FUCK, SHIT, etc. 一系列脏话，日了等。为啥，因为烦的要命。主要是碰到了一个问题，我要在UIsearchBar的左边加一个按钮，这样UISearchBar的width就变小窄了。但是每次点击Cancel的时候，UISearBar又填充了整个视图的宽度。如下图：

 

解决方法：

-(void)searchDisplayControllerWillBeginSearch:(UISearchDisplayController*)controller{
    // animate the search bar to the left ie. x=0[UIView animateWithDuration:0.25f animations:^{
   　　　　 CGRect frame = controller.searchBar.frame;        frame.origin.x =0;        controller.searchBar.frame = frame;} ]; // remove all toolbar items[self.toolbar setItems:nil animated:YES];}

-(void)searchDisplayControllerDidEndSearch:(UISearchDisplayController*)controller{// animate search bar back to its previous position and size// in my case it was x=55, y=1// and reduce its width by the amount moved, again 55px[UIView animateWithDuration:0.25f                           delay:0.0f// the UIViewAnimationOptionLayoutSubviews is IMPORTANT,// otherwise you get no animation// but some kind of snap-back movement                         options:UIViewAnimationOptionLayoutSubviews                      animations:^{CGRect frame =self.toolbar.frame;                         frame.origin.y =1;                         frame.origin.x =55;                         frame.size.width -=55;                         controller.searchBar.frame = frame;}                      completion:^(BOOL finished){// when finished, insert any tool bar items you had[self.toolbar setItems:[NSArray arrayWithObject:self.currentLocationButton] animated:YES];}];}

 如下效果：

 

 

 PS：

self.searchDisplayController.searchBar.frame=CGRectMake(10, 144, 152, 44); 这样不会改变SearchBar的宽度，需要将searchbar放在一个view上才可以。