ios多线程的几种创建方式

- (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);
}