Question

您好我在iOS 6/7上获取用户当前位置时遇到问题。我需要用户在应用启动时的位置，但需要6-8秒才能获得用户位置，直到找到该位置，该应用程序不会隐藏启动画面，这对我来说是不行的。（对我而言）。

我想使用dispatch_async（GCD）在后台获取用户位置，但它没有改变一件事:(。所以我想知道有没有办法解决我的问题。我非常感谢任何帮助。提前谢谢。这是我的应用程序初始化的代码：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{

self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

FinalMenuViewController *leftMenuViewController = [[FinalMenuViewController alloc] init];
MFSideMenuContainerViewController *container = [MFSideMenuContainerViewController
                                                containerWithCenterViewController:[self navigationController]
                                                leftMenuViewController:leftMenuViewController
                                                rightMenuViewController:nil];
container.panMode = MFSideMenuPanModeNone;
self.window.rootViewController = container;

if(([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0)){
    [[UIBarButtonItem appearance] setTintColor:[UIColor whiteColor]];
}else{
    [[UIBarButtonItem appearance] setTintColor:[UIColor colorWithRed:(250.0/255.0) green:(139.0/255.0) blue:(40.0/255.0) alpha:1.0]];
}

[self.window makeKeyAndVisible];

[self displaySplashImage];

[self setDefaultData];

[self initLocationManager];

return YES;
}

-(void) displaySplashImage{

CGFloat screenHeight = [UIScreen mainScreen].bounds.size.height;

UIImage* myImage;
NSString *imgName = ([[UIScreen mainScreen] bounds].size.height == 568) ? @"Default-568h@2x.png" : @"Default.png";
myImage = [UIImage imageNamed:imgName];
self.splashView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, self.window.frame.size.width, self.window.frame.size.height)];

mainV = [[UIView alloc] initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, screenHeight)];
[mainV addSubview:self.splashView];
[mainV setBackgroundColor: [UIColor clearColor]];

self.splashView.image = myImage;
self.splashView.contentMode = UIViewContentModeScaleAspectFit;

[self.window addSubview:mainV];
[self.window bringSubviewToFront:mainV];
[self removeImageView];

}
-(void) removeImageView{
if(mainV){
    [mainV removeFromSuperview];
}
}

---编辑---- 以下是获取当前位置的代码

-(void) initManager{
locManager_ = [[CLLocationManager alloc] init];
locManager_.delegate = self;
locManager_.distanceFilter = 50;
locManager_.desiredAccuracy = kCLLocationAccuracyBest;
[locManager_ startUpdatingLocation];
}

- (void)locationManager:(CLLocationManager *)manager
didUpdateLocations:(NSArray *)locations __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_6_0){
CLLocation *loc = [locations lastObject];
GlobalVariables *vars = [GlobalVariables getInstance];
vars.currentLocatoin = loc;

}
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error {
if ([error domain] == kCLErrorDomain) {
    switch ([error code]) {
        case kCLErrorDenied:{
            NSString *msg = @"ERROR_MSG_HERE";
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message:msg delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil];
            [alert show];
            break;

        }
        case kCLErrorLocationUnknown:{
            NSString *msg = @"We were unable to find your location";
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message:msg delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil];
            [alert show];
            break;
        }

        default:
            break;
    }
} else {

}
}

Answer 1

您可以使用dispatch_after创建延迟，延迟完成后，开始执行需要用户位置的代码。以下是我自己的代码中的示例，其中我将CLLocationManager子类化，并将更新后的位置存储在私有ivar中（在我的locationManager CLLocationManager委托方法中设置子类）：

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

然后可以通过getter（getLastUpdatedUserLocation）访问更新的位置。

以下是代码：

UserLocationManager* userLocationManager = [UserLocationManager sharedLocationManager];

    [userLocationManager requestAuthorizationAndStartUpdates];

    __block CLLocation* userLocation = [userLocationManager getLastUpdatedUserLocation];

    if(userLocation == nil){

        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 6.00*NSEC_PER_SEC), dispatch_get_main_queue(), ^{

            userLocation = [userLocationManager getLastUpdatedUserLocation];


            NSLog(@"The user location after 6.00 secondss is lat: %f, long: %f",userLocation.coordinate.latitude,userLocation.coordinate.longitude);
        });
    }

在iOS 6/7的后台线程中获取用户的当前位置

1 个答案: