Ios 从UIViewController返回到tableViewController时出现白色框

回到tableViewController时，我意识到视图控制器旁边有一个白色框。如果我有任何框架或子视图或类似的东西，我会检查我的代码

下面是显示我的问题的gif：

下面是我的MasterViewController.h和.m（即tableview）的内容

MasterViewController.h

#import <UIKit/UIKit.h>

#import <CoreData/CoreData.h>

@interface XMMasterViewController : UITableViewController <NSFetchedResultsControllerDelegate>

@property (strong, nonatomic) NSFetchedResultsController *fetchedResultsController;
@property (strong, nonatomic) NSManagedObjectContext *managedObjectContext;

@end

#import <UIKit/UIKit.h>

@interface XMDetailViewController : UIViewController {
//    IBOutlet UISwitch *switchButton;
}

@property (strong, nonatomic) id detailItem;
@property (weak, nonatomic) IBOutlet UILabel *titleLabel;
@property (weak, nonatomic) IBOutlet UILabel *locationLabel;
@property (weak, nonatomic) IBOutlet UILabel *timeLabel;
@property (weak, nonatomic) IBOutlet UITextView *todoTextView;
@property (weak, nonatomic) IBOutlet UIView *selectionView;
- (IBAction)todoDoneTouched:(UIButton *)sender;
- (IBAction)shareTouched:(id)sender;
@end

#导入
#进口
@接口XMMasterViewController:UITableViewController
@属性（强，非原子）NSFetchedResultsController*fetchedResultsController；
@属性（强，非原子）NSManagedObjectContext*managedObjectContext；
@结束

MasterViewController.m

#import "XMMasterViewController.h"
#import "XMDetailViewController.h"
#import "XMEditViewController.h"


@interface XMMasterViewController ()
@property (nonatomic, strong) XMDetailViewController *detailViewController;
- (void)configureCell:(UITableViewCell *)cell atIndexPath:(NSIndexPath *)indexPath;
- (void)dataChangedFromICloud:(NSNotification*)note;
@end

@implementation XMMasterViewController


- (void)awakeFromNib
{
    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad) {
        self.clearsSelectionOnViewWillAppear = NO;
        self.preferredContentSize = CGSizeMake(320.0, 600.0);
    }
    [super awakeFromNib];
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    self.navigationItem.leftBarButtonItem = self.editButtonItem;

    UIBarButtonItem *addButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(insertNewObject:)];
    self.navigationItem.rightBarButtonItem = addButton;
    self.detailViewController = (XMDetailViewController *)[[self.splitViewController.viewControllers lastObject] topViewController];
    dispatch_async(dispatch_get_main_queue(), ^{
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(dataChangedFromICloud:) name:@"databaseChanged" object:nil];
    });
    [self.tableView reloadData];


}


- (void)viewDidUnload
{
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (void)insertNewObject:(id)sender
{
    NSManagedObjectContext *context = [self.fetchedResultsController managedObjectContext];
    NSEntityDescription *entity = [[self.fetchedResultsController fetchRequest] entity];
    NSManagedObject *newManagedObject = [NSEntityDescription insertNewObjectForEntityForName:[entity name] inManagedObjectContext:context];

    // If appropriate, configure the new managed object.
    // Normally you should use accessor methods, but using KVC here avoids the need to add a custom class to the template.
    [newManagedObject setValue: NSLocalizedString(@"name", nil) forKey:@"title"];
    [newManagedObject setValue:[NSDate date] forKey:@"timestamp"];
    [newManagedObject setValue:[NSDate date] forKey:@"creationDate"];
    [newManagedObject setValue: nil forKey:@"text"];
    [newManagedObject setValue: NSLocalizedString(@"place", nil) forKey:@"location"];

    // Save the context.
    NSError *error = nil;
    if (![context 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();
    }

    [self performSegueWithIdentifier:@"addSegue" sender:newManagedObject];

}

#pragma mark - Table View
/*- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    NSArray *array = [[NSArray alloc] initWithObjects:@"Noch zu erledigen",@"Erledigt",nil];

    return array.count;
}*/


- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return [[self.fetchedResultsController sections] count];
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    id <NSFetchedResultsSectionInfo> sectionInfo = [self.fetchedResultsController sections][section];
    return [sectionInfo numberOfObjects];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath];
    [self configureCell:cell atIndexPath:indexPath];
    return cell;
}

- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Return NO if you do not want the specified item to be editable.
    return YES;
}

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (editingStyle == UITableViewCellEditingStyleDelete) {
        NSManagedObjectContext *context = [self.fetchedResultsController managedObjectContext];
        [context deleteObject:[self.fetchedResultsController objectAtIndexPath:indexPath]];

        NSError *error = nil;
        if (![context 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();
        }
    }   
}

- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath
{
    // The table view should not be re-orderable.
    return NO;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad) {
        NSManagedObject *object = [[self fetchedResultsController] objectAtIndexPath:indexPath];
        self.detailViewController.detailItem = object;
        self.detailViewController.selectionView.hidden = YES;
    }
}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([[segue identifier] isEqualToString:@"showDetail"]) {
        NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
        NSManagedObject *object = [[self fetchedResultsController] objectAtIndexPath:indexPath];
        [[segue destinationViewController] setDetailItem:object];
    } else if ([segue.identifier isEqualToString:@"addSegue"]) {
        XMEditViewController *editVC = segue.destinationViewController;
        editVC.detailItem = sender;
    }
}

#pragma mark - Fetched results controller

- (NSFetchedResultsController *)fetchedResultsController
{
    if (_fetchedResultsController != nil) {
        return _fetchedResultsController;
    }

    NSManagedObjectContext* context = [self managedObjectContext];
    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
    // Edit the entity name as appropriate.
    NSEntityDescription* entity = [NSEntityDescription entityForName:@"Todo" inManagedObjectContext:context];
    [fetchRequest setEntity:entity];


    // Set the batch size to a suitable number.
    [fetchRequest setFetchBatchSize:20];

    // Edit the sort key as appropriate.
    NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"timestamp" ascending:YES];
    NSArray *sortDescriptors = @[sortDescriptor];

    [fetchRequest setSortDescriptors:sortDescriptors];

    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"done == %@", @(NO)];

    [fetchRequest setPredicate:predicate];


    // Edit the section name key path and cache name if appropriate.
    // nil for section name key path means "no sections".
    NSFetchedResultsController *aFetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:self.managedObjectContext sectionNameKeyPath:@"done" cacheName:nil];
    aFetchedResultsController.delegate = self;
    self.fetchedResultsController = aFetchedResultsController;

    NSError *error = nil;
    if (![self.fetchedResultsController performFetch:&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();
    }

    return _fetchedResultsController;
}

- (void)controllerWillChangeContent:(NSFetchedResultsController *)controller
{
    [self.tableView beginUpdates];
}

- (void)controller:(NSFetchedResultsController *)controller didChangeSection:(id <NSFetchedResultsSectionInfo>)sectionInfo
           atIndex:(NSUInteger)sectionIndex forChangeType:(NSFetchedResultsChangeType)type
{
    switch(type) {
        case NSFetchedResultsChangeInsert:
            [self.tableView insertSections:[NSIndexSet indexSetWithIndex:sectionIndex] withRowAnimation:UITableViewRowAnimationFade];
            break;

        case NSFetchedResultsChangeDelete:
            [self.tableView deleteSections:[NSIndexSet indexSetWithIndex:sectionIndex] withRowAnimation:UITableViewRowAnimationFade];
            break;
    }
}

- (void)controller:(NSFetchedResultsController *)controller didChangeObject:(id)anObject
       atIndexPath:(NSIndexPath *)indexPath forChangeType:(NSFetchedResultsChangeType)type
      newIndexPath:(NSIndexPath *)newIndexPath
{
    UITableView *tableView = self.tableView;

    switch(type) {
        case NSFetchedResultsChangeInsert:
            [tableView insertRowsAtIndexPaths:@[newIndexPath] withRowAnimation:UITableViewRowAnimationFade];
            break;

        case NSFetchedResultsChangeDelete:
            [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
            break;

        case NSFetchedResultsChangeUpdate:
            [self configureCell:[tableView cellForRowAtIndexPath:indexPath] atIndexPath:indexPath];
            break;

        case NSFetchedResultsChangeMove:
            [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
            [tableView insertRowsAtIndexPaths:@[newIndexPath] withRowAnimation:UITableViewRowAnimationFade];
            break;
    }

