在Apple文档中，它说:Important: Youshouldnevercallthedispatch_syncordispatch_sync_ffunctionfromataskthatisexecutinginthesamequeuethatyouareplanningtopasstothefunction.Thisisparticularlyimportantforserialqueues,whichareguaranteedtodeadlock,butshouldalsobeavoidedforconcurrentqueues.您如何编写代码来做到这一点？
在Apple文档中，它说:Important: Youshouldnevercallthedispatch_syncordispatch_sync_ffunctionfromataskthatisexecutinginthesamequeuethatyouareplanningtopasstothefunction.Thisisparticularlyimportantforserialqueues,whichareguaranteedtodeadlock,butshouldalsobeavoidedforconcurrentqueues.您如何编写代码来做到这一点？
UINavigationController的文档不包含带有completion:参数的pushViewController方法。 最佳答案 更好的解决方案是用CATransaction包装推送动画并设置completionBlock。无需处理时间问题。[CATransactionbegin];[CATransactionsetCompletionBlock:^{//whateveryouwanttodoafterthepush}];[[selfnavigationController]pushViewController:view
UINavigationController的文档不包含带有completion:参数的pushViewController方法。 最佳答案 更好的解决方案是用CATransaction包装推送动画并设置completionBlock。无需处理时间问题。[CATransactionbegin];[CATransactionsetCompletionBlock:^{//whateveryouwanttodoafterthepush}];[[selfnavigationController]pushViewController:view
我有以下(伪)代码:-(void)testAbc{[someThingretrieve:@"foo"completion:^{NSArray*names=@[@"John",@"Mary",@"Peter",@"Madalena"];for(NSStringnameinnames){[someObjectlookupName:namecompletion:^(NSString*urlString){//A.Somethingthattakesafewsecondstocomplete.}];//B.NeedtowaithereuntilAiscompleted.}}];//C.Need
我有以下(伪)代码:-(void)testAbc{[someThingretrieve:@"foo"completion:^{NSArray*names=@[@"John",@"Mary",@"Peter",@"Madalena"];for(NSStringnameinnames){[someObjectlookupName:namecompletion:^(NSString*urlString){//A.Somethingthattakesafewsecondstocomplete.}];//B.NeedtowaithereuntilAiscompleted.}}];//C.Need
我为NSThread和GrandCentralDispatch(GCD)创建了一些测试代码:-(void)doIt:(NSNumber*)i{sleep(1);NSLog(@"Thread#%i",[iintValue]);}-(IBAction)doWork:(id)sender{for(inti=0;10>i;i++){NSNumber*t=[NSNumbernumberWithInt:i];[NSThreaddetachNewThreadSelector:@selector(doIt:)toTarget:selfwithObject:t];}sleep(1);dispatch_q
我为NSThread和GrandCentralDispatch(GCD)创建了一些测试代码:-(void)doIt:(NSNumber*)i{sleep(1);NSLog(@"Thread#%i",[iintValue]);}-(IBAction)doWork:(id)sender{for(inti=0;10>i;i++){NSNumber*t=[NSNumbernumberWithInt:i];[NSThreaddetachNewThreadSelector:@selector(doIt:)toTarget:selfwithObject:t];}sleep(1);dispatch_q
问题描述部署WEB项目后，开启了强制HTTPS，产生如下错误：MixedContent:Thepageat'https://ask.mllt.vip/index.php/data1.html'wasloadedoverHTTPS,butrequestedaninsecurefavicon'http://ask.mllt.vip/imgs/profile.png'.Thisrequesthasbeenblocked;thecontentmustbeservedoverHTTPS.问题分析报错的原因就是当前页面是https协议加载的，但是这个页面发起了一个http的ajax请求，这种做法是非法的。
这可能是个愚蠢的问题，但我需要自己问清楚这个问题。要将block提交到队列中以供执行，请使用函数dispatch_sync和dispatch_async。它们都将队列和block作为参数。dispatch_async立即返回，异步运行block，而dispatch_sync阻塞执行直到提供的block返回。以下是一些情况:情况一dispatch_queue_tqueue=dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0ul);dispatch_async(queue,^{[selfgoDoSomethingLongA
