Ios 基于加速度计的旋转地图视图

我正在尝试使用

CoreMotion

围绕

userLocation

点旋转我的

MapView

。我成功地旋转了视图，但有一个问题：当

地图视图旋转时，背景白色开始显示。如图所示（忽略下面的红色框）：
我用来完成此操作的代码是：

- (void)viewDidLoad {
locationManager = [[CLLocationManager alloc] init];
    _mapView.delegate = self;
    locationManager.delegate = self;
[locationManager requestWhenInUseAuthorization];

    [locationManager startUpdatingLocation];

    _mapView.showsUserLocation = YES;
    [_mapView setMapType:MKMapTypeStandard];
    [_mapView setZoomEnabled:YES];
    [_mapView setScrollEnabled:YES];

 locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation;
    locationManager.distanceFilter = kCLDistanceFilterNone;
    locationManager.headingFilter = 1;
    [locationManager startUpdatingHeading];

    motionManager = [[CMMotionManager alloc] init];
    motionManager.accelerometerUpdateInterval = 0.01;
    motionManager.gyroUpdateInterval = 0.01;

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

}

标题呢

- (void)locationManager:(CLLocationManager *)manager didUpdateHeading:(CLHeading *)newHeading {

    //self.lblGrados.text = [NSString stringWithFormat:@"%.0f°", newHeading.magneticHeading];

    // Convert Degree to Radian and move the needle
    float newRad =  -newHeading.trueHeading * M_PI / 180.0f;

    [UIView animateWithDuration:0.6 delay:0 options:UIViewAnimationOptionCurveEaseInOut animations:^{
        self.mapView.transform = CGAffineTransformMakeRotation(newRad);
    } completion:nil];
}

此方法调用以下方法：

- (void)outputAccelertionData:(CMAcceleration)acceleration{
    //UIInterfaceOrientation orientationNew;

    // Get the current device angle
    float xx = -acceleration.x;
    float yy = acceleration.y;
    float angle = atan2(yy, xx);
}

anf最后：

- (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation
{
    MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(userLocation.coordinate, 800.0f, 200.0f);
    //[self.mapView setRegion:[self.mapView regionThatFits:region] animated:YES];

    [self.mapView setCenterCoordinate:userLocation.location.coordinate animated:YES];
    [self.mapView setRegion:region animated:YES];
}
- (NSString *)deviceLocation {
    return [NSString stringWithFormat:@"latitude: %f longitude: %f", locationManager.location.coordinate.latitude, locationManager.location.coordinate.longitude];
}
- (NSString *)deviceLat {
    return [NSString stringWithFormat:@"%f", locationManager.location.coordinate.latitude];
}
- (NSString *)deviceLon {
    return [NSString stringWithFormat:@"%f", locationManager.location.coordinate.longitude];
}
- (NSString *)deviceAlt {
    return [NSString stringWithFormat:@"%f", locationManager.location.altitude];
}

那么，我错过了什么？就我所知，它与self.mapView.transform=CGAffineTransformMakeRotation（newRad）有关但我不知道要将其更改为什么。
请尝试以下代码

[self.mapView setUserTrackingMode:MKUserTrackingModeFollowWithHeading animated:true];

如果你想跟随标题，可以使用self.mapView.setUserTrackingMode（MKUserTrackingMode.FollowWithHeading，动画：true）。@sanman是的，这正是我需要的。。。这行代码运行得很好，但是如果你想快速移动，它会导致应用程序崩溃，并说
EXE\u BAD\u ACCESS
有什么办法吗？我这样做了
[UIView animateWithDuration:0.6延迟：0选项：UIView AnimationOptionCurveeAseInOut动画：^{//self.mapView.transform=CGAffineTransformMakeRotation（newRad）；[self.mapView设置用户跟踪模式：MKUserTrackingModeFollowWithHeading animated:true]；}完成：nil]
@sanman I评论
[self.mapView setCenterCoordinate:userLocation.location.coordinate:YES]在
didUpdateUserLocation
中，它不再崩溃了。：）非常感谢您的帮助。您可以在viewDidLoad中添加该行，而不是该块。我不知道它为什么会崩溃。很高兴它为您解决了：）它一直在崩溃应用程序，在描述中没有显示任何错误，但有时它会显示
\u NSCFNumber isPitched
，有时
EXE\u BAD\u ACCESS
我不知道失败的原因崩溃，但希望这会有所帮助：）