实现3DTouch功能iOS

目前，iphone6s以上的机型都有3DTouch功能，对于这个功能的开发应用，一般分两类：一种是用力按下app的图片icon，会弹出选项菜单，就像电脑上的右键。一种是在应用内的界面上用力按下，弹出的预览界面。

1.icon按下效果实现：

（1）AppDelegate文件里的代码添加：

在

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

方法里调用

[self setup3DTouch:application];

代码如下：

- (void)setup3DTouch:(UIApplication *)application
{
    /**
     type 该item 唯一标识符
     localizedTitle ：标题
     localizedSubtitle：副标题
     icon：icon图标 可以使用系统类型 也可以使用自定义的图片
     userInfo：用户信息字典 自定义参数，完成具体功能需求
     */
    //    UIApplicationShortcutIcon *icon1 = [UIApplicationShortcutIcon iconWithTemplateImageName:@"标签.png"];
    UIApplicationShortcutIcon *cameraIcon = [UIApplicationShortcutIcon iconWithType:UIApplicationShortcutIconTypeCompose];
    UIApplicationShortcutItem *cameraItem = [[UIApplicationShortcutItem alloc] initWithType:@"ONE" localizedTitle:@"拍照" localizedSubtitle:@"" icon:cameraIcon userInfo:nil];
    
    UIApplicationShortcutIcon *shareIcon = [UIApplicationShortcutIcon iconWithType:UIApplicationShortcutIconTypeShare];
    UIApplicationShortcutItem *shareItem = [[UIApplicationShortcutItem alloc] initWithType:@"TWO" localizedTitle:@"分享" localizedSubtitle:@"" icon:shareIcon userInfo:nil];
    /** 将items 添加到app图标 */
    application.shortcutItems = @[cameraItem,shareItem];
}

点击代理方法：

// 3DTouch点击的回调方法
-(void)application:(UIApplication *)application performActionForShortcutItem:(UIApplicationShortcutItem *)shortcutItem completionHandler:(void (^)(BOOL))completionHandler
{
    UINavigationController *nav = (UINavigationController *)self.window.rootViewController;
    if([shortcutItem.type isEqualToString:@"ONE"]){
//        UIViewController *vc = [[UIViewController alloc] init];
//        vc.title = @"第一个";
//        vc.view.backgroundColor = [UIColor redColor];
//        [nav pushViewController:vc animated:YES];
    }else if ([shortcutItem.type isEqualToString:@"TWO"]){
//        UIViewController *vc = [[UIViewController alloc] init];
//        vc.title = @"第二个";
//        vc.view.backgroundColor = [UIColor greenColor];
//        [nav pushViewController:vc animated:YES];
    }
}

(2)通过plist文件设置：

UIApplicationShortcutItemUserInfo信息  
UIApplicationShortcutItemIconFile图标名称  
UIApplicationShortcutItemIconType图标类型  
UIApplicationShortcutItemTitle标题  
UIApplicationShortcutItemSubTitle副标题

然后再调用代理方法，实现点击方法。

2.应用内UI界面用力按下产生的3DTouch效果

比如用力按下某个cell，弹出预览的小视图，同时上滑底部出现若干个选项（Peek功能）

第一注册需要实现Touch效果的View，判断下设备系统支不支持，不然会崩溃。

把当前的cell注册绑定，然后试图界面实现UIViewControllerPreviewingDelegate代理：

#pragma mark - UIViewControllerPreviewingDelegate  
-(UIViewController *)previewingContext:(id<UIViewControllerPreviewing>)previewingContext viewControllerForLocation:(CGPoint)location  
{  
    NSIndexPath *index = [self.tableView indexPathForCell:(UITableViewCell *)[previewingContext sourceView]];  
    NewsListModel *model = self.lists[index.row];  
      
    NewsDetailsViewController *showVC = [[NewsDetailsViewController alloc]init];  
    showVC.newsID = model.news_id;  
      
    CGRect rect = CGRectMake(0, 0,  previewingContext.sourceView.ab_width, previewingContext.sourceView.ab_height);  
    previewingContext.sourceRect = rect;  
      
    return showVC;  
}

到这里就能有弹出预览界面效果了，如果还是实现下面的几个选项功能，需要在你预览界面里面实现一个方法：

- (NSArray<id<UIPreviewActionItem>> *)previewActionItems  
{  
    UIPreviewAction *action0 = [UIPreviewAction actionWithTitle:@"action0" style:UIPreviewActionStyleDefault handler:^(UIPreviewAction * _Nonnull action, UIViewController * _Nonnull previewViewController) {  
        NSLog(@"%s, line = %d, action0 = %@, previewViewController = %@", __FUNCTION__, __LINE__, action, previewViewController);  
          
    }];  
      
    UIPreviewAction *action1 = [UIPreviewAction actionWithTitle:@"action1" style:UIPreviewActionStyleDestructive handler:^(UIPreviewAction * _Nonnull action, UIViewController * _Nonnull previewViewController) {  
        NSLog(@"%s, line = %d, action1 = %@, previewViewController = %@", __FUNCTION__, __LINE__, action, previewViewController);  
    }];  
      
    UIPreviewAction *action2 = [UIPreviewAction actionWithTitle:@"action2" style:UIPreviewActionStyleSelected handler:^(UIPreviewAction * _Nonnull action, UIViewController * _Nonnull previewViewController) {  
        NSLog(@"%s, line = %d, action2 = %@, previewViewController = %@", __FUNCTION__, __LINE__, action, previewViewController);  
    }];  
    UIPreviewAction *action3 = [UIPreviewAction actionWithTitle:@"action3" style:UIPreviewActionStyleSelected handler:^(UIPreviewAction * _Nonnull action, UIViewController * _Nonnull previewViewController) {  
        NSLog(@"%s, line = %d, action2 = %@, previewViewController = %@", __FUNCTION__, __LINE__, action, previewViewController);  
    }];  
      
    //该按钮可以是一个组,点击该组时,跳到组里面的按钮.  
    UIPreviewActionGroup *actionGroup = [UIPreviewActionGroup actionGroupWithTitle:@"actionGroup" style:UIPreviewActionStyleSelected actions:@[action2, action3]];  
    //直接返回数组.  
    return  @[action0,action1,actionGroup];  
}

在第1个效果的基础上，再继续用力按下去，就会push预览界面了。（pop功能）

再实现一个代理方法：

#pragma mark - UIViewControllerPreviewingDelegate  
-(void)previewingContext:(id<UIViewControllerPreviewing>)previewingContext commitViewController:(UIViewController *)viewControllerToCommit  
{  
    [self showViewController:viewControllerToCommit sender:self];  
}

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