objective-c - searchBar:shouldChangeTextInRange:replacementText 未调用

Question

searchBar :shouldChangeTextInRange:replacementText从未调用过。定义了委托，方法 - searchBarShouldBeginEditing:和searchBarTextDidBeginEditing : 工作正常， 但未调用shouldChangeTextInRange。我发现当在使用alertview的方法中设置时，并且在我尝试使用搜索栏之后..调用 shouldChangeTextInRange ......但之前没有

-(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

我错过了 appDelegate ，applicationDidFinishLauching下面的代码

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

现在 SearchBar 工作正常！