本文將帶你了解IOS開發入門之ios指南針，希望本文對大家學IOS有所幫助

參考http://blog.sina.com.cn/s/blog_4a37054201013nhr.html

可運行的代碼如下

1.拖拽ImageView ,關聯變量到.h中

2.代碼如下

//

//? ViewController.h

//? SouthDemo

//

//? Created by xiao7 on 14/10/25.

//? Copyright (c) 2014年 killinux. All rights reserved.

//

#import

#import

@interface ViewController : UIViewController

@property (strong, nonatomic) CLLocationManager *locationManager;

@property (strong, nonatomic) IBOutlet UIImageView *arrowImageView;

@end

[/code

Java代碼 ?//??//??ViewController.m??//??SouthDemo??//??//??Created?by?xiao7?on?14/10/25.??//??Copyright?(c)?2014年?killinux.?All?rights?reserved.??//????#import?"ViewController.h"??????@interface?ViewController?()????@end????@implementation?ViewController??????-?(void)viewDidLoad?{??????[super?viewDidLoad];??????//NSLog(@"SourceDemo");??????_arrowImageView?=?[[UIImageView?alloc]?initWithImage:[UIImage?imageNamed:@"compass.png"]];????????????_arrowImageView.center?=?CGPointMake(160,?240);????????????[self.view?addSubview:_arrowImageView];??????self.locationManager=?[[CLLocationManager?alloc]init];??????self.locationManager.delegate?=?self;????????????if?([CLLocationManager?headingAvailable])?{??????????//設置精度??????????self.locationManager.desiredAccuracy?=?kCLLocationAccuracyBest;??????????//設置濾波器不工作??????????self.locationManager.headingFilter?=?kCLHeadingFilterNone;??????????//開始更新??????????[self.locationManager?startUpdatingHeading];??????}??????????}??-(void)locationManager:(CLLocationManager?*)manager?didUpdateHeading:(CLHeading?*)newHeading??{??????NSLog(@"didUpdateHeading---->");??????//每次要重置view的位置，才能保證圖片每次偏轉量正常，而不是疊加，指針方向正確。??????_arrowImageView.transform?=?CGAffineTransformIdentity;????????????CGAffineTransform?transform?=?CGAffineTransformMakeRotation(-1?*?M_PI*newHeading.magneticHeading/180.0);??????????????????//????CGAffineTransform?transform?=?CGAffineTransformMakeTranslation(10,?50);??????_arrowImageView.transform?=?transform;??}??-?(void)didReceiveMemoryWarning?{??????[super?didReceiveMemoryWarning];??????//?Dispose?of?any?resources?that?can?be?recreated.??}????@end??//

//? ViewController.m

//? SouthDemo

//

//? Created by xiao7 on 14/10/25.

//? Copyright (c) 2014年 killinux. All ? rights reserved.

//

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

//NSLog(@"SourceDemo");

_arrowImageView = [[UIImageView ? alloc] initWithImage:[UIImage imageNamed:@"compass.png"]];

_arrowImageView.center = ? CGPointMake(160, 240);

[self.view ? addSubview:_arrowImageView];

self.locationManager= [[CLLocationManager ? alloc]init];

self.locationManager.delegate = ? self;

if ([CLLocationManager ? headingAvailable]) {

//設置精度

self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;

//設置濾波器不工作

self.locationManager.headingFilter = kCLHeadingFilterNone;

//開始更新

[self.locationManager ? startUpdatingHeading];

}

}

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

{

NSLog(@"didUpdateHeading---->");

//每次要重置view的位置，才能保證圖片每次偏轉量正常，而不是疊加，指針方向正確。

_arrowImageView.transform = ? CGAffineTransformIdentity;

CGAffineTransform transform = ? CGAffineTransformMakeRotation(-1 * ? M_PI*newHeading.magneticHeading/180.0);

//??? CGAffineTransform transform = ? CGAffineTransformMakeTranslation(10, 50);

_arrowImageView.transform = ? transform;

}

- (void)didReceiveMemoryWarning {

[super ? didReceiveMemoryWarning];

// Dispose of any resources that ? can be recreated.

}

@end

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