IOS14 DeviceOrientationEvent立即被拒绝

Question

我正在尝试访问iPhones加速度计。从iOS 13开始，您必须在应用程序中请求权限。我正在使用iOS14，我甚至没有收到请求。它马上就被拒绝了

 if(typeof(DeviceMotionEvent) !== 'undifined' && typeof(DeviceOrientationEvent.requestPermission) === "function"){
// requestAcces()
}

function requestAcces(){
    DeviceOrientationEvent.requestPermission()
        .then(permissionState => {
            text(permissionState,100, 100);  // answer is "denied"
            if (permissionState === 'granted') {
            window.addEventListener('deviceorientation', () => {});
            }
        })
        .catch(console.error);
   }

Answer 1

requestAccess()函数需要由用户的操作触发，例如，作为按钮onclick事件的回调函数。这是一个演示：https://accelerometerdemo.netlify.app

<button onclick="requestAccess()">Get Accelerometer Permissions</button>

function requestAccess() {
    DeviceMotionEvent.requestPermission().then(permissionState => {
        if (permissionState == 'granted') {
            // ...
        }
    }
}