我正在使用核心数据模型和 UITableViewController 表视图。我的模型似乎运行良好，但是当我向模型中添加实体时，我的表格视图没有更新。我相信我的模型正在工作的原因是，当我添加一个实体时，在运行时视图中什么都没有显示，但是如果我切断任务然后重新启动它，我之前创建的实体突然出现在表视图中。
这是我的表视图控制器 - AudioTableViewController.h
#import <UIKit/UIKit.h>
#import "Bank.h"
#import "Player.h"
@class Player;
@interface AudioTableViewController : UITableViewController <UITableViewDelegate, UITableViewDataSource> {
Player *myMainMan;
}
-(void)addAudioEntityToArray:(AudioFile *)event;
-(NSMutableArray *)recordingsArray;
@end
AudioTableViewController.m（实现文件）
#import "AudioTableViewController.h"
@implementation AudioTableViewController
-(void)addAudioEntityToArray:(AudioFile *)event {
NSIndexPath *indexPath;
if(event.type) {
[[MusikerViewController recordingsArray] addObject:event];//self?
indexPath = [NSIndexPath indexPathForRow:0 inSection:0];
}else {
[[MusikerViewController downloadsArray] addObject:event];
indexPath = [NSIndexPath indexPathForRow:0 inSection:1];
}
[[self tableView] setEditing:YES animated:NO];
[self.tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:indexPath]
withRowAnimation:UITableViewRowAnimationNone];
}
- (void)viewDidLoad {
[[self tableView] reloadData];
[super viewDidLoad];
self.title = @"Audio Files";//put this in application delegate
self.navigationItem.leftBarButtonItem = self.editButtonItem;
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Return the number of sections.
return 2;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
NSLog(@"Place I");
if(section == 0) {
return [[MusikerViewController recordingsArray] count];
} else if (section == 1) {
return [[MusikerViewController downloadsArray] count];
}
}
... 更多方法
这是我的 Bank 课程的一部分，可能与 Bank.h 相关
#import <Foundation/Foundation.h>
#import <AudioToolbox/AudioToolbox.h>
#import "AudioFile.h"
#import "AudioTableViewController.h"
#import "MusikerAppDelegate.h"
@interface Bank : NSObject <UIAlertViewDelegate> {
NSManagedObjectContext *managedObjectContext;
AudioFile *sound;
}
@property (retain, nonatomic) NSManagedObjectContext *managedObjectContext;
+(NSString *)getDataPath:(NSString *)fileExtDate;
-(AudioFile *)addAudioFileEntityToModelWithDate:(NSDate *)theD andURLString:(NSString *)str;
-(BOOL)removeAudioFromModel:(id)audio;
-(NSMutableArray *)getFetchArray;
@end
银行.m
#import "Bank.h"
@implementation Bank
@synthesize managedObjectContext;
- (AudioFile *)addAudioFileEntityToModelWithDate:(NSDate *)theD andURLString:(NSString *)str {
sound = (AudioFile *)[NSEntityDescription insertNewObjectForEntityForName:@"AudioFile" inManagedObjectContext:managedObjectContext];
sound.creationDate = theD;
sound.soundPath = str; //set the sound path to the sound file's url
[self alertForTitle];
return sound;
}
- (BOOL)saveContext {
NSError *error = nil;
if(!managedObjectContext) {
NSLog(@"managedObejctContext problem at saveContext Bank");
}
if (![managedObjectContext save:&error]) {
return NO;
} else {
return YES;
}
}
- (NSMutableArray *)getFetchArray {
NSLog(@"ManagedObjectContext at getFetchArray");
NSLog(@"Context: %@",managedObjectContext);
NSFetchRequest *request = [[NSFetchRequest alloc] init];
if(!managedObjectContext) {
NSLog(@"There is no managedObjectContext in getFetchArray Bank");
}
NSEntityDescription *entity = [NSEntityDescription entityForName:@"AudioFile" inManagedObjectContext:managedObjectContext];
[request setEntity:entity];
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"creationDate" ascending:NO];
NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor, nil];
[request setSortDescriptors:sortDescriptors];
[sortDescriptors release];
[sortDescriptor release];
NSError *error = nil;
NSMutableArray *mutableFetchResults = [[managedObjectContext executeFetchRequest:request error:&error] mutableCopy];
