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我開發了一個應用程序，其中一個功能是查看從服務器下載的視頻。我使用Alamofire訪問網絡，這是我的代碼：下載並在iPad或iPhone上播放的視頻的罕見問題
func GetVideoFiedMedia(videoFiedData: VideofiedVideo?, completionHandler: (NSURL?, NSError?) ->()) {
var result: NSURL? = nil;
let parameters : [ String : AnyObject] = [
"CnxID": (videoFiedData?.cnxID!)!,
"TaskNum": (videoFiedData?.taskNum!)!,
"Ev_File": (videoFiedData?.evFile!)!
]
let headers = [
"Content-Type": "application/json"
]
let urlAux = "https://xxxxxx/xxxxx/xxxxx.svc/VideoMedia?";
Alamofire.request(.POST, urlAux, parameters: parameters, headers: headers, encoding: .JSON)
.validate()
.responseString { response in
switch response.result {
case .Success:
if let JSON = response.result.value {
do{
let data: NSData = JSON.dataUsingEncoding(NSUTF8StringEncoding)!
let decodedJson = try NSJSONSerialization.JSONObjectWithData(data, options: .MutableLeaves) as! NSDictionary
let dObj = decodedJson["d"] as! NSDictionary;
let resultSet = dObj["Media"] as? NSArray;
if(resultSet != nil){
let stringsData = NSMutableData();
for item in resultSet! {
let byte = item as! Int;
var char = UnicodeScalar(byte);
stringsData.appendBytes(&char, length: 1)
}
var destinationUrl: NSURL? = nil;
let documentsUrl = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask).first! as NSURL;
let fileName = "msavid.mp4";
destinationUrl = documentsUrl.URLByAppendingPathComponent(fileName)
let fileMangr = NSFileManager.defaultManager()
var fileHandle = NSFileHandle.init(forWritingAtPath: (destinationUrl?.path!)!)
if(fileHandle == nil){
fileMangr.createFileAtPath((destinationUrl?.path!)!, contents: stringsData, attributes: nil)
fileHandle = NSFileHandle.init(forWritingAtPath: (destinationUrl?.path!)!)
}
if(fileHandle != nil){
fileHandle?.seekToEndOfFile();
fileHandle?.writeData(stringsData);
fileHandle?.closeFile();
}
result = destinationUrl;
completionHandler(result, nil);
}
}catch{
result = nil;
completionHandler(result, nil);
}
}
case .Failure(let error):
completionHandler(result, error);
}
}
}
當我得到了我以這種方式發揮它的視頻NSURL：
_ = self.manager.GetVideoFiedMedia(videoFiedItem, completionHandler: { responseObject, error in
if(responseObject != nil){
var sendSegue = false;
self.nsurl = responseObject;
if NSFileManager().fileExistsAtPath(responseObject!.path!) == true {
if(sendSegue == false){
self.performSegueWithIdentifier("sureViewSegue", sender: nil);
self.nsurl = nil;
sendSegue = true;
MBProgressHUD.hideAllHUDsForView(self.view, animated: true);
}
}else{
MBProgressHUD.hideAllHUDsForView(self.view, animated: true)
let alert = UIAlertController(title: "Alert", message: "We have problem to download the media data, please try again later.", preferredStyle: UIAlertControllerStyle.Alert);
alert.addAction(UIAlertAction(title: "Close", style: UIAlertActionStyle.Default, handler: nil));
self.presentViewController(alert, animated: true, completion: nil);
}
}else{
MBProgressHUD.hideAllHUDsForView(self.view, animated: true)
let alert = UIAlertController(title: "Alert", message: "We have problem to download the media data, please try again later.", preferredStyle: UIAlertControllerStyle.Alert);
alert.addAction(UIAlertAction(title: "Close", style: UIAlertActionStyle.Default, handler: nil));
self.presentViewController(alert, animated: true, completion: nil);
}
})
我進行推的SEGUE一個AVPlayerViewController。
當我測試使用iOS模擬器的方法時，一切似乎都正常工作，問題出現在我嘗試在真實設備（iPhone或iPad）中使用該功能時視頻未顯示出來，帶有此符號的AVPlayerViewController無法再現視頻。
請任何幫助，我無法弄清楚是什麼原因造成的問題。