在storyboard中的静态UITableView中拖入 UISearchBar and Search Display Controller出现的奇怪问题

     近期学习过程中想模拟一下新浪微博“发现”界面。

     我在storyboard中拖入一个UITableViewController，设置这个UITableViewController的TableView为Static Cells，然后加入了两个Section，每一个Section两行Cell。

     接下来往这个TableView中拖入了一个UISearchBar and Search Display Controller，storyboard中的结构例如以下图：

    

    

     然后在UITableViewController相应的WBDiscoverTableViewController.m中实现相关的协议方法。代码例如以下：

#import "WBDiscoverTableViewController.h"

@interface WBDiscoverTableViewController ()
@property (weak, nonatomic) IBOutlet UISearchBar *mySearchbar;
@property (nonatomic, strong) NSArray *results;
@property (weak, nonatomic) IBOutlet UITableViewCell *hotTopicsCell1;
@property (weak, nonatomic) IBOutlet UITableViewCell *hotTopicsCell2;
@property (weak, nonatomic) IBOutlet UITableViewCell *nearbyPeopleCell;
@property (weak, nonatomic) IBOutlet UITableViewCell *nearbyWeiboCell;
@end

@implementation WBDiscoverTableViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    static NSString *cellID = @"resultCell";
    [self.searchDisplayController.searchResultsTableView registerClass:[UITableViewCell class] forCellReuseIdentifier:cellID];
}

- (void)viewWillAppear:(BOOL)animated {

}

- (void)searchWithString {
    switch (self.mySearchbar.selectedScopeButtonIndex) {
        case 0:
            //搜用户
            if ([[NSUserDefaults standardUserDefaults] objectForKey:@"accessToken"]) {
                [[WBWeiboAPI shareWeiboApi] searchSuggestionsUsersWithString:self.mySearchbar.text AndCount:20 CompletionCallBack:^(id obj) {
                    self.results = obj;
                    dispatch_async(dispatch_get_main_queue(), ^{
                        NSLog(@"self.results.count :%ld", self.results.count);
                        [self.searchDisplayController.searchResultsTableView reloadData];
                    });
                   
                }];
            }
            break;
        case 1:
            //搜学校
            if ([[NSUserDefaults standardUserDefaults] objectForKey:@"accessToken"]) {
                [[WBWeiboAPI shareWeiboApi] searchSuggestionsSchoolsWithString:self.mySearchbar.text AndCount:20 AndType:0 CompletionCallBack:^(id obj) {
                    self.results = obj;
                    dispatch_async(dispatch_get_main_queue(), ^{
                        NSLog(@"self.results.count :%ld", self.results.count);
                        [self.searchDisplayController.searchResultsTableView reloadData];
                    });
                }];
            }
            break;
        case 2:
            //搜公司
            if ([[NSUserDefaults standardUserDefaults] objectForKey:@"accessToken"]) {
                [[WBWeiboAPI shareWeiboApi] searchSuggestionsCompaniesWithString:self.mySearchbar.text AndCount:20 CompletionCallBack:^(id obj) {
                    self.results = obj;
                    dispatch_async(dispatch_get_main_queue(), ^{
                        NSLog(@"self.results.count :%ld", self.results.count);
                        [self.searchDisplayController.searchResultsTableView reloadData];
                    });
                }];
            }
            break;
        default:
            break;
    }
}

#pragma mark UISearchBarDelegate

- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar {
    [self searchWithString];
   
}

#pragma mark UISearchDisplayDelegate

- (void)searchDisplayControllerWillBeginSearch:(UISearchDisplayController *)controller {
    NSLog(@"WillBeginSearch....");
}

- (void)searchDisplayControllerDidBeginSearch:(UISearchDisplayController *)controller {
    NSLog(@"DidBeginSearch....");
}

- (void)searchDisplayControllerWillEndSearch:(UISearchDisplayController *)controller {
    NSLog(@"WillEndSearch....");
}

- (void)searchDisplayControllerDidEndSearch:(UISearchDisplayController *)controller {
    NSLog(@"DidEndSearch....");
}

- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString {
    [self searchWithString];
    return NO;
}

- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchScope:(NSInteger)searchOption {
    [self searchWithString];
    return NO;
}

#pragma mark - Table view data source
//因为这个控制器既是原来的WBDiscoverTableViewController。又是UISearchDisplayController的searchContentsController。
//WBDiscoverTableViewController的tableView和searchResultsTableView的delegat都指向这个对象（self）。
//所以须要在回调中差别究竟是哪个tableView

