对于iOS手机：
苹果公司给出了一个枚举，如下：
typedef NS_ENUM (NSInteger, UIDeviceOrientation) {
UIDeviceOrientationUnknown,
UIDeviceOrientationPortrait, // 竖向，home键向下
UIDeviceOrientationPortraitUpsideDown, // 竖向，home键向上
UIDeviceOrientationLandscapeLeft, // 横向，home键向右
UIDeviceOrientationLandscapeRight, // 横向，home键向左
UIDeviceOrientationFaceUp, // 屏幕平放，向上
UIDeviceOrientationFaceDown // 屏幕平放，向下
}
typedef NS_ENUM(NSInteger, UIInterfaceOrientation) {
UIInterfaceOrientationUnknown = UIDeviceOrientationUnknown,
UIInterfaceOrientationPortrait = UIDeviceOrientationPortrait,
UIInterfaceOrientationPortraitUpsideDown = UIDeviceOrientationPortraitUpsideDown,
UIInterfaceOrientationLandscapeLeft = UIDeviceOrientationLandscapeRight,
UIInterfaceOrientationLandscapeRight = UIDeviceOrientationLandscapeLeft
}
2、对于获取手机屏幕
（1）
[[ UIDevice currentDevice ] beginGeneratingDeviceOrientationNotifications ];
dispatch_async ( dispatch_get_main_queue (), ^{
NSLog ( @"=========%zd" ,[[ UIDevice currentDevice ] orientation ]);
});
[[ UIDevice currentDevice ] endGeneratingDeviceOrientationNotifications ];
（2）
UIInterfaceOrientation orientation = [ UIApplication sharedApplication ]. statusBarOrientation ;
3、对于当前手机是不是横屏或者竖屏的判断
（1）判断是否是竖屏
static inline BOOL UIDeviceOrientationIsPortrait( UIDeviceOrientation orientation) {
return ((orientation) == UIDeviceOrientationPortrait || (orientation) == UIDeviceOrientationPortraitUpsideDown );
}
（2）判断是否是横屏
static inline BOOL UIDeviceOrientationIsLandscape( UIDeviceOrientation orientation) {
return ((orientation) == UIDeviceOrientationLandscapeLeft || (orientation) == UIDeviceOrientationLandscapeRight );
}
对于Android手机：
public class SimpleOrientationActivity extends Activity {
OrientationEventListener mOrientationListener;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mOrientationListener = new OrientationEventListener(this,
SensorManager.SENSOR_DELAY_NORMAL) {
@Override
public void onOrientationChanged(int orientation) {
Log.v(DEBUG_TAG,
"Orientation changed to " + orientation);
}
};
if (mOrientationListener.canDetectOrientation()) {
Log.v(DEBUG_TAG, "Can detect orientation");
mOrientationListener.enable();
} else {
Log.v(DEBUG_TAG, "Cannot detect orientation");
mOrientationListener.disable();
}
}
@Override
protected void onDestroy() {
super.onDestroy();
mOrientationListener.disable();
}
}
判断手机方向的具体判断代码如下：
if (OrientationEventListener.ORIENTATION_UNKNOWN == orientation) {
return; //手机平放时，检测不到有效的角度
}
// 我们只关心 0， 90， 180 ，270 测试发现，很多设备返回的数据是很混乱的，但是这四个度数比较稳定
if((0 == orientation % 90) && (orientation < 360) && (orientation >= 0)) {
//只检测是否有四个角度的改变
if (orientation > 350 || orientation < 10) { //0度
orientation = 0;
} else if (orientation > 80 && orientation < 100) { //90度
orientation = 90;
} else if (orientation > 170 && orientation < 190) { //180度
orientation = 180;
} else if (orientation > 260 && orientation < 280) { //270度
orientation = 270;
} else {
return;
}
Log.i("MyOrientationDetector ", "onOrientationChanged:" + orientation);
}
对于 Flutter：
使用 native_device_orientation 插件完成相同的检测功能。