[英]Chromecast objectForKey with Swift
I started to work with Google Cast API in iOS and I'm trying to get it to work with Apple new programming language Swift. 我开始在iOS中使用Google Cast API,并试图使其与Apple新的编程语言Swift一起使用。 I used as a reference Google Sample apps at https://github.com/googlecast/CastVideos-ios .
我在https://github.com/googlecast/CastVideos-ios上将 Google Sample应用作为参考。 The problem is when it connect to a cast device and it gets here..
问题是当它连接到投射设备并到达此处时。
func deviceManager(deviceManager: GCKDeviceManager!, didConnectToCastApplication applicationMetadata: GCKApplicationMetadata!, sessionID: String!, launchedApplication: Bool) {
NSLog("application has launched \(launchedApplication)")
mediaControlChannel = GCKMediaControlChannel.alloc()
mediaControlChannel.delegate = self
self.deviceManager.addChannel(mediaControlChannel)
mediaControlChannel.requestStatus()
NSLog("waarde van requestStatus is: \(mediaControlChannel.requestStatus())")
}
It launches and the NSLog is giving me this "application has launched : false" and then I get the following error.. "Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'setObjectForKey: key cannot be nil'" I have looked in the Google Cast iOS class documentation and I found this https://developers.google.com/cast/docs/reference/ios/interface_g_c_k_media_metadata 它启动,NSLog给我这个“应用程序已启动:false” ,然后出现以下错误。。 “由于未捕获的异常'NSInvalidArgumentException',正在终止应用程序,原因:'setObjectForKey:键不能为零'”在Google Cast iOS类文档中,我找到了这个https://developers.google.com/cast/docs/reference/ios/interface_g_c_k_media_metadata
Then I found this in that class 然后我在那个班上发现了这个
- (id) objectForKey: (NSString *) key
Reads the value of a field.
So my thought was that I have to put something here.. 所以我的想法是我必须在这里放些东西。
@IBAction func sendVideo(sender: AnyObject) {
NSLog("Cast video")
if deviceManager == nil {
var alert = UIAlertController(title: "Not connected", message: "Please connect to Cast device", preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil))
presentViewController(alert, animated: true, completion: nil)
return
}
// Define media metadata
var metaData = GCKMediaMetadata(metadataType: GCKMediaMetadataType.User)
metaData.setString("Bug Bunny!", forKey: kGCKMetadataKeyTitle)
metaData.setString("dit is allemaal maar was subtitles dasdsadhjsdfgjkkHDHSAGDH", forKey: kGCKMetadataKeySubtitle)
var url = NSURL(string: "http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/images/BigBuckBunny.jpg")
metaData.addImage(GCKImage(URL: url, width: 480, height: 360))
var mediaInformation = GCKMediaInformation(contentID: "http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/images/BigBuckBunny.jpg", streamType: .None, contentType: "video/mp4", metadata: metaData as GCKMediaMetadata, streamDuration: 0, customData: nil)
NSLog("waarde van mediainformation is : \(mediaInformation)")
mediaControlChannel.loadMedia(mediaInformation, autoplay: true, playPosition: 0)
}
As Jesper pointed out, the GCKMediaControlChannel.alloc()
line is wrong. 正如Jesper指出的那样,
GCKMediaControlChannel.alloc()
行是错误的。
Here's a Swift ported didConnectToCastApplication
method (from the Google CastVideos-ios example) that I know works: 这是我知道可以使用的Swift移植的
didConnectToCastApplication
方法(来自Google CastVideos-ios示例):
func deviceManager(deviceManager: GCKDeviceManager!, didConnectToCastApplication applicationMetadata: GCKApplicationMetadata!, sessionID: String!, launchedApplication: Bool) {
self.isReconnecting = false
self.mediaControlChannel = GCKMediaControlChannel()
self.mediaControlChannel?.delegate = self
self.receiverCommandChannel = ChromecastCommandChannel()
self.receiverCommandChannel?.delegate = self
self.deviceManager?.addChannel(self.mediaControlChannel)
self.deviceManager?.addChannel(self.receiverCommandChannel)
self.mediaControlChannel?.requestStatus()
self.receiverCommandChannel?.requestStatus()
self.applicationMetadata = applicationMetadata
self.updateCastIconButtonStates()
if let delegate = self.delegate {
if let device = self.selectedDevice {
delegate.didConnectToDevice(device)
} else {
NSLog("Can not connect to device as no selected device is set")
}
} else {
NSLog("Can not run didConnectToDevice as delegate is not set")
}
// Store sessionId in case of restart
let defaults = NSUserDefaults.standardUserDefaults()
defaults.setObject(sessionID, forKey: "lastCCSessionId")
if let deviceId = self.selectedDevice?.deviceID {
defaults.setObject(deviceId, forKey: "lastCCDeviceId")
}
defaults.synchronize()
}
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