iOS开发多线程篇—创建线程

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

{

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

     

    //创建线程的第一种方式

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

    [thread start];

    [thread release];

     

     

    //创建线程的第二种方式，NSThread类方法

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

     

     

    //创建线程的第三种方法  NSObject方法

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

     

    //创建线程的第四种方式

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

    [oprationQueue addOperationWithBlock:^{

        //这个block语句块在子线程中执行

        NSLog(@"oprationQueue");

    }];

    [oprationQueue release];

     

    //第五种创建线程的方式

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

    oprationQueue1.maxConcurrentOperationCount = 1;//指定池子的并发数

     

    //NSOperation 相当于java中的runnable接口，继承自它的就相当一个任务

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

    [oprationQueue1 addOperation:invation];//将任务添加到池子里面，可以给池子添加多个任务，并且指定它的并发数

    [invation release];

     

    //第二个任务

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

    invation2.queuePriority = NSOperationQueuePriorityHigh;//设置线程优先级

    [oprationQueue1 addOperation:invation2];

    [invation2 release];

     

    [oprationQueue1 release];

     

    //调用主线程，用来子线程和主线程交互,最后面的那个boolean参数，如果为yes就是等这个方法执行完了在执行后面的代码；如果为no的话，就是不管这个方法执行完了没有，接着往下走

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

     

    //---------------------GCD----------------------支持多核，高效率的多线程技术

    //创建多线程第六种方式

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

    //创建一个子线程

    dispatch_async(queue, ^{

        // 子线程code... ..

        NSLog(@"GCD多线程");

         

        //回到主线程

        dispatch_sync(dispatch_get_main_queue(), ^{//其实这个也是在子线程中执行的，只是把它放到了主线程的队列中

            Boolean isMain = [NSThread isMainThread];

            if (isMain) {

                NSLog(@"GCD主线程");

            }

        });

    });

     

     

    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(@"多线程运行:::%@",str);

}

- (void) run2:(NSString*)str

{

    NSLog(@"多线程运行:::%@",str);

}