}

- (void)controllerDidChangeContent:(NSFetchedResultsController *)controller
{
    [self.tableView reloadData];
    [self.tableView endUpdates];
}





- (void)configureCell:(UITableViewCell *)cell atIndexPath:(NSIndexPath *)indexPath
{
    NSManagedObject *object = [self.fetchedResultsController objectAtIndexPath:indexPath];
    cell.textLabel.text = [object valueForKey:@"title"];
    cell.detailTextLabel.text = @"Test";
    NSDate *date = [object valueForKey:@"timestamp"];
    NSDateFormatter *format = [[NSDateFormatter alloc] init];
    [format setDateFormat:@"dd.MM.yyyy"];
    NSDate *time = [object valueForKey:@"timestamp"];
    NSDateFormatter *timeformat = [NSDateFormatter new];
    [timeformat setDateFormat:@"HH:mm"];
    cell.detailTextLabel.text = [NSString stringWithFormat:NSLocalizedString(@"display",nil), [format stringFromDate:date], [timeformat stringFromDate:time]];
}

#pragma mark - iCloud refresh

- (void)dataChangedFromICloud:(NSNotification*)note
{
    dispatch_async(dispatch_get_main_queue(), ^{
        NSError *error = nil;

        if(self.fetchedResultsController) {
            if([self.fetchedResultsController performFetch:&error]) {
                NSLog(@"Error! %@ %@", error, [error userInfo]);
            }
            [self.tableView reloadData];

        }

    });
}



@end

#import "XMDetailViewController.h"
#import "XMEditViewController.h"
#import "XMInfoViewController.h"

#import <Social/Social.h>

@interface XMDetailViewController ()
@property (strong, nonatomic) UIPopoverController *masterPopoverController;
- (void)configureView;
@end

@implementation XMDetailViewController

#pragma mark - Managing the detail item

- (void)setDetailItem:(id)newDetailItem
{
    if (_detailItem != newDetailItem) {
        _detailItem = newDetailItem;

        // Update the view.
        [self configureView];
    }
    if (self.masterPopoverController != nil) {
        [self.masterPopoverController dismissPopoverAnimated:YES];
    }
}

- (void)configureView
{
    // Update the user interface for the detail item.

    if (self.detailItem) {
        self.titleLabel.text = [self.detailItem valueForKey:@"title"];
        self.todoTextView.text = [self.detailItem valueForKey:@"text"];
        self.locationLabel.text = [self.detailItem valueForKey:@"location"];

        NSDate *date = [self.detailItem valueForKey:@"timestamp"];
        NSDateFormatter *format = [NSDateFormatter new];
        [format setDateFormat:@"dd.MM.yyyy"];
        NSDate *time = [self.detailItem valueForKey:@"timestamp"];
        NSDateFormatter *timeformat = [NSDateFormatter new];
        [timeformat setDateFormat:@"HH:mm"];

        self.timeLabel.text = [NSString stringWithFormat:NSLocalizedString(@"display",nil), [format stringFromDate:date], [timeformat stringFromDate:time]];
    }
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
   // switchButton.on = [[self.detailItem valueForKey:@"done"] boolValue];


}
- (void)viewWillAppear:(BOOL)animated
{
    [self configureView];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}



- (IBAction)todoDoneTouched:(UIButton *)sender {
    [self.detailItem setValue:@(YES) forKey:@"done"];

    NSManagedObjectContext *context = [self.detailItem managedObjectContext];
    NSError *error = nil;


    if(![context save:&error]) {
        NSLog(NSLocalizedString(@"error1",nil), error, [error userInfo]);
        abort();
    }

    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad) {
        self.selectionView.hidden = NO;
    }


    [self.navigationController popViewControllerAnimated:YES];
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"myTodo" message:NSLocalizedString(@"done2",nil) delegate:nil cancelButtonTitle:@"Okay" otherButtonTitles:nil, nil];
    [alert show];
    NSLog(NSLocalizedString(@"done1",nil));


}
/*-(IBAction)theSwitch {
    if (switchButton.on) {
        [self.detailItem setValue:@(YES) forKey:@"done"];
        NSManagedObjectContext *context = [self.detailItem managedObjectContext];
        NSError *error = nil;

        if(![context save:&error]) {
            NSLog(NSLocalizedString(@"error1",nil), error, [error userInfo]);
            abort();
        }
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"myTodo" message:NSLocalizedString(@"done2",nil) delegate:nil cancelButtonTitle:@"Okay" otherButtonTitles:nil, nil];
        [alert show];
        NSLog(NSLocalizedString(@"done1",nil));

