如何显示MapKit指南针? [英] How to show MapKit compass?

问题描述

当前，只有用户应用旋转手势时，才会显示指南针.否则，指南针将被隐藏.

Currently the compass only get's shown if a User applies a rotate-gesture. Otherwise the compass is hidden.

但是，如果我的以下两个愿望都能实现，那就太好了！

But it would be nice if my two wishes below were fulfilled!

• 是否可以始终显示指南针?
• 如何使用Swift显示/隐藏指南针视图?

推荐答案

您可以在iOS 11中使用新的

You can do this quite easily in iOS 11 by using the new MKCompassButton class.

您需要创建 MKCompassButton 的实例并将其添加到地图视图中.然后，您可以将其 compassVisibility 属性设置为以下其中一项:

You need to create an instance of MKCompassButton and add it to your map view. You can then set its compassVisibility property to one of:

• .visible -始终可见
• .从不-从不可见
• .adaptive -仅当地图从北/上方向旋转离开时，指南针才可见.

• .visible - always visible
• .never - never visible
• .adaptive - the compasss is only visible if the map is rotated away from a North/up orientation.

如果在属性中保留对指南针的引用，则可以根据需要更改其可见性:

If you keep a reference to the compass in a property you can change its visibility as you need:

mapview.showsCompass = false  // Hide built-in compass

compassButton = MKCompassButton(mapView: mapview)   // Make a new compass
compassButton.compassVisibility = .visible          // Make it visible

mapview.addSubview(compassButton) // Add it to the view

// Position it as required

compassButton.translatesAutoresizingMaskIntoConstraints = false
compassButton.trailingAnchor.constraint(equalTo: mapview.trailingAnchor, constant: -12).isActive = true
compassButton.topAnchor.constraint(equalTo: mapview.topAnchor, constant: 12).isActive = true

不幸的是，对于以前的iOS版本，没有简单的解决方案.我已经看到一些建议，其中涉及浏览地图视图的子视图以尝试并找到指南针视图，但结果似乎参差不齐.

Unfortunately, for prior versions of iOS there is no simple solution. I have seen suggestions that involve looking through the map view's subviews to try and find the compass view but there seems to be mixed results.

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