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    if (tableView == self.tableView) {
        return 2;
    } else if (tableView == self.searchDisplayController.searchResultsTableView){
        return 1;
    } else
        return 0;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    if (tableView == self.tableView) {
        return 2;
       
    } else if (tableView == self.searchDisplayController.searchResultsTableView) {
        return self.results.count;

    } else
        return 0;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    if (tableView == self.tableView) {
       
        if (indexPath.section == 0 && indexPath.row == 0) {
            return self.hotTopicsCell1;
        } else if (indexPath.section == 0 && indexPath.row == 1) {
            return self.hotTopicsCell2;
        } else if (indexPath.section == 1 && indexPath.row == 0) {
            return self.nearbyPeopleCell;
        } else {
            return self.nearbyWeiboCell;
        }
       
    } else if (tableView == self.searchDisplayController.searchResultsTableView) {

        UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"resultCell"];
        id result = self.results[indexPath.row];
        if ([result isMemberOfClass:[WBSearchSuggestionsOfUsers class]]) {
            WBSearchSuggestionsOfUsers * suggestion = result;
            cell.textLabel.text = suggestion.nickName;
            cell.detailTextLabel.text = suggestion.followersCount;
        } else if ([result isMemberOfClass:[WBSearchSuggestionsOfSchools class]]) {
            WBSearchSuggestionsOfSchools *suggestion = result;
            cell.textLabel.text = suggestion.schoolName;
            cell.detailTextLabel.text = suggestion.location;
        } else {
            WBSearchSuggestionsOfCompanies *suggestion = result;
            cell.textLabel.text = suggestion.suggestion;
        }
        return cell;
    } else
        return nil;
}

- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section {
        return 10;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
//    UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
    UIViewController *vc = [[UIViewController alloc]init];
    vc.view.backgroundColor = [UIColor whiteColor];
    [self.navigationController pushViewController:vc animated:YES];
   

    }

@end

     当我在UISearchBar中输入keyword进行搜索。假设返回结果的数量（self.results.count）大于2的时候，程序就会崩溃，错误原因：reason: '*** -[__NSArrayI objectAtIndex:]: index 2 beyond bounds [0 .. 1]’。

     看起来是数组訪问越界了，也就是说数组中仅仅有两个对象，可是却訪问了index为2的对象。于是程序就崩溃了。

检查了代码，并没有什么异常，最后想到是不是静态TableView导致的问题呢？

     于是决定将TableView改动为动态的，并改动WBDiscoverTableViewController.m中的代码：

#import "WBDiscoverTableViewController.h"

@interface WBDiscoverTableViewController ()
@property (weak, nonatomic) IBOutlet UISearchBar *mySearchbar;
@property (nonatomic, strong) NSArray *results;
@end

@implementation WBDiscoverTableViewController

- (void)viewDidLoad {
    [super viewDidLoad];

     

    [self.searchDisplayController.searchResultsTableView registerNib:[UINib nibWithNibName:@"WBsearchSuggestionCell" bundle:[NSBundle mainBundle]] forCellReuseIdentifier:@"WBsearchSuggestionCell"];
   
    [self.tableView registerNib:[UINib nibWithNibName:@"hotTopicsCell1" bundle:[NSBundle mainBundle]] forCellReuseIdentifier:@"hotTopicsCell1"];
   
    [self.tableView registerNib:[UINib nibWithNibName:@"hotTopicsCell2" bundle:[NSBundle mainBundle]] forCellReuseIdentifier:@"hotTopicsCell2"];
   
    [self.tableView registerNib:[UINib nibWithNibName:@"nearbyPeopleCell" bundle:[NSBundle mainBundle]] forCellReuseIdentifier:@"nearbyPeopleCell"];
   
    [self.tableView registerNib:[UINib nibWithNibName:@"nearbyWeiboCell" bundle:[NSBundle mainBundle]] forCellReuseIdentifier:@"nearbyWeiboCell"];
   
}

- (void)searchWithString {
    switch (self.mySearchbar.selectedScopeButtonIndex) {
        case 0:
            //搜用户
            if ([[NSUserDefaults standardUserDefaults] objectForKey:@"accessToken"]) {
                [[WBWeiboAPI shareWeiboApi] searchSuggestionsUsersWithString:self.mySearchbar.text AndCount:20 CompletionCallBack:^(id obj) {
                    self.results = obj;
                    dispatch_async(dispatch_get_main_queue(), ^{
                        NSLog(@"self.results.count :%ld", self.results.count);
                        [self.searchDisplayController.searchResultsTableView reloadData];
                    });
                   
