保存在缓存/快照中的快照

Question

**Hi every1，我的应用程序的快照正在缓存/快照文件夹中记录。出于安全考虑，我不需要记录这些快照。我使用了下面这段代码，它是我从net获得的，用来删除保存的快照：

- (void)applicationDidEnterBackground:(UIApplication *)application {
UIApplication* app = [UIApplication sharedApplication];
    UIBackgroundTaskIdentifier __block bgTask;
    bgTask = [app beginBackgroundTaskWithExpirationHandler:^{
        [app endBackgroundTask:bgTask];
        bgTask = UIBackgroundTaskInvalid;
    }];

    if(UIBackgroundTaskInvalid != bgTask) {
        // Start the long-running task to kill app after some secs and return immediately.
        dispatch_after( dispatch_time(DISPATCH_TIME_NOW, KILL_IN_BACKGROUND_AFTER_SECS * 1e09), 
                       dispatch_get_main_queue(), ^{
                           if(goingToQuit) exit(0);
                           [app endBackgroundTask: bgTask];
                       });
    }
}
- (void)applicationWillEnterForeground:(UIApplication *)application
{
    // cancel ongoing background suicide.
    goingToQuit = NO;

}

我不想记录这些快照，请对此提出建议。**

Answer 1

我认为您没有添加代码来删除文件:(请参考我的代码片段

- (void) deleteFiles {
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
        [self beingBackgroundUpdateTask];
        NSError *error = nil;
        // dirPath is path to your snapshot directory 
        NSArray *directoryContents = [fileMgr contentsOfDirectoryAtPath:dirPath 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
        }

        // Do something with the result 
       [self endBackgroundUpdateTask];
    });
}
- (void) beingBackgroundUpdateTask {
    self.backgroundUpdateTask = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:^{
        [self endBackgroundUpdateTask];
    }];
}

- (void) endBackgroundUpdateTask {
    [[UIApplication sharedApplication] endBackgroundTask: self.backgroundUpdateTask];
    self.backgroundUpdateTask = UIBackgroundTaskInvalid;
}