iOS 개발 멀티스레드 – 스레드 생성

NSThread *thread = [[NSThread alloc] initWithTarget:self selector:@selector(run:) object:nil];
[thread start];
//      ，     thread   self run  
//   object     run      

  + (NSThread *)mainThread; //      

  - (BOOL)isMainThread; //       

  + (BOOL)isMainThread; //       

NSThread *current = [NSThread currentThread];

 + (double)threadPriority;
 + (BOOL)setThreadPriority:(double)p;

 - (void)setName:(NSString *)n;
 - (NSString *)name;

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

 [self performSelectorInBackground:@selector(run) withObject:nil];

@interface ViewController ()
@property(nonatomic,strong)UIButton * button;
@end
@implementation ViewController
 - (void)viewDidLoad {
    [super viewDidLoad];
    [self.view addSubview:self.button];
}
 - (UIButton *)button
{
    if (_button == nil) {
        _button = [[UIButton alloc]initWithFrame:CGRectMake(100, 100, 100, 100)];
        _button.backgroundColor = [UIColor brownColor];
        [_button addTarget:self  action:@selector(buttonClick) forControlEvents:UIControlEventTouchUpInside];
    }
    return _button;
}
 - (void)buttonClick
{
    //      
   NSThread *current=[NSThread currentThread];
   //   
       NSLog(@"     ----%@",current);
    //            
   NSThread *main=[NSThread mainThread];
      NSLog(@"   -------%@",main);
         //        
    [self creatNSThread];
    //    [self creatNSThread2];
   //    [self creatNSThread3];
}
  /**
  * NSThread      1
  * 1>         
  * 2> start    
  */
  - (void)creatNSThread
{
     NSThread  *thread=[[NSThread alloc]initWithTarget:self selector:@selector(run:) object:@"  A"];
     //         
    thread.name=@"  A";
      //    
     [thread start];
    NSThread  *thread2=[[NSThread alloc]initWithTarget:self selector:@selector(run:) object:@"  B"];
     //         
    thread2.name=@"  B";
   //    
    [thread2 start];
}
 /**
  * NSThread      2
  *       (  )  
  */
 - (void)creatNSThread2
 {
//    NSThread *thread=[NSThread detachNewThreadSelector:@selector(run:) toTarget:self withObject:@"       (  )  "];
    
         [NSThread detachNewThreadSelector:@selector(run:) toTarget:self withObject:@"       (  )  "];
}
  /**
  * NSThread      3
  *       ,     (  )  
  */
  - (void)creatNSThread3
 {
        //        ===       
        [self performSelectorInBackground:@selector(run:) withObject:@"    "];
 }
  - (void)run:(NSString *)str
 {
        //      
         NSThread *current=[NSThread currentThread];
         //    
        for (int i=0; i<10; i++) {
             NSLog(@"run---%@---%@",current,str);
    }
}
 - (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
}
@end