我在项目中工作,其中TableViewController是初始控制器。然后我有CoreData存储我的数据。从我的第一个TableViewController我通过storyboard中的push segue到达ViewController。在那个ViewController中,我将数据添加到我的Core数据中,但是当ViewController关闭并且TableViewController返回时,我的表仍然是空的。
这是我的表格代码:
- (void)viewDidLoad
{
[super viewDidLoad];
AppDelegate *appDelegate = [[UIApplication sharedApplication]delegate];
_managedObjectContext = [appDelegate managedObjectContext];
NSFetchRequest*request = [[NSFetchRequest alloc]init];
NSEntityDescription*name = [NSEntityDescription entityForName:@"nameEntity" inManagedObjectContext:_managedObjectContext];
[request setEntity:name];
NSError*error = nil;
NSMutableArray*mutableFetchResults = [[_managedObjectContext executeFetchRequest:request error:&error]mutableCopy];
if (mutableFetchResults == nil) {
}
[self setMutableArray:mutableFetchResults];
[self.tableView reloadData];
}
比我的表行代码:
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return mutableArray.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"Name";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
Name*name = (Name*) [mutableArray objectAtIndex:indexPath.row ];
cell.textLabel.text = name.shop;
cell.detailTextLabel.text = name.date;
return cell;
}
这里的代码我在ViewController中存储了这些数据:
- (IBAction)addData:(id)sender;{
Name *name = [NSEntityDescription insertNewObjectForEntityForName:@"nameEntity" inManagedObjectContext:_managedObjectContext];
[name setShop:textField.text];
NSDate*date = [NSDate date];
NSDateFormatter *df = [[NSDateFormatter alloc] init];
[df setDateFormat:@"dd.MM.yyyy"];
NSString *dateString = [df stringFromDate:date];
[zoznam setDate:dateString];
答案 0 :(得分:0)
您正在致电
[self.tableView reloadData];
在您的viewDidLoad中的,当您关闭viewController时不会调用它。如果您想重新加载dataSource,请尝试以下方法:
- (void)viewWillAppear:(BOOL)animated{
AppDelegate *appDelegate = [[UIApplication sharedApplication]delegate];
_managedObjectContext = [appDelegate managedObjectContext];
NSFetchRequest*request = [[NSFetchRequest alloc]init];
NSEntityDescription*name = [NSEntityDescription entityForName:@"nameEntity" inManagedObjectContext:_managedObjectContext];
[request setEntity:name];
NSError*error = nil;
NSMutableArray*mutableFetchResults = [[_managedObjectContext executeFetchRequest:request error:&error]mutableCopy];
[self setMutableArray:mutableFetchResults];
[self.tableView reloadData];
}