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私が直面している問題を最も詳細に説明したいと思います。 以前はUIViewControllerの代わりに、私は直接UITableViewControllerを持っていましたが、問題は今、私は新しいビューを作成したので、テーブルビューだけのビューでより多くのコンテンツを表示する必要があるということです。今私は持っているUIViewControllerがあります：UIScrollView。それが可能なのは：1. UIView + 1 UITableViewCoreData + UIViewController + UITableView
私はAutoLayoutを使用しています。そしてうまくいきます。私が直面している問題は、私はこのビューを使用するように切り替えるので、私はcoredataでテーブルのコンテンツを表示することができないということです。私はそれを行うことはできませんでしたが、それではできませんでした。 interfacebuilderでは、このUIViewControllerにデータソースとデリゲートを設定しました。
ヘッダー：
#import <UIKit/UIKit.h>
@interface ResultsExtraVC : UIViewController <UITableViewDelegate, UITableViewDataSource>
@property(nonatomic, strong) AGTCoreDataStack *model;
@property (strong, nonatomic) IBOutlet UILabel *labelRaceTime;
@property (strong, nonatomic) IBOutlet UILabel *labelTrackCondition;
@property (strong, nonatomic) IBOutlet UILabel *labelRaceStarttime;
@property (strong, nonatomic) IBOutlet UILabel *labelRaceMode;
@property (strong, nonatomic) IBOutlet UIScrollView *scrollView;
@property (weak, nonatomic) IBOutlet UITableView *tableView;
@property (strong, nonatomic) IBOutlet UIView *raceInfoView;
@property(nonatomic, strong)NSNumber *eventID;
@property(nonatomic, strong)NSNumber *sectionID;
@property(nonatomic, strong)NSNumber *elementID;
@property(nonatomic, strong)NSNumber *categoryID;
@end
実装：これは私がやっている最初の時間ですと、私はいくつかのチュートリアルに従うことをしようとした 
：
#import "ResultsExtraVC.h"
#import "ResultsExtraCellVC.h"
#import "Result.h"
#import "Element.h"
#import "Section.h"
#import <CoreData/CoreData.h>
@interface ResultsExtraVC() <NSFetchedResultsControllerDelegate>
//Core data
@property (nonatomic,strong) NSManagedObjectContext* managedObjectContext;
@property (nonatomic, retain) NSFetchedResultsController *fetchedResultsController;
@end
static NSString * const cellIdentifier = @"resultsExrtaAltCell";
@implementation ResultsExtraVC
@synthesize managedObjectContext;
@synthesize fetchedResultsController = _fetchedResultsController;
@synthesize eventID, sectionID, elementID, categoryID, model;
- (void)viewDidLoad {
[super viewDidLoad];
managedObjectContext = self.model.context;
[self getResults];
NSLog(@"ElementName: %@", [self getElementName]);
NSLog(@"SectionName: %@", [self getSectionName]);
[self configureHeatInfo];
// Do any additional setup after loading the view.
}
- (void)viewDidUnload
{
[super viewDidUnload];
self.fetchedResultsController = nil;
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - View Configuration
-(void) configureHeatInfo{
_scrollView.backgroundColor = [UIColor cyanColor];
_scrollView.translatesAutoresizingMaskIntoConstraints = NO;
_labelRaceTime.translatesAutoresizingMaskIntoConstraints = NO;
_labelRaceTime.text = @"Race time:\n10:00";
_labelRaceMode.translatesAutoresizingMaskIntoConstraints = NO;
_labelRaceMode.text = @"Mode: Groupstart";
_labelTrackCondition.translatesAutoresizingMaskIntoConstraints = NO;
_labelTrackCondition.text = @"Track Condition: Dry";
_labelRaceStarttime.translatesAutoresizingMaskIntoConstraints = NO;
_labelRaceStarttime.text = @"Starttime: 12.03.2016 11:09:10";
//self.tableView.translatesAutoresizingMaskIntoConstraints = NO;
/*self.tableView.dataSource = self;
self.tableView.delegate = self;*/
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return [[self.fetchedResultsController sections] count];
}
/*- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return 20;
}*/
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
id sectionInfo = [[_fetchedResultsController sections] objectAtIndex:section];
#ifndef NDEBUG
NSLog(@"%s (line:%d) - Rows: %lu",__PRETTY_FUNCTION__,__LINE__, (unsigned long)[sectionInfo numberOfObjects]);
#endif
// Return the number of rows in the section.
return [sectionInfo numberOfObjects];
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
return [self basicCellAtIndexPath:indexPath];
}
- (ResultsExtraCellVC *)basicCellAtIndexPath:(NSIndexPath *)indexPath {
ResultsExtraCellVC *cell = [self.tableView dequeueReusableCellWithIdentifier:cellIdentifier];
// Using a cell identifier will allow your app to reuse cells as they come and go from the screen.
