ios地图定位学习

官网的教程，

第一步：

The value for the UIRequiredDeviceCapabilities is an array of strings indicating the features that your app requires. Two strings are relevant to location services:

• Include the location-services string if you require location services in general.
• Include the gps string if your app requires the accuracy offered only by GPS hardware.

在info.list中的required device capabilities中添加location-services和gps字符串

第二步：

在h文件中输入：

@property(strong, nonatomic)CLLocationManager *locationManager;

在.m文件中输入：

if (_locationManager == nil) {
        _locationManager = [[CLLocationManager alloc] init];
    }
    _locationManager.delegate = self;
    _locationManager.desiredAccuracy = kCLLocationAccuracyBest;
    [_locationManager requestAlwaysAuthorization];
    [_locationManager startUpdatingLocation];

第三步：

实现CLLocationManagerDelegate代理

- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
此方法是在startUpdatingLocation方法执行后，立即执行的。

但在ios8下，并没有执行代理里面的方法。查阅了资料之后，发现ios8里面需要在info.list中添加key

	NSLocationWhenInUseDescription，允许在前台获取GPS的描述
	NSLocationAlwaysUsageDescription，允许在后台获取GPS的描述
然后在xcode的开发者文档中得到了验证。在Cocoa Keys中，有下面说明。