iOS 多线程详解

一、NSThread

1、创建方法三种

...

 /** 方法一，需要start */

 NSThread*thread1 = [[NSThreadalloc] initWithTarget:selfselector:@selector(doSomething1:) object:@"NSThread1"];

...

 // 线程加入线程池等待CPU调度，时间很快，几乎是立刻执行

    [thread1 start];

 /** 方法二，创建好之后自动启动 */

[NSThreaddetachNewThreadSelector:@selector(doSomething2:) toTarget:selfwithObject:@"NSThread2"];

/** 方法三，隐式创建，直接启动 */

[selfperformSelectorInBackground:@selector(doSomething3:) withObject:@"NSThread3"];

- (void)doSomething1:(NSObject*)object {

      // 传递过来的参数

      NSLog(@"%@",object);

      NSLog(@"doSomething1：%@",[NSThread currentThread]);

  }

  - (void)doSomething2:(NSObject*)object {

      NSLog(@"%@",object);

      NSLog(@"doSomething2：%@",[NSThread currentThread]);

  }

  - (void)doSomething3:(NSObject*)object {

      NSLog(@"%@",object);

      NSLog(@"doSomething3：%@",[NSThread currentThread]);

  }

2、打印当前线程：

  NSLog(@"doSomething----：%@",[NSThread currentThread]);

3、休眠：

   /** 休眠 */

    //休眠多久

     [NSThreadsleepForTimeInterval:2];

     //休眠到指定时间

     [NSThreadsleepUntilDate:[NSDatedate]];

4、设置优先级

     thread1.threadPriority;

二 、GCD（异步dispatch_async，同步dispatch_sync）