iOS9 3D Touch 实现 - 小孩的技术博客

3D Touch 是什么?

With iOS 9, new iPhone models add a third dimension to the user interface.

A user can now press your Home screen icon to immediately access functionality provided by your app.

Within your app, a user can now press views to see previews of additional content and gain accelerated access to features.

简单来说3D Touch就是通过区分轻按和重按Home键来进行不同的用户交互。

模拟器如何测试?

github 大神写了一个插件在Xcode 7模拟器上调试 3D Touch, 地址：SBShortcutMenuSimulator

测试步骤：

Step1:终端 git clone https://github.com/DeskConnect/SBShortcutMenuSimulator.git
Step2: cd SBShortcutMenuSimulator
Step3: make
Step4: 打开写好的程序，模拟器运行
Step5: xcrun simctl spawn booted launchctl debug system/com.apple.SpringBoard –environment DYLD_INSERT_LIBRARIES=$PWD/SBShortcutMenuSimulator.dylib
Step6: xcrun simctl spawn booted launchctl stop com.apple.SpringBoard
Step7: echo ‘strivingboy.-DTouchDemo’ | nc 127.0.0.1 8000 注意: ‘strivingboy.-DTouchDemo’ ‘’里边写的是自己项目的Bundle identifier.

注意: 每次想要启动快速入口都要重复操作第8步.

应用场景有哪些？

3D Touch的主要应用分为三块：

1、Home Screen Quick Actions

通过主屏幕的应用icon，使用3D Touch呼出一个菜单来展示应用核心功能如：

菜单其它样式参考： 3D Touch Human Interface Guidelines

2、Peek and Pop

这个功能可为是一套全新的用户交互机制，它可以预览下一个页面的视图，并且可以进行简单的操作如：

Indication of peek availability

Peek

Peek quick actions

3、Force Properties

In iOS 9, the UITouch class has two new properties to support custom implementation of 3D Touch in your app: force and maximumPossibleForce. For the first time on iOS devices, these properties let you detect and respond to touch pressure in the UIEvent objects your app receives. The force of a touch has a high dynamic range, available as a floating point value to your app.

iOS9为供了一个新的交互参数:力度。可以检测某一交互的力度值，来做相应的交互处理。

如何实现？

1、Home Screen Quick Actions

其实现有两种方式：一：静态添加二：动态添加

静态添加只需要在项目中的plist文件中配置，然后安装就可以使用了如下图：

运行效果如下：

静态添加即使用代码方式来添加，主要用到以下几个类：
- UIApplicationShortcutIcon：创建ShortcutItem中图片icon
- UIApplicationShortcutItem：创建3D Touch的ShortcutItem
- UIMutableApplicationShortcutItem：创建可变3D Touch的ShortcutItem

如下代码：

      - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
          // Override point for customization after application launch.
      
          [self addShortcutItemDynamic:application];
          return YES;
      }
      
      - (void)addShortcutItemDynamic:(UIApplication *)application
      {
          UIApplicationShortcutItem *shareItem = [[UIApplicationShortcutItem alloc] initWithType:@"Share" localizedTitle:@"分享" localizedSubtitle:nil icon:[UIApplicationShortcutIcon iconWithType:UIApplicationShortcutIconTypeShare] userInfo:nil];
      
          UIApplicationShortcutItem *payItem = [[UIApplicationShortcutItem alloc] initWithType:@"Play" localizedTitle:@"播放" localizedSubtitle:nil icon:[UIApplicationShortcutIcon iconWithType:UIApplicationShortcutIconTypePlay] userInfo:nil];
      
          UIApplicationShortcutItem *pauseItem = [[UIApplicationShortcutItem alloc] initWithType:@"Pause" localizedTitle:@"暂停" localizedSubtitle:nil icon:[UIApplicationShortcutIcon iconWithType:UIApplicationShortcutIconTypePause] userInfo:nil];
      
          application.shortcutItems = @[shareItem,payItem,pauseItem];
      }

运行效果如下：

相应点击事件实现方法:- (void)application:(UIApplication *)application performActionForShortcutItem:(UIApplicationShortcutItem *)shortcutItem completionHandler:(void(^)(BOOL succeeded))completionHandler

