我該如何阻止無用信息的即時搜索？

Question

我正在使用以下代碼使用uisearchbar，tableview和JSON Web服務進行搜索。目前的問題是，儘管應用程序正在搜索並在tableview中顯示數據，但是在搜索欄中每個文本都發生了變化之後，它正在搜索。我希望它只在用戶觸摸搜索按鈕後才能搜索。當它在uisearch文本字段中每次更改時都會查詢Web時，它似乎陷入困境。

這裏就是我要搜索：

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

    NSString *searchQuery = [NSString stringWithFormat:@"http://api.****/%@",searchText]; 

    NSString *jsonString = [NSString 
          stringWithContentsOfURL:[NSURL URLWithString:searchQuery] 
          encoding:NSStringEncodingConversionAllowLossy|NSUTF8StringEncoding 
          error:nil]; 

    NSMutableArray *itemsTMP = [[NSMutableArray alloc] init]; 

    SBJSON *parser = [[SBJSON alloc] init]; 
    NSDictionary *results = [parser objectWithString:jsonString error:nil]; 

    itemsTMP = [results objectForKey:@"results"]; 

    // [self setDisplayItems:[results objectForKey:@"results"]]; 

    [self setAllItems:[itemsTMP copy]]; 
    self.displayItems = [itemsTMP copy]; 

    int a = [displayItems count]; 
    NSString *countString = [NSString stringWithFormat:@"results %d",a]; 
    countLabel.text = countString; 

    [self.tableView reloadData]; 


} 

我在想也許代碼應該移到

-(void) searchBarSearchButtonClicked:(UISearchBar *)aSearchBar { 

    [self.searchBar resignFirstResponder]; 

    return; 
    // searchBar resigns after search clicked 

} 

，但不知道如何將:(NSString *)searchText添加到這個方法

感謝您的幫助

Answer 1

只需將textDidChange代碼到searchBarSearchButtonClicked方法解決您的問題。

-(void) searchBarSearchButtonClicked:(UISearchBar *)aSearchBar { 

    [self.searchBar resignFirstResponder]; 

    NSString *searchQuery = [NSString stringWithFormat:@"http://api.****/%@",aSearchBar.text]; 

    NSString *jsonString = [NSString 
          stringWithContentsOfURL:[NSURL URLWithString:searchQuery] 
          encoding:NSStringEncodingConversionAllowLossy|NSUTF8StringEncoding 
          error:nil]; 

    NSMutableArray *itemsTMP = [[NSMutableArray alloc] init]; 

    SBJSON *parser = [[SBJSON alloc] init]; 
    NSDictionary *results = [parser objectWithString:jsonString error:nil]; 

    itemsTMP = [results objectForKey:@"results"]; 

    // [self setDisplayItems:[results objectForKey:@"results"]]; 

    [self setAllItems:[itemsTMP copy]]; 
    self.displayItems = [itemsTMP copy]; 

    int a = [displayItems count]; 
    NSString *countString = [NSString stringWithFormat:@"results %d",a]; 
    countLabel.text = countString; 

    [self.tableView reloadData]; 

    return; 
    // searchBar resigns after search clicked 

}