iOS 3D Touch

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:reusedId];
    if (!cell) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:reusedId];
    }
    cell.contentView.backgroundColor = [UIColor whiteColor];
    NSString *str = [NSString stringWithFormat:@"row [%@]", self.arrData[indexPath.row]];
    cell.textLabel.text = str;
    
    //注册3D Touch
    //只有在6s及其以上的设备才支持3D Touch,我们可以通过UITraitCollection这个类的UITraitEnvironment协议属性来判断
    /**
     UITraitCollection是UIViewController所遵守的其中一个协议，不仅包含了UI界面环境特征，而且包含了3D Touch的特征描述。
     从iOS9开始，我们可以通过这个类来判断运行程序对应的设备是否支持3D Touch功能。
     UIForceTouchCapabilityUnknown = 0,     //未知
     UIForceTouchCapabilityUnavailable = 1, //不可用
     UIForceTouchCapabilityAvailable = 2    //可用
     */
    if ([self respondsToSelector:@selector(traitCollection)]) {
        
        if ([self.traitCollection respondsToSelector:@selector(forceTouchCapability)]) {
            
            if (self.traitCollection.forceTouchCapability == UIForceTouchCapabilityAvailable) {
                
                [self registerForPreviewingWithDelegate:(id)self sourceView:cell];
                
            }
        }
    }
    
    return cell;
}

#pragma mark - tableView delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

    UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];

    cell.selected = NO;
    
    NSString *str = [NSString stringWithFormat:@"%@", self.arrData[indexPath.row]];
    
    DMPresentationViewController *presentationVC = [[DMPresentationViewController alloc] init];
    presentationVC.strInfo = str;
    
    [self.navigationController pushViewController:presentationVC animated:YES];
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {

    return 88.0;
}


#pragma mark - UIViewControllerPreviewingDelegate
#pragma mark peek(preview)
- (nullable UIViewController *)previewingContext:(id )previewingContext viewControllerForLocation:(CGPoint)location NS_AVAILABLE_IOS(9_0) {

    NSIndexPath *indexPath = [self.tableView indexPathForCell:(UITableViewCell *)[previewingContext sourceView]];
    NSString *str = [NSString stringWithFormat:@"%@",self.arrData[indexPath.row]];
    
    //创建要预览的控制器
    DMPresentationViewController *presentationVC = [[DMPresentationViewController alloc] init];
    presentationVC.arrData = (NSMutableArray *)self.arrData;
    presentationVC.index = indexPath.row;
    presentationVC.strInfo = str;
    
    //指定当前上下文视图Rect
    CGRect rect = CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, 300);
    previewingContext.sourceRect = rect;

    return presentationVC;
}

#pragma mark pop(push)
- (void)previewingContext:(id )previewingContext commitViewController:(UIViewController *)viewControllerToCommit NS_AVAILABLE_IOS(9_0) {

    [self showViewController:viewControllerToCommit sender:self];
}

https://github.com/DamonMok/DM3D-Touch-Demo

https://www.jianshu.com/p/d472c6350a1a