if (cell == nil) {
#ifndef NDEBUG
NSLog(@"%s (line:%d)",__PRETTY_FUNCTION__,__LINE__);
#endif
NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"ResultsExtraCell" owner:self options:nil];
cell = (ResultsExtraCellVC *)[nib objectAtIndex:0];
}
[self configureCell:cell atIndexPath:indexPath];
return cell;
}
- (void)configureCell:(ResultsExtraCellVC *)cell atIndexPath:(NSIndexPath *)indexPath {
#ifndef NDEBUG
NSLog(@"%s (line:%d)",__PRETTY_FUNCTION__,__LINE__);
#endif
Result *result = [_fetchedResultsController objectAtIndexPath:indexPath];
[cell.cellRankNr setText:[NSString stringWithFormat:@"%@",[result endposition]]];
[cell.cellName setText:[NSString stringWithFormat:@"%@ %@ (%@)",[result pilotprename], [result pilotname], [result carnumber]]];
[cell.cellResult setText:[NSString stringWithFormat:@"%@",NSLocalizedFormatString(@"LapsXnTimeX",[result rlaps],[result rendtime])]];
[cell.cellRace setText:[NSString stringWithFormat:@"%@",NSLocalizedFormatString(@"BestTimeXnAvgTimeX",[result rbesttime], [result rmediumtime])]];
}
-(void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
{
if ([tableView respondsToSelector:@selector(setSeparatorInset:)])
{
[tableView setSeparatorInset:UIEdgeInsetsZero];
}
if ([tableView respondsToSelector:@selector(setLayoutMargins:)])
{
[tableView setLayoutMargins:UIEdgeInsetsZero];
}
if ([cell respondsToSelector:@selector(setLayoutMargins:)])
{
[cell setLayoutMargins:UIEdgeInsetsZero];
}
}
-(NSString *)getElementName{
NSString *elementName = @"";
NSEntityDescription *entityDescription = [NSEntityDescription entityForName:@"Elements" inManagedObjectContext:managedObjectContext];
NSFetchRequest *request = [[NSFetchRequest alloc] init] ;
[request setEntity:entityDescription];
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"(eventid = %@ AND sectionid = %@ AND elementid = %@ AND categoryid= %@)",eventID, sectionID, elementID, categoryID];
[request setPredicate:predicate]; //added this line later
NSArray *array = [managedObjectContext executeFetchRequest:request error:nil];
if([array count]> 0){
Element *element = [array lastObject];
elementName = [element name];
}
return elementName;
}
-(NSString *)getSectionName{
NSString *sectiontName = @"";
NSEntityDescription *entityDescription = [NSEntityDescription entityForName:@"Sections" inManagedObjectContext:managedObjectContext];
NSFetchRequest *request = [[NSFetchRequest alloc] init] ;
[request setEntity:entityDescription];
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"(eventid = %@ AND sectionid = %@)",eventID, sectionID];
[request setPredicate:predicate]; //added this line later
NSArray *array = [managedObjectContext executeFetchRequest:request error:nil];
if([array count]> 0){
Section *section = [array lastObject];
sectiontName = [section name];
}
return sectiontName;
}
-(void)getResults{
// Initialize Fetch Request
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] initWithEntityName:@"Results"];
// Add Sort Descriptors
//[fetchRequest setSortDescriptors:@[[NSSortDescriptor sortDescriptorWithKey:@"endposition" ascending:YES]]];
//Predicate
NSPredicate *commentsPredicate = [NSPredicate predicateWithFormat:@"(eventid = %@ AND sectionid = %@ AND elementid = %@)",eventID, sectionID, elementID];
[fetchRequest setPredicate:commentsPredicate]; //added this line later
// Edit the sort key as appropriate.
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"endposition"
ascending:YES];
NSArray *sortDescriptors = @[sortDescriptor];
[fetchRequest setSortDescriptors:sortDescriptors];
// Initialize Fetched Results Controller
self.fetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:self.managedObjectContext sectionNameKeyPath:nil cacheName:nil];
// Configure Fetched Results Controller
[self.fetchedResultsController setDelegate:self];
// Perform Fetch
NSError *error = nil;
[self.fetchedResultsController performFetch:&error];
if (error) {
NSLog(@"Unable to perform fetch.");
NSLog(@"%@, %@", error, error.localizedDescription);
}
}
#pragma mark -
#pragma mark Fetched Results Controller Delegate Methods
- (void)controllerWillChangeContent:(NSFetchedResultsController *)controller {
[self.tableView beginUpdates];
}
- (void)controllerDidChangeContent:(NSFetchedResultsController *)controller {
[self.tableView endUpdates];
}
- (void)controller:(NSFetchedResultsController *)controller didChangeObject:(id)anObject atIndexPath:(NSIndexPath *)indexPath forChangeType:(NSFetchedResultsChangeType)type newIndexPath:(NSIndexPath *)newIndexPath {
switch (type) {
case NSFetchedResultsChangeInsert: {
[self.tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:newIndexPath] withRowAnimation:UITableViewRowAnimationFade];
break;
}
case NSFetchedResultsChangeDelete: {
[self.tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
break;
}
case NSFetchedResultsChangeUpdate: {
[self configureCell:(ResultsExtraCellVC *)[self.tableView cellForRowAtIndexPath:indexPath] atIndexPath:indexPath];
break;
}
case NSFetchedResultsChangeMove: {
[self.tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
[self.tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:newIndexPath] withRowAnimation:UITableViewRowAnimationFade];
break;
}
}
}
@end
マイビューはこのようになりますこれはCoreDataで、以前は常にUITableViewControllerのみを使用していました。 http://code.tutsplus.com/tutorials/core-data-from-scratch-more-nsfetchedresultscontroller--cms-21777 ともチェック：CoreData TableView inside UIViewController
しかしなしの成功と は、私がこれに続きました。 誰かが私にこの問題を手伝ってもらえるといいと思います。たぶん、コード行に予め
'numberOfSectionsInTableView'と' numberOfRowsInSection'から実際にどのような値を返していますか？ –
こんにちはPhillip、それは0を返します、なぜ行が表示されない理由です、結果エンティティはviewDidLoad：NSLog（@ "ElementName：％@"、[self getElementName]）の内容と他のクエリを持っています。 ; NSLog（@ "SectionName：％@"、[self getSectionName]）;コンテンツを返すので、モデルとコンテキストは適切に設定されます。 – Miguel