是否可以直接从 appDelegate 获取 GPS 位置 ios8

Question

我正在 ios8+ 开发一个应用程序，我必须在其中获取用户的位置。当我在屏幕中使用 CLLocationManager 时，我能够获取位置 (viewcontroller)。但是当我尝试直接从 AppDelegate 获取位置时，似乎出现了一些问题，我没有获得任何位置（流程没有进入委托方法）。 谁能帮我解决这个问题。

这是我使用的代码：

CLLocationManager *locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
if ([locationManager respondsToSelector:@selector(requestWhenInUseAuthorization)]) {
    [locationManager requestWhenInUseAuthorization];
}
if ([locationManager respondsToSelector:@selector(requestAlwaysAuthorization)]) {
    [locationManager requestAlwaysAuthorization];
}
[locationManager startUpdatingLocation];

你能帮我解决这个问题吗？谢谢

Answer 1

还知道 CoreLocation 权限已更改 iOS 8. 如果您不请求新的权限授权，CoreLocation 不会执行任何操作。它悄悄地失败了，因为永远不会调用委托方法。

Try this link

虽然文章非常详细和冗长，但实际的代码修复可能像这样：

if ([locationManager respondsToSelector:@selector(requestWhenInUseAuthorization)]) {
[locationManager requestWhenInUseAuthorization];
}

并且您必须向 info.plist 添加一个值，这是要在权限警报中显示的消息。请参阅屏幕截图。

键：NSLocationWhenInUseUsageDescription

值：需要位置才能确定您所在的位置（您可以将其更改为任何您想要的）

Answer 2

1. 将 CLLocationManagerDelegate 添加到 AppDelegate.h

@interface AppDelegate : NSObject < UIApplicationDelegate, CLLocationManagerDelegate> {

2. 将 CLLocationManager 对象添加为 属性 到 AppDelegate.m

您必须将 CLLocationManager 对象实现为 属性。

@interface AppDelegate () @property (nonatomic, strong) CLLocationManager *locationManager; @end

3. 在AppDelegate.m
中将locationManager替换为self.locationManager

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { self.locationManager = [[CLLocationManager alloc] init]; self.locationManager.delegate = self; self.locationManager.desiredAccuracy = kCLLocationAccuracyBest; if ([self.locationManager respondsToSelector:@selector(requestWhenInUseAuthorization)]) { [self.locationManager requestWhenInUseAuthorization]; } if ([self.locationManager respondsToSelector:@selector(requestAlwaysAuthorization)]) { [self.locationManager requestAlwaysAuthorization]; } [self.locationManager startUpdatingLocation];

参考。 https://developer.apple.com/library/ios/documentation/CoreLocation/Reference/CLLocationManager_Class/

Keeping a strong reference to the location manager object is required until all tasks involving that object are complete. Because most location manager tasks run asynchronously, storing your location manager in a local variable is insufficient.