MKMapView 的比例尺未显示
MKMapView's scale is not shown
我正在做 iOS 申请。在 Xcode 9.1 中,我通过
创建了一个 MKMapView
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 时,比例没有显示,我在日志中收到三条消息:
Could not inset compass from edges 9
Could not inset scale from edge 9
Could not inset legal attribution from corner 4
指南针未显示(如预期),但如果我将 mapView.showsCompass
更改为 true
也不会显示。但是,显示的是合法 link。我在这里错过了什么?我猜这与 iOS 11 引入的新安全区域有关,但我看不出这对于我想要覆盖整个屏幕的视图有多重要。
在 iOS 10 或更低
正如@Paulw11 所说,默认情况下仅在缩放时显示比例。
在iOS11
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)
今天的秤也有同样的问题。我希望那个比例一直可见。花了我几个小时来解决它。所以我在这里添加代码,以防有人 运行 遇到同样的问题。
得到一些提示:
来自此线程:
和这个网站:Pain Free Constraints with Layout Anchors
编码愉快...
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)
]
)
})
}
Objective 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];
}
我正在做 iOS 申请。在 Xcode 9.1 中,我通过
创建了一个 MKMapViewlet 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 时,比例没有显示,我在日志中收到三条消息:
Could not inset compass from edges 9
Could not inset scale from edge 9
Could not inset legal attribution from corner 4
指南针未显示(如预期),但如果我将 mapView.showsCompass
更改为 true
也不会显示。但是,显示的是合法 link。我在这里错过了什么?我猜这与 iOS 11 引入的新安全区域有关,但我看不出这对于我想要覆盖整个屏幕的视图有多重要。
在 iOS 10 或更低
正如@Paulw11 所说,默认情况下仅在缩放时显示比例。
在iOS11
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)
今天的秤也有同样的问题。我希望那个比例一直可见。花了我几个小时来解决它。所以我在这里添加代码,以防有人 运行 遇到同样的问题。
得到一些提示:
来自此线程:
和这个网站:Pain Free Constraints with Layout Anchors
编码愉快...
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)
]
)
})
}
Objective 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];
}