小编Der*_*ive的帖子

有没有办法拍摄mapView的截图并包含折线？我相信我需要在MKSnapShotter返回的图像上绘制CGPoint,但我不确定如何这样做.

目前的代码

      func takeSnapshot(mapView: MKMapView, withCallback: (UIImage?, NSError?) -> ()) {
    let options = MKMapSnapshotOptions()
    options.region = mapView.region
    options.size = mapView.frame.size
    options.scale = UIScreen.main().scale

    let snapshotter = MKMapSnapshotter(options: options)


    snapshotter.start() { snapshot, error in
        guard snapshot != nil else {
            withCallback(nil, error)
            return
        }

        if let image = snapshot?.image{



            withCallback(image, nil)

            for coordinate in self.area {

                image.draw(at:snapshot!.point(for: coordinate))

            }

        }

    }
}

我目前正在将我的swift 2.3代码转换为swift 3,我在以下行中收到上述错误:

setSharedPassword(nil, account: account, completion: completion)

适当的解决方案是否只是用""代替nil？当我这样做时,错误消失了.我正在寻找解释.请帮忙.

我尝试导入 watchOS 的 SpeechKit 框架并收到错误。有什么办法可以和手表一起使用吗？当我导入 Speechkit 框架时出现错误，提示“没有这样的模块语音”

import WatchKit
import Foundation
import Speech

class SpeechInterfaceController: WKInterfaceController, SFSpeechRecognizerDelegate {

override func awake(withContext context: Any?) {
    super.awake(withContext: context)

    // Configure interface objects here.
}

override func willActivate() {
    // This method is called when watch view controller is about to be visible to user
    super.willActivate()
}

override func didDeactivate() {
    // This method is called when watch view controller is no longer visible
    super.didDeactivate()
}

}

我创建了一个名为RegistrationButton的自定义UIButton.我目前正在尝试允许用户在三个按钮之间进行选择.选择按钮后,背景颜色和文本将发生变化.以下是IBAction的外观:

  @IBAction func didTapBUtton(_ sender: UIButton) {


  switch sender {
    case studentButton:
        studentButton.selected()
        professionalButton.notSelected()
        entrepreneurhsip.notSelected()
        break
    case professionalButton:
        studentButton.notSelected()
        professionalButton.selected()
        entrepreneurhsip.notSelected()
        break
    case entrepreneurhsipButton:
        studentButton.notSelected()
        professionalButton.notSelected()
        entrepreneurhsip.selected()
        break
    default:
        break
    }
}

这是我的自定义UIButton类的方法:

import UIKit

class RegistrationButton: UIButton {


override func awakeFromNib() {
    super.awakeFromNib()
    addBorder()

}

required init(coder:NSCoder) {
    super.init(coder:coder)!
}

func addBorder(){
    self.layer.borderColor = UIColor.white.cgColor
    self.layer.borderWidth = 1
}

func selected(){
     self.backgroundColor = .white

    self.setTitleColor(UIColor(red:67,green:204,blue:144,alpha:1), for: .normal)
}
func notSelected(){

    self.backgroundColor = UIColor(red:67,green:204,blue:144,alpha:1)


    self.setTitleColor(UIColor.white, for: .normal)
}

}

但是,当我选择一个按钮时,所有背景都变为白色.