Question

我正在进行线程处理....我遇到了这个：

 -(void)didRecieveResponse:(NSArray*)responseDic{

//Update DB status to '2', which means everything needs to b deleted
[[MediaService sharedInstance] updateMedia:2];
self.projectArray = responseDic;

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{



for (int j = 0; j<[self.projectArray count]; j++) {
 ProjectJsonModel *pModel = [self.projectArray objectAtIndex:j];

     [self parseArray:pModel.imageArray project:pModel ptype:1];

     [self parseArray:pModel.pdfArray project:pModel ptype:2];

     [self parseArray:pModel.videoArray project:pModel ptype:3];


 Media *tmpMedia = [[Media alloc] init];
 tmpMedia.projectId = pModel.projetId;
 tmpMedia.projectName  = pModel.projectName;
// NSLog(@"DB project naem = %@",pModel.projectName);
 tmpMedia.fileType = 4;
 tmpMedia.fileLink = NULL;
 tmpMedia.fileName = NULL;
 //NSURL *fileUrl = [NSURL URLWithString:tmpMedia.fileLink];
 //tmpMedia.fileName = [fileUrl lastPathComponent];
 tmpMedia.status = 4;

 [[MediaService sharedInstance] insertMedia:tmpMedia];
 [tmpMedia release];
 }

   [self checkDbForDownload];


dispatch_async(dispatch_get_main_queue(), ^(void) {

    //Stop your activity indicator or anything else with the GUI
    //Code here is run on the main thread

});
});

将所有在线数据存储到数据库中。它将显示在应用程序中。在检查更新时，应用程序停止工作。

在那个断点没有进入这个循环，为什么？

Answer 1

dispatch_async中的代码将异步运行。从外部代码块调试它将作为单行退出整个dispatch_async，并且不会进入其中的代码块。在for (int j = 0; j<[self.projectArray count]; j++) {中添加一个额外的断点，而不是从外部块进入以调试代码。这将阻止asyc后台线程在执行时停止。

指针未在dispatch_async中输入

1 个答案: