如何实现ipad中googlemap的callout和Popover的动画效果

具体的效果就是点击callout中的rightCalloutAccessoryView(一个button)后,callout窗口以动画效果缩小,消失后又逐渐展开一个Popover. 我的代码是这样的: - (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView<MKAnnotation> *)view calloutAccessoryControlTapped:(UIControl *)control {     //[view dismissModalViewControllerAnimated:YES];     NSArray *anns = [[NSArray alloc] initWithArray:[_mapView selectedAnnotations]];     if ([anns count] > 0) {         //[[anns objectAtIndex:0] setSelected:NO animated:YES];         [_mapView deselectAnnotation:[anns objectAtIndex:0] animated:YES];     }     [anns release]; ......     cmccDetailController = [[CmccDetailController alloc]initWithNibName:@"CmccDetailController"                                                                   bundle:nil];     cmccDetailController.contentSizeForViewInPopover = CGSizeMake(490,200);     detailPopoverController = [[UIPopoverController alloc] initWithContentViewController:cmccDetailController]; //    [detailPopoverController setPopoverContentSize:CGSizeMake(400,280)];          [detailPopoverController presentPopoverFromRect:rect                                               inView:mapView                             permittedArrowDirections:UIPopoverArrowDirectionAny                                            animated:YES]; 问题一:为什么[_mapView deselectAnnotation:[anns objectAtIndex:0] animated:YES];与[detailPopoverController presentPopoverFromRect:rect                                               inView:mapView                             permittedArrowDirections:UIPopoverArrowDirectionAny                                            animated:YES]; 的animated参数都为YES了运行起来又没有动画效果? 问题二:如何实现googlemap中callout和popover的动画效果? 先谢谢各位了. 找到了这个  http://www.cocoachina.com/bbs/read.php?tid-11820-fpage-3.html,学习了. 谢谢cocoachina. 解决了,在ContentViewController的viewDidAppear:方法里加入动画即可. -(void)viewDidAppear:(BOOL)animated {     [super viewDidAppear:animated];     self.contentSizeForViewInPopover = CGSizeMake(335, 0);          [UIView beginAnimations:@"animationID" context:nil];     [UIView setAnimationDuration:0.5];     [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];          [UIView setAnimationRepeatAutoreverses:NO];          CGSize contentSize;     contentSize.width = self.contentSizeForViewInPopover.width;     contentSize.height = 192;     self.contentSizeForViewInPopover = contentSize;     [UIView commitAnimations]; } 我按着您的方法做了一下，点callout的rightCalloutAccessoryView， 展开了一个popover， 这个时候如果进行横屏和竖屏的切换，展开的popover的位置就乱了，而不像google map里面一样，这是什么原因呢