Question

如何使用文本字段设置经度和纬度？我试过让我的文本域变成双重但它似乎崩溃了。

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    mapview.showsUserLocation = YES;

    MKCoordinateRegion region = { {0.0, 0.0}, {0.0,0.0}};
    region.center.latitude = *(myTextField);
    region.center.longitude = *(myTextField1);
    region.span.longitudeDelta = 0.01f;
    region.span.latitudeDelta = 0.01f;
    [mapview setRegion:region animated:YES];


    MapPin *ann = [[MapPin alloc] init];
    ann.title = @"Test";
    ann.subtitle = @"test";
    ann.coordinate = region.center;
    [mapview addAnnotation:ann];  
}

我如何才能做到这一点？

Answer 1

MKPointAnnotation *annonation = [[MKPointAnnotation alloc]init];
CLLocationCoordinate2D mycordinate;
mycordinate.latitude = [self.latitude floatValue];
mycordinate.longitude =[self.longitude floatValue];
annonation.coordinate = mycordinate;
[self.mapview addAnnotation:annonation];

在self.latitude存储您的纬度值和在self.longitude中存储您的经度值。

Answer 2

尝试以下代码：

只需从textFields获取文本并从文本中设置纬度，经度浮点值。

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
mapview.showsUserLocation = YES;

MKCoordinateRegion region = { {0.0, 0.0}, {0.0,0.0}};
region.center.latitude = [self.myTextField.text floatValue];
region.center.longitude = [self.myTextField1.text floatValue];
region.span.longitudeDelta = 0.01f;
region.span.latitudeDelta = 0.01f;
[mapview setRegion:region animated:YES];


MapPin *ann = [[MapPin alloc] init];
ann.title = @"Test";
ann.subtitle = @"test";
ann.coordinate = region.center;
[mapview addAnnotation:ann];

}

Answer 3

将public interface IRepo { //Return string because jqgrid need json and if i don't need json //I would process it string GetAll(params object[] parameters); } public class UserRepository : IRepo { public string GetAll(params object[] parameters) { try { //In the dataset there is multiple result set //ErrorCode, Userinfo (Username,AccessCode, UserID), //and multiple Organization DataSet ds; DALUser DALOsztaly = new DALUser(); ds = DALOsztaly.LoginDs(); return JsonConvert.SerializeObject(ds.Tables[0]); } catch (Exception e) { } } ... }从textFields文本转换为浮点值因为你需要浮动值。例：JsonResult j = Json(userrepo.GetAll()) var someObject = JsonConvert.DeserializeObject(loginrepo.GetAll())

如何使用文本字段设置经度和纬度

3 个答案: