iOS 指压即达集成iOS9里的3D Touch的方法

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];
}

@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;
}

- (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;
}								 
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