IOS： [self.tableView reloadData] doestn't reload the data - ios

Question

I am studying IOS by some tutorial.After I input some text in searchBar and click search, it send Http Request and parse the JSON data ,then display in tableView, But when I input some text in searchBar then click search ,the tableView show nothing .while I type anything again in searchBar,the tableView content display.
My question is ,How can I show the content when the first time I click search but not type anything again? Thank you~~
Here is my code :
- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar{
[searchBar resignFirstResponder];
searchResults = [NSMutableArray arrayWithCapacity:10];
isLoading =YES;
[self.tableView reloadData];
NSURL *url = [self urlWithSearchText: _searchBar.text];
NSString *jsonString = [self performStoreRequestwithUrl:url];
NSDictionary *dictionary = [self parseJSON: jsonString];
[self parseDictionary : dictionary];
[searchResults sortUsingSelector:#selector(compareName:)];
isLoading = NO;
[self.tableView reloadData];
}
- (NSInteger ) tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
if (isLoading) {
return 1;
}else if (searchResults == nil) {
return 0;
}else if([searchResults count] == 0 ){
return 1;
}else{
return [searchResults count];
}
}
- (UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
if (isLoading) {
return [self.tableView dequeueReusableCellWithIdentifier:LoadingCellIdentifier];
}
ResultCell *resultCell =(ResultCell *)[self.tableView
dequeueReusableCellWithIdentifier: #"ResultCell"];
UIImage *image = [UIImage imageNamed:#"TableCellGradient.png"];
UIImageView *backGroundView = [[UIImageView alloc] initWithImage: image];
UIImageView *selectedBackView = [[UIImageView alloc]initWithImage:
[UIImage imageNamed:#"SelectedTableCellGradient.png"]];
resultCell.backgroundView = backGroundView;
resultCell.selectedBackgroundView = selectedBackView;
if ([searchResults count]== 0) {
resultCell.nameLabel.text = #"Nothing Found";
resultCell.artistLabel.text = #"";
}else{
SearchResult * result = [searchResults objectAtIndex: indexPath.row];
resultCell.nameLabel.text = result.name;
NSString *kind = [self kindForDisplay:result.kind];
resultCell.artistLabel.text = [NSString stringWithFormat:#"%# (%#)",result.artistName,
kind];
}
return resultCell;
}