ZipArchive阻塞主线程

Question

当使用ZipArchive解压一个包时，它似乎阻塞了主线程。压缩文件中大约有283个文件。我把它放在后台线程上，但它似乎没有帮助。

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, (unsigned long) NULL), ^{
    [self tryUnzipFile:fileName inContentPackage:contentPackage];
  });

- (void)tryUnzipFile:(NSString*)fileName inContentPackage:(MKContentPackage*)contentPackage {

  @synchronized (self) {
    NSString *filePath = [contentPackage zipFilePathForFile:fileName];
      BOOL unzipSucceeded = [self unzipFile:filePath toFolder:contentPackage.unzipFolder];
      if (unzipSucceeded) {
        [self excludeFromBackup:contentPackage.downloadFolder];
        NSLog(@"Content: Unzipping Content Package: %@ FileName: %@", contentPackage.identifier, fileName);
      }   
  }
}

- (BOOL)unzipFile:(NSString*)zipFilePath toFolder:(NSString*)zipFolder {
  ZipArchive *zipArchive = [[ZipArchive alloc] init];
  NSString* unzipPath = [NSObject documentFolderFrom:zipFolder fileName:@""];

  // Do the unzipping
  [zipArchive UnzipOpenFile:zipFilePath];
  BOOL unzipped = [zipArchive UnzipFileTo:unzipPath overWrite:YES];
  [zipArchive UnzipCloseFile];

  if (unzipped) {
    [self removeZipPackage:zipFilePath];
  }
  return unzipped;
}

上面的代码在解压时冻结屏幕大约5秒。我以为把它放在后台线程上会有帮助，但它没有。任何帮助都会很棒！

Answer 1

 @synchronized (self) {
    NSString *filePath = [contentPackage zipFilePathForFile:fileName];
      BOOL unzipSucceeded = [self unzipFile:filePath toFolder:contentPackage.unzipFolder];
      if (unzipSucceeded) {
        [self excludeFromBackup:contentPackage.downloadFolder];
        NSLog(@"Content: Unzipping Content Package: %@ FileName: %@", contentPackage.identifier, fileName);
      }   
  }

如果这个上下文中的"self“是您的View/ViewController，那么您应该考虑在synchronized块中使用另一个变量。