如何使用Watch Connectivity传输UIImage

Question

我怎么能转移的UIImage过WatchConnecitivity从iPhone到苹果手表只加载在手机上无需用户交互,而且由于手表它调用编程.我需要这个,因为用于创建UIImageWatchkit API中不可用的使用逻辑的图像处理,所以它必须从手机创建.我似乎有一些使用Watch Connectivity的例子:

func startSession() {
    session?.delegate = self
    session?.activateSession()
}

但是,我对手表套件和iOS一般都很陌生,对于如何使用这个会话管理器很困惑,特别是从手表到设备,而不是像我在网上的例子中看到的那样.有人可以提供一个如何在手表和手机上执行此操作的示例,以便UIImage从手表上拨打电话吗？

Answer 1

要在iPhone和Apple Watch之间传输文件,您应使用Watch Connectivity,WCSession以便正确处理通信.您可以发送UIImage作为NSData使用didReceiveMessageData的委托方法WCSessionDelegate.

你应该知道的第一件事就是将你转变UIImage为NSData反之亦然.您可以使用以下代码:

如果PNG图像

let image = UIImage(named: "nameOfYourImage.jpg")
let data = UIImagePNGRepresentation(image)

如果JPG图像

let image = UIImage(named: "nameOfYourImage.jpg")
let data = UIImageJPEGRepresentation(image, 1.0)

然后您可以使用WCSession以下方式发送消息:

ViewController.swift

class ViewController: UIViewController, WCSessionDelegate {

   override func viewDidLoad() {
       super.viewDidLoad()
       // Do any additional setup after loading the view, typically from a nib.

       if WCSession.isSupported() {
           WCSession.defaultSession().delegate = self
           WCSession.defaultSession().activateSession()
       }

       let image = UIImage(named: "index.jpg")!

       let data = UIImageJPEGRepresentation(image, 1.0)

       WCSession.defaultSession().sendMessageData(data!, replyHandler: { (data) -> Void in
           // handle the response from the device

        }) { (error) -> Void in
              print("error: \(error.localizedDescription)")

       }
   }

   override func didReceiveMemoryWarning() {
       super.didReceiveMemoryWarning()
       // Dispose of any resources that can be recreated.
   }
}

InterfaceController.swift

import WatchKit
import Foundation
import WatchConnectivity


class InterfaceController: WKInterfaceController, WCSessionDelegate {

   override func awakeWithContext(context: AnyObject?) {
       super.awakeWithContext(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()

       if WCSession.isSupported() {
           WCSession.defaultSession().delegate = self
           WCSession.defaultSession().activateSession()
       } 
   }

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

   func session(session: WCSession, didReceiveMessageData messageData: NSData, replyHandler: (NSData) -> Void) {

       guard let image = UIImage(data: messageData) else {
           return
       }

       // throw to the main queue to upate properly
       dispatch_async(dispatch_get_main_queue()) { [weak self] in
           // update your UI here
       }

      replyHandler(messageData)
   }
}

在上面的代码中,当你打开ViewController它发送时UIImage,上面的例子仅用于学习目的,你必须以更合适的方式处理它,关于项目的复杂性.

我希望这对你有帮助.