MapKit Demo: 地圖加Annotation以及畫線

MapViewController.swift

//
//  ViewController.swift
//  NewMapKit
//
//  Created by 默司 on 2016/9/20.
//  Copyright © 2016年 默司. All rights reserved.
//

import UIKit
import MapKit

class MapViewController: UIViewController, MKMapViewDelegate {

    let mapView = MKMapView()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        
        self.view.addSubview(mapView)
        self.mapView.frame = self.view.frame
        
        //mapview 基本設定
        self.mapView.showsUserLocation = true
        self.mapView.delegate = self
        
        //加入兩個annotation
        let annotationA = MKPointAnnotation()
        annotationA.coordinate = CLLocationCoordinate2DMake(25.061581, 121.551035)
        let annotationB = MKPointAnnotation()
        annotationB.coordinate = CLLocationCoordinate2DMake(25.049335, 121.524728)
        
        self.mapView.addAnnotation(annotationA)
        self.mapView.addAnnotation(annotationB)
        
        //加入polyline overlay
        let polyline = MKPolyline(coordinates: [annotationA.coordinate, annotationB.coordinate], count: 2)
        
        self.mapView.add(polyline)
        
    }
    
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        
        let center = CLLocationCoordinate2DMake(25.052756, 121.543997)
        let region = MKCoordinateRegionMakeWithDistance(center, 1000, 1000)
        
        self.mapView.setRegion(region, animated: true)
    }

    func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
        //繪製AnnotationView
        if let v = mapView.dequeueReusableAnnotationView(withIdentifier: "Pin") as? MKPinAnnotationView {
            
            v.annotation = annotation
            
            return v
        }
        
        return MKPinAnnotationView(annotation: annotation, reuseIdentifier: "Pin")
    }
    
    func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {
        //決定如何render overlay
        let render = MKPolylineRenderer(overlay: overlay)
        render.strokeColor = UIColor.red
        render.lineWidth = 3.0
        return render
    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}