iOS Development multithreaded article-creating threads

<span id="Label3"></p><p><p><strong>iOS Development multithreaded article-creating threads</strong></p></p><strong><strong>I. Simple instructions for creating and starting a thread</strong></strong><p><p>A Nsthread object represents a thread</p></p><p><p>creating, Starting Threads</p></p><p><p>(1) nsthread *thread = [[nsthread alloc] initwithtarget:self selector: @selector (run) object:nil];</p></p><p><p>[thread start];</p></p><p><p>When a thread is started, the Run method of self is executed in threads thread</p></p><p><p></p></p><p><p>Main thread related usage</p></p><p><p>+ (nsthread *) mainthread; Get the main thread</p></p><p><p>-(BOOL) ismainthread; is the main thread</p></p><p><p>+ (BOOL) ismainthread; is the main thread</p></p><p><p>Other usage</p></p><p><p>Get current thread</p></p><p><p>Nsthread *current = [nsthread currentthread];</p></p><p><p></p></p><p><p>Scheduling priority for a thread: the value of the scheduling priority is 0.0 ~ 1.0, The default is 0.5, the higher the value, the greater the priority</p></p><p><p>+ (double) threadpriority;</p></p><p><p>+ (BOOL) setthreadpriority: (double) p;</p></p><p><p></p></p><p><p>Set the name of the thread</p></p><p><p>-(void) setName: (nsstring *) n;</p></p><p><p>-(nsstring *) name;</p></p><p><p></p></p><p class="p0"><p class="p0">Other ways to create threads</p></p><p class="p0"><p class="p0">(2) automatically start thread after creating thread [nsthread detachnewthreadselector: @selector (run) totarget:self withobject:nil];</p></p><p class="p0"><p class="p0">(3) Create and start the thread implicitly [self performselectorinbackground: @selector (run) withobject:nil];</p></p><p class="p0"><p class="p0">Pros and cons of the above 2 ways to create threads</p></p><p class="p0"><p class="p0">Advantages: Simple and fast</p></p><p class="p0"><p class="p0">Cons: Unable to set the thread in more detail</p></p><p><p>second, code Example</p></p><p><p>1. Create it in an ancient way</p></p><span class="cnblogs_code_copy"><span class="cnblogs_code_copy"></span></span><pre><pre>9 #import "YYViewController.h" #import <pthread.h>12 @interface yyviewcontroller ()-(ibaction) btnclic k;16 @end17 @implementation YYViewController20 -(void) viewDidLoad23 { [super viewdidload];25 }26 28//button Click Event-(ibaction) btnclick { //1. get current thread nsthread *current=[nsthread currentthread];32 //main Thread NSLog (@ "btnclick----%@", current); //2. use a For loop to perform some time-consuming operations. pthread_t thread;37 pthread_create (&thread, null, run, null); 38}39 40 //c *run (void *data) the current thread, which is the newly created thread nsthread *current=[nsthread currentthread];46 (int i=0; i<10000; i++) { NSLog (@ "btnclick---%d---%@", i,current), }51 return null;52}53 54//multiple threads, Click the button to execute the button call method, the main thread is not blocked @end57 58 </pre></pre><span class="cnblogs_code_copy"><span class="cnblogs_code_copy"></span></span><p><p>Implementation Results:</p></p><p><p></p></p><p class="p0"><p class="p0"></p></p><p class="p0"><p class="p0">Printing results:</p></p><p class="p0"><p class="p0"></p></p><p class="p0"><p class="p0">2. Create a thread using Nsthread</p></p><span class="cnblogs_code_copy"><span class="cnblogs_code_copy"></span></span><pre> 8 9 #import "YYViewController.h" #import <pthread.h> @interface yyviewcontroller ()-(ibaction ) btnclick; @end @implementation yyviewcontroller-(void) viewdidload {[super viewdidload]; 23} 24 25 26//button Click event (ibaction) btnclick {28//1. get current thread nsthread *current=[nsthread currentthread]; 30//master Thread NSLog (@ "btnclick----%@", current); 32 33//get The main thread another way Nsthread *main=[nsthread mainthread]; NSLog (@ "main thread-------%@", main); 36 37//2. perform some time-consuming operations [self creatnsthread]; //[self creatNSThread2]; //[self creatNSThread3]; /** * Nsthread Create thread mode 1 * 1> first create initialization thread * 2> start open thread */-(void) creatnsthread 50 { Wuyi nsthread *thread=[[nsthread alloc]initwithtarget:self selector: @selector (run:) object:@ "thread a"]; 52//set a name for the thread [email protected] "thread a"; 54//open Threads [thread start]; Nsthread *thread2=[[Nsthread alloc]initwithtarget:self selector: @selector (run:) object:@ "thread b"]; 59//set a name for the thread [email protected] "thread b"; 61//open Thread [thread2 start]; /** * Nsthread Create thread mode 2 68 * Direct (auto) start of thread creation (automatic) (void) creatNSThread2//nsthread *t Hread=[nsthread detachnewthreadselector: @selector (run:) totarget:self withobject:@ "create thread Direct (auto) start"]; [nsthread D Etachnewthreadselector: @selector (run:) totarget:self withobject:@ "create thread Direct (auto) start"]; /** * Nsthread Create thread mode 3 81 * Implicitly creates thread and directly (automatically) starts A. */-(void) creatNSThread3 85 {86//in Background thread = = = Executes in a child thread [self performselectorinbackground: @selector (run:) withobject:@ "implicitly created"]; the "the" (void) run :(nsstring *) str 93 {94//get Current thread Nsthread *current=[nsthread currentthread]; 96//print output for (int i=0; i<10; I++) {98 NSLog (@ "run---%@---%@", current,str),}100}101 @end</pre><span class="cnblogs_code_copy"><span class="cnblogs_code_copy"></span></span><p class="p0"><p class="p0">Call Thread 1 and print the Result:</p></p><p class="p0"><p class="p0"></p></p><p class="p0"><p class="p0">Calling thread 2</p></p><p class="p0"><p class="p0"></p></p><p class="p0"><p class="p0">Calling thread 3</p></p><p class="p0"><p class="p0"></p></p><p><p>iOS Development multithreaded article-creating threads</p></p></span>