How to remove tmp directory files of an ios app?

问题:

I'm working on an app that uses the iPhone camera and after making several tests I've realised that it is storing all the captured videos on the tmp directory of the app. The captures don`t disappear even if the phone is restarted.

Is there any way to remove all these captures or is there any way to easily clean all cache and temp files?

回答1:

Yes. This method works well:

+ (void)clearTmpDirectory
{
    NSArray* tmpDirectory = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:NSTemporaryDirectory() error:NULL];
    for (NSString *file in tmpDirectory) {
        [[NSFileManager defaultManager] removeItemAtPath:[NSString stringWithFormat:@"%@%@", NSTemporaryDirectory(), file] error:NULL];
    }
}

回答2:

Swift 3 version as extension:

extension FileManager {
    func clearTmpDirectory() {
        do {
            let tmpDirectory = try contentsOfDirectory(atPath: NSTemporaryDirectory())
            try tmpDirectory.forEach {[unowned self] file in
                let path = String.init(format: "%@%@", NSTemporaryDirectory(), file)
                try self.removeItem(atPath: path)
            }
        } catch {
            print(error)
        }
    }
}

Example of usage:

FileManager.default.clearTmpDirectory()

Thanks to Max Maier, Swift 2 version:

func clearTmpDirectory() {
    do {
        let tmpDirectory = try NSFileManager.defaultManager().contentsOfDirectoryAtPath(NSTemporaryDirectory())
        try tmpDirectory.forEach { file in
            let path = String.init(format: "%@%@", NSTemporaryDirectory(), file)
            try NSFileManager.defaultManager().removeItemAtPath(path)
        }
    } catch {
        print(error)
    }
}

回答3:

Swift 4

One of the possible implementations

extension FileManager {
    func clearTmpDirectory() {
        do {
            let tmpDirURL = FileManager.default.temporaryDirectory
            let tmpDirectory = try contentsOfDirectory(atPath: tmpDirURL.path)
            try tmpDirectory.forEach { file in
                let fileUrl = tmpDirURL.appendingPathComponent(file)
                try removeItem(atPath: fileUrl.path)
            }
        } catch {
           //catch the error somehow
        }
    }
}

回答4:

Try this code to remove NSTemporaryDirectory files

-(void)deleteTempData
{
    NSString *tmpDirectory = NSTemporaryDirectory();
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSError *error;
    NSArray *cacheFiles = [fileManager contentsOfDirectoryAtPath:tmpDirectory error:&error];
    for (NSString *file in cacheFiles)
    {
        error = nil;
        [fileManager removeItemAtPath:[tmpDirectory stringByAppendingPathComponent:file] error:&error];
    }
}

and to check data remove or not write code in didFinishLaunchingWithOptions

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    [self.window makeKeyAndVisible];

    NSString *tmpDirectory = NSTemporaryDirectory();
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSError *error;
    NSArray *cacheFiles = [fileManager contentsOfDirectoryAtPath:tmpDirectory error:&error];
    NSLog(@"TempFile Count ::%lu",(unsigned long)cacheFiles.count);

    return YES;
}

回答5:

This works on a jailbroken iPad, but I think this should work on a non-jailbroken device also.

-(void) clearCache
{
    for(int i=0; i< 100;i++)
    {
        NSLog(@"warning CLEAR CACHE--------");
    }
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSError * error;
    NSArray * cacheFiles = [fileManager contentsOfDirectoryAtPath:NSTemporaryDirectory() error:&error];

    for(NSString * file in cacheFiles)
    {
        error=nil;
        NSString * filePath = [NSTemporaryDirectory() stringByAppendingPathComponent:file ];
        NSLog(@"filePath to remove = %@",filePath);

        BOOL removed =[fileManager removeItemAtPath:filePath error:&error];
        if(removed ==NO)
        {
            NSLog(@"removed ==NO");
        }
        if(error)
        {
            NSLog(@"%@", [error description]);
        }
    }
}

回答6:

Thanks to Max Maier and Roman Barzyczak. Updated to Swift 3, using URLs instead of strings.

Swift 3

func clearTmpDir(){

        var removed: Int = 0
        do {
            let tmpDirURL = URL(string: NSTemporaryDirectory())!
            let tmpFiles = try FileManager.default.contentsOfDirectory(at: tmpDirURL, includingPropertiesForKeys: nil, options: .skipsHiddenFiles)
            print("\(tmpFiles.count) temporary files found")
            for url in tmpFiles {
                removed += 1
                try FileManager.default.removeItem(at: url)
            }
            print("\(removed) temporary files removed")
        } catch {
            print(error)
            print("\(removed) temporary files removed")
        }
}