使用解析数据实现搜索栏的问题

Question

我已经在谷歌的土地上进行了广泛的搜索，并找到了这方面的教程，但它们是在 IOS8 之前的。我已尽我所能将其拼凑在一起，但是当应用程序运行时，我在搜索栏中输入单词时，什么也没有返回，或者它崩溃了。下面是视图的外观，以及每个对象的含义：

这是我的 JobListViewController.m 文件：

#import "JobDetailViewController.h"
#import "JobListViewController.h"
#import "Job.h"
#import "SearchedResultCell.h"


@interface JobListViewController () <UISearchDisplayDelegate, UISearchBarDelegate> {

}

@property (nonatomic, weak) IBOutlet UISearchBar *searchedBar;
@property (nonatomic, strong) NSString *mainTitle;
@property (nonatomic, strong) NSString *subTitle;
@property (nonatomic, assign) BOOL canSearch;

@end

@interface JobListViewController ()

@end

@implementation JobListViewController
{
    NSArray *jobs;
    NSArray *searchResults;
}
@synthesize searchedBar;
@synthesize mainTitle;
@synthesize subTitle;
@synthesize canSearch;


- (id)initWithCoder:(NSCoder *)aCoder
{
    self = [super initWithCoder:aCoder];
    if (self) {
        // Custom the table

        // The className to query on
        self.parseClassName = @"Jobs";

        // The key of the PFObject to display in the label of the default cell style
        self.textKey = @"Position";

        // Whether the built-in pull-to-refresh is enabled
        self.pullToRefreshEnabled = YES;

        // Whether the built-in pagination is enabled
        self.paginationEnabled = YES;

        // The number of objects to show per page
        self.objectsPerPage = 10;
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];

    [self.searchedBar becomeFirstResponder];


}

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

    self.canSearch = 0;

}

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

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

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

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}

- (void)objectsWillLoad {
    [super objectsWillLoad];

    // This method is called before a PFQuery is fired to get more objects
}


- (PFQuery *)queryForTable
{
    PFQuery *query;

    if (self.canSearch == 0)
    {
        query = [PFQuery queryWithClassName:@"Jobs"];
    }
    else
    {
        query = [PFQuery queryWithClassName:@"Jobs"];

        NSString *searchThis = [searchedBar.text uppercaseString];
        [query whereKey:@"Position" containsString:searchThis];

    }


    [query orderByAscending:@"Position"];


        query.cachePolicy = kPFCachePolicyCacheThenNetwork;


    return query;
}




- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath object: (PFObject *)object
{
    static NSString *simpleTableIdentifier = @"JobCell";
        static NSString *pimpleTableIdentifier = @"JobCell";

    UITableViewCell *cell = [self.tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];

    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:simpleTableIdentifier];

    SearchedResultCell *cell = [self.tableView dequeueReusableCellWithIdentifier:pimpleTableIdentifier];

    if (cell == nil) {
        cell = [[SearchedResultCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:pimpleTableIdentifier];

        }

        [self configureSearchResult:cell atIndexPath:indexPath object:object];


    }

    // Configure the cell
    PFFile *thumbnail = [object objectForKey:@"imageFile"];
    PFImageView *thumbnailImageView = (PFImageView*)[cell viewWithTag:100];
    thumbnailImageView.image = [UIImage imageNamed:@"placeholder.jpg"];
    thumbnailImageView.file = thumbnail;
    [thumbnailImageView loadInBackground];

    UILabel *positionLabel = (UILabel*) [cell viewWithTag:101];
    positionLabel.text = [object objectForKey:@"Position"];
    UILabel *rotationLabel = (UILabel*) [cell viewWithTag:102];
    rotationLabel.text = [object objectForKey:@"Rotation"];
    UILabel *locationLabel = (UILabel*) [cell viewWithTag:103];
    locationLabel.text = [object objectForKey:@"Location"];
    UILabel *typeLabel = (UILabel*) [cell viewWithTag:104];
    typeLabel.text = [object objectForKey:@"Type"];


return cell;
}

- (void) objectsDidLoad:(NSError *)error
{
    [super objectsDidLoad:error];

    NSLog(@"error: %@", [error localizedDescription]);
}


- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    if ([segue.identifier isEqualToString:@"showJobDetail"]) {
        NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];

        Job *job = [[Job alloc] init];

        JobDetailViewController *destViewController = segue.destinationViewController;

        PFObject *object = [self.objects objectAtIndex:indexPath.row];
        job.position = [object objectForKey:@"Position"];
        job.name = [object objectForKey:@"Name"];
        job.email = [object objectForKey:@"Email"];
        job.phone = [object objectForKey:@"Phone"];
        job.imageFile = [object objectForKey:@"imageFile"];
        job.rotation = [object objectForKey:@"Rotation"];
        job.location = [object objectForKey:@"Location"];
          job.type = [object objectForKey:@"Type"];
        job.clearance = [object objectForKey:@"Clearance"];
        job.job_description = [object objectForKey:@"Job_Description"];
        job.qualifications = [object objectForKey:@"Qualifications"];
        destViewController.job = job;

    }

}

- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar
{

    [self clear];

    self.canSearch = 1;

    [self.searchedBar resignFirstResponder];

    [self queryForTable];
    [self loadObjects];

}
/*
 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
 {
 if (searchResults == nil) {
 return 0;
 } else if ([searchResults count] == 0) {
 return 1;
 } else {
 return [self.objects count];
 }
 }
 */
- (void)configureSearchResult:(SearchedResultCell *)cell atIndexPath:(NSIndexPath *)indexPath object:(PFObject *)object
{
    mainTitle = [object objectForKey:@"Position"];
    cell.mainTitle.text = mainTitle;

    subTitle = [object objectForKey:@"Type"];
    cell.detail.text = subTitle;

     // Implement this if you want to Show image
     cell.showImage.image = [UIImage imageNamed:@"placeholder.jpg"];

     PFFile *imageFile = [object objectForKey:@"imageFile"];

     if (imageFile) {
     cell.showImage.file = imageFile;
     [cell.showImage loadInBackground];
     }
}


#pragma mark - UITableViewDelegate

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{

    [tableView deselectRowAtIndexPath:indexPath animated:YES];

    [searchedBar resignFirstResponder];

    if ([self.objects count] == indexPath.row) {
        [self loadNextPage];
    } else {
        PFObject *photo = [self.objects objectAtIndex:indexPath.row];
        NSLog(@"%@", photo);

        // Do something you want after selected the cell
    }
}

#pragma mark - UIScrollViewDelegate


- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
    [self.searchedBar resignFirstResponder];
}

- (void)searchBarCancelButtonClicked:(UISearchBar *) searchBar {
    [self.searchedBar resignFirstResponder];
    [self queryForTable];
    [self loadObjects];

}




@end

我找不到哪里出错了。任何帮助将不胜感激。或者如果你能指出我正确的方向的话。

Answer 1

几个月前我遇到了问题，所以下面是一个对我很有帮助的项目。也希望你。

https://github.com/mwazir2/ParseSearchNoPagination

干杯！

更新

在我对上面这个例子的改编中，我遵循了项目中的所有内容。该项目使用 Parse SDK 中的 PFQueryTableViewController，而不是默认的 iOS TableViewController。

在第一部分 -(id)initWithCoder 我已经评论了

//self.textKey = @"username";

然后我在某些方面更改了 - (PFQuery *)queryForTable 方法。一个只是更改了 whereKey 以适应我的项目，第二个更改了查询，因为它应该只显示在与特定用户相关的表对象中。以下是各自的查询。

第一个更一般的查询

- (PFQuery *)queryForTable
{
PFQuery *query = [PFUser query];
if (self.canSearch == 0) {
    query = [PFQuery queryWithClassName:@"_User"];
} else {


    query = [PFQuery queryWithClassName:@"_User"];

    NSString *searchThis = [searchedBar.text capitalizedString];

    //PFQuery *query = [PFQuery queryWithClassName:@"Channel"];
    //[query whereKey:@"channelName" equalTo:searchThis];
    [query whereKey:@"username" containsString:searchThis];

}

第二个，特定于当前用户：

- (PFQuery *)queryForTable
{
PFQuery *query = [PFQuery queryWithClassName:self.parseClassName];
[query whereKey:@"owner" equalTo:[PFUser currentUser]];

[query orderByDescending:@"createdAt"];

if (self.pullToRefreshEnabled) {
    query.cachePolicy = kPFCachePolicyNetworkOnly;
}

// If no objects are loaded in memory, we look to the cache first to fill the table
// and then subsequently do a query against the network.
if (self.objects.count == 0) {
    query.cachePolicy = kPFCachePolicyCacheThenNetwork;
}

return query;
}

对于我只使用的 tableView 方法：tableView cellForRowAtIndexPath（很像你的）。还有 LoadMoreCell 的 cellForRowAtIndexPath，如示例中所示。

还有 tableView heightForRowAtIndexPath: 用于 LoadMoreCell 和 tableView didSelectRowAtIndexPath，如下所示：

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

//[searchedBar resignFirstResponder];

if ([self.objects count] == indexPath.row) {
    [self loadNextPage];
} else {
    PFObject *photo = [self.objects objectAtIndex:indexPath.row];
    NSLog(@"%@", photo);

    // Do something you want after selected the cell
}
}

当然，在 } else { 语句下面你可以更改它或删除 NSLog 行。

我建议您尝试使用您的对象和键来更改示例本身，直到它起作用，然后更改您的，就像示例一样...:)

复合查询

PFQuery *query1 = [PFQuery queryWithClassName:@"Class1"];
[name whereKey:@"column1" equalTo:[fieldInCode text]];
PFQuery *query2 = [PFQuery queryWithClassName:@"Class1"];
[enterKey whereKey:@"column2" equalTo:[anotherField text]];
PFQuery *query = [PFQuery orQueryWithSubqueries:@[query1,query2]];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError   *error) {

干杯！