Objective C 中的 iOS 3D Touch

Question

任何人都知道我们如何在objective C 中实现3d touch 功能？我已经检查了应用程序文档，但没有示例与目标 C 代码相关。

任何示例代码或示例，如何实现？提前致谢。

Answer 1

我这样做的方法是使用我提供的DFContinuousForceTouchGestureRecognizer。这是一个手势识别器扩展，可检测强制触摸并与其他手势识别器一起工作。

DFContinuousForceTouchGestureRecognizer 提供有关压力变化的持续更新，因此您可以做一些很好的事情，例如在用户改变压力时增加视图，而不是仅仅触发单个事件。如果您只想要一个事件，您可以忽略 DFContinuousForceTouchDelegate 中的所有内容，除了 - (void) forceTouchRecognized 回调。

https://github.com/foggzilla/DFContinuousForceTouchGestureRecognizer

您可以下载这个并在支持力压的设备上运行示例应用程序，看看感觉如何。

在你的 UIViewController 实现中：

- (void) viewDidLoad {
    [super viewDidLoad];
    _forceTouchRecognizer = [[DFContinuousForceTouchGestureRecognizer alloc] init];
    _forceTouchRecognizer.forceTouchDelegate = self;

    [self.imageView addGestureRecognizer:_forceTouchRecognizer];
}

实现强制触摸的委托协议：

#pragma DFContinuousForceTouchDelegate

- (void) forceTouchRecognized:(DFContinuousForceTouchGestureRecognizer*)recognizer {
    self.imageView.transform = CGAffineTransformIdentity;
    [self.imageView setNeedsDisplay];
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.1f * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        [[[UIAlertView alloc] initWithTitle:@"Force Touch" message:@"YEAH!!" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil] show];
    });
}
- (void) forceTouchRecognizer:(DFContinuousForceTouchGestureRecognizer*)recognizer didStartWithForce:(CGFloat)force maxForce:(CGFloat)maxForce {
    CGFloat transformDelta = 1.0f + ((force/maxForce) / 3.0f);
    self.imageView.transform = CGAffineTransformMakeScale(transformDelta, transformDelta);
    [self.imageView setNeedsDisplay];
}

- (void) forceTouchRecognizer:(DFContinuousForceTouchGestureRecognizer*)recognizer didMoveWithForce:(CGFloat)force maxForce:(CGFloat)maxForce {
    CGFloat transformDelta = 1.0f + ((force/maxForce) / 3.0f);
    self.imageView.transform = CGAffineTransformMakeScale(transformDelta, transformDelta);
    [self.imageView setNeedsDisplay];
}

- (void) forceTouchRecognizer:(DFContinuousForceTouchGestureRecognizer*)recognizer didCancelWithForce:(CGFloat)force maxForce:(CGFloat)maxForce  {
    self.imageView.transform = CGAffineTransformIdentity;
    [self.imageView setNeedsDisplay];
}

- (void) forceTouchRecognizer:(DFContinuousForceTouchGestureRecognizer*)recognizer didEndWithForce:(CGFloat)force maxForce:(CGFloat)maxForce  {
    self.imageView.transform = CGAffineTransformIdentity;
    [self.imageView setNeedsDisplay];
}

- (void) forceTouchDidTimeout:(DFContinuousForceTouchGestureRecognizer*)recognizer {
    self.imageView.transform = CGAffineTransformIdentity;
    [self.imageView setNeedsDisplay];
}

请注意，这仅在支持强制触摸的设备上有用。

此外，如果您在 iOS8 或更低版本上运行，则不应将 UIContinuousForceTouchGestureRecognizer 添加到视图中，因为它使用 UITouch 上的新 force 属性，仅在 iOS9 中可用。

如果你在 iOS8 上添加它会崩溃，所以如果你支持 iOS9 之前的版本，请根据你运行的 iOS 版本有条件地添加这个识别器。

Answer 2

这是一个改编自 github 上 yeungkaho 示例的示例

-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    [self handleTouches:touches];
}
-(void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    [self handleTouches:touches];
}
-(void)touchesCancelled:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    [self setForcePercentage:0];
}
-(void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    [self setForcePercentage:0];
}
-(void)handleTouches:(NSSet<UITouch *> *)touches{

    for (UITouch *touch in touches) {
        CGFloat force = touch.force;
        CGFloat percentage = force/touch.maximumPossibleForce;
        [self setForcePercentage:percentage];
        break;
    }
}

