ios-Multi-threading, organizing collections, creating multiple threads

-(BOOL) Application: (UIApplication *) application didfinishlaunchingwithoptions: (nsdictionary *) launchOptions{        Self.window = [[[UIWindow alloc] initwithframe:[[uiscreen mainscreen] bounds]] autorelease];    The first way to create a thread nsthread *thread = [[Nsthread alloc] initwithtarget:self selector: @selector (run:) object:@ "Universe"];    [Thread start];            [Thread release];            The second way to create a thread, the Nsthread class method [Nsthread detachnewthreadselector: @selector (run:) totarget:self withobject:@ "Yuzhou"];        The third method of creating a thread NSObject method [self performselectorinbackground: @selector (run:) withobject:@ "NSObject thread"];    The fourth way to create a thread nsoperationqueue *oprationqueue = [[Nsoperationqueue alloc] init];    [Oprationqueue addoperationwithblock:^{//This block statement chunk executes NSLog (@ "Oprationqueue") in the child thread;    }];        [Oprationqueue release];    Fifth ways to create threads nsoperationqueue *oprationqueue1 = [[Nsoperationqueue alloc] init];   Oprationqueue1.maxconcurrentoperationcount = 1;//The number of concurrent numbers for the specified pool     Nsoperation equivalent to the Runnable interface in Java, inherited from it is quite a task nsinvocationoperation *invation = [[Nsinvocationoperation alloc] In    Itwithtarget:self selector: @selector (run:) object:@ "Invation"];        [OprationQueue1 addoperation:invation];//adds a task to the pool and can add multiple tasks to the pool and specifies its concurrency [invation release]; The second task nsinvocationoperation *invation2 = [[Nsinvocationoperation alloc] initwithtarget:self selector: @selector (run2    :) object:@ "Invocation2"];    invation2.queuepriority = nsoperationqueuepriorityhigh;//Set Thread priority [OprationQueue1 Addoperation:invation2];        [Invation2 release];        [OprationQueue1 release]; Call the main thread, which is used for the sub-thread and the main thread to interact, the last side of the Boolean parameter, if yes is to wait for the method to execute after the execution of the Code; If no, it is no matter whether this method is finished or not, then go down [self        Performselectoronmainthread: @selector (Onmain) withobject:self Waituntildone:yes]; ---------------------GCD----------------------Support multi-core, high-efficiency multithreading technology//Create multithreading sixth way dispatch_queue_t queue = Dispatch_queue    _create ("name", NULL); Create a child thread Dispatch_async (queue, ^{//Child thread code .....                NSLog (@ "GCD multithreading"); Back to the main thread Dispatch_sync (Dispatch_get_main_queue (), ^{//actually this also executes in a sub-thread, just put it in the main thread of the queue Boolean ismain = [NST            Hread Ismainthread];            if (ismain) {NSLog (@ "GCD main thread");    }        });            });    Self.window.backgroundColor = [Uicolor Whitecolor];    [Self.window makekeyandvisible]; return YES;}    -(void) onmain{Boolean b = [Nsthread ismainthread]; if (b) {NSLog (@ "onmain;;    %d ", b); }}-(void) Run: (nsstring*) str{NSLog (@ "multithreaded run:::%@", str);} -(void) Run2: (nsstring*) str{NSLog (@ "multithreaded run:::%@", str);}



These are basic thread creation, using Nsthread to create threads is simpler, if a single creation thread can be used with nsthread. Direct creation can be used. Simply write the function and method of the thread execution to create a thread.