当有人摇晃iPhone时,我想做出反应。我并不特别在意他们是如何摇晃它的,只在意它在一瞬间被使劲地挥舞着。有人知道怎么检测吗?


当前回答

这是你需要的基本委托代码:

#define kAccelerationThreshold      2.2

#pragma mark -
#pragma mark UIAccelerometerDelegate Methods
    - (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration 
    {   
        if (fabsf(acceleration.x) > kAccelerationThreshold || fabsf(acceleration.y) > kAccelerationThreshold || fabsf(acceleration.z) > kAccelerationThreshold) 
            [self myShakeMethodGoesHere];   
    }

也在接口中的适当代码中设置。即:

@interface MyViewController: UIViewController <UIPickerViewDelegate, UIPickerViewDataSource, UIAccelerometerDelegate>

其他回答

为了在整个应用范围内启用这个功能,我在UIWindow上创建了一个类别:

@implementation UIWindow (Utils)

- (BOOL)canBecomeFirstResponder
{
    return YES;
}

- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event
{
    if (motion == UIEventSubtypeMotionShake) {
        // Do whatever you want here...
    }
}

@end

在ViewController中添加以下方法。M文件,它的工作正常

    -(BOOL) canBecomeFirstResponder
    {
         /* Here, We want our view (not viewcontroller) as first responder 
         to receive shake event message  */

         return YES;
    }

    -(void) motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event
    {
            if(event.subtype==UIEventSubtypeMotionShake)
            {
                    // Code at shake event

                    UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"Motion" message:@"Phone Vibrate"delegate:self cancelButtonTitle:@"OK" otherButtonTitles: nil];
                    [alert show];
                    [alert release];

                    [self.view setBackgroundColor:[UIColor redColor]];
             }
    }
    - (void)viewDidAppear:(BOOL)animated
    {
             [super viewDidAppear:animated];
             [self becomeFirstResponder];  // View as first responder 
     }

你需要通过accelerometer:didAccelerate: method检查加速度计,这是UIAccelerometerDelegate协议的一部分,检查这些值是否超过了震动所需的移动量的阈值。

在AppController底部的accelerometer:didAccelerate:方法中有一些不错的示例代码。m在GLPaint例子中,这个例子可以在iPhone开发者网站上找到。

首先,我知道这是一个老帖子,但它仍然是相关的,我发现投票最高的两个答案并没有尽早检测到震动。下面是如何做到这一点:

将CoreMotion链接到目标构建阶段的项目: 在你的ViewController中: - (BOOL)canBecomeFirstResponder { 返回YES; } - (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event { if(运动== UIEventSubtypeMotionShake) { //检测到震动。 } }

最简单的解决方案是为你的应用程序派生一个新的根窗口:

@implementation OMGWindow : UIWindow

- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event {
    if (event.type == UIEventTypeMotion && motion == UIEventSubtypeMotionShake) {
        // via notification or something   
    }
}
@end

然后在你的应用委托中:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    self.window = [[OMGWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
    //…
}

如果你使用的是故事板,这可能会更棘手,我不知道你在应用委托中需要精确的代码。