Question

我传递了地图的选项，但这似乎没有对缩放级别做任何事情？它保持相同的低缩放级别。我错过了什么？

func openMapForPlace() {
    let regionDistance:CLLocationDistance = 10000
    var coordinates = CLLocationCoordinate2DMake(detailItem!.geoLatitude, detailItem!.geoLongitude)
    let regionSpan = MKCoordinateRegionMakeWithDistance(coordinates, regionDistance, regionDistance)
    var options = [
        MKLaunchOptionsMapCenterKey: NSValue(MKCoordinate: regionSpan.center),
        MKLaunchOptionsMapSpanKey: NSValue(MKCoordinateSpan: regionSpan.span)
    ]
    var placemark = MKPlacemark(coordinate: coordinates, addressDictionary: nil)
    var mapItem = MKMapItem(placemark: placemark)
    mapItem.name = detailItem!.cityName
    mapItem.openInMapsWithLaunchOptions(options)
}

Answer 1

Apple的文档没有提到它，但是从测试来看，如果向地图添加了一个或多个openInMapsWithLaunchOptions()，MKLaunchOptionsMapSpanKey似乎会忽略MKMapItem选项。

以下代码按预期工作，修改距离参数时正确调整地图缩放（尝试使用1000和10000000，以查看差异）：

func openMapForPlace() {
    let regionDistance: CLLocationDistance = 10000000
    let coordinates = CLLocationCoordinate2DMake(40, 0)
    let regionSpan = MKCoordinateRegionMakeWithDistance(coordinates, regionDistance, regionDistance)
    let options = [
        MKLaunchOptionsMapCenterKey: NSValue(MKCoordinate: regionSpan.center),
        MKLaunchOptionsMapSpanKey: NSValue(MKCoordinateSpan: regionSpan.span)
    ]

    MKMapItem.openMapsWithItems([], launchOptions: options)
}

但是，只要将一个MKMapItem添加到地图中，缩放就会停止工作。

func openMapForPlace() {
    let regionDistance: CLLocationDistance = 10000000
    let coordinates = CLLocationCoordinate2DMake(40, 0)
    let regionSpan = MKCoordinateRegionMakeWithDistance(coordinates, regionDistance, regionDistance)
    let options = [
        MKLaunchOptionsMapCenterKey: NSValue(MKCoordinate: regionSpan.center),
        MKLaunchOptionsMapSpanKey: NSValue(MKCoordinateSpan: regionSpan.span)
    ]

    let placemark = MKPlacemark(coordinate: coordinates, addressDictionary: nil)
    let mapItem = MKMapItem(placemark: placemark)
    mapItem.name = "Test"

    MKMapItem.openMapsWithItems([mapItem], launchOptions: options)
}

openInMapsWithLaunchOptions不起作用？

1 个答案: