2014年4月2日 星期三

Deleting all the files in the iPhone sandbox (documents folder)?

http://stackoverflow.com/questions/4793278/deleting-all-the-files-in-the-iphone-sandbox-documents-folder

Is there an easy way to delete all the files(images) I saved in the documents folder of the app?
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stackoverflow.com/questions/4792663/… this is a similar question assuming he wants to delete everything in the documents folder, but no solution yet –  Jinah Adam Jan 25 '11 at 12:12
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up vote71down voteaccepted
NSFileManager *fileMgr = [[[NSFileManager alloc] init] autorelease];
NSError *error = nil;
NSArray *directoryContents = [fileMgr contentsOfDirectoryAtPath:documentsDirectory error:&error];
if (error == nil) {
    for (NSString *path in directoryContents) {
        NSString *fullPath = [documentsDirectory stringByAppendingPathComponent:path];
        BOOL removeSuccess = [fileMgr removeItemAtPath:fullPath error:&error];
        if (!removeSuccess) {
            // Error handling
            ...
        }
    }
} else {
    // Error handling
    ...
}
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1  
it worked for the most part. but it turns out it removeItemAtPath requires full file path. so i used this NSString *myFilePath = [documentsDir stringByAppendingPathComponent:path]; thanks. –  Jinah Adam Jan 25 '11 at 12:43
1  
That's right, Jinah. My error. I am gonna correct the code above. –  Ole Begemann Jan 25 '11 at 12:45
2  
If this works, it would be nice to remove the Untested code: comment. Thanks –  Warpspace Feb 9 '12 at 8:58
    
I get an EXC_BAD_ACCESS every time I execute this. But it deletes the contents of my sand box though. How do I prevent the error? Any ideas? –  acecapades Aug 10 '12 at 7:50
1  
I got documentsDirectory as undeclared Identifier. using NSDocumentDirectory also does not work in its place. It says, incompatible integer to pointer conversion. –  Ankit Tanna Aug 21 '13 at 8:07
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up vote6down vote
- (void)removeFile
{
    // you need to write a function to get to that directory
    NSString *filePath = [self getDirectory];
    NSFileManager *fileManager = [NSFileManager defaultManager];  
    if ([fileManager fileExistsAtPath:filePath]) 
    {
        NSError *error;
        if (![fileManager removeItemAtPath:filePath error:&error])
        {
            NSLog(@"Error removing file: %@", error); 
        };
    }
}
I believe this is shorter.
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It appears this only removes a single file or directory –  Warpspace Feb 9 '12 at 8:55
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up vote6down vote
Code did not work with IOS 7 and Xcode 5 so edited to work with my app. Big credits to @Ole Begemann and @pablasso.
-(void)EmptySandbox
{
    NSFileManager *fileMgr = [[NSFileManager alloc] init];
    NSError *error = nil;
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSArray *files = [fileMgr contentsOfDirectoryAtPath:documentsDirectory error:nil];

    while (files.count > 0) {
        NSString *documentsDirectory = [paths objectAtIndex:0];
        NSArray *directoryContents = [fileMgr contentsOfDirectoryAtPath:documentsDirectory error:&error];
        if (error == nil) {
            for (NSString *path in directoryContents) {
                NSString *fullPath = [documentsDirectory stringByAppendingPathComponent:path];
                BOOL removeSuccess = [fileMgr removeItemAtPath:fullPath error:&error];
                files = [fileMgr contentsOfDirectoryAtPath:documentsDirectory error:nil];
                if (!removeSuccess) {
                    // Error
                }
            }
        } else {
            // Error
        }
    }
}
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If you're using CoreData, just note this will delete your Model also –  BenB Mar 20 at 23:35
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up vote1down vote
 NSFileManager *fileMgr = [[[NSFileManager alloc] init] autorelease];
NSError *error = nil;
NSArray *directoryContents = [fileMgr contentsOfDirectoryAtPath:documentsDirectory error:&error];
 if (error == nil) {
   for (NSString *path in directoryContents) {
    NSString *fullPath = [documentsDirectory stringByAppendingPathComponent:path];
    BOOL removeSuccess = [fileMgr removeItemAtPath:fullPath error:&error];
    if (!removeSuccess) {
        // Error handling
        ...
    }
}
} else {
 // Error handling
...
}
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