在Swift中清理AVCaptureSession

Question

我有一個使用AVCaptureSession在應用內拍照的Swift項目。我很難得到正確的語法來正確清理我的對象。在Obj-C中，建議的代碼如下：

// Releases the object - used for late session cleanup 
static void capture_cleanup(void* p) 
{ 
    NewPostPreviewViewController* csc = (NewPostPreviewViewController*)p; 
    [csc release]; // releases capture session if dealloc is called 
} 

// Stops the capture - this stops the capture, and upon stopping completion releases self. 
- (void)stopCapture { 
    // Retain self, it will be released in capture_cleanup. This is to ensure cleanup is done properly, 
    // without the object being released in the middle of it. 
    [self retain]; 

    // Stop the session 
    [session stopRunning]; 

    // Add cleanup code when dispatch queue end 
    dispatch_queue_t queue = dispatch_queue_create("VideoDataOutputQueue", NULL); 
    dispatch_set_context(queue, self); 
    dispatch_set_finalizer_f(queue, capture_cleanup); 
    [dataOutput setSampleBufferDelegate: self queue: queue]; 
    dispatch_release(queue); 
} 

終結會叫capture_cleanup，但我不知道如何設置上下文或指針capture_cleanup功能（甚至函數的定義是什麼樣子）

到目前爲止，我已經試過以下，但我不相信我甚至在正確的軌道上;

let p: UnsafeMutablePointer<NewPostPreviewViewController> = UnsafeMutablePointer.alloc(sizeof(NewPostPreviewViewController)) 
p.initialize(self) 

var videoDataOutputQueue = dispatch_queue_create("VideoDataOutputQueue", nil) 
dispatch_set_context(videoDataOutputQueue, p) 
dispatch_set_finalizer_f(videoDataOutputQueue, ????); 
self.videoDataOutput!.setSampleBufferDelegate(self, queue: videoDataOutputQueue) 
dispatch_release(videoDataOutputQueue) 

任何幫助轉換這將是最感謝！

Answer 1

使用橋接到Objective-C代碼解決。通過在我的Swift項目中包含一個CameraController.m Objective-C類（帶有關聯的頭文件），我可以橋接訪問相機源。

Objective-C類完成我需要的所有工作，並存儲最後拍攝的圖像。它也會在拍攝圖像時產生通知，允許我的Swift類觀察通知並獲取最後拍攝的圖像。