苹果在iOS8上更新了CoreLocation的授权获取方式，在原来的基础上，不仅需要调用授权函数，还需要对info.plist进行相应的配置。
在iOS上获取经纬度使用的是CoreLocationManager，它来自CoreLocation.framework框架，使用时应当包含框架的总头文件：
#import <CoreLocation/CoreLocation.h>一般是先创建管理者，然后成为其代理，对于iOS7，直接调用startUpdatingLocation即可开始监听，而对于iOS8，还需要调用一个方法进行授权，根据使用状况的不同，有两种授权，分别是使用时获取位置和持续获取位置，根据需要的不同进行调用：[self.manager requestAlwaysAuthorization];[self.manager requestWhenInUseAuthorization];一般直接获取第一个即可，应用面更广。
除此之外，在info.plist中加入两个键，值为string，string中的内容就是请求授权时显示的说明：
对应于两种授权，有NSLocationWhenInUseUsageDescription和NSLocationAlwaysUsageDescription两个键。
在每次开启应用时，会调用一个代理方法来判断授权状态：通过这个方法判断是否授权成功，如果成功则调用startUpdatingLocation来开始定位。
// 授权状态发生改变时调用-(void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status{/*typedef NS_ENUM(int, CLAuthorizationStatus) {// User has not yet made a choice with regards to this applicationkCLAuthorizationStatusNotDetermined = 0,// This application is not authorized to use location services. Due// to active restrictions on location services, the user cannot change// this status, and may not have personally denied authorizationkCLAuthorizationStatusRestricted,// User has explicitly denied authorization for this application, or// location services are disabled in Settings.kCLAuthorizationStatusDenied,// User has granted authorization to use their location at any time,// including monitoring for regions, visits, or significant location changes.kCLAuthorizationStatusAuthorizedAlways NS_ENUM_AVAILABLE(NA, 8_0),// User has granted authorization to use their location only when your app// is visible to them (it will be made visible to them if you continue to// receive location updates while in the background). Authorization to use// launch APIs has not been granted.kCLAuthorizationStatusAuthorizedWhenInUse NS_ENUM_AVAILABLE(NA, 8_0),// This value is deprecated, but was equivalent to the new -Always value.kCLAuthorizationStatusAuthorized NS_ENUM_DEPRECATED(10_6, NA, 2_0, 8_0, "Use kCLAuthorizationStatusAuthorizedAlways") = kCLAuthorizationStatusAuthorizedAlways};*/switch (status) {case kCLAuthorizationStatusAuthorizedAlways:NSLog(@"持续使用授权");[self.manager startUpdatingLocation];break;case kCLAuthorizationStatusAuthorizedWhenInUse:NSLog(@"使用中授权");[self.manager startUpdatingLocation];break;case kCLAuthorizationStatusDenied:NSLog(@"授权被拒绝");break;case kCLAuthorizationStatusNotDetermined:NSLog(@"等待用户授权");break;default:break;}}因为iOS7直接开始获取位置即可，因此应当对两种系统区分对待，用UIDevice获取到系统版本，针对不同的系统进行不同的处理，，如果是iOS8以前的系统，直接开始获取位置：- (void)viewDidLoad {[super viewDidLoad];// 1.创建CoreLocationManagerCLLocationManager *manager = [[CLLocationManager alloc] init];self.manager = manager;// 2.成为其代理self.manager.delegate = self;if ([[UIDevice currentDevice].systemVersion doubleValue] >= 8.0) {[self.manager requestAlwaysAuthorization];}else{// iOS8以前直接开始定位[self.manager startUpdatingLocation];}}要判断是否成功的开始定位，实现代理方法locationManager:didUpdateLocations:来观察。
有关经纬度、方向、区域判断等请见下节。
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