Question

如何放大并居中用户位置“点”？我已经尝试过在这里和其他网站上找到的所有内容，但我似乎无法做到正确。

请帮助我！

编辑：我试图在viewDidAppear中实现这行代码。我在一个旧的线程中找到了它，但它似乎不再起作用了......

protected List<string> clickOrderList = new List<string>();

private void Form1_Load(object sender, EventArgs e)
{
    // Populate the checked ListBox
    this.checkedListBox1.Items.Add("Row1");
    this.checkedListBox1.Items.Add("Row2");
    this.checkedListBox1.Items.Add("Row3");
    this.checkedListBox1.Items.Add("Row4");
}

private void checkedListBox1_ItemCheck(object sender, ItemCheckEventArgs e)
{
    if (sender != null && e != null)
    {
        // Get the checkListBox selected time and it's CheckState
        CheckedListBox checkListBox = (CheckedListBox)sender;
        string selectedItem = checkListBox.SelectedItem.ToString();

        // If curent value was checked, then remove from list
        if (e.CurrentValue == CheckState.Checked &&
            clickOrderList.Contains(selectedItem))
        {
            clickOrderList.Remove(selectedItem);
        }
        // else if new value is checked, then add to list
        else if (e.NewValue == CheckState.Checked &&
            !clickOrderList.Contains(selectedItem))
        {
            clickOrderList.Insert(0, selectedItem);
        }
    }
}

private void ShowClickOrderButton_Click(object sender, EventArgs e)
{
    StringBuilder sb = new StringBuilder();
    foreach (string s in clickOrderList)
    {
        sb.AppendLine(s);
    }

    MessageBox.Show(sb.ToString());
}

Answer 1

我以编程方式创建了地图，而不是使用MapKit View，它完美无缺！

以下是代码：

    [super viewDidLoad];

self.mapView = [[MKMapView alloc] initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width, self.view.bounds.size.height)];
[self.mapView setShowsUserLocation:YES];
[self.mapView setDelegate:self];
[self.view addSubview:self.mapView];
[mapView setMapType:MKMapTypeHybrid];

}

#pragma mark - MKMapViewDelegate Methods

- (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation {

[self.mapView setRegion:MKCoordinateRegionMake(userLocation.coordinate, MKCoordinateSpanMake(0.1f, 0.1))animated:YES];

}

Answer 2

您是否尝试过为地图设置区域，我列出了所有步骤，万一您错过了什么，让我知道您缺少哪些，我会提供代码。

viewDidLoad或viewDidAppear以适合您的流量为准。初始化地图并在didUpdateUserLocation中监听位置更新后，您必须启动地图并挂钩更新位置，您需要像这样设置区域

-(void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation
{
    //Mapview is your map on display,      
    CLLocationCoordinate2D coord = self.mapView.userLocation.coordinate;

    //Create a region with a 1000x1000 meter around the user location
    MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(coord, 1000, 1000);

    //Set the region of your mapview so the user location is in center and update
    [self.mapView setRegion:viewRegion];

}

如何放大和居中用户位置（Objective-C）

2 个答案: