iOS 指南针的制作 附带源码
指南针的制作非常简单。
直接看代码吧！
需要添加
<CoreLocation/CoreLocation.h>框架
ViewController.h代码如下：
- #import <UIKit/UIKit.h>
- #import <CoreLocation/CoreLocation.h>
- @interface ViewController : UIViewController<CLLocationManagerDelegate>
- @property (retain, nonatomic) UIImageView *compassImageView;
- @property (retain, nonatomic) CLLocationManager *locationManager;
- @end
ViewController.m代码如下：
- - (void)viewDidLoad
- {
- [super viewDidLoad];
- UIImageView* backgroundImage = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"BackGroundPad.png"]];
- [self.view addSubview:backgroundImage];
- //创建指南针图片
- self.compassImageView = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"Compass_HD.png"]];
- self.compassImageView.center = CGPointMake(370, 500);
- [self.view addSubview:self.compassImageView];
- //初始化locationManager并设置代理类
- self.locationManager = [[CLLocationManager alloc]init];
- self.locationManager.delegate = self;
- if ([CLLocationManager headingAvailable]) {
- //设置精度
- self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;
- //设置滤波器不工作
- self.locationManager.headingFilter = kCLHeadingFilterNone;
- //开始更新
- [self.locationManager startUpdatingHeading];
- }
- else
- {
- UIAlertView *alert=[[UIAlertView alloc]initWithTitle:@"atention" message:@"compass not Available" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil];
- [alert show];
- }
- }
- //调用locationManager成员方法
- - (void)locationManager:(CLLocationManager *)manager didUpdateHeading:(CLHeading *)newHeading
- {
- //重置view的位置
- self.compassImageView.transform = CGAffineTransformIdentity;
- CGAffineTransform transform = CGAffineTransformMakeRotation(-1 * M_PI*newHeading.magneticHeading/180.0);
- self.compassImageView.transform = transform;
- }
这样就OK啦 ！ 要在真机上测试哦！！！