iOS_CLLocation定位

#import "ViewController.h"
#import <CoreLocation/CoreLocation.h>
@interface ViewController ()<CLLocationManagerDelegate>
@property (weak, nonatomic) IBOutlet UITextField *longitude;
@property (weak, nonatomic) IBOutlet UITextField *latitude;
@property (weak, nonatomic) IBOutlet UITextField *height;
@property (weak, nonatomic) IBOutlet UITextField *speed;
@property (weak, nonatomic) IBOutlet UITextField *direction;
@property(strong,nonatomic)CLLocationManager *locationManager;
@end

@implementation ViewController
- (IBAction)beginLocation:(UIButton *)sender
{
    if ([CLLocationManager locationServicesEnabled]) {
        NSLog(@"开始执行定位服务");
        //设定定位精度：最佳精度
        self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;
        //设置距离过滤器为50米，表示每移动50米更新一次位置
        self.locationManager.distanceFilter = 50;
        //将视图控制器自身设置为CLLocationManager的delegate
        //因此该视图控制器需要实现CLLocationManagerDelegate协议
        self.locationManager.delegate = self;
    }
    else
    {
        NSLog(@"无法使用定位服务");
    }
}
-(void) viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];
    //开启定位
    [_locationManager startUpdatingLocation];
}
-(void) viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
    //结束定位
    [_locationManager stopUpdatingLocation];
}
#pragma mark - CLLocationDelegate代理协议
//成功获取定位数据后将会激发该方法
-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
    //获取最后一个定位数据
    CLLocation *location = [locations lastObject];
    //依次获取CLLocation中封装的经度、纬度、高度、速度、方向等信息
    self.longitude.text = [NSString stringWithFormat:@"%g",location.coordinate.longitude];//纬度
    NSLog(@"%f",location.coordinate.longitude);
    self.latitude.text = [NSString stringWithFormat:@"%g",location.coordinate.latitude];//经度
    self.height.text = [NSString stringWithFormat:@"%g",location.altitude];
    self.speed.text = [NSString stringWithFormat:@"%g",location.speed];
    self.direction.text = [NSString stringWithFormat:@"%g",location.course];
    
}
//定位失败执行的操作
-(void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
    NSLog(@"定位失败：%@",error);
}
- (void)viewDidLoad {
    [super viewDidLoad];
    //创建CLLocationManager对象
    self.locationManager = [[CLLocationManager alloc]init];
}

@end

#import "ViewController.h"
#import <CoreLocation/CoreLocation.h>
@interface ViewController ()<CLLocationManagerDelegate>
{
    CALayer *znzLayer;
}
@property(strong,nonatomic)CLLocationManager *locationManager;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    //如果磁力计可用，则开始监听方向改变
    if ([CLLocationManager headingAvailable]) {
        //创建显示方向的指南针图片Layer;
        znzLayer = [[CALayer alloc]init];
        NSInteger screenHeight = [UIScreen mainScreen].bounds.size.height;
        NSInteger y = (screenHeight - 320)/2;
        znzLayer.frame = CGRectMake(0, y, 320, 320);
        //设置znzLayer显示的图片
        znzLayer.contents = (id)[[UIImage imageNamed:@"1.png"]CGImage];
        //将znzLayer添加到系统的UIView中
        [self.view.layer addSublayer:znzLayer];
        //创建CLLocationManager对象
        self.locationManager = [[CLLocationManager alloc]init];
        self.locationManager.delegate = self;
        [self.locationManager startUpdatingHeading];
        
    }
    else
    {
        [[[UIAlertView alloc]initWithTitle:@"提醒" message:@"您的设备不支持磁力计" delegate:self cancelButtonTitle:@"确定" otherButtonTitles: nil]show];
    }
}
#pragma mark - CLLocationManagerDelegate代理方法
-(void)locationManager:(CLLocationManager *)manager didUpdateHeading:(CLHeading *)newHeading
{
    //将设备的方向换算成弧度
    CGFloat headings = -1.0f *M_PI * newHeading.magneticHeading / 180.0f;
    //创建不断改变CALayer的transform属性的属性动画
    CABasicAnimation *anim = [CABasicAnimation animationWithKeyPath:@"transform"];
    CATransform3D fromValue = znzLayer.transform;
    //设置动画开始的属性值
    anim.fromValue = [NSValue valueWithCATransform3D:fromValue];
    //绕Z轴旋转heading弧度的变换矩阵
    CATransform3D toValue = CATransform3DMakeRotation(headings, 0, 0, 1);
    //设置动画结束时的属性
    anim.toValue = [NSValue valueWithCATransform3D:toValue];
    anim.duration = 0.5;
    anim.removedOnCompletion = YES;
    //设置动画结束后znzLayer的变换矩阵
    znzLayer.transform = toValue;
    //为znzLayer添加动画
    [znzLayer addAnimation:anim forKey:nil];
    
}
-(BOOL)locationManagerShouldDisplayHeadingCalibration:(CLLocationManager *)manager
{
    return YES;
}

@end