あと、指定したビューに戻ったときに、そのビューのメソッドも実行する方法も。
FirstView、SecondView、ThirdView、FourthViewの４つビューを作って、FourthViewに以下の処理を行わせるボタンを作成する。
・SecondViewへ戻る
・SecondViewへ戻る＋SecondViewのメソッドを実行
・rootビューへ戻る
以下コード。
主要部分だけを説明していく。赤字の部分がポイント箇所。
◎AppDelegate.h
#import <UIKit/UIKit.h>
#import "FirstViewController.h"
@interface AppDelegate : UIResponder
@property (strong, nonatomic) UIWindow *window;
@property (strong, nonatomic) FirstViewController *firstViewController;
@end
◎AppDelegate.m
#import "AppDelegate.h"
@implementation AppDelegate
@synthesize window = _window;
@synthesize firstViewController = _firstViewController;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
self.firstViewController = [[FirstViewController alloc] initWithNibName:@"FirstViewController" bundle:nil];
// ナビゲーションコントローラを追加
UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:self.firstViewController];
self.window.rootViewController = navigationController;
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
return YES;
}
@end
------------------------------------------------------
◎FirstViewController.h
#import <UIKit/UIKit.h>
#import "SecondViewController.h"
@interface FirstViewController : UIViewController {
}
- (void)navigationRightBtnAction;
@end
◎FirstViewController.m
#import "FirstViewController.h"
@implementation FirstViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
// ナビゲーションバーのタイトルを設定
self.navigationItem.title = @"FirstView";
// ナビゲーションバー Rightボタン
UIBarButtonItem *rightBarItem = [[UIBarButtonItem alloc] initWithTitle:@"次へ"
style:UIBarButtonItemStyleBordered
target:self
action:@selector(navigationRightBtnAction)];
self.navigationItem.rightBarButtonItem = rightBarItem;
}
/* ============================================================================== */
#pragma mark - Button Action
/* ============================================================================== */
// ナビゲーションバーのRightボタンアクション
- (void)navigationRightBtnAction
{
// SecondViewControllerへ遷移
SecondViewController *secondViewController;
secondViewController = [[SecondViewController alloc]
initWithNibName:@"SecondViewController"
bundle:nil];
[self.navigationController pushViewController:secondViewController animated:YES];
}
@end
------------------------------------------------------
◎SecondViewController.h
#import <UIKit/UIKit.h>
#import "ThirdViewController.h"
@interface SecondViewController : UIViewController {
}
- (void)labelView;
- (void)navigationRightBtnAction;
@end
◎SecondViewController.m
#import "SecondViewController.h"
@implementation SecondViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
// ナビゲーションバーのタイトルを設定
self.navigationItem.title = @"SecondView";
// ナビゲーションバー Rightボタン
UIBarButtonItem *rightBarItem = [[UIBarButtonItem alloc] initWithTitle:@"次へ"
style:UIBarButtonItemStyleBordered
target:self
action:@selector(navigationRightBtnAction)];
self.navigationItem.rightBarButtonItem = rightBarItem;
}
// FourthViewからの遷移時に実行
- (void)labelView
{
// ラベルを表示
UILabel *label = [[UILabel alloc] init];
label.frame = CGRectMake(60, 100, 100, 30);
label.backgroundColor = [UIColor yellowColor];
label.text = @"text";
[self.view addSubview:label];
}
/* ============================================================================== */
#pragma mark - Button Action
/* ============================================================================== */
// ナビゲーションバーのRightボタンアクション
- (void)navigationRightBtnAction
{
// ThirdViewControllerへ遷移
ThirdViewController *thirdViewController;
thirdViewController = [[ThirdViewController alloc]
initWithNibName:@"ThirdViewController"
bundle:nil];
[self.navigationController pushViewController:thirdViewController animated:YES];
}
@end
------------------------------------------------------
◎ThirdViewController.h
#import <UIKit/UIKit.h>
#import "FourthViewController.h"
@interface ThirdViewController : UIViewController {
