Added MIDI to Audio File Example with Soundfonts for iOS in reference to #171

Examples/iOS/MIDI to Audio iOS/MIDI to Audio iOS-Bridging-Header.h

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+//
+//  Use this file to import your target's public headers that you would like to expose to Swift. (Needed for Swift only)
+//
+
+#import "MIKMIDIToAudioExporter.h"
+#import "MIKOfflineMIDISynthesizer.h"

Examples/iOS/MIDI to Audio iOS/MIDI to Audio iOS/AppDelegate.swift

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+import UIKit
+
+@UIApplicationMain
+class AppDelegate: UIResponder, UIApplicationDelegate {
+
+    var window: UIWindow?
+
+
+    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
+        // Override point for customization after application launch.
+        return true
+    }
+
+    func applicationWillResignActive(_ application: UIApplication) {
+        // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
+        // Use this method to pause ongoing tasks, disable timers, and invalidate graphics rendering callbacks. Games should use this method to pause the game.
+    }
+
+    func applicationDidEnterBackground(_ application: UIApplication) {
+        // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
+        // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
+    }
+
+    func applicationWillEnterForeground(_ application: UIApplication) {
+        // Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
+    }
+
+    func applicationDidBecomeActive(_ application: UIApplication) {
+        // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
+    }
+
+    func applicationWillTerminate(_ application: UIApplication) {
+        // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
+    }
+
+
+}
+

Examples/iOS/MIDI to Audio iOS/MIDI to Audio iOS/Assets.xcassets/AppIcon.appiconset/Contents.json

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+{
+  "images" : [
+    {
+      "idiom" : "iphone",
+      "size" : "20x20",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "20x20",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "29x29",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "29x29",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "40x40",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "40x40",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "60x60",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "60x60",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

Examples/iOS/MIDI to Audio iOS/MIDI to Audio iOS/Base.lproj/LaunchScreen.storyboard

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+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="11134" systemVersion="15F34" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="11106"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="EHf-IW-A2E">
+            <objects>
+                <viewController id="01J-lp-oVM" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="Llm-lL-Icb"/>
+                        <viewControllerLayoutGuide type="bottom" id="xb3-aO-Qok"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="53" y="375"/>
+        </scene>
+    </scenes>
+</document>

Examples/iOS/MIDI to Audio iOS/MIDI to Audio iOS/Base.lproj/Main.storyboard

@@ -0,0 +1,91 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="11762" systemVersion="16C67" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="BYZ-38-t0r">
+    <device id="retina4_7" orientation="portrait">
+        <adaptation id="fullscreen"/>
+    </device>
+    <dependencies>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="11757"/>
+        <capability name="Constraints to layout margins" minToolsVersion="6.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="tne-QT-ifu">
+            <objects>
+                <viewController id="BYZ-38-t0r" customClass="ViewController" customModule="MIDI_to_Audio_iOS" customModuleProvider="target" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="y3c-jy-aDJ"/>
+                        <viewControllerLayoutGuide type="bottom" id="wfy-db-euE"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <subviews>
+                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="UQ3-EZ-nTP">
+                                <rect key="frame" x="16" y="150" width="343" height="165"/>
+                                <fontDescription key="fontDescription" type="system" weight="medium" pointSize="15"/>
+                                <state key="normal" title="Play Original MIDI File"/>
+                                <connections>
+                                    <action selector="playOriginalButtonPressed:" destination="BYZ-38-t0r" eventType="touchUpInside" id="Y5n-Sw-9UZ"/>
+                                </connections>
+                            </button>
+                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="vdn-Nq-oaR">
+                                <rect key="frame" x="16" y="485" width="343" height="162"/>
+                                <fontDescription key="fontDescription" type="system" weight="medium" pointSize="15"/>
+                                <state key="normal" title="Play to Converted Audio File"/>
+                                <connections>
+                                    <action selector="playConvertedButtonPressed:" destination="BYZ-38-t0r" eventType="touchUpInside" id="6qJ-Tc-2is"/>
+                                </connections>
+                            </button>
+                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="MIDI To Audio File" textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" minimumScaleFactor="0.25" translatesAutoresizingMaskIntoConstraints="NO" id="V8h-kC-8LS">
+                                <rect key="frame" x="16" y="20" width="343" height="122"/>
+                                <constraints>
+                                    <constraint firstAttribute="height" constant="122" id="ohq-me-Nke"/>
+                                </constraints>
+                                <fontDescription key="fontDescription" type="system" weight="thin" pointSize="36"/>
+                                <nil key="textColor"/>
+                                <nil key="highlightedColor"/>
+                            </label>
+                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="eUE-Fb-YfL">
+                                <rect key="frame" x="16" y="323" width="343" height="154"/>
+                                <constraints>
+                                    <constraint firstAttribute="height" constant="154" id="7Me-B4-mUw"/>
+                                </constraints>
+                                <fontDescription key="fontDescription" type="system" weight="medium" pointSize="15"/>
+                                <state key="normal" title="Convert MIDI to Audio File"/>
+                                <connections>
+                                    <action selector="convertToAudioFileButtonPressed:" destination="BYZ-38-t0r" eventType="touchUpInside" id="zvr-jc-0WI"/>
+                                </connections>
+                            </button>
+                        </subviews>
+                        <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                        <constraints>
+                            <constraint firstItem="eUE-Fb-YfL" firstAttribute="leading" secondItem="vdn-Nq-oaR" secondAttribute="leading" id="04I-KH-KMY"/>
+                            <constraint firstItem="V8h-kC-8LS" firstAttribute="leading" secondItem="8bC-Xf-vdC" secondAttribute="leadingMargin" id="1ND-BR-jdf"/>
+                            <constraint firstItem="V8h-kC-8LS" firstAttribute="trailing" secondItem="UQ3-EZ-nTP" secondAttribute="trailing" id="9wk-P0-8HT"/>
+                            <constraint firstItem="eUE-Fb-YfL" firstAttribute="top" secondItem="UQ3-EZ-nTP" secondAttribute="bottom" constant="8" symbolic="YES" id="A4M-pe-g6k"/>
+                            <constraint firstItem="V8h-kC-8LS" firstAttribute="trailing" secondItem="8bC-Xf-vdC" secondAttribute="trailingMargin" id="KML-n8-sNG"/>
+                            <constraint firstItem="eUE-Fb-YfL" firstAttribute="centerY" secondItem="8bC-Xf-vdC" secondAttribute="centerY" constant="66.5" id="NY1-vU-C3U"/>
+                            <constraint firstItem="UQ3-EZ-nTP" firstAttribute="trailing" secondItem="eUE-Fb-YfL" secondAttribute="trailing" id="OUq-Vx-EZr"/>
+                            <constraint firstItem="V8h-kC-8LS" firstAttribute="top" secondItem="y3c-jy-aDJ" secondAttribute="bottom" id="Uy4-Qq-qEQ"/>
+                            <constraint firstItem="vdn-Nq-oaR" firstAttribute="top" secondItem="eUE-Fb-YfL" secondAttribute="bottom" constant="8" symbolic="YES" id="XET-f0-XMc"/>
+                            <constraint firstItem="eUE-Fb-YfL" firstAttribute="trailing" secondItem="vdn-Nq-oaR" secondAttribute="trailing" id="Xdh-Yz-IZm"/>
+                            <constraint firstItem="V8h-kC-8LS" firstAttribute="leading" secondItem="UQ3-EZ-nTP" secondAttribute="leading" id="aXH-7L-Yv2"/>
+                            <constraint firstItem="UQ3-EZ-nTP" firstAttribute="leading" secondItem="eUE-Fb-YfL" secondAttribute="leading" id="dwv-2k-k4l"/>
+                            <constraint firstItem="UQ3-EZ-nTP" firstAttribute="top" secondItem="V8h-kC-8LS" secondAttribute="bottom" constant="8" symbolic="YES" id="jTC-Sd-6qx"/>
+                            <constraint firstAttribute="bottom" secondItem="vdn-Nq-oaR" secondAttribute="bottom" constant="20" symbolic="YES" id="vXf-uq-tCE"/>
+                        </constraints>
+                    </view>
+                    <connections>
+                        <outlet property="convertToAudioFileButton" destination="eUE-Fb-YfL" id="Qbt-jB-sps"/>
+                        <outlet property="playConvertedAudioFileButton" destination="vdn-Nq-oaR" id="Qgm-Fi-aoE"/>
+                        <outlet property="playOriginalButton" destination="UQ3-EZ-nTP" id="Yne-4Q-fCL"/>
+                    </connections>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="136.80000000000001" y="137.18140929535232"/>
+        </scene>
+    </scenes>
+</document>

Examples/iOS/MIDI to Audio iOS/MIDI to Audio iOS/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>en</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>UILaunchStoryboardName</key>
+	<string>LaunchScreen</string>
+	<key>UIMainStoryboardFile</key>
+	<string>Main</string>
+	<key>UIRequiredDeviceCapabilities</key>
+	<array>
+		<string>armv7</string>
+	</array>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+</dict>
+</plist>

