ios多線程的幾種創建方式

原文轉載自 http://my.oschina.net/u/936286/blog/159245







- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

{

    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];

     

    //創建線程的第一種方式

    NSThread *thread = [[NSThread alloc] initWithTarget:self selector:@selector(run:) object:@"universe"];

    [thread start];

    [thread release];

     

     

    //創建線程的第二種方式，NSThread類方法

    [NSThread detachNewThreadSelector:@selector(run:) toTarget:self withObject:@"yuzhou"];

     

     

    //創建線程的第三種方法  NSObject方法

    [self performSelectorInBackground:@selector(run:) withObject:@"nsobject thread"];

     

    //創建線程的第四種方式

    NSOperationQueue *oprationQueue = [[NSOperationQueue alloc] init];

    [oprationQueue addOperationWithBlock:^{

        //這個block語句塊在子線程中執行

        NSLog(@"oprationQueue");

    }];

    [oprationQueue release];

     

    //第五種創建線程的方式

    NSOperationQueue *oprationQueue1 = [[NSOperationQueue alloc] init];

    oprationQueue1.maxConcurrentOperationCount = 1;//指定池子的併發數

     

    //NSOperation 相當於java中的runnable接口，繼承自它的就相當一個任務

    NSInvocationOperation *invation = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(run:) object:@"invation"];

    [oprationQueue1 addOperation:invation];//將任務添加到池子裏面，可以給池子添加多個任務，並且指定它的併發數

    [invation release];

     

    //第二個任務

    NSInvocationOperation *invation2 = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(run2:) object:@"invocation2"];

    invation2.queuePriority = NSOperationQueuePriorityHigh;//設置線程優先級

    [oprationQueue1 addOperation:invation2];

    [invation2 release];

     

    [oprationQueue1 release];

     

    //調用主線程，用來子線程和主線程交互,最後面的那個boolean參數，如果爲yes就是等這個方法執行完了在執行後面的代碼；如果爲no的話，就是不管這個方法執行完了沒有，接着往下走

    [self performSelectorOnMainThread:@selector(onMain) withObject:self waitUntilDone:YES];

     

    //---------------------GCD----------------------支持多核，高效率的多線程技術

    //創建多線程第六種方式

    dispatch_queue_t queue = dispatch_queue_create("name", NULL);

    //創建一個子線程

    dispatch_async(queue, ^{

        // 子線程code... ..

        NSLog(@"GCD多線程");

         

        //回到主線程

        dispatch_sync(dispatch_get_main_queue(), ^{//其實這個也是在子線程中執行的，只是把它放到了主線程的隊列中

            Boolean isMain = [NSThread isMainThread];

            if (isMain) {

                NSLog(@"GCD主線程");

            }

        });

    });

     

     

    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(@"多線程運行:::%@",str);

}

- (void) run2:(NSString*)str

{

    NSLog(@"多線程運行:::%@",str);

}