}
- (void)navigationRightBtnAction;
@end
◎ThirdViewController.m
#import "ThirdViewController.h"
@implementation ThirdViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
// ナビゲーションバーのタイトルを設定
self.navigationItem.title = @"ThirdView";
// ナビゲーションバー Rightボタン
UIBarButtonItem *rightBarItem = [[UIBarButtonItem alloc] initWithTitle:@"次へ"
style:UIBarButtonItemStyleBordered
target:self
action:@selector(navigationRightBtnAction)];
self.navigationItem.rightBarButtonItem = rightBarItem;
}
/* ============================================================================== */
#pragma mark - Button Action
/* ============================================================================== */
// ナビゲーションバーのRightボタンアクション
- (void)navigationRightBtnAction
{
// ThirdViewControllerへ遷移
FourthViewController *fourthViewController;
fourthViewController = [[FourthViewController alloc]
initWithNibName:@"FourthViewController"
bundle:nil];
[self.navigationController pushViewController:fourthViewController animated:YES];
}
@end
------------------------------------------------------
◎FourthViewController.h
#import <UIKit/UIKit.h>
#import "SecondViewController.h"
@interface FourthViewController : UIViewController {
}
- (void)btnAction:(UIButton*)sender;
@end
◎FourthViewController.m
#import "FourthViewController.h"
@implementation FourthViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
// ナビゲーションバーのタイトルを設定
self.navigationItem.title = @"FourthView";
// ボタン1
UIButton *btn1 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
btn1.frame = CGRectMake(30, 120, 260, 30);
btn1.tag = 1;
[btn1 setTitle:@"SecondViewへ遷移" forState:UIControlStateNormal];
[btn1 addTarget:self action:@selector(btnAction:)forControlEvents:UIControlEventTouchDown];
[self.view addSubview:btn1];
// ボタン2
UIButton *btn2 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
btn2.frame = CGRectMake(30, 180, 260, 30);
btn2.tag = 2;
[btn2 setTitle:@"SecondViewへ遷移してメソッド実行" forState:UIControlStateNormal];
[btn2 addTarget:self action:@selector(btnAction:)forControlEvents:UIControlEventTouchDown];
[self.view addSubview:btn2];
// ボタン3
UIButton *btn3 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
btn3.frame = CGRectMake(30, 240, 260, 30);
btn3.tag = 3;
[btn3 setTitle:@"rootViewへ遷移" forState:UIControlStateNormal];
[btn3 addTarget:self action:@selector(btnAction:)forControlEvents:UIControlEventTouchDown];
[self.view addSubview:btn3];
}
/* ============================================================================== */
#pragma mark - Button Action
/* ============================================================================== */
- (void)btnAction:(UIButton*)sender
{
if (sender.tag == 1) {
// SecondViewControllerへ戻る
[self.navigationController popToViewController:[self.navigationController.viewControllers objectAtIndex:1] animated:YES];
}
else if (sender.tag == 2) {
// SecondViewControllerへ戻ってメソッドを実行
SecondViewController *secondViewController = [self.navigationController.viewControllers objectAtIndex:1];
[secondViewController labelView];
[self.navigationController popToViewController:secondViewController animated:YES];
}
else
{
// 一番初めのViewへ戻る
[self.navigationController popToRootViewControllerAnimated:YES];
}
}
@end
以上がコード。
あまり大したことは書いてない。
重要なのはFourthViewControllerに書いた赤字の箇所くらい。
ビルドして実行した結果が下記画像。
↓ 「次へ」ボタンを押下
↓ 「次へ」ボタンを押下
↓ 「次へ」ボタンを押下
↓ 「SecondViewへ遷移してメソッド実行」ボタンを押下
一気にSecondViewControllerへ戻り、且つSecondViewControllerのメソッドが実行されてラベルが表示されてる。
ちなみに、
「SecondViewへ遷移」ボタンは、押下するとSecondViewControllerへ戻るだけ。ラベルを表示するメソッドは実行されない。
「rootViewへ遷移」ボタンは、押下するとFirstViewControllerへ戻る。
SecondViewにpropoertyとかで変数を用意しておけば（例えば変数strだとする）、popで戻る前に
secondViewController.str = @"aaa";
のように記述すれば値を渡すことも可能。
使用頻度は低そうだけど、そのうち使うこともあるかも。
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サンプルソース：https://github.com/tetsuco/SampleUINavigationControllerBack