUser data (name, profileImage).
Should I be doing something else to clean the temp files?

Answer 1

But this line is absolutely wrong:
[data writeToFile:outputPath atomically:YES];
The implication is that at some moment — this moment — you are holding an entire video in memory (as data). That is completely incorrect; it should never happen. You should download to a file on disk, and if necessary, write that file to another file; you should never attempt to load the entire video into memory at once.

Answer 2

As #peter mentioned, you can use streaming Video streaming.
Or else If you really want to download video file and store it into the disk space and want to utilize it later part then you should follow apple recommended way i.e NSFileHandle class to optimize your application heap memory while downloading larger files.
NSFileHandle