-(void)setForcePercentage:(CGFloat)percentage{

    NSLog(@"LEVEL = %f",percentage*100);
}

Answer 3

我正在分享按应用图标填充列表中的 4 项的源代码

第 1 步：- 在 appDelegate.m 中导入类

导入 sys/utsname.h

第 2 步：-

#pragma MARK for Get Machine Name

-  (NSString *) machineName {
    struct utsname systemInfo;
    uname(&systemInfo);
    return [NSString stringWithCString:systemInfo.machine encoding:NSUTF8StringEncoding];
}

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

    if([[self machineName] isEqualToString:@"iPhone8,2"]|| [[self machineName] isEqualToString:@"iPhone8,1"]) {
        [self addEventsFor3DTouchEvents];
    }
    return YES;
}

为三个 D Touch 事件添加动作的 pragma MARK

- (void) addEventsFor3DTouchEvents {
    if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 9.0) {
        UIApplicationShortcutItem *item1 = [[UIApplicationShortcutItem alloc] initWithType:@"dynamic1" localizedTitle:TITLE_NAME_1 localizedSubtitle:@"" icon:[UIApplicationShortcutIcon iconWithTemplateImageName:TITLE_IMAGE_NAME_1] userInfo:nil];

        UIApplicationShortcutItem *item2 = [[UIApplicationShortcutItem alloc] initWithType:@"dynamic1" localizedTitle:TITLE_NAME_2 localizedSubtitle:@"" icon:[UIApplicationShortcutIcon iconWithTemplateImageName:TITLE_IMAGE_NAME_2] userInfo:nil];

        UIApplicationShortcutItem *item3 = [[UIApplicationShortcutItem alloc] initWithType:@"dynamic1" localizedTitle:TITLE_NAME_3 localizedSubtitle:@"" icon:[UIApplicationShortcutIcon iconWithTemplateImageName:TITLE_IMAGE_NAME_3] userInfo:nil];

        UIApplicationShortcutItem *item4 = [[UIApplicationShortcutItem alloc] initWithType:@"dynamic1" localizedTitle:TITLE_NAME_4 localizedSubtitle:@"" icon:[UIApplicationShortcutIcon iconWithTemplateImageName:TITLE_IMAGE_NAME_4] userInfo:nil];

        [[UIApplication sharedApplication] setShortcutItems: @[ item1, item2, item3, item4 ]];
    }
}


#pragma mark - 3DTouch Delegate Methods

- (void)application:(UIApplication *)application performActionForShortcutItem:(UIApplicationShortcutItem *)shortcutItem completionHandler:(void (^)(BOOL))completionHandler {
    [self moveThrough3DTouch:shortcutItem];
}

#pragma MARK for Handling Action for Three D Touch Events

- (void)moveThrough3DTouch:(UIApplicationShortcutItem *)temp {

    if ([temp.localizedTitle isEqualToString:TITLE_NAME_1])  {

            [self.tabBarController setSelectedIndex:0];
    } else if([temp.localizedTitle isEqualToString:TITLE_NAME_2]) {

            [self.tabBarController setSelectedIndex:1];
    } else if([temp.localizedTitle isEqualToString:TITLE_NAME_3]) {

            [self.tabBarController setSelectedIndex:2];
    } else if([temp.localizedTitle isEqualToString:TITLE_NAME_4]) {

            [self.tabBarController setSelectedIndex:3];
    }
}

**我在我的应用程序中使用标签栏控制器，如果想在视图控制中移动

- (void) moveToControllerScene {
        UIStoryboard *storyboard              = [UIStoryboard storyboardWithName:STORY_BOARD_IDENTIFIER bundle:nil];
        YOUR_CONTROLLER_OBJECT *obj           = [storyboard instantiateViewControllerWithIdentifier:@"YOUR_CONTROLLER_OBJECT"];
        [navController pushViewController:obj animated:YES];
}