Question

我已在MKMapView上创建了大小为200x200的自定义UIViewController，以显示从当前位置到目标位置的路径。它显示位置和路径。但现在我想解雇这个MKMapView，我希望看到我的UIViewController。所以我在MKMapView的右上角创建了一个按钮，但我无法移除MKMapView。我在按钮的操作上尝试了下面这段代码。

func close() {
    mapView!.removeFromSuperview()
}

我已经声明了这样的地图视图：

    var mapView:MKMapView? = MKMapView()

然后我从viewDidLoad（）中调用了一个方法showMap（），如下所示：

       func showMap() {
    //Setup our Map View
    mapView!.mapType = .Standard
    mapView!.showsUserLocation = true
    mapView!.frame = CGRectMake(topView.frame.origin.x, topView.frame.origin.y, topView.frame.size.width, topView.frame.size.height)
    mapView!.delegate = self
    view.addSubview(mapView!)
}

在此之后，我这样调用了showCloseButtonForMap（）：

      func showCloseButtonForMap() {
    let mapCrossBtn = UIButton()
    mapCrossBtn.frame = CGRectMake(crossBtn.frame.origin.x+20, crossBtn.frame.origin.y+20, crossBtn.frame.size.width, crossBtn.frame.size.height)
    if let image = UIImage(named: "X@2x.png") {
        mapCrossBtn.setImage(image , forState: .Normal)
    }
    mapCrossBtn.backgroundColor = UIColor.blackColor()
    mapCrossBtn.addTarget(topView, action: "close", forControlEvents: .TouchUpInside)
    view.addSubview(mapCrossBtn)
}

这里crossBtn是另一个现在隐藏的按钮。任何帮助将不胜感激。

错误日志：通讯错误：{count = 1，contents = ＆＃34; XPCErrorDescription＆＃34; =＆GT; {length = 22，contents =＆＃34;连接中断＆＃34; } }＆GT;

2015-11-19 15：02：27.390 YEWADemo [2328：235956] - [UIView close]：无法识别的选择器发送到实例0x7fc6d0c32270 2015-11-19 15：02：27.408 YEWADemo [2328：235956] *由于未捕获的异常终止应用程序＆＃39; NSInvalidArgumentException＆＃39;，原因：＆＃39; - [UIView关闭]：无法识别的选择器已发送例如0x7fc6d0c32270＆＃39; * 第一次抛出调用堆栈：（ 0 CoreFoundation 0x0000000107175f45 exceptionPreprocess + 165 1 libobjc.A.dylib 0x0000000108e9cdeb objc_exception_throw + 48 2 CoreFoundation 0x000000010717e56d - [NSObject（NSObject）doesNotRecognizeSelector：] + 205 3 CoreFoundation 0x00000001070cbeea ___ forwarding _ + 970 4 CoreFoundation 0x00000001070cba98 _CF_forwarding_prep_0 + 120 5 UIKit 0x0000000107995e91 - [UIApplication sendAction：to：from：forEvent：] + 92 6 UIKit 0x0000000107b014d8 - [UIControl sendAction：to：forEvent：] + 67 7 UIKit 0x0000000107b017a4 - [UIControl _sendActionsForEvents：withEvent：] + 311 8 UIKit 0x0000000107b008d4 - [UIControl touchesEnded：withEvent：] + 601 9 UIKit 0x0000000107a03ed1 - [UIWindow _sendTouchesForEvent：] + 835 10 UIKit 0x0000000107a04c06 - [UIWindow sendEvent：] + 865 11 UIKit 0x00000001079b42fa - [UIApplication sendEvent：] + 263 12 UIKit 0x000000010798eabf _UIApplicationHandleEventQueue + 6844 13 CoreFoundation 0x00000001070a2011 CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION + 17 14 CoreFoundation 0x0000000107097f3c __CFRunLoopDoSources0 + 556 15 CoreFoundation 0x00000001070973f3 __CFRunLoopRun + 867 16 CoreFoundation 0x0000000107096e08 CFRunLoopRunSpecific + 488 17 GraphicsServices 0x000000010b993ad2 GSEventRunModal + 161 18 UIKit 0x000000010799430d UIApplicationMain + 171 19 YEWADemo 0x0000000106c2cdfd main + 109 20 libdyld.dylib 0x000000010c27a92d start + 1 21 ??? 0x0000000000000001 0x0 + 1 ） libc ++ abi.dylib：以NSException类型的未捕获异常终止

Answer 1

您的mapCrossBtn目标应为self（通常是当前视图控制器），topView没有“close”功能。尝试改变：

  mapCrossBtn.addTarget(topView, action: "close", forControlEvents: .TouchUpInside)

到

mapCrossBtn.addTarget(self, action: "close", forControlEvents: UIControlEvents.TouchUpInside)

从UIViewController

1 个答案: