分割视图的使用
分割视图是 iPad 的特定视图控制器用于管理两个视图控制器，在左侧是一个主控制器，其右侧是一个详细信息视图控制器。重要的属性
- delegate
- viewControllers
示例代码和步骤
1.创建一个新项目，选择Master Detail Application并单击下一步，输入项目名称，然后选择创建。
2.简单的分割视图控制器与母版中的表视图是默认创建的。
3.在这里我们为我们创建的下列文件。
- AppDelegate.h
- AppDelegate.m
- DetailViewController.h
- DetailViewController.m
- DetailViewController.xib
- MasterViewController.h
- MasterViewController.m
- MasterViewController.xib
4. AppDelegate.h文件如下所示
#import <UIKit/UIKit.h>@interface AppDelegate : UIResponder <UIApplicationDelegate>@property (strong, nonatomic) UIWindow *window;@property (strong, nonatomic) UISplitViewController *splitViewController;@end
5.在AppDelegate.m中的didFinishLaunchingWithOptions方法，如下所示
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; // Override point for customization after application launch. MasterViewController *masterViewController = [[MasterViewController alloc] initWithNibName:@"MasterViewController" bundle:nil]; UINavigationController *masterNavigationController = [[UINavigationController alloc] initWithRootViewController: masterViewController]; DetailViewController *detailViewController = [[DetailViewController alloc] initWithNibName:@"DetailViewController" bundle:nil]; UINavigationController *detailNavigationController = [[UINavigationController alloc] initWithRootViewController: detailViewController]; masterViewController.detailViewController = detailViewController; self.splitViewController = [[UISplitViewController alloc] init]; self.splitViewController.delegate = detailViewController; self.splitViewController.viewControllers = @[masterNavigationController, detailNavigationController]; self.window.rootViewController = self.splitViewController; [self.window makeKeyAndVisible]; return YES;}
6. MasterViewController.h，如下所示
#import <UIKit/UIKit.h>@class DetailViewController;@interface MasterViewController : UITableViewController@property (strong, nonatomic) DetailViewController *detailViewController;@end
7. MasterViewController.m，如下所示
#import "MasterViewController.h"#import "DetailViewController.h"@interface MasterViewController () { NSMutableArray *_objects;}@end@implementation MasterViewController- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *) nibBundleOrNil{ self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; if (self) { self.title = NSLocalizedString(@"Master", @"Master"); self.clearsSelectionOnViewWillAppear = NO; self.contentSizeForViewInPopover = CGSizeMake(320.0, 600.0); } return self;} - (void)viewDidLoad{ [super viewDidLoad]; self.navigationItem.leftBarButtonItem = self.editButtonItem; UIBarButtonItem *addButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem: UIBarButtonSystemItemAdd target:self action:@selector(insertNewObject:)]; self.navigationItem.rightBarButtonItem = addButton;}- (void)didReceiveMemoryWarning{ [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated.}- (void)insertNewObject:(id)sender{ if (!_objects) { _objects = [[NSMutableArray alloc] init]; } [_objects insertObject:[NSDate date] atIndex:0]; NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0]; [self.tableView insertRowsAtIndexPaths:@[indexPath] withRowAnimation: UITableViewRowAnimationAutomatic];}#pragma mark - Table View- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{ return 1;}- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection: (NSInteger)section{ return _objects.count;}// Customize the appearance of table view cells.- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath: (NSIndexPath *)indexPath{ static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier: CellIdentifier]; if (cell == nil) { cell = [[UITableViewCell alloc] initWithStyle: UITableViewCellStyleDefault reuseIdentifier:CellIdentifier]; } NSDate *object = _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) { [_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. }}/*// Override to support rearranging the table view.- (void)tableView:(UITableView *)tableView moveRowAtIndexPath: (NSIndexPath *) fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath{}*//*// Override to support conditional rearranging of the table view.- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath: (NSIndexPath *)indexPath{ // Return NO if you do not want the item to be re-orderable. return YES;}*/- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath: (NSIndexPath *)indexPath{ NSDate *object = _objects[indexPath.row]; self.detailViewController.detailItem = object; NSDateFormatter *formatter = [[NSDateFormatter alloc] init]; [formatter setDateFormat: @"yyyy-MM-dd HH:mm:ss zzz"]; NSString *stringFromDate = [formatter stringFromDate:object]; self.detailViewController.detailDescriptionLabel.text = stringFromDate;}@end8. DetailViewController.h ，如下所示
#import <UIKit/UIKit.h>@interface DetailViewController : UIViewController<UISplitViewControllerDelegate>@property (strong, nonatomic) id detailItem;@property (weak, nonatomic) IBOutlet UILabel *detailDescriptionLabel;@end
9. DetailViewController.m ，如下所示
#import "DetailViewController.h"@interface DetailViewController ()@property (strong, nonatomic) UIPopoverController *masterPopoverController;- (void)configureView;@end@implementation DetailViewController#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.detailDescriptionLabel.text = [self.detailItem description]; }}- (void)viewDidLoad{ [super viewDidLoad]; [self configureView];}- (void)didReceiveMemoryWarning{ [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated.}- (id)initWithNibName:(NSString *)nibNameOrNil bundle: (NSBundle *)nibBundleOrNil{ self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; if (self) { self.title = NSLocalizedString(@"Detail", @"Detail"); } return self;} #pragma mark - Split view- (void)splitViewController:(UISplitViewController *)splitController willHideViewController:(UIViewController *)viewController withBarButtonItem: (UIBarButtonItem *)barButtonItem forPopoverController: (UIPopoverController *)popoverController{ barButtonItem.title = NSLocalizedString(@"Master", @"Master"); [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;}@end10.现在当我们运行应用程序时，在横向模式下我们会得到下面的输出
11. 当我们切换到纵向模式，我们会获得下面的输出:
