我想构建一个应用程序,它还包括在应用程序中显示和保存PDF的可能性,并在桌面视图中显示它们(作为FileSystem),并在点击一个PDF时打开它们.
这是我的重要问题：
1.如何在我的应用程序上保存PDF本地(例如,如果用户可以输入一个URL),以及它将在哪里保存？
2.保存后,如何在表格中显示所有本地存储的文件以打开它们？
由于有几个人要求这个,这相当于
Swift的第一个答案：
//The URL to Save let yourURL = NSURL(string: "http://somewebsite.com/somefile.pdf") //Create a URL request let urlRequest = NSURLRequest(URL: yourURL!) //get the data let theData = NSURLConnection.sendSynchronousRequest(urlRequest,returningResponse: nil,error: nil) //Get the local docs directory and append your local filename. var docURL = (NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory,inDomains: .UserDomainMask)).last as? NSURL docURL = docURL?.URLByAppendingPathComponent( "myFileName.pdf") //Lastly,write your file to the disk. theData?.writetoURL(docURL!,atomically: true)
此外,由于此代码使用同步网络请求,因此我强烈建议将其分派到后台队列中：
dispatch_async(dispatch_get_global_queue(disPATCH_QUEUE_PRIORITY_DEFAULT,0),{ () -> Void in
//The URL to Save
let yourURL = NSURL(string: "http://somewebsite.com/somefile.pdf")
//Create a URL request
let urlRequest = NSURLRequest(URL: yourURL!)
//get the data
let theData = NSURLConnection.sendSynchronousRequest(urlRequest,error: nil)
//Get the local docs directory and append your local filename.
var docURL = (NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory,inDomains: .UserDomainMask)).last as? NSURL
docURL = docURL?.URLByAppendingPathComponent( "myFileName.pdf")
//Lastly,write your file to the disk.
theData?.writetoURL(docURL!,atomically: true)
})
和斯威夫特的第二个问题的答案：
//Getting a list of the docs directory let docURL = (NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory,inDomains: .UserDomainMask).last) as? NSURL //put the contents in an array. var contents = (NSFileManager.defaultManager().contentsOfDirectoryAtURL(docURL!,includingPropertiesForKeys: nil,options: NSDirectoryEnumerationoptions.SkipsHiddenFiles,error: nil)) //print the file listing to the console println(contents)