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多视图应用
一、效果
1. 启动进入蓝色视图界面
2. 点击“按我”按钮跳出警告框
3. 点击最下按钮“Switch View”跳转到黄色视图
二、分析
1. 由三个控制器组成，一个根控制器，控制蓝色视图控制器与黄色视图控制器的转换
2. 最下方的工具栏始终位于视图的最顶层，才不至于被视图覆盖
3. 程序启动只需加载其一，所以用懒加载加载另一视图
三、 实现
1. 使用Main.Storyboard搭建布局
2. 创建蓝、黄控制器模型
3.SwichingViewController.m实现代码
1 // 2 // ViewController.m 3 // 6.1-多视图应用 4 // 5 // Created by LinKun on 16/7/15. 6 // Copyright © 2016年 Apress. All rights reserved. 7 // 8 #pragma mark - 根控制器复制两个视图控制器的转换，所以应该包含它们 9 #import "SwitchingViewController.h"10 #import "BlueViewController.h"11 #import "YellowViewController.h"12 13 @interface SwitchingViewController ()14 // 两个子视图控制器15 @property (strong, nonatomic) YellowViewController *yellowViewController;16 @property (strong, nonatomic) BlueViewController *blueViewController;17 18 @end19 20 @implementation SwitchingViewController21 22 - (void)viewDidLoad {23 [super viewDidLoad];24 // Do any additional setup after loading the view, typically from a nib.25 26 // 实例化storyboard中标记为“Blue”的视图控制器，及蓝色视图控制器的位置大小27 self.blueViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"Blue"];28 self.blueViewController.view.frame = self.view.frame;29 // 切换控制器30 [self switchViewFromViewController:nil toViewController:self.blueViewController];31 32 }33 34 #pragma mark - 按钮动作35 - (IBAction)switchViews:(id)sender {36 // 懒加载：加载将要切换到的控制器37 if (!self.yellowViewController.view.superview) {38 if (!self.yellowViewController) {39 self.yellowViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"Yellow"];40 }41 }else {42 if (!self.blueViewController) {43 self.blueViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"Blue"];44 }45 }46 47 // 动画效果：开始动画，持续0.4s，运动曲线48 [UIView beginAnimations:@"View Flip" context:NULL];49 [UIView setAnimationDuration:0.4];50 [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];51 52 53 if (!self.yellowViewController.view.superview) {54 // 动画过渡55 [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromRight forView:self.view cache:YES];56 self.yellowViewController.view.frame = self.view.frame;57 [self switchViewFromViewController:self.blueViewController toViewController:self.yellowViewController];58 } else {59 [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:self.view cache:YES];60 self.blueViewController.view.frame = self.view.frame;61 [self switchViewFromViewController:self.yellowViewController toViewController:self.blueViewController];62 }63 [UIView commitAnimations];64 }65 66 #pragma mark - 转换控制器67 - (void)switchViewFromViewController:(UIViewController *)fromVC toViewController:(UIViewController *)toVC {68 // 把当前控制器移除69 if (fromVC != nil) {70 [fromVC willMoveToParentViewController:nil];71 [fromVC.view removeFromSuperview];72 [fromVC removeFromParentViewController];73 }74 // 把转换的控制器加进来75 if (toVC != nil) {76 [self addChildViewController:toVC];77 [self.view insertSubview:toVC.view atIndex:0];78 [toVC didMoveToParentViewController:self];79 }80 81 }82 83 @end
备注：要切换控制器，先将要切换到的控制器加载出来，然后移除当前控制器，把另一控制器加载到根控制器
4. BlueViewController.h
1 // 2 // BlueViewController.m 3 // 6.1-多视图应用 4 // 5 // Created by LinKun on 16/7/15. 6 // Copyright © 2016年 Apress. All rights reserved. 7 // 8 9 #import "BlueViewController.h"10 11 @interface BlueViewController ()12 13 @end14 15 @implementation BlueViewController16 17 - (void)viewDidLoad {18 [super viewDidLoad];19 // Do any additional setup after loading the view.20 }21 22 #pragma mark - 蓝色视图按钮动作23 - (IBAction)blueButtonPressed:(id)sender {24 25 // 创建警告表单26 UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"Blue View Button Pressed" message:@"You pressed the button on the blue view" preferredStyle:UIAlertControllerStyleAlert];27 // 创建按钮28 UIAlertAction *action = [UIAlertAction actionWithTitle:@"Yes i did" style:UIAlertActionStyleDefault handler:nil];29 // 把按钮加到表单，把控制权交给表单30 [alert addAction:action];31 [self presentViewController:alert animated:YES completion:nil];32 }33 34 @end
5. YellowViewController.m
1 // 2 // YellowViewController.m 3 // 6.1-多视图应用 4 // 5 // Created by LinKun on 16/7/15. 6 // Copyright © 2016年 Apress. All rights reserved. 7 // 8 9 #import "YellowViewController.h"10 11 @interface YellowViewController ()12 13 @end14 15 @implementation YellowViewController16 17 - (void)viewDidLoad {18 [super viewDidLoad];19 // Do any additional setup after loading the view.20 }21 22 #pragma mark - 黄色视图按钮动作23 - (IBAction)yellowButtonPressed:(id)sender {24 // 创建警告表单25 UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"Yellow View Button Pressed" message:@"You pressed the yellow on the blue view" preferredStyle:UIAlertControllerStyleAlert];26 // 创建按钮27 UIAlertAction *action = [UIAlertAction actionWithTitle:@"Yes i did" style:UIAlertActionStyleDefault handler:nil];28 29 // 把按钮加到表单，把控制器权交给表单30 [alert addAction:action];31 [self presentViewController:alert animated:YES completion:nil];32 }33 34 @end
多视图应用
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