关于iOS8无法定位

原来使用
    if (![CLLocationManager locationServicesEnabled]){
        [BDUBaseToolsSpecial displayAlert:@"请开启手机定位功能!"];
        return nil;
    }
    CLAuthorizationStatus status=[CLLocationManager authorizationStatus];
    if (status==kCLAuthorizationStatusDenied){
        [BDUBaseToolsSpecial displayAlert:@"请允许本程序定位"];
        return nil;
    }
即可。
升级XCode iOS8 SDK后，查看CLAuthorizationStatus这个枚举，发现多了几个选项。所以现在要这样（大概示意，具体自己修改）
    CLLocationManager *locationManager=[[[CLLocationManager alloc]init]autorelease];
    self.locationManager=locationManager;
    locationManager.delegate=self;
    locationManager.desiredAccuracy=kCLLocationAccuracyNearestTenMeters;
    locationManager.distanceFilter=10.0f;
   
    if( ([[[UIDevice currentDevice] systemVersion] doubleValue]>=8.0f)) {
        CLAuthorizationStatus status = [CLLocationManager authorizationStatus];
        if (status == kCLAuthorizationStatusNotDetermined || status==kCLAuthorizationStatusDenied || status==kCLAuthorizationStatusRestricted || status==kCLAuthorizationStatusAuthorizedWhenInUse) {
            [locationManager requestAlwaysAuthorization];
        } else if (status == kCLAuthorizationStatusAuthorizedAlways || status==kCLAuthorizationStatusAuthorized) {
            [locationManager startUpdatingLocation];
        } else {
            [BDUBaseToolsSpecial displayAlert:@"定位授权状态出错,请点击取消返回上级界面"];
            return;
        }
    } else {
        [locationManager startUpdatingLocation];
    }

然后
-(void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status{
    switch (status) {
        case kCLAuthorizationStatusAuthorizedAlways:
            [self.locationManager startUpdatingLocation];
            break;
        default:
            [BDUBaseToolsSpecial displayAlert:@"定位授权状态出错,请在系统设置界面中的\"隐私－>定位服务\"中设置本程序权限为始终允许访问位置信息."];
            break;
    }
}
可以根据用途，自行选择使用 [locationManager requestAlwaysAuthorization];还是 [locationManager requestWhenInUseAuthorization];查看这2个方法的注释，需要分别在app的plist文件中声明NSLocationAlwaysUsageDescription和NSLocationWhenInUseUsageDescription这2个key，否则这2个方法不起作用。