我有一个可以让用户查看工作的工作应用。乔布斯是我Parse后端的一个类。我想创建一个收藏夹选项卡，用户可以在其中标记某些作业。
我在我的用户类中创建了一个关系列，将其引用到我的Jobs类。
但是，当用户点击以使作业成为收藏时，我遇到了这个问题：[错误]：无法添加指向关系的非指针（代码：111，版本：1.7.5）< / p>
我觉得我的PFRelation编码很有用。我已经研究过这个错误，但似乎找不到与我的问题有关的任何主题。我必须在某处犯错，但
@interface JobDetailViewController ()
@end
@implementation JobDetailViewController
@synthesize jobPhoto;
@synthesize RotationLabel;
@synthesize QualificationsTextView;
@synthesize Job_DescriptionTextView;
@synthesize TypeLabel;
@synthesize LocationLabel;
@synthesize ClearanceLabel;
@synthesize PositionLabel;
@synthesize job;
@synthesize POC;
@synthesize Email;
@synthesize Phone;
@synthesize Apply;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
[_Scroller setScrollEnabled:YES];
[_Scroller setContentSize:CGSizeMake(320, 2200)];
[self dismissKeyboard];
self.PositionLabel.text = job.position;
self.RotationLabel.text = job.rotation;
self.LocationLabel.text = job.location;
self.TypeLabel.text = job.type;
self.ClearanceLabel.text = job.clearance;
jobPhoto.file = (PFFile *)job.imageFile;
[jobPhoto loadInBackground];
NSMutableString *pocText = [NSMutableString string];
for (NSString* poc in job.poc) {
[pocText appendFormat:@"%@\n", poc];
}
self.POC.text = pocText;
NSMutableString *emailText = [NSMutableString string];
for (NSString* email in job.email) {
[emailText appendFormat:@"%@\n", email];
}
self.Email.text = emailText;
NSMutableString *phoneText = [NSMutableString string];
for (NSString* phone in job.phone) {
[phoneText appendFormat:@"%@\n", phone];
}
self.Phone.text = phoneText;
NSMutableString *applyText = [NSMutableString string];
for (NSString* apply in job.apply) {
[applyText appendFormat:@"%@\n", apply];
}
self.Apply.text = applyText;
NSMutableString *qualificationsText = [NSMutableString string];
for (NSString* qualifications in job.qualifications) {
[qualificationsText appendFormat:@"%@\n", qualifications];
}
self.QualificationsTextView.text = qualificationsText;
NSMutableString *job_descriptionText = [NSMutableString string];
for (NSString* job_description in job.job_description) {
[job_descriptionText appendFormat:@"%@\n", job_description];
}
self.Job_DescriptionTextView.text = job_descriptionText;
}
- (IBAction)favoriteButtonAction:(id)sender {
PFObject *jobs = [PFObject objectWithClassName:@"Jobs"];
PFUser *user = [PFUser currentUser];
PFRelation *relation = [user relationForKey:@"Favorites"];
[relation addObject:jobs];
[user saveInBackground];
}
- (void)viewDidUnload
{
[self setJobPhoto:nil];
[self setPositionLabel:nil];
[self setRotationLabel:nil];
[self setLocationLabel:nil];
[self setTypeLabel:nil];
[self setQualificationsTextView:nil];
[self setJob_DescriptionTextView:nil];
[self setPOC: nil];
[self setPhone:nil];
[self setEmail:nil];
[self setApply:nil];
[self dismissKeyboard];
[super viewDidUnload];
// Release any retained subviews of the main view.
}
-(void) dismissKeyboard {
[Email resignFirstResponder];
[POC resignFirstResponder];
[Phone resignFirstResponder];
[Job_DescriptionTextView resignFirstResponder];
[QualificationsTextView resignFirstResponder];
}
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{
return NO;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
- (void) favoriteSuccess {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Success!" message:@"Added job to Favorites!" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
[alert show];
}
- (void) favoriteFailed {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Ooooops!" message:@"Error occurred while adding to Favorites!" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
[alert show];
}
@end
在JobDetailViewController之前填充作业的JobListViewController：
#import "JobDetailViewController.h"
#import "JobListViewController.h"
#import "Job.h"
#import "SearchedResultCell.h"
#import <Parse/Parse.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
{}
@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 = 20;
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
}
- (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 *query1 = [PFQuery queryWithClassName:@"Jobs"];
NSString *searchThis = [searchedBar.text capitalizedString];
[query1 whereKey:@"Position" containsString:searchThis];
PFQuery *query2 = [PFQuery queryWithClassName:@"Jobs"];
[query2 whereKey:@"Type" containsString:searchThis];
PFQuery *query = [PFQuery orQueryWithSubqueries:@[query1,query2]];
[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.
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 *bell = [self.tableView dequeueReusableCellWithIdentifier:pimpleTableIdentifier];
if (bell == nil) {
bell = [[SearchedResultCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:pimpleTableIdentifier];
}
[self configureSearchResult:bell atIndexPath:indexPath object:object];
}
// Configure the cell
PFFile *thumbnail = [object objectForKey:@"imageFile"];
PFImageView *thumbnailImageView = (PFImageView*)[cell viewWithTag:100];
thumbnailImageView.image = [UIImage imageNamed:@"AppIcon.png"];
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)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.poc = [object objectForKey:@"POC"];
job.email = [object objectForKey:@"Email"];
job.phone = [object objectForKey:@"Phone"];
job.apply = [object objectForKey:@"Apply"];
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];
}
- (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:@"AppIcon.png"];
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
答案 0 :(得分：1)
您的代码未指向现有作业对象
PFObject *jobs = [PFObject objectWithClassName:@"Jobs"];
要将对象添加到关系中，它应该是其表上的现有对象（如果是新对象，则需要先将其保存）
<强>更新
您的代码应使用视图控制器中的属性job，并将其添加到当前用户关系中，如下所示
- (IBAction)favoriteButtonAction:(id)sender {
PFUser *user = [PFUser currentUser];
PFRelation *relation = [user relationForKey:@"Favorites"];
[relation addObject:job];
[user saveInBackground];
}
如果您将Parse subclasses用于Job对象
会更好#import <Parse/Parse.h>
#import <Parse/PFObject+Subclass.h>
@interface Job : PFObject<PFSubclassing>
@property (nonatomic, strong) NSString *rotation;
@property (nonatomic, strong) NSString *location;
@property (nonatomic, strong) NSString *type;
..
.
.
.
@end
@implementation Tracker
@dynamic rotation, location, type,....;
+ (void)load {
[self registerSubclass];
}
+ (NSString *)parseClassName {
return @"Job";
}
@end
然后将代码修改为以下
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([segue.identifier isEqualToString:@"showJobDetail"]) {
NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
Job *job = [self.objects objectAtIndex:indexPath.row];
JobDetailViewController *destViewController = segue.destinationViewController;
destViewController.job = job;
}
}