NSThread问题

Question

我有一个问题;在我的程序，如果我调用2次

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

我创建2线程或不是？ 因为在我的程序中我不确定创建2个线程。
感谢

-(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

方法performSelectorOnMainThread不会创建新的线程，它只是在主线程分派选择。创建新线程使用detachNewThreadSelector:toTarget:withObject: