When the code is as follows, when you enter the page, you can see that UIAlertView pop-up box appears under 1. When you just want to click, he is gone. This is depressed

  CLLocationManager* _locationManager = [[CLLocationManager alloc] init];
  _locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters;
  if ([[UIDevice currentDevice].systemVersion floatValue] >= 8) {
    // Due to IOS8 Change of authorization mechanism located in   Manual authorization is required
    // Obtain authorization authentication
    [_locationManager requestWhenInUseAuthorization];
  }
  [_locationManager startUpdatingLocation];

The reason is that it is released after being used up under arc. In order to ensure that users can click permissions, they only need to set _ locationManager as an attribute, as follows:

@property (strong, nonatomic) CLLocationManager* locationManager;

  self.locationManager = [[CLLocationManager alloc] init];
  _locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters;
  if ([[UIDevice currentDevice].systemVersion floatValue] >= 8) {
    // Due to IOS8 Change of authorization mechanism located in   Manual authorization is required
    // Obtain authorization authentication
    [_locationManager requestWhenInUseAuthorization];
  }
  [_locationManager startUpdatingLocation];

It’s no problem to test again like this!