ios多線程的幾種建立方式

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
    
    //建立線程的第一種方式
    NSThread *thread = [[NSThread alloc] initWithTarget:self selector:@selector(run:) object:@"universe"];
    [thread start];
    [thread release];
    
    
    //建立線程的第二種方式，NSThread類方法
    [NSThread detachNewThreadSelector:@selector(run:) toTarget:self withObject:@"yuzhou"];
    
    
    //建立線程的第三種方法  NSObject方法
    [self performSelectorInBackground:@selector(run:) withObject:@"nsobject thread"];
    
    //建立線程的第四種方式
    NSOperationQueue *oprationQueue = [[NSOperationQueue alloc] init];
    [oprationQueue addOperationWithBlock:^{
        //這個block語句塊在子線程中執行
        NSLog(@"oprationQueue");
    }];
    [oprationQueue release];
    
    //第五種建立線程的方式
    NSOperationQueue *oprationQueue1 = [[NSOperationQueue alloc] init];
    oprationQueue1.maxConcurrentOperationCount = 1;//指定池子的併發數
    
    //NSOperation 至關於java中的runnable接口，繼承自它的就至關一個任務
    NSInvocationOperation *invation = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(run:) object:@"invation"];
    [oprationQueue1 addOperation:invation];//將任務添加到池子裏面，能夠給池子添加多個任務，而且指定它的併發數
    [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，若是爲yes就是等這個方法執行完了在執行後面的代碼；若是爲no的話，就是無論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
    //建立多線程第六種方式
    dispatch_queue_t queue = dispatch_queue_create("name", NULL);
    //建立一個子線程
    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);
}