NSThread 的问题

Question

我有一个问题；在我的程序中，如果我调用 2 次

[self PerformSelectorOnMainThread:@selector(callDectectionMove:) withObject:[NSNumber numberWithInt:(int)i] waitUntilDone:false];

我是否创建了 2 个线程？ 因为在我的程序中我不确定是否创建 2 个线程。
谢谢

-(void)callDectectionMove:(NSNumber*)arrayIndex{

 NSMutableDictionary *myDictionary = [[NSMutableDictionary alloc] init];  
 [myDictionary setObject:arrayIndex forKey:@"arrayIndex"];  

 identificationMove *identifier = [[identificationMove alloc]init];
 [identifier setArrayIndex:(NSNumber*)arrayIndex];
 [identifier detectionMove];

 [identifier release];     
}


-(void)detectPositionMovement{


 for(int i = 0; i< [self.arrayMovement count]; i++){

  if((actualAccelerometerX+sensibilityMovement) > [[[[self.arrayMovement  objectAtIndex:i] arrayPositionMove]objectAtIndex:0] valueX] && (actualAccelerometerX-sensibilityMovement) < [[[[self.arrayMovement  objectAtIndex:i] arrayPositionMove]objectAtIndex:0] valueX] &&
     (actualAccelerometerY+sensibilityMovement) > [[[[self.arrayMovement  objectAtIndex:i] arrayPositionMove]objectAtIndex:0] valueY] && (actualAccelerometerY-sensibilityMovement) < [[[[self.arrayMovement  objectAtIndex:i] arrayPositionMove]objectAtIndex:0] valueY] &&
     (actualAccelerometerZ+sensibilityMovement) > [[[[self.arrayMovement  objectAtIndex:i] arrayPositionMove]objectAtIndex:0] valueZ] && (actualAccelerometerZ-sensibilityMovement) < [[[[self.arrayMovement  objectAtIndex:i] arrayPositionMove]objectAtIndex:0] valueZ])
   [self performSelectorOnMainThread:@selector(callDectectionMove:) withObject:[NSNumber numberWithInt:(int)i] waitUntilDone:false];

  }
}

Answer 1

performSelectorOnMainThread 方法不会创建新线程，它只会在主线程上分派选择器。创建新线程使用 detachNewThreadSelector:toTarget:withObject: