在应用程序中使用原生iOS指南针 [英] Use native iOS compass within an app

问题描述

是否可以在我自己的应用程序中使用iOS的原生指南针？或者我是否需要为自己的指南针绘制和制作动画？

Is it possible to use the native compass that iOS has within my own application? Or do I need to draw and animate my own compass?

推荐答案

没有原生指南针 UIView 。为了使用磁力计，你必须使用CoreLocation和以下委托方法：

There is no native compass UIView. In order to use the magnetometer, you'll have to use CoreLocation and the following delegate method:

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

将UIView旋转到point North（bearingView是一个UIImageView）：

to rotate a UIView to point North (bearingView is a UIImageView):

float heading = newHeading.magneticHeading; //in degrees
float headingDegrees = (heading*M_PI/180); //assuming needle points to top of iphone. convert to radians
self.bearingView.transform = CGAffineTransformMakeRotation(headingDegrees);

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