缩略图加载策略优化

BFRecordScreenKit/Classes/RecordScreen/View/BFVideoThumbProgressView.swift

@@ -30,7 +30,7 @@ class BFVideoThumbProgressView: UIView {
     var dragStartHandle: (() -> Void)?
     var isDrag = false
 
-    let thumbImageWidth = 70.0
+    let thumbImageWidth : CGFloat = 70.0
 
     let fetchThumbStrategy: BFVideoThumbProgressStrategyProtocol = BFVideoThumbProgressStrategy()
 
@@ -75,6 +75,14 @@ class BFVideoThumbProgressView: UIView {
             make.width.equalTo(3)
             make.center.height.equalToSuperview()
         }
+        
+        progressView.contentView.addSubview(progessIndicateBackV)
+        progessIndicateBackV.snp.remakeConstraints { make in
+            make.left.equalTo(width * 0.5)
+            make.right.equalTo(width * -0.5)
+            make.bottom.equalToSuperview()
+            make.height.equalTo(6)
+        }
     }
 
     required init?(coder _: NSCoder) {
@@ -102,8 +110,9 @@ class BFVideoThumbProgressView: UIView {
         let date = Date()
         let dur = videoAsset.duration.seconds
         if dur > 0 {
-            let fps = Double(fetchThumbStrategy.frameNumberOfVideo(assetDuration: dur)) / dur
-            splitVideoFileUrlFps(urlAsset: videoAsset, fps: fps, firstImagesCount: 4) { [weak self] hadGetAll, images in
+            let count = fetchThumbStrategy.frameNumberOfVideo(assetDuration: dur)
+            let fps = Double(count) / dur
+            splitVideoFileUrlFps(urlAsset: videoAsset, fps: fps, firstImagesCount: Int(ceil(width/2.0/thumbImageWidth))) { [weak self] hadGetAll, images in
                 BFLog(1, message: "获取缩略图：\(hadGetAll), \(Date().timeIntervalSince(date))")
                 self?.recordItem!.thumbImgs.removeAll()
                 self?.recordItem!.thumbImgs.append(contentsOf: images)
@@ -125,7 +134,9 @@ class BFVideoThumbProgressView: UIView {
     func addThumbImages(images: [UIImage]) {
         DispatchQueue.main.async { [weak self] in
             self?.progressView.contentView.subviews.forEach { subview in
-                subview.removeFromSuperview()
+                if subview is UIImageView {
+                    subview.removeFromSuperview()
+                }
             }
             if images.count > 0 {
                 self?.thumbImgs = images
@@ -135,7 +146,7 @@ class BFVideoThumbProgressView: UIView {
                         let iv = UIImageView(image: img)
                         iv.contentMode = .scaleAspectFill
                         iv.clipsToBounds = true
-                        sself.progressView.contentView.addSubview(iv)
+                        sself.progressView.contentView.insertSubview(iv, belowSubview: sself.progessIndicateBackV)
                         iv.snp.makeConstraints { make in
                             make.left.equalTo(CGFloat(i) * CGFloat(sself.thumbImageWidth) + sself.width * 0.5)
                             make.top.bottom.equalToSuperview()
@@ -148,13 +159,13 @@ class BFVideoThumbProgressView: UIView {
                         make.right.equalTo(sself.width * -0.5)
                     }
 
-                    sself.progressView.contentView.addSubview(sself.progessIndicateBackV)
-                    sself.progessIndicateBackV.snp.makeConstraints { make in
-                        make.left.equalTo(sself.width * 0.5)
-                        make.right.equalTo(sself.width * -0.5)
-                        make.bottom.equalToSuperview()
-                        make.height.equalTo(6)
-                    }
+//                    sself.progressView.contentView.addSubview(sself.progessIndicateBackV)
+//                    sself.progessIndicateBackV.snp.remakeConstraints { make in
+//                        make.left.equalTo(sself.width * 0.5)
+//                        make.right.equalTo(sself.width * -0.5)
+//                        make.bottom.equalToSuperview()
+//                        make.height.equalTo(6)
+//                    }
                 }
             }
         }