出現(xiàn)的問(wèn)題原因，從一個(gè)控制器modal到一個(gè)帶有搜索控制器，然后從搜索控制器返回的時(shí)候，會(huì)出現(xiàn)這個(gè)警告

Attempting to load the view of a view controller while it is deallocating is not allowed and may result in undefined behavior (<UISearchController: 0x154d39700>)

解決辦法：
Objective-C...

-(void)dealloc { 
    [searchController.view removeFromSuperview]; // It works!
}

Swift 3...

deinit {
    self.searchController.view.removeFromSuperview()
}

引用

Attempting to load the view of a view controller while it is deallocating… UISearchController