创建自定义注解视图

没有公共API允许你直接访问弹出窗口中的标签。你需要做的是创建一个MKPinAnnotationView的子类，然后在那里做你想做的任何定制。作为一个例子，

class CustomAnnotationView : MKPinAnnotationView
{
    let selectedLabel:UILabel = UILabel.init(frame:CGRectMake(0, 0, 140, 38))

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

        if(selected)
        {
            // Do customization, for example:
            selectedLabel.text = "Hello World!!"
            selectedLabel.textAlignment = .Center
            selectedLabel.font = UIFont.init(name: "HelveticaBold", size: 15)
            selectedLabel.backgroundColor = UIColor.lightGrayColor()
            selectedLabel.layer.borderColor = UIColor.darkGrayColor().CGColor
            selectedLabel.layer.borderWidth = 2
            selectedLabel.layer.cornerRadius = 5
            selectedLabel.layer.masksToBounds = true

            selectedLabel.center.x = 0.5 * self.frame.size.width;
            selectedLabel.center.y = -0.5 * selectedLabel.frame.height;
            self.addSubview(selectedLabel)
        }
        else
        {
            selectedLabel.removeFromSuperview()
        }
    }
}

其他备注

1.在树状图视图中使用此自定义视图：

func mapView(mapView: MKMapView, viewForAnnotation annotation: MKAnnotation) -> MKAnnotationView? {
    var anno = mapView.dequeueReusableAnnotationViewWithIdentifier("Anno")
    if anno == nil
    {
        anno = CustomAnnotationView.init(annotation: annotation, reuseIdentifier: "Anno")
    }
    return anno;
}

1.由于没有设置注解的title属性，因此您必须自己调用Map视图函数selectAnnotation。将以下内容添加到CustomAnnotationView类：

override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
    mapView?.selectAnnotation(self.annotation!, animated: true)
}

如果您希望在Map上有多个标记：
在setSelected中只返回false（意思是“一直显示所有注解”）。

class DotAnnotationView : MKPinAnnotationView {

    let dot: UILabel = UILabel.init(frame:CGRect(x: 0, y: 0, width: 20, height: 20))

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        _setup()
    }

    override init(annotation: MKAnnotation?, reuseIdentifier: String?) {
        super.init(annotation: annotation, reuseIdentifier: reuseIdentifier)
        _setup()
    }

    override func prepareForReuse() {
        dot.text = "you forgot to set the text value?"
    }

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

    func _setup() {
        dot.textAlignment = .center
        .. etc
    }

}

您可以在mapView#viewFor中为每个注解设置字符串（或其他值，如面板的颜色）。这就像在UITableView中填充单元格一样。

func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {

    let textForThisItem = annotation.title!!
    // or, just use index#of to determine which row this is in your data array
    if annotation.isEqual(mkMap.userLocation) {
        // skip the user-position indicator
        return nil
    }

    var anno = mapView.dequeueReusableAnnotationView(withIdentifier: "anno")

    if anno == nil {
        anno = DotAnnotationView.init(annotation: annotation, reuseIdentifier: "anno")
    }

    (anno as! DotAnnotationView).dot.text = textForThisItem

    return anno
}

最后请注意，如果您非常简单地将CustomAnnotationView的类从MKPinAnnotationView更改为MKAnnotationView，则一切工作都是一样的，但它会替换“所有引脚”，而不仅仅是注解。

更新了最新swift的代码。这是MKPinAnnotationView的新子类，您可以复制粘贴以进行测试：

import UIKit
import MapKit

class CustomAnnotationView : MKPinAnnotationView
{
    let selectedLabel:UILabel = UILabel.init(frame:CGRect(x:0, y:0, width:140, height:38))

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

        if(selected)
        {
            // Do customization, for example:
            selectedLabel.text = "Hello World!!"
            selectedLabel.textAlignment = .center
            selectedLabel.font = UIFont.init(name: "HelveticaBold", size: 15)
            selectedLabel.backgroundColor = UIColor.gray
            selectedLabel.layer.borderColor = UIColor.darkGray.cgColor
            selectedLabel.layer.borderWidth = 2
            selectedLabel.layer.cornerRadius = 5
            selectedLabel.layer.masksToBounds = true

            selectedLabel.center.x = 0.5 * self.frame.size.width;
            selectedLabel.center.y = -0.5 * selectedLabel.frame.height;
            self.addSubview(selectedLabel)
        }
        else
        {
            selectedLabel.removeFromSuperview()
        }
    }
}