1.iOS8的定位服务需要用户取申请系统的授权
即需要在plist文件中增加两个string类型的键值对：NSLocationWhenInUseUsageDescription和NSLocationAlwaysUsageDescription。同时在开始定位之前必须调用申请授权的方法：
CLLocationManager *locationManager = [[CLLocationManager alloc]init];
locationManager.delegate = self；
[locationManager requestAlwaysAuthorization];
[locationManager requestWhenInUseAuthorization];
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
locationManager.distanceFilter = kCLDistanceFilterNone;
[locationManager startUpdatingLocation];
requestAlwaysAuthorization和requestWhenInUseAuthorization两个方法即是在申请系统的授权。
2.实机运行时记得要在系统设置中打开手机的定位服务，如果时模拟器的话除了打开模拟器设置中的定位服务外还需要在edit schema 中设置模拟器的默认位置。
3.如果进入了失败的委托方法，可以根据error的code值从
CLError.h文件中查对应的原因
4.为稳妥起见，CLLocationManager的didChangeAuthorizationStatus方法务必实现，代码如下
- (void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status
{
switch (status) {
case kCLAuthorizationStatusNotDetermined:
if ([locationManager respondsToSelector:@selector(requestAlwaysAuthorization)]) {
[locationManager requestAlwaysAuthorization];
}
break;
default:
break;
}
}