iOS地理位置使用

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iOS地理位置使用經緯度介紹

英語不好，老是分不開這兩個單詞，在這記錄一下。

經度：longitude,豎線,(long有縱向之意，用來表示經度)
緯度：latitude,

使用

1.在項目匯入 CoreLocation.framework；

2.申請使用者授權（ios 8之後才需要）。在info.plist檔案中添加一個鍵：
NSLocationAlwaysUsageDescription或者NSLocationWhenInUseUsageDescription。其中NSLocationAlwaysUsageDescription是要始終使用定位服務，NSLocationWhenInUseUsageDescription是只在前台使用定位服務。
分別對應的授權方法為：

- (void)requestAlwaysAuthorization;- (void)requestWhenInUseAuthorization;

3.初始化，代碼如下：

    //建立地理位置管理對象    self.locationManager = [[CLLocationManager alloc] init];    //申請授權    [self.locationManager requestAlwaysAuthorization];    //設定管理員委託    self.locationManager.delegate = self;    //設定精度    self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;    //啟動位置管理器    [self.locationManager startUpdatingLocation];

4.實現委託方法

//地理位置發生更新時- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations{    //如果在一段比較短的時間發生了多次位置更新，這幾次位置更新有可能會被一次性全部上報。無論何時，最後一項表示當前位置    CLLocation *newLocation = [locations lastObject];        //顯示緯度    NSString *latitudeString = [NSString stringWithFormat:@"%g\u00B0",newLocation.coordinate.latitude];    self.latitudeLabel.text = latitudeString;        //顯示經度    NSString *longitudeString = [NSString stringWithFormat:@"%g\u00B0",newLocation.coordinate.longitude];    self.longitudeLabel.text = longitudeString;        //顯示水平精度    NSString *horizontalAccuracyString = [NSString stringWithFormat:@"%gm",newLocation.horizontalAccuracy];    self.horizontalAccuracyLabel.text = horizontalAccuracyString;        //顯示海拔高度    NSString *altitudeString = [NSString stringWithFormat:@"%gm",newLocation.altitude];    self.altitudeLabel.text = altitudeString;        //顯示垂直精度    NSString *verticalAccuracyString = [NSString stringWithFormat:@"%gm",newLocation.verticalAccuracy];    self.verticalAccuracyLabel.text = verticalAccuracyString;        if (newLocation.verticalAccuracy < 0 || newLocation.horizontalAccuracy < 0) {        return;    }        if (newLocation.horizontalAccuracy > 100 || newLocation.verticalAccuracy > 50) {        return;    }        if (self.previousPoint == nil) {        return;    } else {        self.totalMovementDistance += [newLocation distanceFromLocation:self.previousPoint];    }    self.previousPoint = newLocation;        NSString *distanceString = [NSString stringWithFormat:@"%gm",self.totalMovementDistance];    self.distanceTraveledLabel.text = distanceString;}//擷取地理位置失敗時- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error{    NSString *errorType = (error.code == kCLErrorDenied) ? @"Access Denied": @"Unknown Error";    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error getting Location" message:errorType delegate:nil cancelButtonTitle:@"Okay" otherButtonTitles:nil];    [alert show];}

代碼下載

https://github.com/limaofuyuanzhang/WhereAmI

參考

iOS定位服務的應用
《精通iOS開發(第6版)》第19章 Core Location和Map Kit

iOS地理位置使用