Question

这个问题似乎被多次询问，但我找不到对我的问题的好答案。

基本上autoreleasepool使用的内存似乎不会在函数调用之后立即释放，而是在内存中保留一段时间，如果在for循环中多次调用它，最终会导致应用程序崩溃。

我也试过release无济于事（如果我做错了，请告诉我。）

cumsum

我的问题是在函数调用之后我怎么能// let _ = selectedImages.map { $0.localSync() } for index in 0..<selectedImages.count { autoreleasepool { () -> Void in let _ = selectedImages[index].localSync() } } func localSync() -> SyncStatus { let documentsDirectory = FileManager.default.urls(for: .documentDirectory, in:.userDomainMask).first! let dataPath = documentsDirectory.appendingPathComponent("Images", isDirectory: true) try! FileManager.default.createDirectory(atPath: dataPath.path, withIntermediateDirectories: true, attributes: nil) let uuid = NSUUID().uuidString let imagePath = dataPath.appendingPathComponent("\(uuid).jpg") if self.syncStatus != .no && self.syncStatus != .localError { // self.localPath == nil return self.syncStatus } if let data = UIImageJPEGRepresentation(self.image, 0.96), let _ = try? data.write(to: imagePath) { self.localPath = imagePath self.syncStatus = .localOk self.image = nil } else { self.localPath = nil self.syncStatus = .localError } return self.syncStatus }那段内存。贝娄你会找到相关的代码：

    //Class Properties
    var currentPage = 0
    var previousPage = 0

func scrollViewDidEndDragging(scrollView: UIScrollView, willDecelerate decelerate: Bool) {
        updatePage(scrollView)
        return
    }

 func scrollViewDidEndDecelerating(scrollView: UIScrollView){
        updatePage(scrollView)
        return
    }


 func updatePage(scrollView: UIScrollView) {
        let pageWidth:CGFloat = scrollView.frame.width
        let current:CGFloat = floor((scrollView.contentOffset.x-pageWidth/2)/pageWidth)+1
        currentPage = Int(current)

        if currentPage == 0 {
              // DO SOMETHING
        }
        else if currentPage == 1{
              // DO SOMETHING

        }
    }

func scrollViewDidEndScrollingAnimation(scrollView: UIScrollView) {
     if previousPage != currentPage {
          previousPage = currentPage
          if currentPage == 0 {
              //DO SOMETHING
             }else if currentPage == 1 {
               // DO SOMETHING
           }
       }
   }

Answer 1

您可以尝试创建一个OperationQueue，maxConcurrentOperationCount设置为1.我遇到了这样的问题，它对我有用。

lazy var imgSyncQueue: OperationQueue = {
    var queue = OperationQueue()
    queue.name = "Image Sync Queue"
    queue.maxConcurrentOperationCount = 1
    return queue
}()

然后将操作添加到此队列

imgUploadQueue.addOperation(BlockOperation(block: { /*sync code here*/ })

UIImageJPEGRepresentation内存问题

1 个答案: