iOS9 3D Touch 使用第二篇

前一篇文章介绍了给图片添加快捷方式，这篇主要介绍应用内，3D Touch的peek和pop功能的实现

• 当前的ViewController实现UIViewControllerPreviewingDelegate，实现代理方法- (UIViewController *)previewingContext:(id)previewingContext viewControllerForLocation:(CGPoint)location

• 注册当前的viewController

/** 注册当前view */
[self registerForPreviewingWithDelegate:self sourceView:self.view];

代码如下：

#import "ViewController.h"
#import "DetailViewController.h"

@interface ViewController ()
{
    UITableView *mainTable;
}

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    self.view.backgroundColor = [UIColor whiteColor];
    self.title = @"首页";
    
    if (self.traitCollection.forceTouchCapability == UIForceTouchCapabilityAvailable)
    {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"您的手机支持3dtouch" message:nil delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
        [alert show];
        
         /** 注册当前view */
        [self registerForPreviewingWithDelegate:self sourceView:self.view];
    }
    else
    {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"很遗憾您的手机不支持3dtouch" message:nil delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
        [alert show];
    }
    
    mainTable = [[UITableView alloc] initWithFrame:self.view.bounds style:UITableViewStyleGrouped];
    mainTable.delegate = self;
    mainTable.dataSource = self;
    [self.view addSubview:mainTable];
    
}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return 10;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSString *cellId = [NSString stringWithFormat:@"%ld--%ld",(long)indexPath.section,(long)indexPath.row];
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellId];
    if (!cell)
    {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellId];
    }
    
    cell.textLabel.text = cellId;
    
    return cell;
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return 45.0f;
}

- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
    return 15.0f;
}

- (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section
{
    return 0.1f;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    [tableView deselectRowAtIndexPath:indexPath animated:YES];
}

#pragma mark -  previewing Delegate
- (UIViewController *)previewingContext:(id)previewingContext viewControllerForLocation:(CGPoint)location
{
     /** 转换坐标 */
    CGPoint p = [mainTable convertPoint:location fromView:self.view];
    
     /** 通过坐标活的当前cell indexPath */
    NSIndexPath *indexPath = [mainTable indexPathForRowAtPoint:p];
    
     /** 获得当前cell */
    UITableViewCell *cell = [mainTable cellForRowAtIndexPath:indexPath];
    
    DetailViewController *detail = [[DetailViewController alloc] init];
//    detail.preferredContentSize = CGSizeMake(0, 120);
    detail.view.frame = self.view.frame;
    
    detail.titleString = cell.textLabel.text;
    
    if (indexPath.row > 6)
    {
        return nil;
    }
    
    return detail;
}

- (void)previewingContext:(id)previewingContext commitViewController:(UIViewController *)viewControllerToCommit
{
    [self showViewController:viewControllerToCommit sender:self];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

• 预览时滑动底部菜单添加，在要展示的ViewController中（本例为DemoViewController）实现 UIViewControllerPreviewingDelegate的协议
  重写方法代理方法- (NSArray> *)previewActionItems;

代码如下：

@interface DetailViewController ()

@end

@implementation DetailViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    self.view.backgroundColor = [UIColor lightGrayColor];
    
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    
    NSLog(@"title  %@",self.titleString);
    
    self.navigationItem.title = self.titleString;
}

底部预览界面选项
-(NSArray> *)previewActionItems
{
    UIPreviewAction *p1 = [UIPreviewAction actionWithTitle:@"选项1" style:UIPreviewActionStyleDefault handler:^(UIPreviewAction * _Nonnull action, UIViewController * _Nonnull previewViewController) {
        NSLog(@"1111111");
        
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"" message:@"111111" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
        [alert show];
    }];
    
    
    UIPreviewAction *p2 = [UIPreviewAction actionWithTitle:@"选项2" style:UIPreviewActionStyleSelected handler:^(UIPreviewAction * _Nonnull action, UIViewController * _Nonnull previewViewController) {
        NSLog(@"2222222222");
    }];
    
    
    UIPreviewAction *p3 = [UIPreviewAction actionWithTitle:@"选项3" style:UIPreviewActionStyleDestructive handler:^(UIPreviewAction * _Nonnull action, UIViewController * _Nonnull previewViewController) {
        NSLog(@"3333333333");
        
    }];
    
    return @[p1,p2,p3];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

通过以上代码，就可实现3D touch peek和pop的效果