当用户退出应用程序时将注释存储在 MapKit 中

发布于 2024-10-09 07:23:30 字数 303 浏览 0 评论 0原文

我希望在退出应用程序时存储我的注释，并在启动应用程序时再次弹出......我怎样才能做到这一点？有什么想法吗？

-(IBAction)storeLocation:(id)sender{

    SparaPosition *position=[[SparaPosition alloc] initWithCoordinate:location];
    [mapView addAnnotation:position];
    savedPosition = location;

请...需要一些帮助！
谢谢！

原文

I want my annotation to be stored when I quit the application and pop up again when I launch the application.... How can I make this possible? Any ideas?

-(IBAction)storeLocation:(id)sender{

    SparaPosition *position=[[SparaPosition alloc] initWithCoordinate:location];
    [mapView addAnnotation:position];
    savedPosition = location;

Please... need some help!
Thanks!

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感悟人生的甜 2024-10-16 07:23:30

如果您只想保存一个注释的坐标，最简单的方法是使用 NSUserDefaults。

保存：

NSUserDefaults *ud = [NSUserDefaults standardUserDefaults];
[ud setDouble:location.latitude forKey:@"savedCoordinate-latitude"];
[ud setDouble:location.longitude forKey:@"savedCoordinate-longitude"];
[ud setBool:YES forKey:@"savedCoordinate-exists"];
[ud synchronize];

加载（例如在 viewDidLoad 中）：

NSUserDefaults *ud = [NSUserDefaults standardUserDefaults];
if ([ud boolForKey:@"savedCoordinate-exists"])
{
    CLLocationCoordinate2D savedCoordinate;
    savedCoordinate.latitude = [ud doubleForKey:@"savedCoordinate-latitude"];
    savedCoordinate.longitude = [ud doubleForKey:@"savedCoordinate-longitude"];
    //create annotation object using savedCoordinate and add to map view...
}

If you want to save just one annotation's coordinates, simplest way is to use NSUserDefaults.

To save:

NSUserDefaults *ud = [NSUserDefaults standardUserDefaults];
[ud setDouble:location.latitude forKey:@"savedCoordinate-latitude"];
[ud setDouble:location.longitude forKey:@"savedCoordinate-longitude"];
[ud setBool:YES forKey:@"savedCoordinate-exists"];
[ud synchronize];

To load (in viewDidLoad for example):

NSUserDefaults *ud = [NSUserDefaults standardUserDefaults];
if ([ud boolForKey:@"savedCoordinate-exists"])
{
    CLLocationCoordinate2D savedCoordinate;
    savedCoordinate.latitude = [ud doubleForKey:@"savedCoordinate-latitude"];
    savedCoordinate.longitude = [ud doubleForKey:@"savedCoordinate-longitude"];
    //create annotation object using savedCoordinate and add to map view...
}

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