UISearchbar上的“取消”按鈕

Question

我創建了帶有取消按鈕的UISearchbar ，但是當我單擊取消按鈕時，它不顯示數組，而只是關閉了鍵盤。

allItems是NSArray ， displayItems是NSMutableArray

-(void)searchBarSearchButtonClicked:(UISearchBar *)asearchBar{
[displayItems addObject:allItems];
[searchBar resignFirstResponder];
 }


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

if ([searchText length] == 0) {
    [displayItems removeAllObjects];
    [displayItems addObjectsFromArray:allItems];

} else {

    [displayItems removeAllObjects];
    for (NSString * string in allItems ){
        NSRange r =[string rangeOfString:searchText options:NSCaseInsensitiveSearch];

        if (r.location != NSNotFound){
            [displayItems addObject:string];
        }
    }

    [tableView reloadData];

} 

 }


       - (UITableViewCellAccessoryType)tableView:(UITableView *)tableView accessoryTypeForRowWithIndexPath:(NSIndexPath *)indexPath{
return UITableViewCellAccessoryDisclosureIndicator;
}

 -(void)searchBarCancelButtonClicked:(UISearchBar *)asearchBar{
[displayItems removeAllObjects];
[displayItems addObjectsFromArray:allItems];
[searchBar resignFirstResponder];
}
-(void)searchBarSearchButtonClicked:(UISearchBar *)asearchBar{
[searchBar resignFirstResponder];
}

Answer 1

您確實應該為此使用兩個數組。 一個NSArray稱為原始數據，另一個NSMutableArray稱為filteredData。 它們在開始時都是相同的，並且在過濾時，您將從原始Data數組構建/重建filteredData數組。 這是一個粗略的示例：

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

    if ([searchText length]) {
        [displayItems removeAllObjects];
        for (NSString * string in allItems ){
            NSRange r =[string rangeOfString:searchText options:NSCaseInsensitiveSearch];

            if (r.location != NSNotFound){
                [displayItems addObject:string];
            }

        [tableView performSelectorOnMainThread:@selector(reloadData) withObject:nil waitUntilDone:NO];
        }
    } 
}



-(void)searchBarCancelButtonClicked:(UISearchBar *)asearchBar{
    [searchBar resignFirstResponder];
    self.displayItems = [[NSMutableArray alloc] initWithArray:allItems];
    [tableView performSelectorOnMainThread:@selector(reloadData) withObject:nil waitUntilDone:NO]; 
}

我還為ScrollView （ TableView ）添加了一個委托方法，以便當滾動開始時，鍵盤被關閉：

#pragma mark - ScrollView (UITableView) delegate methods
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
    [mySearchBar resignFirstResponder];
}