注： Quick Actions最多为4个(包含静态和动态)

2、Peek and Pop

Step1:检查设备是否支持3D Touch

ViewContoller提供了一个属性：traitCollection 如：

  - (BOOL)is3DTouchAvailable
  {
      if (self.traitCollection.forceTouchCapability == UIForceTouchCapabilityAvailable) {
      return YES;
      }
      return NO;
  }

Step2: 注册预览试图

-(id<UIViewControllerPreviewing>)registerForPreviewingWithDelegate:(id<UIViewControllerPreviewingDelegate>)delegate sourceView:(UIView *)sourceView NS_AVAILABLE_IOS(9_0) 就是将sourceView这个视图注册允许使用3D Touch功能

Step3: 实现协议 UIViewControllerPreviewingDelegate

  - (nullable UIViewController *)previewingContext:(id <UIViewControllerPreviewing>)previewingContext viewControllerForLocation:(CGPoint)location
  {
      // 长按需要预览的类容
     previewingContext.sourceRect = CGRectMake(0, 0, previewingContext.sourceView.frame.size.width, previewingContext.sourceView.frame.size.height);
     PreviewViewController *vc = [[PreviewViewController alloc] initWithNibName:@"PreviewViewController" bundle:nil];
     vc.preferredContentSize = CGSizeMake(0, 300);
     return vc;

  }

  - (void)previewingContext:(id <UIViewControllerPreviewing>)previewingContext commitViewController:(UIViewController *)viewControllerToCommit
  {
      // 继续重按进入的页面
      [self.navigationController pushViewController:viewControllerToCommit animated:YES];
  }

Step4: 目标控制器PreViewController中以实现- (NSArray<id<UIPreviewActionItem>> *)previewActionItems也可以不实现则没有ActionItem 如：

  - (NSArray<id<UIPreviewActionItem>> *)previewActionItems
  {

      UIPreviewAction *action1 = [UIPreviewAction actionWithTitle:@"action1"
                                                            style:UIPreviewActionStyleDefault handler:
                                  ^(UIPreviewAction * _Nonnull action, UIViewController * _Nonnull previewViewController)
      {
          NSLog(@"action1 selected.");
      }];

      UIPreviewAction *action2 = [UIPreviewAction actionWithTitle:@"action2"
                                                            style:UIPreviewActionStyleSelected handler:
                                  ^(UIPreviewAction * _Nonnull action, UIViewController * _Nonnull previewViewController)
      {
          NSLog(@"action2 selected.");
      }];
      UIPreviewAction *action3_1 = [UIPreviewAction actionWithTitle:@"action3-1"
                                                              style:UIPreviewActionStyleDefault handler:
                                    ^(UIPreviewAction * _Nonnull action, UIViewController * _Nonnull previewViewController)
      {
          NSLog(@"action3-1 selected.");
      }];
      UIPreviewAction *action3_2 = [UIPreviewAction actionWithTitle:@"action3-2"
                                                              style:UIPreviewActionStyleDefault handler:
                                    ^(UIPreviewAction * _Nonnull action, UIViewController * _Nonnull previewViewController)
      {
          NSLog(@"action3-2 selected.");
      }];
      UIPreviewActionGroup *action3 = [UIPreviewActionGroup actionGroupWithTitle:@"action3" style:UIPreviewActionStyleDestructive actions:@[action3_1, action3_2]];

      return @[action1, action2, action3];

  }

效果如下：

3、Force Properties

UITouch提供了下面两个属性来支付自定义 3D Touch 功能

// Force of the touch, where 1.0 represents the force of an average touch
@property(nonatomic,readonly) CGFloat force NS_AVAILABLE_IOS(9_0);
// Maximum possible force with this input mechanism
@property(nonatomic,readonly) CGFloat maximumPossibleForce NS_AVAILABLE_IOS(9_0);