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

时间：2015-06-10 17:24:00 阅读：238 评论：0 收藏：0 [点我收藏+]

最近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，然后添加了两个Section，每个Section两行Cell。

接下来往这个TableView中拖入了一个UISearchBar and Search Display Controller，storyboard中的结构如下图：

然后在UITableViewController对应的WBDiscoverTableViewController.m中实现相关的协议方法。代码如下：

#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
//由于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），
//所以需要在回调中区别到底是哪个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中输入关键字进行搜索，如果返回结果的数量（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]’。

看起来是数组访问越界了，也就是说数组中只有两个对象，但是却访问了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修改为动态的，并修改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
//由于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），
//所以需要在回调中区别到底是哪个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

测试，问题解决了！

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

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

标签：ios开发 objective-c 移动互联网视图控制器

原文地址：http://blog.csdn.net/debolee/article/details/46443429

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