Classes/AssetBrowser/AssetBrowserSource.m
/* |
File: AssetBrowserSource.m |
Abstract: Represents a source like the camera roll and vends AssetBrowserItems. |
Version: 1.3 |
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*/ |
#import "AssetBrowserSource.h" |
#import "DirectoryWatcher.h" |
#import <MobileCoreServices/UTCoreTypes.h> |
#import <MobileCoreServices/UTType.h> |
#import <MediaPlayer/MediaPlayer.h> |
#import <AssetsLibrary/AssetsLibrary.h> |
@interface AssetBrowserSource () <DirectoryWatcherDelegate> |
@property (nonatomic, copy) NSArray *items; // NSArray of AssetBrowserItems |
@end |
@implementation AssetBrowserSource |
@synthesize name = sourceName, items = assetBrowserItems, delegate, type = sourceType; |
- (NSString*)nameForSourceType |
{ |
NSString *name = nil; |
switch (sourceType) { |
case AssetBrowserSourceTypeFileSharing: |
name = NSLocalizedString(@"File Sharing", nil); |
break; |
case AssetBrowserSourceTypeCameraRoll: |
name = NSLocalizedString(@"Camera Roll", nil); |
break; |
case AssetBrowserSourceTypeIPodLibrary: |
name = NSLocalizedString(@"iPod Library", nil); |
break; |
default: |
name = nil; |
break; |
} |
return name; |
} |
+ (AssetBrowserSource*)assetBrowserSourceOfType:(AssetBrowserSourceType)sourceType |
{ |
return [[self alloc] initWithSourceType:sourceType]; |
} |
- (id)initWithSourceType:(AssetBrowserSourceType)type |
{ |
if ((self = [super init])) { |
sourceType = type; |
sourceName = [self nameForSourceType]; |
assetBrowserItems = [NSArray array]; |
enumerationQueue = dispatch_queue_create("Browser Enumeration Queue", DISPATCH_QUEUE_SERIAL); |
dispatch_set_target_queue(enumerationQueue, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0)); |
} |
return self; |
} |
- (void)updateBrowserItemsAndSignalDelegate:(NSArray*)newItems |
{ |
self.items = newItems; |
/* Ideally we would reuse the AssetBrowserItems which remain unchanged between updates. |
This could be done by maintaining a dictionary of assetURLs -> AssetBrowserItems. |
This would also allow us to more easily tell our delegate which indices were added/removed |
so that it could animate the table view updates. */ |
if (self.delegate && [self.delegate respondsToSelector:@selector(assetBrowserSourceItemsDidChange:)]) { |
[self.delegate assetBrowserSourceItemsDidChange:self]; |
} |
} |
- (void)dealloc |
{ |
if (receivingIPodLibraryNotifications) { |
MPMediaLibrary *iPodLibrary = [MPMediaLibrary defaultMediaLibrary]; |
[iPodLibrary endGeneratingLibraryChangeNotifications]; |
[[NSNotificationCenter defaultCenter] removeObserver:self name:MPMediaLibraryDidChangeNotification object:nil]; |
} |
if (assetsLibrary) { |
[[NSNotificationCenter defaultCenter] removeObserver:self name:ALAssetsLibraryChangedNotification object:nil]; |
} |
[directoryWatcher invalidate]; |
directoryWatcher.delegate = nil; |
} |
#pragma mark - |
#pragma mark iPod Library |
- (void)updateIPodLibrary |
{ |
dispatch_async(enumerationQueue, ^(void) { |
// Grab videos from the iPod Library |
MPMediaQuery *videoQuery = [[MPMediaQuery alloc] init]; |
NSMutableArray *items = [NSMutableArray arrayWithCapacity:0]; |
NSArray *mediaItems = [videoQuery items]; |
for (MPMediaItem *mediaItem in mediaItems) { |
NSURL *URL = (NSURL*)[mediaItem valueForProperty:MPMediaItemPropertyAssetURL]; |
if (URL) { |
NSString *title = (NSString*)[mediaItem valueForProperty:MPMediaItemPropertyTitle]; |
AssetBrowserItem *item = [[AssetBrowserItem alloc] initWithURL:URL title:title]; |
[items addObject:item]; |
} |
} |
dispatch_async(dispatch_get_main_queue(), ^(void) { |
[self updateBrowserItemsAndSignalDelegate:items]; |
}); |
}); |
} |
- (void)iPodLibraryDidChange:(NSNotification*)changeNotification |
{ |
[self updateIPodLibrary]; |
} |
- (void)buildIPodLibrary |
{ |
MPMediaLibrary *iPodLibrary = [MPMediaLibrary defaultMediaLibrary]; |
receivingIPodLibraryNotifications = YES; |
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(iPodLibraryDidChange:) |
name:MPMediaLibraryDidChangeNotification object:nil]; |
[iPodLibrary beginGeneratingLibraryChangeNotifications]; |
[self updateIPodLibrary]; |
} |
#pragma mark - |