                }];
            }
            break;
        case 1:
            //搜学校
            if ([[NSUserDefaults standardUserDefaults] objectForKey:@"accessToken"]) {
                [[WBWeiboAPI shareWeiboApi] searchSuggestionsSchoolsWithString:self.mySearchbar.text AndCount:20 AndType:0 CompletionCallBack:^(id obj) {
                    self.results = obj;
                    dispatch_async(dispatch_get_main_queue(), ^{
                        NSLog(@"self.results.count :%ld", self.results.count);
                        [self.searchDisplayController.searchResultsTableView reloadData];
                    });
                }];
            }
            break;
        case 2:
            //搜公司
            if ([[NSUserDefaults standardUserDefaults] objectForKey:@"accessToken"]) {
                [[WBWeiboAPI shareWeiboApi] searchSuggestionsCompaniesWithString:self.mySearchbar.text AndCount:20 CompletionCallBack:^(id obj) {
                    self.results = obj;
                    dispatch_async(dispatch_get_main_queue(), ^{
                        NSLog(@"self.results.count :%ld", self.results.count);
                        [self.searchDisplayController.searchResultsTableView reloadData];
                    });
                }];
            }
            break;
        default:
            break;
    }
}

#pragma mark UISearchBarDelegate

- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar {
    [self searchWithString];
   
}


#pragma mark UISearchDisplayDelegate

- (void)searchDisplayControllerWillBeginSearch:(UISearchDisplayController *)controller {
    NSLog(@"WillBeginSearch....");
}

- (void)searchDisplayControllerDidBeginSearch:(UISearchDisplayController *)controller {
    NSLog(@"DidBeginSearch....");
}

- (void)searchDisplayControllerWillEndSearch:(UISearchDisplayController *)controller {
    NSLog(@"WillEndSearch....");
}

- (void)searchDisplayControllerDidEndSearch:(UISearchDisplayController *)controller {
    NSLog(@"DidEndSearch....");
}

- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString {
    [self searchWithString];
    return NO;
}

- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchScope:(NSInteger)searchOption {
    [self searchWithString];
    return NO;

}

#pragma mark - Table view data source
//因为这个控制器既是原来的WBDiscoverTableViewController，又是UISearchDisplayController的searchContentsController。

//WBDiscoverTableViewController的tableView和searchResultsTableView的delegat都指向这个对象（self）。
//所以须要在回调中差别究竟是哪个tableView

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    if (tableView == self.tableView) {
        return 2;
    } else if (tableView == self.searchDisplayController.searchResultsTableView){
        return 1;
    } else
        return 0;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    if (tableView == self.tableView) {
        return 2;
       
    } else if (tableView == self.searchDisplayController.searchResultsTableView) {
        return self.results.count;

    } else
        return 0;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    if (tableView == self.tableView) {
   
        if (indexPath.section == 0 && indexPath.row == 0) {
            UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"hotTopicsCell1" forIndexPath:indexPath];
            return cell;
        } else if (indexPath.section == 0 && indexPath.row == 1) {
            UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"hotTopicsCell2" forIndexPath:indexPath];
            return cell;
        } else if (indexPath.section == 1 && indexPath.row == 0) {
            UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"nearbyPeopleCell" forIndexPath:indexPath];
            return cell;
        } else {
            UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"nearbyWeiboCell" forIndexPath:indexPath];
            return cell;
        }
       
    } else if (tableView == self.searchDisplayController.searchResultsTableView) {

        WBsearchSuggestionCell *cell = [tableView dequeueReusableCellWithIdentifier:@"WBsearchSuggestionCell" forIndexPath:indexPath];
        id result = self.results[indexPath.row];
       
        if ([result isMemberOfClass:[WBSearchSuggestionsOfUsers class]]) {
            WBSearchSuggestionsOfUsers * suggestion = result;
            cell.suggestion.text = suggestion.nickName;
        } else if ([result isMemberOfClass:[WBSearchSuggestionsOfSchools class]]) {
            WBSearchSuggestionsOfSchools *suggestion = result;
            cell.suggestion.text = suggestion.schoolName;
           
        } else {
            WBSearchSuggestionsOfCompanies *suggestion = result;
            cell.suggestion.text = suggestion.suggestion;
        }
        return cell;
    } else
        return nil;
}


- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section {
        return 10;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    [tableView deselectRowAtIndexPath:indexPath animated:YES];

    UIViewController *vc = [[UIViewController alloc]init];
    vc.view.backgroundColor = [UIColor whiteColor];
    [self.navigationController pushViewController:vc animated:YES];
   

}

@end

     測试，问题攻克了！

     可是仍然心存疑问。为什么静态TableView会影响UISearchBar and Search Display Controller中 searchResultsTableView的cell？