Examples/iOS/MIDI to Audio iOS/MIDI to Audio iOS/ViewController.swift

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+//
+//  ViewController.swift
+//  MIDI to Audio iOS
+//
+//  Created by Sasha Ivanov on 2016-12-24.
+//  Copyright © 2016 madebysasha. All rights reserved.
+
+//	Permission is hereby granted, free of charge, to any person obtaining a
+//	copy of this software and associated documentation files (the
+//	"Software"), to deal in the Software without restriction, including
+//	without limitation the rights to use, copy, modify, merge, publish,
+//	distribute, sublicense, and/or sell copies of the Software, and to
+//	permit persons to whom the Software is furnished to do so, subject to
+//	the following conditions:
+//
+//	The above copyright notice and this permission notice shall be included
+//	in all copies or substantial portions of the Software.
+//
+//	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+//	OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+//	MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+//	IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+//	CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+//	TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+//	SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+
+import UIKit
+import AVFoundation
+import MIKMIDI
+
+class ViewController: UIViewController {
+
+
+
+    var midiUrl:URL?
+    var soundfontUrl:URL?
+    var sequencer:MIKMIDISequencer?
+
+    var audioUrl:URL?
+    var audioPlayer:AVPlayer?
+
+    @IBOutlet weak var playOriginalButton: UIButton!
+    @IBOutlet weak var convertToAudioFileButton: UIButton!
+    @IBOutlet weak var playConvertedAudioFileButton: UIButton!
+
+    @IBAction func playOriginalButtonPressed(_ sender: Any) {
+
+        // Play the sequencer
+        sequencer?.startPlayback()
+
+    }
+
+    @IBAction func convertToAudioFileButtonPressed(_ sender: Any) {
+
+        // Create the MIKMIDI Audio Exporter
+        let audioExporter = MIKMIDIToAudioExporter(midiFileAt: midiUrl)
+
+        // Add the soundfont to the Audio Exporter (NEW from macOS Example)
+        audioExporter?.addSoundfont(soundfontUrl)
+
+        // Render the MIDI file as a CAF file with the added soundfont
+        audioExporter?.exportWithSoundfontToAudioFile(completionHandler: { (audioOutputUrl, error) in
+
+            // Check if there was an error durring the export
+            if (audioOutputUrl == nil){
+                if((error) != nil){
+                    NSLog(error as! String)
+                    print("Audio Conversion Failed")
+                }
+            }
+
+                // Otherwise save the output url and enable the Play Converted Audio button
+            else{
+                self.audioUrl = audioOutputUrl
+                self.playConvertedAudioFileButton.isEnabled = true
+            }
+        })
+    }
+
+    @IBAction func playConvertedButtonPressed(_ sender: Any) {
+
+        // Create an AV Audio Player to playback the converted file
+        audioPlayer = AVPlayer(url: audioUrl!)
+
+        // Play the converted file
+        audioPlayer?.play()
+    }
+
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+
+        // 1. Disable the Play Converted Audio button. (Will enable when the convert button is pressed)
+        playConvertedAudioFileButton.isEnabled = false
+
+        // 2. Set the URLs of the files we want to use for playback (midi file and soundfont file)
+        midiUrl = Bundle.main.url(forResource: "TheOriginal", withExtension: "mid")
+        soundfontUrl = Bundle.main.url(forResource: "Stereo Piano",  withExtension: ".sf2")
+
+        // 3. Setup the MIKMIDI Sequencer for Playing Back Original Midi File
+        do{
+            // Create a MIKMIDI Sequence from the midi file
+            let sequence = try MIKMIDISequence(fileAt: midiUrl!)
+
+            // Create a MIKMIDI Sequencer from the sequence
+            sequencer = MIKMIDISequencer(sequence: sequence)
+
+            // Use the Soundfont File to set the Synth for each Track in the Sequence.
+            for track in sequence.tracks{
+                let synth = sequencer?.builtinSynthesizer(for: track)
+                try synth!.loadSoundfontFromFile(at: soundfontUrl!)
+            }
+        }
+        catch{
+            print("Unable to Create Sequencer")
+        }
+    }
+
+    override func didReceiveMemoryWarning() {
+        super.didReceiveMemoryWarning()
+        // Dispose of any resources that can be recreated.
+    }
+
+
+
+
+
+}
+