多线程NSOperation

//多个线程并发执行  一般的时候会将多个线程放到队列中 由队列管理线程工作状态

{

    UIProgressView * progressView;

    NSOperationQueue * queue;

}

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

{

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

    // Override point for customization after application launch.

    self.window.backgroundColor = [UIColor whiteColor];

    progressView = [[UIProgressView alloc]initWithProgressViewStyle:UIProgressViewStyleDefault];

    progressView.frame = CGRectMake(10, 100, 300, 10);

    [self.window addSubview:progressView];

    

    UIButton * button = [UIButton buttonWithType:UIButtonTypeRoundedRect];

    button.frame = CGRectMake(100, 200, 100, 100);

    [button setTitle:@"线程进行" forState:UIControlStateNormal];

    [button addTarget:self action:@selector(buttonClick:) forControlEvents:UIControlEventTouchUpInside];

    [self.window addSubview:button];

    [self testThread];

    [self.window makeKeyAndVisible];

    return YES;

}

-(void)testThread

{

    //<1>创建队列的对象

    queue = [[NSOperationQueue alloc]init];

    //<2>设置队列中盛放的线程的最大个数

    [queue setMaxConcurrentOperationCount:4];

    //<3>队列中所有线程的优先级都是平等的

    //1、创建单独子线程

    NSInvocationOperation * test1 = [[NSInvocationOperation alloc]initWithTarget:self selector:@selector(threadMain1:) object:nil];

    //线程执行结束后触发下面的方法

    [test1 setCompletionBlock:^{

        NSLog(@"test1 执行结束");

    }];

    //将子线程放到队列中

    [queue addOperation:test1];

    //子线程放入队列中就会立即执行线程方法

    

    

    //2、创建block类型的线程

    NSBlockOperation * test2 = [NSBlockOperation blockOperationWithBlock:^{

        for (int i = 0 ; i<100; i++) {

            NSLog(@"test2 i = %d",i);

            [NSThread sleepForTimeInterval:0.1];

        }

    }];

    [queue addOperation:test2];

    [test2 setCompletionBlock:^{

        NSLog(@"test2 执行结束");

        //线程结束后，会从队列中移除

    }];

}

-(void)threadMain1:(id)arg

{

    for (int i = 0 ; i<100; i++) {

        NSLog(@"test1 %d",i);

        [NSThread sleepForTimeInterval:0.1];

    }

}

-(void)buttonClick:(id)sender

{

    progressView.progress = 0;

   // [NSThread detachNewThreadSelector:@selector(threadMain:) toTarget:self withObject:nil];

    NSInvocationOperation * test3 = [[NSInvocationOperation alloc]initWithTarget:self selector:@selector(threadMain:) object:nil];

    [test3 setCompletionBlock:^{

        NSLog(@"test3 结束");

    }];

}

-(void)threadMain:(id)arg

{

    for (int i = 0 ; i<100; i++) {

        [self performSelectorOnMainThread:@selector(changeThread:) withObject:@(i) waitUntilDone:NO];

        NSLog(@"progress:%f",progressView.progress);

        [NSThread sleepForTimeInterval:0.1];

    }

}

-(void)changeThread:(NSNumber *)num

{

    progressView.progress = num.intValue/100;

}