主要詳細模板不顯示行

Question

我使用Master - Detail應用程序在xcode中創建一個新項目。每次運行我的程序時，這些行在主視圖中都不可見。提前致謝！請檢查下面我的代碼...

MasterViewController.h

#import <UIKit/UIKit.h> 
@class DetailViewController; 
@interface MasterViewController : UITableViewController 
@property (strong, nonatomic) DetailViewController *detailViewController; 
@end 

MasterViewController.m

#import "MasterViewController.h" 
#import "DetailViewController.h" 
@interface MasterViewController() 

@property NSMutableArray *objects; 
@end 

@implementation MasterViewController 

- (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] ***emphasized text***initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(insertNewObject:)]; 
self.navigationItem.rightBarButtonItem = addButton; 
self.detailViewController = (DetailViewController *) [[self.splitViewController.viewControllers lastObject] topViewController]; 
} 
-(void)viewWillAppear:(BOOL)animated { 
self.clearsSelectionOnViewWillAppear = self.splitViewController.isCollapsed; 
[super viewWillAppear:animated]; 
} 
- (void)didReceiveMemoryWarning { 
    [super didReceiveMemoryWarning]; 
    // Dispose of any resources that can be recreated. 
} 
- (void)insertNewObject:(id)sender { 
if (!self.objects) { 
    self.objects = [[NSMutableArray alloc] init]; 
} 
[self.objects insertObject:[NSDate date] atIndex:0]; 
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0]; 
[self.tableView insertRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic]; 
} 

#pragma mark - Segues 
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender { 
    if ([[segue identifier] isEqualToString:@"showDetail"]) { 
    NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow]; 
    NSDate *object = self.objects[indexPath.row]; 
    DetailViewController *controller = (DetailViewController *)[[segue destinationViewController] topViewController]; 
    [controller setDetailItem:object]; 
    controller.navigationItem.leftBarButtonItem = self.splitViewController.displayModeButtonItem; 
    controller.navigationItem.leftItemsSupplementBackButton = YES; 
} 
} 

#pragma mark - Table View 
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { 
return 1; 
} 
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection: (NSInteger)section { 
return self.objects.count; 
} 
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { 
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath]; 
NSDate *object = self.objects[indexPath.row]; 
cell.textLabel.text = [object description]; 
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) { 
    [self.objects removeObjectAtIndex:indexPath.row]; 
    [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade]; 
} else if (editingStyle == UITableViewCellEditingStyleInsert) { 
    // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view. 
} 
} 
@end 

DetailViewController.h

#import <UIKit/UIKit.h> 
@interface DetailViewController : UIViewController 
@property (strong, nonatomic) id detailItem; 
@property (weak, nonatomic) IBOutlet UILabel *detailDescriptionLabel; 
@end 

DetailViewController.m

#import "DetailViewController.h" 
@interface DetailViewController() 
@end 

@implementation DetailViewController 
#pragma mark - Managing the detail item 
-(void)setDetailItem:(id)newDetailItem { 
if (_detailItem != newDetailItem) { 
    _detailItem = newDetailItem; 
    // Update the view. 
    [self configureView]; 
    } 
} 

-(void)configureView { 
// Update the user interface for the detail item. 
if (self.detailItem) { 
    self.detailDescriptionLabel.text = [self.detailItem description]; 
} 
} 
-(void)viewDidLoad { 
[super viewDidLoad]; 
// Do any additional setup after loading the view, typically from a nib. 
[self configureView]; 
} 
-(void)didReceiveMemoryWarning { 
[super didReceiveMemoryWarning]; 
// Dispose of any resources that can be recreated. 
} 
@end 

Answer 1

我想，如果您將設備的大小縮放到75％和100％，則會顯示行。我想這與xcode有關。