swift - openInMapsWithLaunchOptions 不起作用？

Question

我正在传递 map 的选项，但这似乎对缩放级别没有任何作用？？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，但从测试来看，如果一个或多个 MKMapItem 似乎 openInMapsWithLaunchOptions() 似乎忽略了 MKLaunchOptionsMapSpanKey 选项> 已添加到 map 中。

以下代码按预期工作，在修改距离参数时正确调整 map 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，一旦将一个 MKMapItem 添加到 map 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)
}