MKMapView的比例未显示
MKMapView的比例未显示
提问于 2017-11-13 20:05:40
我正在做一个iOS应用程序。在Xcode 9.1中，我通过
let mapView = MKMapView(frame: CGRect(x: 0, y: 0, width: view.bounds.width, height: view.bounds.height))
mapView.isUserInteractionEnabled = false
mapView.mapType = .satellite
mapView.showsCompass = false
mapView.showsScale = true
view.addSubview(mapView)但是，当我在模拟器中运行它时，没有显示标度，我在日志中得到了三条消息：
无法从边缘嵌入指南针9 无法从边缘9嵌入刻度 无法从拐角4嵌入法律归属
指南针没有显示(如预期的那样)，但如果我将mapView.showsCompass更改为true，它也不会显示。然而，法律联系是显示出来的。我在这里错过了什么？我猜这是关于iOS 11引入的新的安全区域，但我不知道这对我想要覆盖整个屏幕的视图来说有多重要。
回答 3
Stack Overflow用户
回答已采纳
发布于 2017-11-13 23:45:21
在iOS 10或更低的中
正如@Paulw11 11所说，只有在默认情况下缩放时才会显示比例。
In iOS 11
您可以使用scaleVisibility。https://developer.apple.com/documentation/mapkit/mkscaleview/2890254-scalevisibility
let scale = MKScaleView(mapView: mapView)
scale.scaleVisibility = .visible // always visible
view.addSubview(scale)Stack Overflow用户
发布于 2017-12-16 18:48:44
今天的天平也有同样的问题。我要一直都能看到那个天平。我花了好几个小时来解决这个问题。所以我在这里添加代码，以防万一，有人遇到了同样的问题。
有一些提示：
来自这个线程：以编程方式使用安全区布局
这个网站是：带布局锚的无痛苦约束
快乐的编码..。
哈代
// "self.MapOnScreen" refers to the map currently displayed
// check if we have to deal with the scale
if #available(iOS 11.0, *) {
// as we will change the UI, ensure it's on main thread
DispatchQueue.main.async(execute: {
// switch OFF the standard scale (otherwise both will be visible when zoom in/out)
self.MapOnScreen.showsScale = false
// build the view
let scale = MKScaleView(mapView: self.MapOnScreen)
// we want to use autolayout
scale.translatesAutoresizingMaskIntoConstraints = false
// scale should be visible all the time
scale.scaleVisibility = .visible // always visible
// add it to the map
self.MapOnScreen.addSubview(scale)
// get the current safe area of the map
let guide = self.MapOnScreen.safeAreaLayoutGuide
// Activate this array of constraints, which at the time removes leftovers if any
NSLayoutConstraint.activate(
[
// LEFT (I do not want a change if right-to-left language) margin with an offset to safe area
// alternative would be ".leadingAnchor", which switches to the right margin, if right-to-left language is used
scale.leftAnchor.constraint(equalTo: guide.leftAnchor, constant: 16.0),
// right edge will be the middle of the map
scale.rightAnchor.constraint(equalTo: guide.centerXAnchor),
// top margin is the top safe area
scale.topAnchor.constraint(equalTo: guide.topAnchor),
// view will be 20 points high
scale.heightAnchor.constraint(equalToConstant: 20.0)
]
)
})
}Stack Overflow用户
发布于 2022-02-10 13:01:51
目标c相当于：-
if (@available(iOS 11.0, *)) {
// switch OFF the standard scale (otherwise both will be visible when zoom in/out)
self.map.showsScale = false;
// build the view
MKScaleView* scale = [MKScaleView scaleViewWithMapView:self.map];
// we want to use autolayout
scale.translatesAutoresizingMaskIntoConstraints = false;
// scale should be visible all the time
scale.scaleVisibility = MKFeatureVisibilityVisible;// always visible
// add it to the map
[self.view addSubview:scale];
// get the current safe area of the map
UILayoutGuide * guide = self.view.safeAreaLayoutGuide;
// Activate this array of constraints, which at the time removes leftovers if any
[NSLayoutConstraint activateConstraints:
@[
// LEFT (I do not want a change if right-to-left language) margin with an offset to safe area
// alternative would be ".leadingAnchor", which switches to the right margin, if right-to-left language is used
//[scale.leftAnchor constraintEqualToAnchor: guide.centerXAnchor constant: -(scale.frame.size.width/2.0)],
// right edge will be the middle of the map
[scale.rightAnchor constraintEqualToAnchor: guide.centerXAnchor constant: (scale.frame.size.width/2.0)],
// top margin is the top safe area
[scale.bottomAnchor constraintEqualToAnchor: guide.bottomAnchor constant:-self.toolBar.frame.size.height],
// view will be 20 points high
[scale.heightAnchor constraintEqualToConstant: 50.0]
]
];
[self.view bringSubviewToFront:scale];
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原文链接：
https://stackoverflow.com/questions/47272663
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