struct Item: Identifiable {
let id: String
let url = URL(string: "https://styles.redditmedia.com/t5_j6lc8/styles/communityIcon_9uopq0bazux01.jpg")!
}
struct Content: View {
let model: [Item] = {
var model = [Item]()
for i in 0 ..< 100 {
model.append(.init(id: String(i)))
}
return model
}()
var body: some View {
List(model) { item in
Row(item: item)
}
}
}
struct Row: View {
let item: Item
var body: some View {
AsyncImage(url: item.url)
}
}
Running code above with Xcode 14.1 RC on iOS 16.1 Beta simulator, AsyncImage sometimes doesn’t properly show downloaded image but grey rectangle instead when scrolling in list. Is this bug or am I missing something? Thanks
michal97
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
Last seen
User for
From
Prague, Czechia
Post
Replies
Boosts
Views
Activity
Hi, I have this simple view in SwiftUI, where it's possible to move a single row and select one or more rows.
struct ContentView: View {
@State var selectedItems = Set<Int>()
@State var items = Array(1...10).map({ S(id: $0) })
var body: some View {
List(selection: $selectedItems) {
ForEach(items) { (item) in
Text(String(item.id))
.padding()
}
.onMove(perform: { indices, newOffset in
withAnimation {
self.items.move(fromOffsets: indices, toOffset: newOffset)
}
})
}
}
}
When I select 2 or more rows and try to move them I got this error log:
2020-07-30 10:20:03.035238+0200 list[54240:1678921] [General] There are 2 items on the pasteboard, but 1 drag images. There must be 1 draggingItem per pasteboardItem.
2020-07-30 10:20:03.039250+0200 list[54240:1678921] [General] (
0 CoreFoundation 0x00007fff2a8865af __exceptionPreprocess + 242
1 libobjc.A.dylib 0x00007fff6acb36c4 objc_exception_throw + 48
2 CoreFoundation 0x00007fff2a886413 +[NSException raise:format:] + 189
3 AppKit 0x00007fff27a61d80 -[NSDraggingSession(NSInternal) _initWithPasteboard:image:offset:source:] + 243
4 AppKit 0x00007fff27a617ba -[NSCoreDragManager dragImage:fromWindow:at:offset:event:pasteboard:source:slideBack:] + 1767
5 AppKit 0x00007fff27a610c1 -[NSWindow(NSDrag) dragImage:at:offset:event:pasteboard:source:slideBack:] + 134
6 AppKit 0x00007fff27ec27fb -[NSTableView _doImageDragUsingRowsWithIndexes:event:pasteboard:source:slideBack:startRow:] + 665
7 AppKit 0x00007fff27ec2cb2 -[NSTableView _checkOverrideAndDoImageDragUsingRowsWithIndexes:event:pasteboard:source:slideBack:startRow:] + 254
8 AppKit 0x00007fff27ec3956 -[NSTableView _performClassicDragOfIndexes:hitRow:event:] + 444
9 AppKit 0x00007fff27a88936 -[NSTableView _performDragFromMouseDown:] + 472
10 AppKit 0x00007fff27a87fce -[NSTableView mouseDown:] + 5300
11 AppKit 0x00007fff27935028 -[NSWindow(NSEventRouting) _handleMouseDownEvent:isDelayedEvent:] + 4956
12 AppKit 0x00007fff278a413c -[NSWindow(NSEventRouting) _reallySendEvent:isDelayedEvent:] + 2594
13 AppKit 0x00007fff278a34fe -[NSWindow(NSEventRouting) sendEvent:] + 347
14 AppKit 0x00007fff278a18e8 -[NSApplication(NSEvent) sendEvent:] + 352
15 AppKit 0x00007fff27b78cd6 -[NSApplication _handleEvent:] + 65
16 AppKit 0x00007fff27709f83 -[NSApplication run] + 623
17 AppKit 0x00007fff276dde14 NSApplicationMain + 816
18 SwiftUI 0x00007fff363c8cd4 $s7SwiftUI6runAppys5NeverOSo21NSApplicationDelegate_pFTf4e_nAA07TestingdG0C_Tg5 + 100
19 SwiftUI 0x00007fff36bf0162 $s7SwiftUI6runAppys5NeverOxAA0D0RzlF + 162
20 SwiftUI 0x00007fff367b8e9d $s7SwiftUI3AppPAAE4mainyyFZ + 61
21 list 0x0000000105397f71 $s4list0A3AppV5$mainyyFZ + 33
22 list 0x0000000105397ff4 main + 20
23 libdyld.dylib 0x00007fff6bf2d7d1 start + 1
24 ??? 0x0000000000000003 0x0 + 3
)
Did I do something wrong or it's bug in SwiftUI? Is it possible to move more than 1 row at once?
Thanks a lot!
So I have two videos assets - one for background and one for foreground. What I want to achieve is to apply a CIFilter (ChromaKey) to the foreground video then add the background video so the two overlap. I can do the overlap or applying the filter but I can't put it together. Here is my code for videos overlap.
let bgAsset = AVURLAsset(url: URL(fileURLWithPath: Bundle.main.path(forResource: "bg", ofType: "mp4")!))
let fgAsset = AVURLAsset(url: URL(fileURLWithPath: Bundle.main.path(forResource: "fg", ofType: "mp4")!))
let mixComposition = AVMutableComposition()
let bgTrack = mixComposition.addMutableTrack(withMediaType: .video, preferredTrackID: kCMPersistentTrackIDInvalid)!
let fgTrack = mixComposition.addMutableTrack(withMediaType: .video, preferredTrackID: kCMPersistentTrackIDInvalid)!
try! bgTrack.insertTimeRange(CMTimeRange(start: .zero, duration: bgAsset.duration), of: bgAsset.tracks(withMediaType: .video).first!, at: .zero)
try! fgTrack.insertTimeRange(CMTimeRange(start: .zero, duration: bgAsset.duration), of: fgAsset.tracks(withMediaType: .video).first!, at: .zero)
let mainInstruction = AVMutableVideoCompositionInstruction()
mainInstruction.timeRange = CMTimeRange(start: .zero, duration: bgAsset.duration)
let firstLayerInstruction = AVMutableVideoCompositionLayerInstruction(assetTrack: bgTrack)
let secondLayerInstruction = AVMutableVideoCompositionLayerInstruction(assetTrack: fgTrack)
mainInstruction.layerInstructions = [secondLayerInstruction, firstLayerInstruction]
let videoComposition = AVMutableVideoComposition()
videoComposition.instructions = [mainInstruction]
videoComposition.frameDuration = CMTime(value: 1, timescale: 30)
videoComposition.renderSize = CGSize(width: 640, height: 480)
let url = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0].appendingPathComponent("overlapVideo.mov")
let exporter = AVAssetExportSession(asset: mixComposition, presetName: AVAssetExportPresetHighestQuality)!
exporter.outputURL = url
exporter.videoComposition = videoComposition
exporter.outputFileType = .mov
exporter.exportAsynchronously {
print("finished")
}
Thanks for any help!