Question

是否有一种简单的方法可以删除我保存在应用程序文档文件夹中的所有文件（图像）？

Answer 1

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
    ...
}

Answer 2

代码无法与IOS 7和Xcode 5一起使用，因此编辑后可以使用我的应用程序。 @Ole Begemann和@pablasso的大奖。

-(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
        }
    }
}

Answer 3

对于Swift开发者：

let fileMgr = NSFileManager()
let dirPath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0]
if let directoryContents = try? fileMgr.contentsOfDirectoryAtPath(dirPath)
{
    for path in directoryContents 
    {   
        let fullPath = (dirPath as NSString).stringByAppendingPathComponent(path)
        do 
        {
            try fileMgr.removeItem(atPath: fullPath)
            print("Files deleted")
        } 
        catch let error as NSError 
        {
            print("Error deleting: \(error.localizedDescription)")
        }
    }
}

Answer 4

- (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); 
        };
    }
}

我认为这更短。

Answer 5

Swift 2.1加上一些额外的：

do {
    let paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
    let documentsDirectory = paths[0]
    let documentsDirectoryURL = NSURL(fileURLWithPath: paths[0])

    let directoryContents = try NSFileManager.defaultManager().contentsOfDirectoryAtPath(documentsDirectory)

    var totalMegaBytes: Double = 0
    var nrOfFiles = 0

    for filename in directoryContents {
        let file = documentsDirectoryURL.URLByAppendingPathComponent(filename)


        let fileAttributes = try NSFileManager.defaultManager().attributesOfItemAtPath(file.path!)
        let fileSize = fileAttributes[NSFileSize] as! Double            
        totalMegaBytes += fileSize/1024/1024

        do {
            try NSFileManager.defaultManager().removeItemAtURL(file)
            nrOfFiles++
        }catch let error as NSError{
            print("> Emptying sandbox: could not delete file", filename, error)
        }
    }

    print("> Emptying sandbox: Removed \(nrOfFiles) files with a total of \(round(totalMegaBytes))MB")

}catch let error as NSError{
    print("> Emptying sandbox: Error emptying sandbox", error)
}

Answer 6

 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
...
}

Answer 7

它可能并不适用于所有情况，但通常将所有文件放在Documents Directory中的自定义目录中然后使用removeItemAtPath:error:删除该目录并再次创建它会更有效。 E.g：

// Clear cache
NSError *error;
[[NSFileManager defaultManager] removeItemAtPath:cacheDirectory error:&error];
if (error)
{
    // error handling
}

// Create cache directory again
NSError *error2;
[[NSFileManager defaultManager] createDirectoryAtPath:cacheDirectory withIntermediateDirectories:YES attributes:nil error:&error2];
if (error2)
{
    // error handling
}

删除iPhone沙箱中的所有文件（文档文件夹）？

7 个答案: