Navigation between screens using xib files
When reading various sources, I come across projects implemented using xib files. I myself prefer using xib instead of the storyboard (I’m not writing holivar, the storyboard is also good), but often the study of navigation between screens turns into torture. And so I would like to share my own experience.
What is so good storyboard? First of all, in that it allows you to collect all the navigation and visually display most of the transitions.
Yes, using xib for each screen we lose the opportunity to visually see all the transitions (well, and even a couple of possibilities), but we get some of our advantages. I will not explicitly describe the pros and cons of using one and the other in order to avoid a holivar, just show how you can collect all the navigation using xib files, get rid of the extra use of singletones, and also eliminate connectivity between controllers.
The approach is very simple. Use Router objects for communication between screens. We divide Router into user stories. Interact using callback.
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Create a router and display a blank screen.
Implement the creation of a controller that will show records. We will also immediately connect this screen with other screens and the interaction between them.
Thus, we immediately see the navigation between the screens, and each screen does not know anything about other screens. Moreover, using blocks, we managed to eliminate the need for screen information about the router.
We can also transfer data from the screen to the screen without any problems and reduce the use of singleton.
Link to the project
What is so good storyboard? First of all, in that it allows you to collect all the navigation and visually display most of the transitions.
Yes, using xib for each screen we lose the opportunity to visually see all the transitions (well, and even a couple of possibilities), but we get some of our advantages. I will not explicitly describe the pros and cons of using one and the other in order to avoid a holivar, just show how you can collect all the navigation using xib files, get rid of the extra use of singletones, and also eliminate connectivity between controllers.
The approach is very simple. Use Router objects for communication between screens. We divide Router into user stories. Interact using callback.
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Mini demonstration in practice
- Screen with table and add record button
- Create entry screen
- Record detail view screen
Initial setup
Create a router and display a blank screen.
RXAppDelegate.m
#import "RXAppDelegate.h" #import "RXRouter.h" @implementation RXAppDelegate - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { // Override point for customization after application launch. self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; self.window.rootViewController = [[RXRouter alloc] initRouter]; [self.window makeKeyAndVisible]; return YES; } @end RXRouter.h
#import <UIKit/UIKit.h> @interface RXRouter : UINavigationController - (instancetype)initRouter; @end RXRouter.m
#import "RXRouter.h" @implementation RXRouter - (instancetype)initRouter { UIViewController *rootViewController = [self createRootViewController]; self = [super initWithRootViewController:rootViewController]; if (self != nil) { self.interactivePopGestureRecognizer.enabled = NO; } return self; } - (UIViewController *)createRootViewController { UIViewController *controller = [[UIViewController alloc] init]; return controller; } @end Implementation
Implement the creation of a controller that will show records. We will also immediately connect this screen with other screens and the interaction between them.
RXRoute.m
#import "RXRouter.h" #import "RXNoteListViewController.h" #import "RXCreateNoteViewController.h" #import "RXDetailNoteViewController.h" @implementation RXRouter - (instancetype)initRouter { UIViewController *rootViewController = [self createRootViewController]; self = [super initWithRootViewController:rootViewController]; if (self != nil) { self.interactivePopGestureRecognizer.enabled = NO; } return self; } - (UIViewController *)createRootViewController { RXNoteListViewController *noteListController = [[RXNoteListViewController alloc] init]; __weak RXRouter *weakSelf = self; __weak RXNoteListViewController *weakNoteListController = noteListController; noteListController.createNoteBlock = ^{ RXCreateNoteViewController *createNoteViewController = [weakSelf createNoteViewController]; createNoteViewController.createNoteBlock = ^(RXNote *note){ [weakNoteListController addNote:note]; [weakSelf popViewControllerAnimated:YES]; }; [weakSelf pushViewController:createNoteViewController animated:YES]; }; noteListController.detailNoteBlock = ^(RXNote *note){ RXDetailNoteViewController *detailNoteViewController = [weakSelf createDetailNoteViewControllerWithNote:note]; [weakSelf pushViewController:detailNoteViewController animated:YES]; }; return noteListController; } - (RXCreateNoteViewController *)createNoteViewController { return [[RXCreateNoteViewController alloc] init]; } - (RXDetailNoteViewController *)createDetailNoteViewControllerWithNote:(RXNote *)note { RXDetailNoteViewController *controller = [[RXDetailNoteViewController alloc] init]; [controller showNote:note]; return controller; } @end RXNoteListViewController.h
#import <UIKit/UIKit.h> @class RXNote; typedef void (^RXNoteListViewControllerCreateNoteBlock)(); typedef void (^RXNoteListViewControllerDetailNoteBlock)(RXNote *note); @interface RXNoteListViewController : UIViewController @property (copy, nonatomic) RXNoteListViewControllerCreateNoteBlock createNoteBlock; @property (copy, nonatomic) RXNoteListViewControllerDetailNoteBlock detailNoteBlock; - (void)addNote:(RXNote *)note; @end RXCreateNoteViewController.h
#import <UIKit/UIKit.h> @class RXNote; typedef void (^RXCreateNoteViewControllerCreateNoteBlock)(RXNote *note); @interface RXCreateNoteViewController : UIViewController @property (copy, nonatomic) RXCreateNoteViewControllerCreateNoteBlock createNoteBlock; @end RXDetailNoteViewController.h
#import <UIKit/UIKit.h> @class RXNote; typedef void (^RXDetailNoteViewControllerDoneBlock)(); @interface RXDetailNoteViewController : UIViewController - (void)showNote:(RXNote *)note; @end Thus, we immediately see the navigation between the screens, and each screen does not know anything about other screens. Moreover, using blocks, we managed to eliminate the need for screen information about the router.
We can also transfer data from the screen to the screen without any problems and reduce the use of singleton.
Link to the project
Source: https://habr.com/ru/post/265723/
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