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NSThread
-(void)commonThread
{
/**
使用NSThread感觉不方便的地方就是每次使用线程都得创建一个新的方法。不过它的方法好记，简单易用，只是功能上有点弱。
*/
//NSThread的两种使用
//1.
NSThread *thread1 = [[NSThread alloc]initWithTarget:self selector:@selector(readNUm1) object:nil];
[thread1 start];
//2.
[NSThread detachNewThreadSelector:@selector(loadThreadArgumentWithStr:) toTarget:self withObject:@"argument"];
//回到主线程中做一些事情（UI只能在主线程中刷新，当然干点别的肯定也是可以的）
[self performSelectorOnMainThread:@selector(readNum2) withObject:nil waitUntilDone:NO];
//NSObject - 对象的某个方法可以直接在后台运行
[self performSelectorInBackground:@selector(loadThreadArgumentWithStr:) withObject:@"NSobjectThread"];
}
NSOperation&NSOperationQueue
//NSOperationQueue会建立一个线程管理器，每个加入到线程operation会有序的执行。
-(void)loadOperation
{
/**
[XXXXX new] ~= [[XXXX alloc]init] new是隐式调用了init,如果使用alloc/init 我们可以定制initXXX
*/
NSOperationQueue *queue = [NSOperationQueue new];
//设置线程最大并发数
[queue setMaxConcurrentOperationCount:2];
NSInvocationOperation *operation =[[NSInvocationOperation alloc] initWithTarget:self selector:@selector(threadReadNums) object:nil];
NSInvocationOperation *operation2 =[[NSInvocationOperation alloc] initWithTarget:self selector:@selector(threadReadNums2) object:nil];
NSInvocationOperation *operation3 =[[NSInvocationOperation alloc] initWithTarget:self selector:@selector(threadReadNums) object:nil];
[queue addOperation:operation];
[queue addOperation:operation2];
[queue addOperation:operation3];
NSBlockOperation *blockOperation = [NSBlockOperation blockOperationWithBlock:^{
for (int i=0; i<10; i ++)
{
NSLog(@"NSBlockOperation -->%zi",i);
}
}];
[queue addOperation:blockOperation];
}
添加依赖关系
-(void)AddPriorityOperation
{
NSOperationQueue *queue = [NSOperationQueue new];
NSBlockOperation *blockOperation1 = [NSBlockOperation blockOperationWithBlock:^{
NSLog(@"blockOperation 1");
}];
NSBlockOperation *blockOperation2 = [NSBlockOperation blockOperationWithBlock:^{
NSLog(@"blockOperation 2");
}];
NSBlockOperation *blockOperation3 = [NSBlockOperation blockOperationWithBlock:^{
NSLog(@"blockOperation 3");
}];
NSBlockOperation *blockOperation4 = [NSBlockOperation blockOperationWithBlock:^{
NSLog(@"blockOperation 4");
}];
NSBlockOperation *blockOperation5 = [NSBlockOperation blockOperationWithBlock:^{
NSLog(@"blockOperation 5");
}];
NSBlockOperation *blockOperation6 = [NSBlockOperation blockOperationWithBlock:^{
NSLog(@"blockOperation 6");
}];
[blockOperation6 setQueuePriority:NSOperationQueuePriorityHigh];
[blockOperation6 addDependency:blockOperation1];//依赖关系优于优先级的设定
[blockOperation1 addDependency:blockOperation2];
[blockOperation2 addDependency:blockOperation3];
[blockOperation3 addDependency:blockOperation4];
[blockOperation4 addDependency:blockOperation5];
[queue setMaxConcurrentOperationCount:6];
[queue addOperation:blockOperation1];
[queue addOperation:blockOperation2];
[queue addOperation:blockOperation3];
[queue addOperation:blockOperation4];
[queue addOperation:blockOperation5];
[queue addOperation:blockOperation6];
}
GCD的使用
1 -(void)dispatchMethods 2 { 3 //1.后台执行 4 dispatch_async(dispatch_get_global_queue(0, 0), ^{ 5 //dosomething 6 }); 7 //2.主线程执行 8 dispatch_async(dispatch_get_main_queue(), ^{ 9 //dosomething 10 }); 11 //3.一次执行 12 static dispatch_once_t onceToken; 13 dispatch_once(&onceToken, ^{ 14 //代码会被执行一次 15 }); 16 //4.延时执行 17 dispatch_time_t time = dispatch_time(DISPATCH_TIME_NOW, 2.0 * NSEC_PER_SEC); 18 dispatch_after(time, dispatch_get_main_queue(), ^(void){ 19 //2秒后执行 20 }); 21 dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{ 22 //2秒后执行 23 }); 24 //5.自定义方式 使用idspatch_queue_create方法 25 dispatch_queue_t urls_queue = dispatch_queue_create("url", NULL); 26 dispatch_async(urls_queue, ^{ 27 //执行代码 28 }); 29 //6.在后台并行执行多个线程，并在执行完后汇总执行结果， 30 //用dispatch_group,dispatch_async和dicpatch_group_notify实现 31 dispatch_group_t group = dispatch_group_create(); 32 dispatch_group_async(group, dispatch_get_global_queue(0, 0), ^{ 33 //线程任务一 34 }); 35 dispatch_group_async(group, dispatch_get_global_queue(0, 0), ^{ 36 //线程任务二 37 }); 38 dispatch_group_notify(group, dispatch_get_global_queue(0, 0), ^{ 39 //汇总结果。。。在所有group中的线程任务都完成后会执行该方法 40 }); 41 }
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原文地址：http://www.cnblogs.com/wlsxmhz/p/5396195.html
