在地图上默认显示注解，不用点击大头针就出来

- (void)viewDidAppear:(BOOL)animated
{
??? [super viewDidAppear:animated];
??? [self addRestaurantAnnotation];
}

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?//下面一句话使得注解初始在上面显示。
??? [self.gooleMapView selectAnnotation:annotation animated:YES];
??? [annotationArray addObject:annotation];
??? [annotation release];
???
??? [_gooleMapView addAnnotations:annotationArray];