标签栏和Mapview问题 [英] Tab bar and Mapview issues

问题描述

我真的很困惑这个问题.我最近在应用程序中的mapview选项卡遇到了问题.甚至达到重新开始的地步.我只是想知道我是唯一遇到此问题的人还是在这里做错了什么.

I'm really confused about this issue. I have recently been having issues with my mapview tab in my application. Even to the point of starting over again. I'm just wondering if I am the only one having this issue or am I doing something wrong here.

我对iOS还是很陌生，但是我知道如何定义mapview的中心和跨度以便以用户的位置为中心.

I am fairly new to iOS but I know how to define a mapview's center and span in order to center on the user's location.

我已经在它自己的视图中构建了它，并且似乎可以正常工作，但是当我将其放在选项卡控制器中时...出现了问题.在显示用户位置时，地图保持缩小状态.应该可以放大用户的位置.

I've built this in its own view and it seems to work but when I put it in a tab controller...I have an issue. The map stays zoomed out while showing the user's location. It's supposed to show the user's location zoomed in.

我的MapViewController:

My MapViewController:

- (void)viewDidLoad
{
    [super viewDidLoad];
    [self.mapView.delegate self];
    [self.mapView setShowsUserLocation:YES];
    // Do any additional setup after loading the view from its nib.
}

-(void)mapView:(MKMapView *)mapView
didUpdateUserLocation:(MKUserLocation *)userLocation
{
    CLLocationCoordinate2D loc = [userLocation coordinate];
    MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(loc, 500, 500);
    [self.mapView setRegion:region animated:YES];
}

我还认为这可能与我在委托中创建选项卡控制器的方式有关.

I also thought it could have something to do with the way I created the tab controller in the delegate.

我的应用程序委托人:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    UIViewController *viewController1 = [[NWSWelcomeViewController alloc] initWithNibName:@"NWSWelcomeViewController" bundle:nil];
    UIViewController *viewController2 = [[NWSMapViewViewController alloc] initWithNibName:@"NWSMapViewViewController" bundle:nil];
  //  UIViewController *viewController3 = [[NWSSettingsViewController alloc] initWithNibName:@"NWSSettingsViewController" bundle:nil];
    self.tabBarController = [[UITabBarController alloc] init];
    self.tabBarController.viewControllers = @[viewController1, viewController2, /* viewController3 */];
    self.window.rootViewController = self.tabBarController;
    [self.window makeKeyAndVisible];
    return YES;
}

我正在为iOS 5.1编写程序，并且正在使用最新的Xcode.

I am writing for iOS 5.1 and I am using the latest Xcode.

是的，我在mapView上启用了缩放设置.

Yes, I have the settings for zooming enabled on the mapView.

我只想获取用户位置，以将地图视图放大到用户的位置.

I just want to get the user location to zoom in the mapview to the user's location.

推荐答案

viewDidLoad中的这一行:

[self.mapView.delegate self];

不执行任何操作(它正在尝试将消息self发送到self.mapView.delegate).

does nothing (it is trying to send the message self to self.mapView.delegate).

它实际上并没有设置地图视图的delegate，因此从未调用didUpdateUserLocation.

It doesn't actually set the map view's delegate and so the didUpdateUserLocation never gets called.

您可能的意思是:

[self.mapView setDelegate:self];

或者这个:

self.mapView.delegate = self;

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