#pragma mark Assets Library |
- (void)updateAssetsLibrary |
{ |
NSMutableArray *assetItems = [NSMutableArray arrayWithCapacity:0]; |
ALAssetsLibrary *assetLibrary = assetsLibrary; |
[assetLibrary enumerateGroupsWithTypes:ALAssetsGroupAll usingBlock:^(ALAssetsGroup *group, BOOL *stop) { |
if (group) { |
[group setAssetsFilter:[ALAssetsFilter allVideos]]; |
[group enumerateAssetsUsingBlock: |
^(ALAsset *asset, NSUInteger index, BOOL *stopIt) |
{ |
if (asset) { |
ALAssetRepresentation *defaultRepresentation = [asset defaultRepresentation]; |
NSString *uti = [defaultRepresentation UTI]; |
NSURL *URL = [[asset valueForProperty:ALAssetPropertyURLs] valueForKey:uti]; |
NSString *title = [NSString stringWithFormat:@"%@ %lu", NSLocalizedString(@"Video", nil), [assetItems count]+1]; |
AssetBrowserItem *item = [[AssetBrowserItem alloc] initWithURL:URL title:title]; |
[assetItems addObject:item]; |
} |
}]; |
} |
// group == nil signals we are done iterating. |
else { |
dispatch_async(dispatch_get_main_queue(), ^{ |
[self updateBrowserItemsAndSignalDelegate:assetItems]; |
}); |
} |
} |
failureBlock:^(NSError *error) { |
NSLog(@"error enumerating AssetLibrary groups %@\n", error); |
}]; |
} |
- (void)assetsLibraryDidChange:(NSNotification*)changeNotification |
{ |
[self updateAssetsLibrary]; |
} |
- (void)buildAssetsLibrary |
{ |
assetsLibrary = [[ALAssetsLibrary alloc] init]; |
ALAssetsLibrary *notificationSender = nil; |
NSString *minimumSystemVersion = @"4.1"; |
NSString *systemVersion = [[UIDevice currentDevice] systemVersion]; |
if ([systemVersion compare:minimumSystemVersion options:NSNumericSearch] != NSOrderedAscending) |
notificationSender = assetsLibrary; |
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(assetsLibraryDidChange:) |
name:ALAssetsLibraryChangedNotification object:notificationSender]; |
[self updateAssetsLibrary]; |
} |
#pragma mark - |
#pragma mark iTunes File Sharing |
- (NSArray*)browserItemsInDirectory:(NSString*)directoryPath |
{ |
NSMutableArray *paths = [NSMutableArray arrayWithCapacity:0]; |
NSArray *subPaths = [[[NSFileManager alloc] init] contentsOfDirectoryAtPath:directoryPath error:nil]; |
if (subPaths) { |
for (NSString *subPath in subPaths) { |
NSString *pathExtension = [subPath pathExtension]; |
CFStringRef preferredUTI = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, (__bridge CFStringRef)pathExtension, NULL); |
BOOL fileConformsToUTI = UTTypeConformsTo(preferredUTI, kUTTypeAudiovisualContent); |
CFRelease(preferredUTI); |
NSString *path = [directoryPath stringByAppendingPathComponent:subPath]; |
if (fileConformsToUTI) { |
[paths addObject:path]; |
} |
} |
} |
NSMutableArray *browserItems = [NSMutableArray arrayWithCapacity:0]; |
for (NSString *path in paths) { |
AssetBrowserItem *item = [[AssetBrowserItem alloc] initWithURL:[NSURL fileURLWithPath:path]]; |
[browserItems addObject:item]; |
} |
return browserItems; |
} |
- (void)directoryDidChange:(DirectoryWatcher *)folderWatcher |
{ |
NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0]; |
dispatch_async(enumerationQueue, ^(void) { |
NSArray *browserItems = [self browserItemsInDirectory:documentsDirectory]; |
dispatch_async(dispatch_get_main_queue(), ^(void) { |
[self updateBrowserItemsAndSignalDelegate:browserItems]; |
}); |
}); |
} |
- (void)buildFileSharingLibrary |
{ |
NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0]; |
NSArray *browserItems = [self browserItemsInDirectory:documentsDirectory]; |
[self updateBrowserItemsAndSignalDelegate:browserItems]; |
directoryWatcher = [DirectoryWatcher watchFolderWithPath:documentsDirectory delegate:self]; |
} |
- (void)buildSourceLibrary |
{ |
if (haveBuiltSourceLibrary) |
return; |
switch (sourceType) { |
case AssetBrowserSourceTypeFileSharing: |
[self buildFileSharingLibrary]; |
break; |
case AssetBrowserSourceTypeCameraRoll: |
[self buildAssetsLibrary]; |
break; |
case AssetBrowserSourceTypeIPodLibrary: |
[self buildIPodLibrary]; |
break; |
default: |
break; |
} |
haveBuiltSourceLibrary = YES; |
} |
@end |
Copyright © 2014 Apple Inc. All Rights Reserved. Terms of Use | Privacy Policy | Updated: 2014-07-08