Question

我的应用程序在两个方向（纵向和横向）中都有效，但其中一个屏幕在纵向模式下被锁定。但我必须在该特定屏幕的Rotation变量中设置一个值。但我没有找到方向。所以我想找到方向。我使用以下代码在纵向模式下锁定我的屏幕，它可以正常工作。

- (UIInterfaceOrientationMask) supportedInterfaceOrientations {
    [super supportedInterfaceOrientations];
    return UIInterfaceOrientationMaskPortrait;
}

我使用以下方法检测方向，但不会调用此方法。

- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation
{
    UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation];
    if (orientation == UIInterfaceOrientationPortrait || orientation == UIInterfaceOrientationPortraitUpsideDown)
    {
        NSLog(@"UIInterfaceOrientationPortrait");
    }
    else
    {
        NSLog(@"UIInterfaceOrientationland");

    }
}

Answer 1

如果屏幕在纵向模式下被锁定，您可以检测方向。简单的方法是“CoreMotion”。代码段如下所示。

1-）首先，您应该将CoreMotion freamework添加到Build Settings

2-）导入CoreMotion freamework

#import <CoreMotion/CoreMotion.h>

3-）添加属性如下。

    @interface BaseGeneralViewController (){
    UIInterfaceOrientation orientationLast, orientationAfterProcess;
    CMMotionManager *motionManager;
    UIInterfaceOrientation orientationNew;

}

4-）我们创建了初始化方法

 - (void)initializeMotionManager{
    motionManager = [[CMMotionManager alloc] init];
    motionManager.accelerometerUpdateInterval = .2;
    motionManager.gyroUpdateInterval = .2;

    [motionManager startAccelerometerUpdatesToQueue:[NSOperationQueue currentQueue]
                                        withHandler:^(CMAccelerometerData  *accelerometerData, NSError *error) {
                                            if (!error) {
                                                [self outputAccelerationData:accelerometerData.acceleration];
                                            }
                                            else{
                                                NSLog(@"%@", error);
                                            }
                                        }];
}

5-）声明outputAccelerationData方法

    - (void)outputAccelerationData:(CMAcceleration)acceleration{

    if (acceleration.x >= 0.75 && orientationLast != UIInterfaceOrientationLandscapeLeft) {
        orientationNew = UIInterfaceOrientationLandscapeLeft;
        [self callQRCodePayment:UIDeviceOrientationLandscapeRight];
    }
    else if (acceleration.x <= -0.75  && orientationLast != UIInterfaceOrientationLandscapeRight) {
        orientationNew = UIInterfaceOrientationLandscapeRight;
        [self callQRCodePayment:UIDeviceOrientationLandscapeLeft];
    }
    else if (acceleration.y <= -0.75) {
        //orientationNew = UIInterfaceOrientationPortrait;
        //NSLog(@"Portrait");
    }
    else if (acceleration.y >= 0.75) {
        //orientationNew = UIInterfaceOrientationPortraitUpsideDown;
    }
    else {
        // Consider same as last time
        return;
    }

    if (orientationNew == orientationLast)
        return;

    orientationLast = orientationNew;
}

6-）在viewDidload中调用initialize方法

    - (void)viewDidLoad
{
    [super viewDidLoad];
    [self initializeMotionManager];
}

你可以看到帖子change Oriantation

的详细信息

Answer 2

这里有检测方向UIDeviceOrientationIsLandscape和UIDeviceOrientationIsPortrait

的方法

if (UIDeviceOrientationIsLandscape([UIDevice currentDevice].orientation))
{
     // code here for landscape orientation      
}

// And

if (UIDeviceOrientationIsPortrait([UIDevice currentDevice].orientation))
 {
    // code here for Portrait orientation       
 }

如果屏幕在纵向模式下被锁定，如何检测方向？

2 个答案: