iOS 9 模擬器定位失效排查：權限設定與代理方法未觸發

常見原因清單

1. Info.plist 缺少隱私權限鍵（iOS 8+ 強制）：
   • NSLocationWhenInUseUsageDescription（前台定位）
   • NSLocationAlwaysAndWhenInUseUsageDescription（前後台定位）
2. CLLocationManagerDelegate 未正確設定：

   self.locationManager.delegate = self;
   [self.locationManager startUpdatingLocation];

3. 模擬器未模擬位置：Xcode 模擬器頂部選單 Debug → Location → Custom Location 或選擇預設城市（如 "Apple HQ"）。
4. iOS 9 新增 App Transport Security (ATS)：若定位服務涉及 HTTP 請求，需在 Info.plist 設定 NSAppTransportSecurity 例外。

最小可行程式碼

@import CoreLocation;

@interface ViewController () <CLLocationManagerDelegate>
@property (strong) CLLocationManager *locMgr;
@end

- (void)viewDidLoad {
    [super viewDidLoad];
    _locMgr = [[CLLocationManager alloc] init];
    _locMgr.delegate = self;
    _locMgr.desiredAccuracy = kCLLocationAccuracyBest;
    [_locMgr requestWhenInUseAuthorization]; // 觸發權限彈窗
    [_locMgr startUpdatingLocation];
}

- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray<CLLocation *> *)locations {
    CLLocation *loc = locations.lastObject;
    NSLog(@"Lat: %f, Lon: %f", loc.coordinate.latitude, loc.coordinate.longitude);
}

- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error {
    NSLog(@"定位失敗: %@", error.localizedDescription);
}

排查步驟

1. 確認 Console 有無「This app has attempted to access privacy-sensitive data without a usage description」警告 → 補 Info.plist。
2. 真機測試：模擬器 GPS 精度極低，真機為準。
3. 檢查 didFailWithError 錯誤碼：kCLErrorDenied（用戶拒絕授權）、kCLErrorLocationUnknown（暫時無法定位）。