動画にTextViewを合成して書き出したい

前提・実現したいこと

URLからAVAssetに変換し、その上からロゴと文字を合成し書き出す処理をしています。
その時にCATextLayerを使い文字を書き合成しているのですが、TextViewを使うことはできないでしょうか？
Tiktokのこちらの動画のように文字を縁取る文字を合成したいため以下リンクのTextViewを使いたいと思ってます。
TextViewの参考にした記事

何かアドバイスいただきたいです。

該当のソースコード

swift
1import UIKit
2import AVFoundation
3import AVKit
4import Photos
5
6class ViewController: UIViewController {
7
8var myurl: URL?
9
10override func viewDidLoad() {
11    super.viewDidLoad()
12}
13
14@IBAction func saveVideoTapper(_ sender: Any) {
15
16    let path = Bundle.main.path(forResource: "sample_video", ofType:"mp4")
17    let fileURL = NSURL(fileURLWithPath: path!)
18
19    let composition = AVMutableComposition()
20    let vidAsset = AVURLAsset(url: fileURL as URL, options: nil)
21
22    // get video track
23    let vtrack =  vidAsset.tracks(withMediaType: AVMediaType.video)
24    let videoTrack: AVAssetTrack = vtrack[0]
25    let vid_timerange = CMTimeRangeMake(start: CMTime.zero, duration: vidAsset.duration)
26
27    let tr: CMTimeRange = CMTimeRange(start: CMTime.zero, duration: CMTime(seconds: 10.0, preferredTimescale: 600))
28    composition.insertEmptyTimeRange(tr)
29
30    let trackID:CMPersistentTrackID = CMPersistentTrackID(kCMPersistentTrackID_Invalid)
31
32    if let compositionvideoTrack: AVMutableCompositionTrack = composition.addMutableTrack(withMediaType: AVMediaType.video, preferredTrackID: trackID) {
33
34        do {
35            try compositionvideoTrack.insertTimeRange(vid_timerange, of: videoTrack, at: CMTime.zero)
36        } catch {
37            print("error")
38        }
39
40        compositionvideoTrack.preferredTransform = videoTrack.preferredTransform
41
42    } else {
43        print("unable to add video track")
44        return
45    }
46
47
48    // Watermark Effect
49    let size = videoTrack.naturalSize
50
51    let imglogo = UIImage(named: "image.png")
52    let imglayer = CALayer()
53    imglayer.contents = imglogo?.cgImage
54    imglayer.frame = CGRect(x: 5, y: 5, width: 100, height: 100)
55    imglayer.opacity = 0.6
56
57    // create text Layer
58    let titleLayer = CATextLayer()
59    titleLayer.backgroundColor = UIColor.white.cgColor
60    titleLayer.isWrapped = true
61    titleLayer.truncationMode = .end
62    titleLayer.alignmentMode = CATextLayerAlignmentMode.center
63    titleLayer.frame = CGRect(x: 0, y: 50, width: size.width, height: size.height / 6)
64    var attributes: [NSAttributedString.Key: Any] = [.foregroundColor: UIColor.white, .font: UIFont.systemFont(ofSize: 26, weight: .bold)]
65    let paragraphStyle = NSMutableParagraphStyle()
66    paragraphStyle.lineSpacing = 0
67    paragraphStyle.alignment = .center        
68    attributes.updateValue(paragraphStyle, forKey: .paragraphStyle)
69    let attributeString = NSAttributedString(string:"DuummyText\nDummuyText", attributes: attributes)
70    textLayer.string = attributeString
71
72
73    let videolayer = CALayer()
74    videolayer.frame = CGRect(x: 0, y: 0, width: size.width, height: size.height)
75
76    let parentlayer = CALayer()
77    parentlayer.frame = CGRect(x: 0, y: 0, width: size.width, height: size.height)
78    parentlayer.addSublayer(videolayer)
79    parentlayer.addSublayer(imglayer)
80    parentlayer.addSublayer(titleLayer)
81
82    let layercomposition = AVMutableVideoComposition()
83    layercomposition.frameDuration = CMTimeMake(value: 1, timescale: 30)
84    layercomposition.renderSize = size
85    layercomposition.animationTool = AVVideoCompositionCoreAnimationTool(postProcessingAsVideoLayer: videolayer, in: parentlayer)
86
87    // instruction for watermark
88    let instruction = AVMutableVideoCompositionInstruction()
89    instruction.timeRange = CMTimeRangeMake(start: CMTime.zero, duration: composition.duration)
90    let videotrack = composition.tracks(withMediaType: AVMediaType.video)[0] as AVAssetTrack
91    let layerinstruction = AVMutableVideoCompositionLayerInstruction(assetTrack: videotrack)
92    instruction.layerInstructions = NSArray(object: layerinstruction) as [AnyObject] as! [AVVideoCompositionLayerInstruction]
93    layercomposition.instructions = NSArray(object: instruction) as [AnyObject] as! [AVVideoCompositionInstructionProtocol]
94
95    //  create new file to receive data
96    let dirPaths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)
97    let docsDir = dirPaths[0] as NSString
98    let movieFilePath = docsDir.appendingPathComponent("result.mov")
99    let movieDestinationUrl = NSURL(fileURLWithPath: movieFilePath)
100
101    // use AVAssetExportSession to export video
102    let assetExport = AVAssetExportSession(asset: composition, presetName:AVAssetExportPresetHighestQuality)
103    assetExport?.outputFileType = AVFileType.mov
104    assetExport?.videoComposition = layercomposition
105
106    // Check exist and remove old file
107    FileManager.default.removeItemIfExisted(movieDestinationUrl as URL)
108
109    assetExport?.outputURL = movieDestinationUrl as URL
110    assetExport?.exportAsynchronously(completionHandler: {
111        switch assetExport!.status {
112        case AVAssetExportSession.Status.failed:
113            print("failed")
114            print(assetExport?.error ?? "unknown error")
115        case AVAssetExportSession.Status.cancelled:
116            print("cancelled")
117            print(assetExport?.error ?? "unknown error")
118        default:
119            print("Movie complete")
120
121            self.myurl = movieDestinationUrl as URL
122
123            PHPhotoLibrary.shared().performChanges({
124                PHAssetChangeRequest.creationRequestForAssetFromVideo(atFileURL: movieDestinationUrl as URL)
125            }) { saved, error in
126                if saved {
127                    print("Saved")
128                }
129            }
130
131            self.playVideo()
132
133        }
134    })
135
136}
137
138
139func playVideo() {
140    let player = AVPlayer(url: myurl!)
141    let playerLayer = AVPlayerLayer(player: player)
142    playerLayer.frame = self.view.bounds
143    self.view.layer.addSublayer(playerLayer)
144    player.play()
145    print("playing...")
146}
147
148
149
150}
151
152
153extension FileManager {
154func removeItemIfExisted(_ url:URL) -> Void {
155    if FileManager.default.fileExists(atPath: url.path) {
156        do {
157            try FileManager.default.removeItem(atPath: url.path)
158        }
159        catch {
160            print("Failed to delete file")
161        }
162    }
163}
164}

tomato879241

2021/04/05 10:59

CATextLayerに関してDocumentationに何と書いてありますか？以下のようにあります。 A layer that provides simple text layout and rendering of plain or attributed strings. CATextLayerのstringのタイプは文字列ではありません。NSAtttributedのobjectも渡すことができるようなので、試してみてはどうでしょう？