ios多线程的几种创建方式

转自  http://my.oschina.net/u/936286/blog/159245

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

02

{

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

04

05	//创建线程的第一种方式

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

07	[thread start];

08	[thread release];

09

10

11	//创建线程的第二种方式，NSThread类方法

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

13

14

15	//创建线程的第三种方法  NSObject方法

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

17

18	//创建线程的第四种方式

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

20	[oprationQueue addOperationWithBlock:^{

21	//这个block语句块在子线程中执行

22	NSLog(@"oprationQueue");

23

}];

24	[oprationQueue release];

25

26	//第五种创建线程的方式

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

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

29

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

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

32	[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

33	[invation release];

34

35

//第二个任务

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

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

38	[oprationQueue1 addOperation:invation2];

39	[invation2 release];

40

41	[oprationQueue1 release];

42

43	//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

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

45

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

47	//创建多线程第六种方式

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

49

//创建一个子线程

50	dispatch_async(queue, ^{

51	// 子线程code... ..

52	NSLog(@"GCD多线程");

53

54

//回到主线程

55	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

56	Boolean isMain = [NSThread isMainThread];

57	if (isMain) {

58	NSLog(@"GCD主线程");

59

}

60

});

61

});

62

63

64	self.window.backgroundColor = [UIColor whiteColor];

65	[self.window makeKeyAndVisible];

66	return YES;

67

}

68

69	- (void)onMain

70

{

71	Boolean b = [NSThread isMainThread];

72

if (b) {

73	NSLog(@"onMain;;%d",b);

74

}

75

}

76

77

78	- (void) run:(NSString*)str

79

{

80	NSLog(@"多线程运行:::%@",str);

81

}

82	- (void) run2:(NSString*)str

83

{

84	NSLog(@"多线程运行:::%@",str);

85

}