需求

點選按鈕實現兩個介面的切換，如果用一個controller管理，那麼程式碼顯得過於龐大。這時候用BSTwoControllerView可以優雅的把程式碼分在兩個controller來管理。

效果

1. 點選OneVC按鈕切換至OneVC控制器，點選TwoVC按鈕切換至TwoVC控制器。
2. github地址: https://github.com/FreeBaiShun/BSTwoControllerView

用法

1. pod ‘BSTwoControllerView’
2. 編寫程式碼

#import "ViewController.h"
#import "OneVC.h"
#import "TwoVC.h"
#import "BSTwoControllerView/BSTwoControllerView.h"

@interface ViewController ()
@property (weak, nonatomic) IBOutlet BSTwoControllerView *viewBottom;

@end

@implementation ViewController{
OneVC *oneVC;
TwoVC *twoVC;
}

- (void)viewDidLoad {
[super viewDidLoad];

oneVC = [OneVC new];
twoVC = [TwoVC new];
[self.viewBottom initTwoControllerWithMainController:self controller1:oneVC controller2:twoVC];
}
- (IBAction)btnOneVC:(id)sender {
[self.viewBottom setDisplayWithController:oneVC];
}

- (IBAction)btnTwoVC:(id)sender {
[self.viewBottom setDisplayWithController:twoVC];
}

@end
 

程式碼分析

1. initTwoControllerWithMainController作為初始化程式碼

   - (void)initTwoControllerWithMainController:(UIViewController *)mainController controller1:(UIViewController *)controller1 controller2:(UIViewController *)controller2{
       __weak typeof (self) weakeSelf = self;
       weakeSelf.mainController = mainController;
       
       [mainController addChildViewController:controller1];
       controller1.view.frame = self.bounds;
       [weakeSelf addSubview:controller1.view];
   
       [mainController addChildViewController:controller2];
   
       weakeSelf.controllerCur = controller1;
       [controller1.view.superview layoutIfNeeded];
   }
    
   

   • mainController新增子控制器controller1。修改controller1的frame修改，並新增其view這樣會實現走controller1的viewDidLoad方法。
   • mainController新增子控制器controller2儲存當前的控制器為controller1。

2. setDisplayWithController切換控制器方法

   - (void)setDisplayWithController:(UIViewController *)controller{
       if (_controllerCur != controller) {
           controller.view.frame = self.bounds;
           __weak typeof (self) weakeSelf = self;
           [_mainController transitionFromViewController:_controllerCur toViewController:controller duration:0.2 options:UIViewAnimationOptionTransitionCrossDissolve animations:nil completion:^(BOOL finished) {
               if (finished) {
                   weakeSelf.controllerCur = controller;
               }
           }];
       }
   }
    
   

   1. controller.view.frame修改當前要切換的控制器的view大小。
   2. 呼叫transitionFromViewController方法實現控制器的切換，當切換完成時候儲存當前控制器即可