if (mutableFetchResults == nil) {
NSLog(@"mutableFetchResults array is nil");
}
[request release];
return mutableFetchResults;
}
+ (NSString *)getDataPath:(NSString *)fileExtDate {
NSLog(@"getDataPath called");
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
documentsDirectory = [documentsDirectory stringByAppendingPathComponent:@"Musik Directory"]; //changing the recording directory to Musik Directory
NSError *error;
if (![[NSFileManager defaultManager] fileExistsAtPath:documentsDirectory]) {
[[NSFileManager defaultManager] createDirectoryAtPath:documentsDirectory withIntermediateDirectories:YES attributes:nil error:&error];
NSLog(@"In the if statement");
}
NSString *docPath = [documentsDirectory stringByAppendingPathComponent:fileExtDate];
return docPath;
}
播放器.h
#import <Foundation/Foundation.h>
#import <AVFoundation/AVFoundation.h>
#import "Bank.h"
@class Bank;
@interface Player : NSObject <AVAudioPlayerDelegate, AVAudioRecorderDelegate> {
Bank *daBank;
AVAudioPlayer *musicPlayer;
AVAudioRecorder *musicRecorder;
NSDate *myDate;
NSString *strPath;
NSString *documentPath_;
NSMutableArray *arrayListOfRecordSound;
}
-(void)playSoundFile:(NSString *)soundFilePath;
-(BOOL)saveRecordingWithDate:(NSDate *)theD andURLString:(NSString *)str;
-(void)recordSomething;
-(void)playRecording;
-(void)play;
+ (NSString *)dateString:(NSDate *)date;
+ (NSString *)dateString;
@end
播放器.m
- (Bank *)daBank
{
if(!daBank) {
daBank = [[Bank alloc] init];
}
return daBank;
}
-(BOOL)saveRecording { //this is the method that adds the new object to both the //model and view, the method that calls this method is not shown
Bank *B = [MusikerViewController daBank];
AudioTableViewController *ATVC2 = [MusikerViewController ATVControl];
AudioFile *myAudioFileMusicX314 = [[B addAudioFileEntityToModelWithDate:myDate andURLString:strPath] retain];
myAudioFileMusicX314.type = true;
[ATVC2 addAudioEntityToArray:myAudioFileMusicX314];
if(![B saveContext]) {
NSLog(@"addAudioFileEntityToModel is returning a nil managedObjectContext");
return NO;
}
[myDate release];
[strPath release];
[myAudioFileMusicX314 release];
[ATVC2 release];
return YES;
}
最后但同样重要的是，MusikViewController.h
#import <UIKit/UIKit.h>
#import "Player.h"
#import "Bank.h"
#import <QuartzCore/QuartzCore.h>
#import "MyButtonView.h"
#import "AudioTableViewController.h"
@class AudioTableViewController;
@class Bank;
@class Player;
@interface MusikerViewController : UIViewController {
] BOOL *pressed;
}
Player *myMainMan;
Bank *daBank;
AudioTableViewController *ATVControl;
NSMutableArray *recordingsArray;
NSMutableArray *downloadsArray;
+ (Bank *)daBank;
+ (Player *)myMainMan;
+ (AudioTableViewController *)ATVControl;
+ (NSMutableArray *)recordingsArray;
+ (NSMutableArray *)downloadsArray;
@end
MusikViewController.m
+ (NSMutableArray *)recordingsArray {
NSLog(@"recordingsArray called");
if(!recordingsArray) {
recordingsArray = [[NSMutableArray alloc] init];
NSMutableArray *bigTempArray = [[[[Bank alloc] init] autorelease] getFetchArray]; //change this
for(AudioFile *af in bigTempArray)
if(af.type) {
[recordingsArray addObject:af];
}
NSLog(@"recordingsArray exists");
}
return recordingsArray;
}
+ (NSMutableArray *)downloadsArray {
NSLog(@"recordingsArray called");
if(!downloadsArray) {
downloadsArray = [[NSMutableArray alloc] init];
// if(!bigTempArray)
NSMutableArray *bigTempArray = [[[[Bank alloc] init] autorelease] getFetchArray];
for(AudioFile *af in bigTempArray)
if(!af.type) {
[downloadsArray addObject:af];
}
}
return downloadsArray;
}
如果还有其他可能相关的方法，请告诉我，我会很乐意发布它们。
我还应该提到，我可以在启动应用程序后将单个实体添加到数组中，但之后会出现同样的问题。