Question

我设计了一个自定义注释，视图看起来很好。但是在视图中有一个按钮，当我点击它时，没有发生。它应该在日志中打印一些内容。这是Custom Annotation类中的代码。

import UIKit
import MapKit
import CoreLocation
import CoreData


class CustomAnnotation: MKPinAnnotationView, MKMapViewDelegate, CLLocationManagerDelegate {

let firmaLabel : UILabel = UILabel.init(frame:CGRect(x: 0, y: -50, width: 200, height: 50))
let infoButton = UIButton(type: .detailDisclosure)


override func setSelected(_ selected: Bool, animated: Bool)
{
    super.setSelected(true, animated: animated)


        firmaLabel.textAlignment = .center
        firmaLabel.textColor = UIColor.white
        firmaLabel.font = UIFont.init(name: "Trebuchet MS", size: 20)
        firmaLabel.backgroundColor = UIColor.black
        firmaLabel.layer.borderColor = UIColor.darkGray.cgColor
        firmaLabel.layer.cornerRadius = 5
        firmaLabel.layer.masksToBounds = true

        infoButton.frame = CGRect(x: -50, y: -50, width: 50, height: 50)
        infoButton.backgroundColor = UIColor.red
        infoButton.layer.borderColor = UIColor.darkGray.cgColor
        infoButton.layer.cornerRadius = 5
        infoButton.layer.masksToBounds = true
        infoButton.setTitle(">", for: UIControlState.normal)

//The code below is the way I imagine it should make it work??

        infoButton.addTarget(self, action: #selector(btnClicked(_:)), for: UIControlEvents.touchUpInside)

        firmaLabel.text = "Hello"
        self.addSubview(firmaLabel)

        self.addSubview(infoButton)

}

func btnClicked (_: UIButton) {
    print("Hello world")
  }
}

这是我运行项目时的样子。它看起来应该是

我以这种方式在Viewcontroller中调用自定义注释

func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
    if annotation is MKUserLocation
    {
        return nil
    }
    var annotationView = self.mapView.dequeueReusableAnnotationView(withIdentifier: "Pin")
    if annotationView == nil{
        annotationView = CustomAnnotation(annotation: annotation, reuseIdentifier: "Pin")
        annotationView?.canShowCallout = false
    } else {
        annotationView?.annotation = annotation
    }

    return annotationView
}

Answer 1

问题是，您正在创建一个MKPinAnnotation视图，并在其上添加两个额外的视图。你应该使用一个标注视图。在您现有的代码中，鼠标点击只会通过＆＃39;在引脚上，尝试向下移动按钮，使其覆盖引脚，您将看到选择器（需要更新）将被调用。

如果您只想快速显示按钮，请考虑将其添加为这样的标注附件视图（在ViewCtrl中）：

if annotationView == nil{
        annotationView = CustomAnnotation(annotation: annotation, reuseIdentifier: "Pin") //Might as well be MKPinAnnotationView
        annotationView?.canShowCallout = true

        let infoButton = UIButton(type: .detailDisclosure)

        infoButton.frame = CGRect(x: 0, y: 0, width: 50, height: 50)
        infoButton.backgroundColor = UIColor.red
        infoButton.layer.borderColor = UIColor.darkGray.cgColor
        infoButton.layer.cornerRadius = 5
        infoButton.layer.masksToBounds = true

        infoButton.addTarget(self, action:#selector(self.buttonClicked), for: .touchUpInside)

        annotationView?.leftCalloutAccessoryView = infoButton

    }

然后记得添加动作：

    func buttonClicked() {
    print("Button Clicked")
}

结果：

编辑：看一下Apples＆＃34; MapCallouts＆＃34;示例代码，它们为iOS和macOS显示不同类型的注释。非常有用！

自定义注释中的按钮不会响应

1 个答案: