iOS中多线程相关方法——NSOperation及其相关类：

　　NSOperation

　　NSBlockOperation

　　NSInvocationOperation

　　NSOperationQueue

　　1.NSOperation:一般在使用NSOperation进行线程操作时，不常用该类，而是用他的子类或NSOperationQueue；当然，也可以使用他的block属性创建线程。

 1 @interface ViewController ()
 2 {
 3 @public
 4     int count;
 5 }
 6 @end
 7
 8 @implementation ViewController
 9 - (void)viewDidLoad {
10     [super viewDidLoad];
11
12     NSLog(@"==Start==");
13
14     count = 0;
15     for (int i = 0; i < 10; i++) {
16         NSOperation *opration = [[NSOperation alloc] init];
17         opration.completionBlock = ^(){
18             NSLog(@"%@ = %@", @"operation_block", [NSThread currentThread]);
19         };
20         // 开启多线程
21         [opration start];
22     }
23
24     NSLog(@"==End==");
25 }
26
27 - (void)action:sender{
28     count ++;
29     NSLog(@"%@[%d] = %@", sender, count, [NSThread currentThread]);
30 }
31 @end    

2016-04-18 10:10:42.563 Demo_NSOperation[1461:47803] ==Start==                                                              2016-04-18 10:10:42.564 Demo_NSOperation[1461:47803] ==End==                                                                2016-04-18 10:10:42.564 Demo_NSOperation[1461:47978] operation_block = <NSThread: 0x7fff32602320>{number = 2, name = (null)}2016-04-18 10:10:42.564 Demo_NSOperation[1461:47979] operation_block = <NSThread: 0x7fff3274a470>{number = 3, name = (null)}2016-04-18 10:10:42.564 Demo_NSOperation[1461:47982] operation_block = <NSThread: 0x7fff3240a940>{number = 5, name = (null)}2016-04-18 10:10:42.564 Demo_NSOperation[1461:47984] operation_block = <NSThread: 0x7fff32402e10>{number = 4, name = (null)}2016-04-18 10:10:42.565 Demo_NSOperation[1461:47978] operation_block = <NSThread: 0x7fff32602320>{number = 2, name = (null)}2016-04-18 10:10:42.565 Demo_NSOperation[1461:47979] operation_block = <NSThread: 0x7fff3274a470>{number = 3, name = (null)}2016-04-18 10:10:42.566 Demo_NSOperation[1461:47985] operation_block = <NSThread: 0x7fff32605a70>{number = 6, name = (null)}2016-04-18 10:10:42.566 Demo_NSOperation[1461:47982] operation_block = <NSThread: 0x7fff3240a940>{number = 5, name = (null)}2016-04-18 10:10:42.566 Demo_NSOperation[1461:47984] operation_block = <NSThread: 0x7fff32402e10>{number = 4, name = (null)}2016-04-18 10:10:42.567 Demo_NSOperation[1461:47978] operation_block = <NSThread: 0x7fff32602320>{number = 2, name = (null)}

　　2.NSBlockOperation:是NSOperation的子类

 1 @interface ViewController ()
 2 {
 3     @public
 4     int count;
 5 }
 6 @end
 7
 8 @implementation ViewController
 9
10 - (void)viewDidLoad {
11     [super viewDidLoad];
12
13     NSLog(@"==Start==");
14
15     count = 0;
16     for (int i = 0; i < 10; i++) { // 直接使用NSBlockOperation的类方法
17         NSBlockOperation *blockOperation = [NSBlockOperation blockOperationWithBlock:^{
18             NSLog(@"%@ = %@", @"blockOperation", [NSThread currentThread]);
19         }];
20
21         [blockOperation start];
22     }
23
24     NSLog(@"==End==");
25 }
26
27 - (void)action:sender{
28     count ++;
29     NSLog(@"%@[%d] = %@", sender, count, [NSThread currentThread]);
30 }
31 @end

2016-04-18 12:04:03.893 Demo_NSOperation[2103:104349] ==Start==                                                           2016-04-18 12:04:03.894 Demo_NSOperation[2103:104349] blockOperation = <NSThread: 0x7fb3f3502930>{number = 1, name = main}2016-04-18 12:04:03.894 Demo_NSOperation[2103:104349] blockOperation = <NSThread: 0x7fb3f3502930>{number = 1, name = main}2016-04-18 12:04:03.894 Demo_NSOperation[2103:104349] blockOperation = <NSThread: 0x7fb3f3502930>{number = 1, name = main}2016-04-18 12:04:03.894 Demo_NSOperation[2103:104349] blockOperation = <NSThread: 0x7fb3f3502930>{number = 1, name = main}2016-04-18 12:04:03.894 Demo_NSOperation[2103:104349] blockOperation = <NSThread: 0x7fb3f3502930>{number = 1, name = main}2016-04-18 12:04:03.895 Demo_NSOperation[2103:104349] blockOperation = <NSThread: 0x7fb3f3502930>{number = 1, name = main}2016-04-18 12:04:03.895 Demo_NSOperation[2103:104349] blockOperation = <NSThread: 0x7fb3f3502930>{number = 1, name = main}2016-04-18 12:04:03.895 Demo_NSOperation[2103:104349] blockOperation = <NSThread: 0x7fb3f3502930>{number = 1, name = main}2016-04-18 12:04:03.895 Demo_NSOperation[2103:104349] blockOperation = <NSThread: 0x7fb3f3502930>{number = 1, name = main}2016-04-18 12:04:03.895 Demo_NSOperation[2103:104349] blockOperation = <NSThread: 0x7fb3f3502930>{number = 1, name = main}2016-04-18 12:04:03.895 Demo_NSOperation[2103:104349] ==End==                                                             

 1 @interface ViewController ()
 2 {
 3     @public
 4     int count;
 5 }
 6 @end
 7
 8 @implementation ViewController
 9 - (void)viewDidLoad {
10     [super viewDidLoad];
11
12     NSLog(@"==Start==");
13
14     count = 0;
15     for (int i = 0; i < 5; i++) {
16         NSBlockOperation *blockOperation = [NSBlockOperation new];
17         // 使用NSBlockOperation的实例方法
18         [blockOperation addExecutionBlock:^{
19             NSLog(@"%@ = %@", @"blockOperation1", [NSThread currentThread]);
20         }];
21
22         [blockOperation addExecutionBlock:^{
23             NSLog(@"%@ = %@", @"blockOperation2", [NSThread currentThread]);
24         }];
25
26         [blockOperation addExecutionBlock:^{
27             NSLog(@"%@ = %@", @"blockOperation3", [NSThread currentThread]);
28         }];
29
30         [blockOperation start];
31     }
32
33     NSLog(@"==End==");
34 }
35
36 - (void)action:sender{
37     count ++;
38     NSLog(@"%@[%d] = %@", sender, count, [NSThread currentThread]);
39 }
40 @end

2016-04-18 14:07:23.518 Demo_NSOperation[2797:178037] ==Start==                                                              2016-04-18 14:07:23.520 Demo_NSOperation[2797:178037] blockOperation1 = <NSThread: 0x7f9019e02610>{number = 1, name = main}  2016-04-18 14:07:23.520 Demo_NSOperation[2797:178070] blockOperation3 = <NSThread: 0x7f9019f13620>{number = 2, name = (null)}2016-04-18 14:07:23.520 Demo_NSOperation[2797:178069] blockOperation2 = <NSThread: 0x7f9019c0bf50>{number = 3, name = (null)}2016-04-18 14:07:23.521 Demo_NSOperation[2797:178037] blockOperation1 = <NSThread: 0x7f9019e02610>{number = 1, name = main}  2016-04-18 14:07:23.521 Demo_NSOperation[2797:178070] blockOperation3 = <NSThread: 0x7f9019f13620>{number = 2, name = (null)}2016-04-18 14:07:23.521 Demo_NSOperation[2797:178069] blockOperation2 = <NSThread: 0x7f9019c0bf50>{number = 3, name = (null)}2016-04-18 14:07:23.522 Demo_NSOperation[2797:178037] blockOperation1 = <NSThread: 0x7f9019e02610>{number = 1, name = main}  2016-04-18 14:07:23.522 Demo_NSOperation[2797:178070] blockOperation3 = <NSThread: 0x7f9019f13620>{number = 2, name = (null)}2016-04-18 14:07:23.522 Demo_NSOperation[2797:178069] blockOperation2 = <NSThread: 0x7f9019c0bf50>{number = 3, name = (null)}2016-04-18 14:07:23.523 Demo_NSOperation[2797:178037] blockOperation1 = <NSThread: 0x7f9019e02610>{number = 1, name = main}  2016-04-18 14:07:23.523 Demo_NSOperation[2797:178070] blockOperation2 = <NSThread: 0x7f9019f13620>{number = 2, name = (null)}2016-04-18 14:07:23.523 Demo_NSOperation[2797:178069] blockOperation3 = <NSThread: 0x7f9019c0bf50>{number = 3, name = (null)}2016-04-18 14:07:23.524 Demo_NSOperation[2797:178037] blockOperation1 = <NSThread: 0x7f9019e02610>{number = 1, name = main}  2016-04-18 14:07:23.524 Demo_NSOperation[2797:178070] blockOperation3 = <NSThread: 0x7f9019f13620>{number = 2, name = (null)}2016-04-18 14:07:23.524 Demo_NSOperation[2797:178069] blockOperation2 = <NSThread: 0x7f9019c0bf50>{number = 3, name = (null)}2016-04-18 14:07:23.524 Demo_NSOperation[2797:178037] ==End==

　　3.NSInvocationOperation：是NSOperation的子类

 1 @interface ViewController ()
 2 {
 3     @public
 4     int count;
 5 }
 6 @end
 7
 8 @implementation ViewController
 9 - (void)viewDidLoad {
10     [super viewDidLoad];
11
12     NSLog(@"==Start==");
13
14     count = 0;
15     for (int i = 0; i < 5; i++) {
16         // 使用构造方法
17         NSInvocationOperation *invocationOperation = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(action:) object:@"invocationOperation"];
18         // 使用实例方法
19         [invocationOperation setCompletionBlock:^{
20             NSLog(@"%@ %@", @"iop", [NSThread currentThread]);
21         }];
22
23         [invocationOperation start];
24     }
25
26     NSLog(@"==End==");
27 }
28
29 - (void)action:sender{
30     count ++;
31     NSLog(@"%@[%d] = %@", sender, count, [NSThread currentThread]);
32 }
33 @end

2016-04-18 14:18:41.245 Demo_NSOperation[2929:183996] ==Start==                                                                   2016-04-18 14:18:41.246 Demo_NSOperation[2929:183996] invocationOperation[1] = <NSThread: 0x7fe0c3506ed0>{number = 1, name = main}2016-04-18 14:18:41.247 Demo_NSOperation[2929:183996] invocationOperation[2] = <NSThread: 0x7fe0c3506ed0>{number = 1, name = main}2016-04-18 14:18:41.247 Demo_NSOperation[2929:183996] invocationOperation[3] = <NSThread: 0x7fe0c3506ed0>{number = 1, name = main}2016-04-18 14:18:41.247 Demo_NSOperation[2929:183996] invocationOperation[4] = <NSThread: 0x7fe0c3506ed0>{number = 1, name = main}2016-04-18 14:18:41.247 Demo_NSOperation[2929:184167] iop <NSThread: 0x7fe0c3704110>{number = 2, name = (null)}                   2016-04-18 14:18:41.247 Demo_NSOperation[2929:183996] invocationOperation[5] = <NSThread: 0x7fe0c3506ed0>{number = 1, name = main}2016-04-18 14:18:41.248 Demo_NSOperation[2929:183996] ==End==                                                                     2016-04-18 14:18:41.248 Demo_NSOperation[2929:184170] iop <NSThread: 0x7fe0c3704180>{number = 4, name = (null)}                   2016-04-18 14:18:41.247 Demo_NSOperation[2929:184171] iop <NSThread: 0x7fe0c3417940>{number = 3, name = (null)}                   2016-04-18 14:18:41.248 Demo_NSOperation[2929:184167] iop <NSThread: 0x7fe0c3704110>{number = 2, name = (null)}                   2016-04-18 14:18:41.248 Demo_NSOperation[2929:184177] iop <NSThread: 0x7fe0c36093a0>{number = 5, name = (null)}

　　无论是NSBlockOperation的类方法还是NSInvocationOperation实例方法都在主线程中执行；而使用addExecutionBlock方法则会在主线程及子线程中运行；使用setCompletionBlock方法则会开辟多线程。

　　4.NSOperationQueue:并不是NSOperation的子类，但是常与NSOperation搭配使用，加入queue的操作会开辟子线程处理

 1 @interface ViewController ()
 2 {
 3     @public
 4     int count;
 5 }
 6 @end
 7
 8 @implementation ViewController
 9
10 - (void)viewDidLoad {
11     [super viewDidLoad];
12
13     NSLog(@"==Start==");
14
15     count = 0;
16     NSOperationQueue *queue = [[NSOperationQueue alloc] init];
17     NSInvocationOperation *operation = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(action:) object:@"operationQueue"];
18     NSInvocationOperation *operation1 = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(action:) object:@"operationQueue1"];
19     NSInvocationOperation *operation2 = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(action:) object:@"operationQueue2"];
20     [queue addOperations:@[operation, operation1, operation2] waitUntilFinished:YES];
21
22     NSLog(@"==End==");
23 }
24
25 - (void)action:sender{
26     count ++;
27     NSLog(@"%@[%d] = %@", sender, count, [NSThread currentThread]);
28 }
29 @end

2016-04-18 15:03:12.566 Demo_NSOperation[3259:201876] ==Start==               　　　　　　　　　　　　　　　　　　　　　　　　          2016-04-18 15:03:12.567 Demo_NSOperation[3259:202092] operationQueue2[2] = <NSThread: 0x7fa791c1fe60>{number = 4, name = (null)}2016-04-18 15:03:12.567 Demo_NSOperation[3259:202072] operationQueue[3] = <NSThread: 0x7fa791e05a80>{number = 3, name = (null)} 2016-04-18 15:03:12.567 Demo_NSOperation[3259:202070] operationQueue1[1] = <NSThread: 0x7fa791d48370>{number = 2, name = (null)}2016-04-18 15:03:12.568 Demo_NSOperation[3259:201876] ==End==

　　NSOperation中含有@property NSOperationQueuePriority queuePriority;和@property NSQualityOfService qualityOfService;的枚举属性，可选择线程的优先级以及子线程开辟方式。

转载于:https://www.cnblogs.com/kriskee/p/5404564.html

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