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：

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

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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：

    [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"];



}

#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？

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

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