iOS- 指压即达，如何集成iOS9里的3D Touch

1.前言　　

随着6S的到来，3DTouch被各大热门APP迅速普及，博主亲自体验后，发现使用便捷性大幅提高，随后自己照着文档，写了个Demo出来，分享给大家，希望能对有需要的朋友提供有一些帮助。

2.如何使用3D Touch？　　

2.1.主界面重按APP图标，弹出Touch菜单　　

在AppleDelegate文件中的程序入口处配置：

didFinishLaunchingWithOptions

    //给App图标添加3D Touch菜单
    //拍照

    //菜单图标
    UIApplicationShortcutIcon *iconCamera = [UIApplicationShortcutIcon iconWithType:UIApplicationShortcutIconTypeAdd];
    //菜单文字
    UIMutableApplicationShortcutItem *itemCamera = [[UIMutableApplicationShortcutItem alloc] initWithType:@"1" localizedTitle:@"拍照"];
    //绑定信息到指定菜单
    itemCamera.icon = iconCamera;

    //相册
    //菜单图标
    UIApplicationShortcutIcon *iconPhotoLibrary = [UIApplicationShortcutIcon iconWithType:UIApplicationShortcutIconTypeSearch];
    //菜单文字
    UIMutableApplicationShortcutItem *itemPhotoLibrary = [[UIMutableApplicationShortcutItem alloc] initWithType:@"2" localizedTitle:@"相册"];
    //绑定信息到指定菜单
    itemPhotoLibrary.icon = iconPhotoLibrary;
    //绑定到App icon
    application.shortcutItems = @[itemCamera,itemPhotoLibrary];

弹出菜单，我们需要让用户点击后跳转指定页面

这里我们会用到AppDelegate里新增加的一个方法

- (void)application:(UIApplication *)application performActionForShortcutItem:(nonnull UIApplicationShortcutItem *)shortcutItem completionHandler:(nonnull void (^)(BOOL))completionHandler;

让后我们需要在这个方法里做跳转的操作

    //照相type
    if ([shortcutItem.type isEqualToString:@"1"]) {

        UIImagePickerController *picker = [[UIImagePickerController alloc] init];//初始化
        picker.allowsEditing = YES;//设置可编辑
        picker.sourceType = UIImagePickerControllerSourceTypeCamera;
        [self.window.rootViewController presentViewController:picker animated:YES completion:nil];//进入照相界面

    }
    //相册type
    if ([shortcutItem.type isEqualToString:@"2"]) {

        UIImagePickerController *picker = [[UIImagePickerController alloc] init];//初始化
        picker.allowsEditing = YES;//设置可编辑
        picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
        [self.window.rootViewController presentViewController:picker animated:YES completion:nil];//进入图片库

点击后分别会进入相机和相册

2.2. 3DTouch轻按预览功能，预览时底部菜单的添加　　

首先我们要把轻按预览和长按手势区分开来，这里要在初始化时做一个基本的检测。

nterface ViewController () <UIViewControllerPreviewingDelegate>
{
    UILongPressGestureRecognizer *_longPress;
}
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    UILongPressGestureRecognizer *longPressGr = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressToDo)];
    _longPress = longPressGr;
}

//检测页面是否处于3DTouch
- (void)check3DTouch{

    if (self.traitCollection.forceTouchCapability == UIForceTouchCapabilityAvailable) {

        [self registerForPreviewingWithDelegate:self sourceView:self.view];
        NSLog(@"3D Touch 开启");
        //长按停止
        _longPress.enabled = NO;

    }else{
        _longPress.enabled = YES;
    }

}

- (void)viewWillAppear:(BOOL)animated{

    [self check3DTouch];

}

然后我们需要实现 UIViewControllerPreviewingDelegate的协议

@interface ViewController () <UIViewControllerPreviewingDelegate>

//然后实现代理方法
- (UIViewController *)previewingContext:(id<UIViewControllerPreviewing>)previewingContext viewControllerForLocation:(CGPoint)location;

#pragma mark >> 3D touch 代理方法
//轻按进入浮动预览页面
- (UIViewController *)previewingContext:(id<UIViewControllerPreviewing>)previewingContext viewControllerForLocation:(CGPoint)location{

    //注意这里我因为测试，没做具体的位置处理，如果需要定位到具体的图片Cell位置的话，可以用location通过tableView的convertPoint来取到指定Cell

    ASPreviewViewController *vc = [[ASPreviewViewController alloc] init];
    vc.view.frame = self.view.frame;
    UIImageView *er = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"123.png"]];
    vc.view = er;
    return vc;

}

完成后可以实现基本的预览效果:

最后我们加上一个

预览时下滑底部菜单的添加

在我们刚刚创建的预览控制器ASPreviewViewController里实现 UIViewControllerPreviewingDelegate的协议

然后重写它的代理方法

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

//预览页面 底部Action Items
- (NSArray<id<UIPreviewActionItem>> *)previewActionItems{

    UIPreviewAction *p1 =[UIPreviewAction actionWithTitle:@"分享" style:UIPreviewActionStyleDefault handler:^(UIPreviewAction * _Nonnull action, UIViewController * _Nonnull previewViewController) {
        NSLog(@"点击了分享");
    }];

    UIPreviewAction *p2 =[UIPreviewAction actionWithTitle:@"收藏" style:UIPreviewActionStyleDefault handler:^(UIPreviewAction * _Nonnull action, UIViewController * _Nonnull previewViewController) {
        NSLog(@"点击了收藏");
    }];

    NSArray *actions = @[p1,p2];
    return actions;
}

作者： 清澈Saup
出处：http://www.cnblogs.com/qingche/
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