使用指南针方向旋转MapView [英] Rotate MapView using Compass orientation

问题描述

是否可以嵌入 MKMapView 旋转以始终面向iPhone面向的方向？基本上我想模仿我自己的应用程序上的地图应用程序旋转功能。

我看到iPhone SDK不公开的功能。但是，我想知道是否可以使用 CGAffineTransformMakeRotate 旋转整个视图。它会影响点击和缩放吗？有更好的方法吗？

解决方案

要旋转mapView但不是注释，你可以使用下面的代码来补偿地图旋转。

   - （void）locationManager：（CLLocationManager *）manager 
 didUpdateHeading：（CLHeading *）newHeading 
 {
 double rotation = newHeading.magneticHeading * 3.14159 / 180; 
 CGPoint anchorPoint = CGPointMake（0，-23）; //你的pin的锚点
 
 [mapView setTransform：CGAffineTransformMakeRotation（-rotation）]; 
 
 [[mapView annotations] enumerateObjectsUsingBlock：^（id obj，NSUInteger idx，BOOL * stop）{
 MKAnnotationView * view = [mapView viewForAnnotation：obj]; 
 
 [view setTransform：CGAffineTransformMakeRotation（rotation）]; 
 [view setCenterOffset：CGPointApplyAffineTransform（anchorPoint，CGAffineTransformMakeRotation（rotation））]; 
 
}]; 
 
} 
  

---

解决方案使用的是在iOS 5中添加到MKMapView的新方法。

请参阅： http://developer.apple.com/library/ios/#documentation/MapKit/Reference/MKMapView_Class/MKMapView/MKMapView.html

- （void）setUserTrackingMode：（MKUserTrackingMode）mode animated：（BOOL）animated; p>

Is it possible to have an embedded MKMapView rotate to always face the direction the iPhone is facing? Basically I want to mimic the Map app rotation feature on my own app.

I see that the iPhone SDK does not expose the functionality. However, I wonder if it would work to rotate the entire view using CGAffineTransformMakeRotate. Would it affect tapping and zooming? Is there a better way?

解决方案

To rotate the mapView but not the annotations you could use the following code to compensate for the maps rotation.

- (void)locationManager:(CLLocationManager *)manager
       didUpdateHeading:(CLHeading *)newHeading
{
  double rotation = newHeading.magneticHeading * 3.14159 / 180;
  CGPoint anchorPoint = CGPointMake(0, -23); // The anchor point for your pin

  [mapView setTransform:CGAffineTransformMakeRotation(-rotation)];

  [[mapView annotations] enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
    MKAnnotationView * view = [mapView viewForAnnotation:obj];

    [view setTransform:CGAffineTransformMakeRotation(rotation)];
    [view setCenterOffset:CGPointApplyAffineTransform(anchorPoint, CGAffineTransformMakeRotation(rotation))];

  }];

}

---

Another sollution is using a new method that has been added in iOS 5 to MKMapView.

Take a look at: http://developer.apple.com/library/ios/#documentation/MapKit/Reference/MKMapView_Class/MKMapView/MKMapView.html

- (void)setUserTrackingMode:(MKUserTrackingMode)mode animated:(BOOL)animated;

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