多线程的几中创建方法与基本使用

- (

BOOL

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

02

{

03

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

04

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//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

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//创建线程的第二种方式，NSThread类方法

12

[NSThread
detachNewThreadSelector:@selector(run:) toTarget:self withObject:@

"yuzhou"

];

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14

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//创建线程的第三种方法
NSObject方法

16

[self
performSelectorInBackground:@selector(run:) withObject:@

"nsobject
thread"

];

17

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//创建线程的第四种方式

19

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

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[oprationQueue
addOperationWithBlock:^{

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//这个block语句块在子线程中执行

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NSLog(@

"oprationQueue"

);

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}];

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[oprationQueue
release];

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//第五种创建线程的方式

27

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

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oprationQueue1.maxConcurrentOperationCount
= 1;

//指定池子的并发数

29

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//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"

];

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[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];

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//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];

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[invation2
release];

40

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[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

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//---------------------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);

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//创建一个子线程

50

dispatch_async(queue,
^{

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//
子线程code... ..

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NSLog(@

"GCD多线程"

);

53

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//回到主线程

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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"

);

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}

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});

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});

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

}

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}

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77

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-
(

void

)
run:(NSString*)str

79

{

80

NSLog(@

"多线程运行:::%@"

,str);

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}

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-
(

void

)
run2:(NSString*)str

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{

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NSLog(@

"多线程运行:::%@"

,str);

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}