在iOS10中如何使用objective c中的uisearchbar？

Question

我想在table视图控制器中添加uisearchbar，但是我在iOS9中搜索了uisearchbar教程并尝试了。我无法在我的项目模拟器上显示 uisearchbar。它也没有搜索功能。如果我传递代码“self.tableView.contentOffset = CGPointMake(0, CGRectGetHeight(self.searchController.searchBar.frame));”，Xcode 将显示错误消息。此消息是“libc++abi.dylib：终止并出现 NSException 类型的未捕获异常”。

能告诉我哪里错了吗？

平台：iPhone 在 iOS 10.3 和 iPad 在 iOS 10.3 Xcode version:8.3.3 (8E3004b)

.h 文件

#import <UIKit/UIKit.h>

@interface SearchBarTableViewController : UITableViewController <UISearchControllerDelegate, UISearchBarDelegate, UISearchResultsUpdating>
@property (nonatomic, strong) UISearchController *searchController;
@property (weak, nonatomic) IBOutlet UISearchBar *searchBar;
@property(nonatomic,strong) NSMutableArray *RowArray;

@end

.m 个文件

#pragma mark Search bar Part
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];

if (!_searchController.searchBar.superview) {
    self.tableView.tableHeaderView = self.searchController.searchBar;
}
if (!self.searchController.active && self.searchController.searchBar.text.length == 0) {
    self.tableView.contentOffset = CGPointMake(0, CGRectGetHeight(self.searchController.searchBar.frame));
}
}


- (void)viewWillDisappear:(BOOL)animated {
[super viewWillDisappear:animated];

if (self.searchController.isActive) {
    self.searchController.active = NO;
}
}

#pragma mark - Getters / Setters

- (UISearchController *)searchController {
if (!_searchController) {
    _searchController = [[UISearchController alloc]initWithSearchResultsController:nil];
    _searchController.searchResultsUpdater = self;
    _searchController.dimsBackgroundDuringPresentation = NO;
    _searchController.searchBar.delegate = self;
    [_searchController.searchBar sizeToFit];
}
return _searchController;
}

- (NSArray *)searchResults {
NSString *searchString = self.searchController.searchBar.text;
if (searchString.length > 0) {
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF CONTAINS[c] %@", searchString];
    return [self.RowArray filteredArrayUsingPredicate:predicate];
}
else {
    return self.RowArray;
}

return @[];
}


#pragma mark - UITableViewDataSource

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
if (self.searchController.isActive && self.searchController.searchBar.text.length > 0) {
    return self.searchResults.count;
}
else {
    return self.RowArray.count;
}
return 0;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell;
NSString *cityName = @"";
cell = [tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath];
if (self.searchController.isActive && (![self.searchController.searchBar.text isEqualToString:@""])) {
    cityName = [self.searchResults objectAtIndex:indexPath.row];
}
else {
    cityName = [self.RowArray objectAtIndex:indexPath.row];
}
cell.textLabel.text = cityName;

return cell;
}

Interface image 1 about outlet setting.

UISearchbar outlet setting.

Search Display Controller outlet setting.

Answer 1

我找到答案了。我忽略了 updateSearchResultsForSearchController 代码。

- (void)updateSearchResultsForSearchController:(UISearchController *)searchController {
[self.tableView reloadData];
}

在iOS10中如何使用objective c中的uisearchbar？

How to use the uisearchbar in objective c in iOS 10?

objective-c

uisearchbar

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uisearchcontroller