如何使iOS擷取的地理位置有效

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關於CLLocationManager擷取地理位置遇到的一些小事；

項目使arc  

第一步：擷取是否允許定位

-(BOOL)IsLocationServicesEnabled{    /**     * [CLLocationManager locationServicesEnabled] 系統設定允許定位服務是否開啟     * [CLLocationManager authorizationStatus] != kCLAuthorizationStatusDenied  APP是否開啟定位服務     */    return ([CLLocationManager locationServicesEnabled] && [CLLocationManager authorizationStatus] != kCLAuthorizationStatusDenied);}

第二步：開始定位，建立全域變數 （個人理解：如果CLLocationManager的屬性不是全域的在ARC項目中，出了函數體 局部變數就會被release）

@property (nonatomic, strong) CLLocationManager *userLocation;

　　

-(void)getUserLocationInfomation{    if ([self IsLocationServicesEnabled])    {                if (!self.userLocation)        {            self.userLocation = [[CLLocationManager alloc]init];        }                self.userLocation.delegate = self;        //選擇定位的方式為最優的狀態        self.userLocation.desiredAccuracy = kCLLocationAccuracyBest;        //發生事件的最小距離間隔        self.userLocation.distanceFilter = kCLDistanceFilterNone;        [self.userLocation startUpdatingLocation];    }}

第三部分：delegate回調

#pragma locationManager delegate-(void)locationManager:(CLLocationManager *)manager   didUpdateToLocation:(CLLocation *)newLocation          fromLocation:(CLLocation *)oldLocation{    NSTimeInterval locationAge = -[newLocation.timestamp timeIntervalSinceNow];    if (locationAge > 180.0) return;    // 測試該水平精度是否有效    if (newLocation.horizontalAccuracy < 0) return;    // 寫你的代碼 現在拿到的newLocation是有效
   [self.userLocation stopUpdatingLocation];
   self.userLocation.delegate = nil;

}-(void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error{ }

　　

如何使iOS擷取的地理位置有效