学习官方文档（photoLocations）

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-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{    NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];    APLEvent *event = (self.eventsArray)[indexPath.row];    APLEventDetailViewController *inspector = (APLEventDetailViewController *)[segue destinationViewController];    inspector.event = event;}

这里用了storyboard的destionViewcontroller（segue），可以将storyboard中连线的下一个目标viewcontroller在代码中添加跳转信息。这里为每行的跳转even都分开定义好，因此可以做到在storyboard中一个跳转页面但能实现创建多个。

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath{    if (editingStyle == UITableViewCellEditingStyleDelete) {        // Delete the managed object at the given index path.NSManagedObject *eventToDelete = (self.eventsArray)[indexPath.row];[self.managedObjectContext deleteObject:eventToDelete];// Update the array and table view.        [self.eventsArray removeObjectAtIndex:indexPath.row];        [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:YES];// Commit the change.NSError *error = nil;if (![self.managedObjectContext save:&error]) {            // Replace this implementation with code to handle the error appropriately.            // abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.            NSLog(@"Unresolved error %@, %@", error, [error userInfo]);            abort();}    }   }

这是删除选中row的代码，分为在tableview中删除，和在数据中删除;

这里的@[indexPath] 把后者转换成（NSArray *）类型；

刚开始不是很明白，问了才知道，原来这是数组的初始化。是ios6之后引入的方式。mark下。

@[] 初始化不可变数组

@{} 初始化不可变字典

- (void)viewDidLoad{    [super viewDidLoad];    self.navigationItem.leftBarButtonItem = self.editButtonItem;// Start the location manager.[[self locationManager] startUpdatingLocation];/* Fetch existing events. Create a fetch request, add a sort descriptor, then execute the fetch. */NSFetchRequest *request = [[NSFetchRequest alloc] init];NSEntityDescription *entity = [NSEntityDescription entityForName:@"Event" inManagedObjectContext:self.managedObjectContext];[request setEntity:entity];// Order the events by creation date, most recent first.NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"creationDate" ascending:NO];[request setSortDescriptors:@[sortDescriptor]];// Execute the fetch -- create a mutable copy of the result.NSError *error = nil;NSMutableArray *mutableFetchResults = [[self.managedObjectContext executeFetchRequest:request error:&error] mutableCopy];if (mutableFetchResults == nil) {// Handle the error.}// Set self's events array to the mutable array, then clean up.[self setEventsArray:mutableFetchResults];}

具体的codedata实现~

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