当我运行项目时尝试重新加载搜索字符串表时，我遇到了一个非常奇怪的问题
我收到错误消息：unexpectedly found nil while unwrapping an Optional value
代码是：
func tableView(tableView: UITableView!, numberOfRowsInSection section: Int) -> Int {
if tableView == self.searchDisplayController.searchResultsTableView {
return self.results.count
}
else {
return cells.count
}
}
func tableView(tableView: UITableView!, cellForRowAtIndexPath indexPath: NSIndexPath!) -> UITableViewCell! {
var cell :UITableViewCell = tableView.dequeueReusableCellWithIdentifier("addFriendCell") as UITableViewCell
var empty = UITableViewCell()
if cell == empty{
cell = UITableViewCell(style: UITableViewCellStyle.Default, reuseIdentifier: "addFriendCell")
}
if tableView == self.searchDisplayController.searchResultsTableView {
cell.textLabel.text = self.results[indexPath.row] as NSString
}
else{
cell.textLabel.text = cells[indexPath.row] as NSString
}
return cell
}
func filterContentForSearchText(searchText:NSString , scope : NSString){
var resultPredicate : NSPredicate = NSPredicate(format: "name contains[c]\(searchText)", argumentArray: nil)
self.results = self.cells.filteredArrayUsingPredicate(resultPredicate)
}
func searchDisplayController(controller: UISearchDisplayController!, shouldReloadTableForSearchString searchString: String!) -> Bool {
//self.filterContentForSearchText(searchString, scop§±±e: self.searchDisplayController.searchBar.scopeButtonTitles[self.searchDisplayController.searchBar.selectedScopeButtonIndex] as NSString)
self.filterContentForSearchText(searchString, scope: self.searchDisplayController.searchBar.scopeButtonTitles[self.searchDisplayController.searchBar.selectedScopeButtonIndex ] as NSString) // HERE IS WHERE I GET THE ERROR
return true
}
填充了单元格数组，但在搜索栏中输入字母时出现错误。
显然self.searchDisplayController.searchBar.scopeButtonTitles是零，为什么？
知道为什么吗？