ios - Initializing AVAudioPlayer to be used in more than one function -


usual avaudioplayer tutorials online creates avaudioplayer within function play , stop functions of avaudioplayer object aren't available object directly other functions. problem function stop sound avaudioplayer. seems pretty simple initializing objects @ top of class in hopes accessible in swift3 init function avaudioplayer includes throw , parameter sound file. swift doesn't allow use instance member within property initializer i'm stuck on thought process of how written.

the error i'm running @ point not being allowed use instance member in property initializer when creating "backgroundmusicplayer":

import uikit import avfoundation  class madliboneviewcontroller: uiviewcontroller, uitextfielddelegate {      @iboutlet weak var theplace: uitextfield!     @iboutlet weak var theverb: uitextfield!     @iboutlet weak var thenumber: uitextfield!     @iboutlet weak var thetemplate: uitextview!     @iboutlet weak var thestory: uitextview!     @iboutlet weak var generatestorybutton: uibutton!     @iboutlet weak var proceedtonextmadlib: uibutton!     //var backgroundmusicplayer = avaudioplayer()      var error:nserror?      var path = bundle.main.path(forresource: "bensound-cute", oftype: "mp3")      var url: nsurl {         return nsurl(fileurlwithpath: path!)     }      var backgroundmusicplayer: avaudioplayer = try avaudioplayer(contentsof: url url, error: &error)          @ibaction func createstory(_ sender: anyobject) {         thestory.text=thetemplate.text     thestory.text=thestory.text.replacingoccurrences(of: "<place>", with: theplace.text!)         thestory.text=thestory.text.replacingoccurrences(of: "<verb>", with: theverb.text!)         thestory.text=thestory.text.replacingoccurrences(of: "<number>", with: thenumber.text!)          generatestorybutton.ishidden=true         proceedtonextmadlib.ishidden=false      }      @ibaction func shownextstory(_ sender: anyobject) {          view.backgroundcolor=uicolor.green          let storyboard : uistoryboard = uistoryboard(name: "main", bundle:nil)         let resultviewcontroller = storyboard.instantiateviewcontroller(withidentifier: "madlibtwoviewcontroller") as! madlibtwoviewcontroller         self.present(resultviewcontroller, animated:true, completion:nil)      }      @ibaction func hidekeyboard(_ sender: anyobject) {         theplace.resignfirstresponder()         theverb.resignfirstresponder()         thenumber.resignfirstresponder()         thetemplate.resignfirstresponder()     }     override func viewdidload() {         super.viewdidload()         proceedtonextmadlib.ishidden=true         view.backgroundcolor = uicolor.purple           // additional setup after loading view.         self.theverb.delegate = self         self.theplace.delegate = self         self.thenumber.delegate = self      }      func textfieldshouldreturn(_ textfield: uitextfield) -> bool {         self.view.endediting(true)         return false     }      override func didreceivememorywarning() {         super.didreceivememorywarning()         // dispose of resources can recreated.     }  }

you need use lazy initialisation/instantiation that. in case need do.

lazy var player: avaudioplayer = {     [unowned self] in     {         return try avaudioplayer.init(contentsof: self.url)     }     catch {         return avaudioplayer.init()     }  }()

for more lazy initialisation this read. interesting thing in case initialiser throws. think this forum discussion helpful have slight idea.


Comments

Post a Comment

Popular posts from this blog

sql server - Cannot query correctly (MSSQL - PHP - JSON) -

i have little problem on project. , turns out query result returns nothing when value of first name or last name has 'ñ' in it. here's code config.php: <?php ini_set('mssql.charset', 'utf-8'); header('content-type: text/html; charset=utf-8'); $servername = "192.168.1.21"; /* ip add of db server */ $connection = array("database" => "db", "uid" => "?", "pwd" => "***"); $conn = sqlsrv_connect($servername, $connection); if(!$conn){ echo "connection not established."; die(print_r(sqlsrv_errors(), true)); } ?> myquery: $idnumber = $_post["idnum"]; $response = array(); $query2 = "select clname, cfname, cmname, cqualifier student cidno = '$idnumber'"; try{ $stmt2 = sqlsrv_query($conn, $query2); } catch(pdoexeption $ex){ $response["success"] = 0; $response["message"] = "d...
Read more

php - trouble displaying mysqli database results in correct order -

i have table in database stores events , date expire. want display events on website display current events first expired events after? i have tried following sql $sql = "select noticeid, notice, noticedesc, noticeimg, noticedate, expirydate tbl_notices group noticeid ,expired order expirydate asc"; but returns expired results first due expirydate being ordered asc in query. my tbl_notice structure looks this noticeid => int(4) notice => varchar(100) noticedesc => text noticedate => timestamp noticeimg => varchar(40) expirydate => datetime expired => int(1) 0 current or 1 expired my php code is $sql = "select noticeid, notice, noticedesc, noticeimg, noticedate, expirydate tbl_notices group noticeid ,expired order expirydate asc"; $result = mysqli_query($conn,$sql); if ($result->num_rows > 0) { // output data of each row while($row = $result->fetch_assoc()) { ...
Read more

C++ Linked List -

i trying create linked list download txt file , use linked list handle file line line. when handling downloaded linked list operations performed on such text editor would. encountering problems however. seems "node(string value)" section of code has wrong though original node() declaration no arguments passes. unable figure out quite is. node.h class node { public: node(); node(string value); void setnext(node *nextnode); // allows user set "next" pointer of node points friend class linkedlist; private: string data; // data box node* next; // pointer box }; node.cpp # include <string> # include "node.h" using namespace std; node::node() { data = ""; next = null; } node::node(string value) { data = value; next = null; } void node::setnext(node *nextnode) // allows user set "next" pointer of node points { this->next = nextnode; } your #include <string> ...
Read more