谢谢你们！

我最终在touchesBegan，touchesMoved和touchesEnded编写自定义代码，ot就像魅力一样。

I ended up writing custom code in touchesBegan, touchesMoved and touchesEnded and ot works like charm.

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{

    if ([touches count] == 2) {
        CGPoint nowPoint = [[touches anyObject] locationInView:self];
        if( nowPoint.x >= ALLOWED_X)
            swipeUp = YES;
    }

    [super touchesBegan:touches withEvent:event];
}


-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    [super touchesMoved:touches withEvent:event];

    if ([touches count] == 2 && swipeUp) {

        CGPoint nowPoint = [[touches anyObject] locationInView:self];
        CGPoint prevPoint = [[touches anyObject] previousLocationInView:self];

        if( nowPoint.x <= prevPoint.x && nowPoint.y <= prevPoint.y){
        }
        else {
            swipeUp = NO;
        }
    }
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    [super touchesEnded:touches withEvent:event];
    CGPoint nowPoint = [[touches anyObject] locationInView:self];

    if ([touches count] == 2 && swipeUp && nowPoint.x <= DELTA_X && nowPoint.y <= DELTA_Y) {
        NSLog(@"Invoke Method");
    }
    swipeUp = NO;
}

- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event {
    [super touchesCancelled:touches withEvent:event];
    swipeUp = NO;
}