检查用户何时从 iOS 设置应用程序返回

Posted 2023-03-05

【中文标题】检查用户何时从 iOS 设置应用程序返回

【英文标题】：Check when user returns from Settings app iOS

【发布时间】：2016-09-16 12:36:38

【问题描述】：

如果用户禁用了设备位置服务，我需要在我的应用程序中找到用户的位置，我会像这样检查。

if([CLLocationManager locationServicesEnabled])

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

else if(![CLLocationManager locationServicesEnabled])

    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message:@"Location Services are disabled please enable location services to enjoy nearby experience" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Settings", nil];
    alert.tag = 103;
    [alert show];

在我的警报视图中，我将用户引导至这样的位置设置

 else if(alertView.tag == 103)

    if(buttonIndex == 1)
    

        NSURL*url=[NSURL URLWithString:@"prefs:root=LOCATION_SERVICES"];
        [[UIApplication sharedApplication] openURL:url];
    

用户从设置返回后如何再次获取位置

【参考方案1】：

您可以在applicationWillEnterForeground 中管理您的东西，因为当您来自设置app to your app 时会调用此方法。

您可以使用这种方法编写代码，例如，

 if([CLLocationManager locationServicesEnabled])

if([locationManager respondsToSelector:@selector(requestWhenInUseAuthorization)])

    [locationManager requestWhenInUseAuthorization];

【参考方案2】：

使用Location Delegate 方法：-

if([CLLocationManager locationServicesEnabled])

    if([locationManager respondsToSelector:@selector(requestWhenInUseAuthorization)])
    
        [locationManager requestWhenInUseAuthorization];
         //Set Location Delegate
        locationManager.delegate = self;

        locationManager.distanceFilter = kCLDistanceFilterNone;
        locationManager.desiredAccuracy = kCLLocationAccuracyBest;
         //Update Location start
        [locationManager startUpdatingLocation];
    

else if(![CLLocationManager locationServicesEnabled])

    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message:@"Location Services are disabled please enable location services to enjoy nearby experience" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Settings", nil];
    alert.tag = 103;
    [alert show];


#pragma mark CLLocationManager Delegate

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation 

    //NSLog(@"OldLocation %f %f", oldLocation.coordinate.latitude, oldLocation.coordinate.longitude);
    //NSLog(@"NewLocation %f %f", newLocation.coordinate.latitude, newLocation.coordinate.longitude);

     [locationManager stopUpdatingLocation];

【讨论】：

我在用那个函数会不会被调用？

是的，当然，但首先你设置代理并开始更新位置...

是的，但是在我得到位置后，一旦我停下来更新。我正在使用方法 didUpdateToLocations

添加这一行 [locationManager stopUpdatingLocation];