searchBar：shouldChangeTextInRange：replacementText不叫

Question

searchBar：shouldChangeTextInRange：replacementText從未調用過。該代表被定義，方法 - searchBarShouldBeginEditing：和searchBarTextDidBeginEditing：工作正常，但shouldChangeTextInRange未被調用。我發現，當值存取在使用alertview後，我的方法嘗試使用searchbar..the shouldChangeTextInRange叫...但在此之前沒有

-(void) searchBarTextDidBeginEditing:(UISearchBar *)searchBar { 
    } 

- (BOOL)searchBarShouldBeginEditing:(UISearchBar *)searchBar 
{ 
return YES; 
} 

-(BOOL)searchBar:(UISearchBar *)searchBar shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text 
{ 
return YES; 
} 


-(BOOL)searchBarShouldEndEditing:(UISearchBar *)searchBar { 
return YES; 
} 

-(void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText { 

    } 

Answer 1

我的appDelegate，已經錯過下面的代碼applicationDidFinishLauching

self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; 
[self.window makeKeyAndVisible]; 

現在的搜索欄工作正常！