    } else {
        [self.detailItem setValue:@(NO) forKey:@"done"];
        NSManagedObjectContext *context = [self.detailItem managedObjectContext];
        NSError *error = nil;

        if(![context save:&error]) {
            NSLog(NSLocalizedString(@"error1",nil), error, [error userInfo]);
            abort();
        }
    }
}
*/


- (IBAction)shareTouched:(id)sender {
    NSString *titleString = [self.detailItem valueForKey:@"title"];
    NSDate *date = [self.detailItem valueForKey:@"timestamp"];
    NSDateFormatter *format = [NSDateFormatter new];
    [format setDateFormat:@"dd.MM.yyyy"];
    NSDate *time = [self.detailItem valueForKey:@"timestamp"];
    NSDateFormatter *timeformat = [NSDateFormatter new];
    [timeformat setDateFormat:@"HH:mm"];

    NSString *initialString = [NSString stringWithFormat:NSLocalizedString(@"post",nil), titleString, [format stringFromDate:date], [timeformat stringFromDate:time]];
    NSURL *url = [NSURL URLWithString:@"http://s.xnmn.de/mytodo"];
    UIImage *image = [UIImage imageNamed:@"AppIcon76x76@2x"];

    NSArray *activityItems = [NSArray arrayWithObjects:initialString, image, url, nil];

    UIActivityViewController *activityViewController = [[UIActivityViewController alloc] initWithActivityItems:activityItems applicationActivities:nil];
    activityViewController.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
    activityViewController.excludedActivityTypes = @[UIActivityTypePrint, UIActivityTypeCopyToPasteboard, UIActivityTypeAssignToContact, UIActivityTypeSaveToCameraRoll, UIActivityTypeAddToReadingList];

    [self presentViewController:activityViewController animated:YES completion:nil];
}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

    if([segue.identifier isEqualToString:@"editSegue"]){
        XMEditViewController *editVC = segue.destinationViewController;
        editVC.detailItem = self.detailItem;
    }
}



- (void)splitViewController:(UISplitViewController *)splitController willHideViewController:(UIViewController *)viewController withBarButtonItem:(UIBarButtonItem *)barButtonItem forPopoverController:(UIPopoverController *)popoverController
{
    barButtonItem.title = NSLocalizedString(@"Master",nil);
    [self.navigationItem setLeftBarButtonItem:barButtonItem animated:YES];
    self.masterPopoverController = popoverController;
}

- (void)splitViewController:(UISplitViewController *)splitController willShowViewController:(UIViewController *)viewController invalidatingBarButtonItem:(UIBarButtonItem *)barButtonItem
{
    // Called when the view is shown again in the split view, invalidating the button and popover controller.
    [self.navigationItem setLeftBarButtonItem:nil animated:YES];
    self.masterPopoverController = nil;
}
@end

#导入“XMMasterViewController.h”
#导入“XMDetailViewController.h”
#导入“XMEditViewController.h”
@接口XMMasterViewController（）
@属性（非原子，强）XMDetailViewController*detailViewController；
-（void）configureCell:（UITableViewCell*）单元格atIndexPath:（NSIndexPath*）indexPath；
-（作废）来自云的数据更改：（NSNotification*）注释；
@结束
@MasterViewController的实现
-（无效）从NIB中唤醒
{
if（[[UIDevice currentDevice]userInterfaceIdiom]==UIUserInterfaceIdiomPad）{
self.clearselectiononviewwillappear=否；
self.preferredContentSize=CGSizeMake（320.0600.0）；
}
[超级awakeFromNib]；
}
-（无效）viewDidLoad
{
[超级视图下载]；
//加载视图后，通常从nib执行任何其他设置。
self.navigationItem.leftBarButtonItem=self.editButtonItem；
UIBarButtonItem*addButton=[[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemAddTarget:self action:@selector（insertNewObject:）]；
self.navigationItem.rightBarButtonItem=addButton；
self.detailViewController=（XMDetailViewController*）[[self.splitViewController.viewControllers lastObject]topViewController]；
dispatch\u async（dispatch\u get\u main\u queue（）^{
[[NSNotificationCenter defaultCenter]添加观察者：自选择器：@selector（DataChangedFromicCloud:）名称：@“databaseChanged”对象：nil]；
});
[self.tableView重载数据]；
}
-（无效）视图卸载
{
[[NSNotificationCenter defaultCenter]移除观察者：self]；
}
-（无效）未收到记忆警告
{
[超级记忆警告]；
//处置所有可以重新创建的资源。
}
-（void）insertNewObject:（id）发送方
{
NSManagedObjectContext*上下文=[self.fetchedResultsController managedObjectContext]；
NSEntityDescription*实体=[[self.fetchedResultsController fetchRequest]实体]；
NSManagedObject*newManagedObject=[NSEntityDescription insertNewObjectForEntityForName:[实体名称]在ManagedObjectContext:context]中；
//如果合适，请配置新的托管对象。
//通常您应该使用访问器方法，但是在这里使用KVC可以避免向模板添加自定义类。
[newManagedObject设置值：NSLocalizedString（@“name”，nil）forKey:@“title”]；
[newManagedObject setValue:[NSDate date]forKey:@“时间戳”]；
[newManagedObject setValue:[NSDate date]forKey:@“creationDate”]；
[newManagedObject设置值：nil forKey:@“text”]；
[newManagedObject设置值：NSLocalizedString（@“place”，nil）forKey:@“location”]；
//保存上下文。
n错误*错误=nil；
如果（！[上下文保存：&错误]）{
//将此实现替换为适当处理错误的代码。
//abort（）导致应用程序生成崩溃日志并终止。您不应该在装运应用程序中使用此函数，尽管它在开发过程中可能很有用。
NSLog（@“未解决的错误%@，%@”，错误，[error userInfo]）；
中止（）；
}
[self-PerformsgueWithIdentifier:@“addSegue”发件人：newManagedObject]；
}
#pragma标记-表视图
/*-（NSInteger）表格视图中的节数：（UITableView*）表格视图{
NSArray*数组=[[NSArray alloc]initWithObjects:@“Noch zu erledigen”，“Erledigt”，nil]；
返回array.count；
}*/
-（NSInteger）表格视图中的节数：（UITableView*）表格视图
{
返回[[self.fetchedResultsController节]计数]；
}
-（NSInteger）表视图：（UITableView*）表视图行数节：（NSInteger）节
{
id sectionInfo=[self.fetchedResultsController sections][section]；
返回[sectionInfo numberOfObjects]；
}
-（UITableViewCell*）tableView:（UITableView*）tableView cellForRowAtIndexPath:（NSIndexPath*）indexPath
{
UITableViewCell*cell=[tableView dequeueReusableCellWithIdentifier:@“cell”forIndexPath:indexPath]；
[self-configureCell:cell-atIndexPath:indexPath]；
返回单元；
}
-（BOOL）tableView:（UITableView*）tableView caneditrowatinexpath:（nsindepath*）indepath
{
//如果不希望指定的项可编辑，则返回“否”。
返回YES；
}
-（void）tableView:（UITableView*）tableView提交的编辑样式：（UITableViewCellEditingStyle）行的编辑样式索引路径：（NSIndexPath*）索引路径
{
如果（editingStyle==UITableViewCellEditingStyleDelete）{
NSManagedObjectContext*上下文=[self.fetchedResultsController managedObjectContext]；
[上下文删除对象：[self.fetchedResultsController对象索引路径：indexPath]]；
n错误*错误=nil；
如果（！[上下文保存：&错误]）{
//将此实现替换为适当处理错误的代码。
//abort（）导致应用程序生成崩溃日志并终止。您不应该在装运应用程序中使用此函数，尽管它在开发过程中可能很有用。
NSLog（@“未解决的错误%@，%@”，错误，[error userInfo]）；
中止（）；
}
}   
}
-（BOOL）tableView:（UITableView*）tableView可以移动rowatinexpath:（nsindepath*）indepath
{
//表视图不应可重新排序。
返回否；
}
-（void）tableView:（UITableView*）tableView未选择RowatineXpath:（NSIndexPath*）indexPath
{
if（[[UIDevice currentDevice]userInterfaceIdiom]==UIUserInterfaceIdiomPad）{