Saving and retrieving files from a folder in documents directory IOS - ios

Question

I am trying to save and retrieve a file from a folder in the documents directory. I retrieve it in this way:
NSFileManager *fManager = [NSFileManager defaultManager];
NSString *item;
NSString *docsPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
NSArray *contents = [fManager contentsOfDirectoryAtPath:[NSString stringWithFormat:#"%#", docsPath] error:nil];
and save it like this:
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString* BusinessCardPath = [documentsDirectory stringByAppendingPathComponent: [NSString stringWithFormat:#"BusinessCard%lld.card", arc4random() % 100000000000000]];
For some reason if I do:
NSArray *contents = [fManager contentsOfDirectoryAtPath:[NSString stringWithFormat:#"%#/FOLDER", docsPath] error:nil];
and
NSString* BusinessCardPath = [documentsDirectory stringByAppendingPathComponent: [NSString stringWithFormat:#"FOLDER/BusinessCard%lld.card", FolderNumber, arc4random() % 100000000000000]];
It doesn't open or show the file, but when I log the two it shows the same directory. Is this how you use folders in IOS? Please help, i'm going crazyyyy!!

Answer 1

I guess you use the NSFileManager for nothing. it's confusing how you store and use your data.
Here's a class you could use to load, store and delete data into the NSDocumentDirectory:
DKStoreManager.h
#interface DKStoreManager : NSObject
+ (NSArray *)loadBusinessCardContentForKey:(NSString *)key;
+ (void)storeBusinessCardContent:(NSArray *)content forKey:(NSString *)key;
+ (void)removeBusinessCardForKey:(NSString *)key;
#end
DKStoreManager.m
#interface DKStoreManager () {
NSString * _rootPath;
}
#end
#implementation DKStoreManager
- (id)init {
self = [super init];
if (self) {
// get the root path of the Document Directory
// NSCacheDirectory is also good to use
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
_rootPath = [paths objectAtIndex:0];
}
return self;
}
+ (DKStoreManager *)sharedInstance {
static DKStoreManager *sharedInstance = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
sharedInstance = [[DKStoreManager alloc] init];
});
return sharedInstance;
}
#pragma mark - storing management methods
// store a data into a file in a specific sub directory
- (id)storeObject:(id)object inFile:(NSString *)filename inDirectory:(NSString *)directory {
NSString *fullPath = [_rootPath stringByAppendingPathComponent:directory];
if (![[NSFileManager defaultManager] fileExistsAtPath:fullPath])
[[NSFileManager defaultManager] createDirectoryAtPath:fullPath withIntermediateDirectories:YES attributes:nil error:nil];
fullPath = [fullPath stringByAppendingPathComponent:filename];
BOOL result = [NSKeyedArchiver archiveRootObject:object toFile:fullPath];
if (result)
NSLog(#"Successfully saved %#/%#", directory, filename);
else
NSLog(#"ERROR: can't save %#/%#", directory, filename);
return (result ? object : nil);
}
// remove a file in a specific sub directory
- (void)removeFile:(NSString *)filename inDirectory:(NSString *)directory {
NSString *fullPath = [_rootPath stringByAppendingPathComponent:directory];
if (![[NSFileManager defaultManager] fileExistsAtPath:fullPath])
return ;
fullPath = [fullPath stringByAppendingPathComponent:filename];
NSError *error = [NSError new];
if ([[NSFileManager defaultManager] removeItemAtPath:fullPath error:&error])
NSLog(#"Successfully removed %#/%#", directory, filename);
else
NSLog(#"ERROR: can't remove %#/%# : %#", directory, filename, [error localizedDescription]);
}
// get the data stored into a file
- (id)loadObjectInFile:(NSString *)filename inDirectory:(NSString *)directory {
NSString *fullPath = [_rootPath stringByAppendingPathComponent:directory];
if (![[NSFileManager defaultManager] fileExistsAtPath:fullPath])
return nil;
fullPath = [fullPath stringByAppendingPathComponent:filename];
return [NSKeyedUnarchiver unarchiveObjectWithFile:fullPath];
}
#pragma mark - business cards methods
+ (NSArray *)loadBusinessCardContentForKey:(NSString *)key {
DKStoreManager *storeManager = [DKStoreManager sharedInstance];
return [storeManager loadObjectInFile:key inDirectory:#"business_cards"];
}
+ (void)storeBusinessCardContent:(NSArray *)content forKey:(NSString *)key {
DKStoreManager *storeManager = [DKStoreManager sharedInstance];
[storeManager storeObject:content inFile:key inDirectory:#"business_cards"];
}
+ (void)removeBusinessCardForKey:(NSString *)key {
DKStoreManager *storeManager = [DKStoreManager sharedInstance];
[storeManager removeFile:key inDirectory:#"business_cards"];
}
#end
I don't really understand what you want to do but a good way to use this class could be:
NSArray *contents = [DKStoreManager loadBusinessCardContentForKey:aBusinessCard.name];
[DKStoreManager storeBusinessCardContent:aContent forKey:aBusinessCard.name];
[DKStoreManager removeBusinessCardForKey:aBusinessCard.name];
By the way you can store any data/object you want with this class: NSArray, NSDictionnary,... and even your own class the only thing you need to do is to implement the NSCoding protocol