SwiftUI 2.0:使用.fileExporter修改器导出图像
目标:使用新的.fileExporter修改器使用SwiftUI导出图像 问题:目标图像未传递到.fileExporter文档 问题:如何获取.fileExporter修改器以导出图像SwiftUI 2.0:使用.fileExporter修改器导出图像,swiftui,ios14,xcode12,macos-big-sur,Swiftui,Ios14,Xcode12,Macos Big Sur,目标:使用新的.fileExporter修改器使用SwiftUI导出图像 问题:目标图像未传递到.fileExporter文档 问题:如何获取.fileExporter修改器以导出图像 struct ContentView: View { @State private var openFile = false @State private var exportFile = false @State private var img1 = UIImage()
struct ContentView: View {
@State private var openFile = false
@State private var exportFile = false
@State private var img1 = UIImage()
@State private var img2 = UIImage()
@State private var target: Binding<UIImage>? // dynamic target for importer
var body: some View {
Form {
//image 1
Button(action: {
self.target = $img1
self.openFile.toggle()
}){
Image(uiImage: self.img1)
.renderingMode(.original)
.resizable()
.frame(width: 48, height: 48)
.clipShape(Circle())
}
//image 2
Button(action: {
self.target = $img2
self.openFile.toggle()
}){
Image(uiImage: self.img2)
.renderingMode(.original)
.resizable()
.frame(width: 48, height: 48)
.clipShape(Circle())
}
}
.navigationTitle("File Importer")
//file exporter not working. not sure what I should input as "document"
.fileExporter(isPresented: $exportFile, document: target, contentType: .image) { result in
if case .success = result {
// Handle success.
} else {
// Handle failure.
}
}
//file importer
.fileImporter(isPresented: $openFile, allowedContentTypes: [.image]) { (res) in
do{
let fileUrl = try res.get()
print(fileUrl)
guard fileUrl.startAccessingSecurityScopedResource() else { return }
if let imageData = try? Data(contentsOf: fileUrl),
let image = UIImage(data: imageData) {
self.target?.wrappedValue = image
}
fileUrl.stopAccessingSecurityScopedResource()
} catch{
print ("error reading")
print (error.localizedDescription)
}
}
}
}
struct ContentView:View{
@State private var openFile=false
@State private var exportFile=false
@国家私有变量img1=UIImage()
@国家私有变量img2=UIImage()
@状态私有变量目标:绑定?//导入程序的动态目标
var body:一些观点{
形式{
//图1
按钮(操作:{
self.target=$img1
self.openFile.toggle()
}){
图像(uiImage:self.img1)
.renderingMode(.original)
.可调整大小()
.框架(宽度:48,高度:48)
.clipShape(圆())
}
//图2
按钮(操作:{
self.target=$img2
self.openFile.toggle()
}){
图像(uiImage:self.img2)
.renderingMode(.original)
.可调整大小()
.框架(宽度:48,高度:48)
.clipShape(圆())
}
}
.navigationTitle(“文件导入器”)
//文件导出器不工作。不确定应该输入什么作为“文档”
.fileExporter(显示:$exportFile,文档:target,contentType:.image){结果为
如果case.success=结果{
//处理成功。
}否则{
//处理失败。
}
}
//文件导入器
.fileImporter(显示:$openFile,allowedContentTypes:[.image]){(res)在
做{
让fileUrl=try res.get()
打印(文件URL)
guard fileUrl.startAccessingSecurityScopedResource()else{return}
如果让imageData=try?数据(contentsOf:fileUrl),
让image=UIImage(数据:imageData){
self.target?.wrappedValue=图像
}
fileUrl.stopAccessingSecurityScopedResource()的
}抓住{
打印(“错误读取”)
打印(错误。本地化描述)
}
}
}
}
我发现了一些代码问题和一些逻辑问题。以下是我编辑的版本:
struct ContentView: View {
@State private var openFile = false
@State private var exportFile = false
@State private var img1 = UIImage(named: "0")!
@State private var img2 = UIImage(named: "1")!
@State private var target : UIImage?
var body: some View {
Form {
//image 1
Button(action: {
self.target = img1
self.exportFile.toggle()
//self.openFile.toggle()
}){
Image(uiImage: self.img1)
.renderingMode(.original)
.resizable()
.frame(width: 48, height: 48)
.clipShape(Circle())
}
//image 2
Button(action: {
self.target = img2
self.exportFile.toggle()
//self.openFile.toggle()
}){
Image(uiImage: self.img2)
.renderingMode(.original)
.resizable()
.frame(width: 48, height: 48)
.clipShape(Circle())
}
}
.navigationTitle("File Importer")
.fileExporter(isPresented: $exportFile, document: ImageDocument(image: target), contentType: .png, onCompletion: { (result) in
if case .success = result {
print("Success")
} else {
print("Failure")
}
})
//file importer
.fileImporter(isPresented: $openFile, allowedContentTypes: [.image]) { (res) in
do{
let fileUrl = try res.get()
print(fileUrl)
guard fileUrl.startAccessingSecurityScopedResource() else { return }
if let imageData = try? Data(contentsOf: fileUrl),
let image = UIImage(data: imageData) {
self.target = image
}
fileUrl.stopAccessingSecurityScopedResource()
} catch{
print ("error reading")
print (error.localizedDescription)
}
}
}
}
struct ImageDocument: FileDocument {
static var readableContentTypes: [UTType] { [.png] }
var image: UIImage
init(image: UIImage?) {
self.image = image ?? UIImage()
}
init(configuration: ReadConfiguration) throws {
guard let data = configuration.file.regularFileContents,
let image = UIImage(data: data)
else {
throw CocoaError(.fileReadCorruptFile)
}
self.image = image
}
func fileWrapper(configuration: WriteConfiguration) throws -> FileWrapper {
return FileWrapper(regularFileWithContents: image.pngData()!)
}
}
需要注意的事项:
exportFile
状态变量,但从未修改过它。这意味着fileExporter
永远不会出现绑定
传递给需要文件文档
的函数。我为图像编写了一个简单的FileDocument
实现openFile
切换为exportFile
,您现在没有任何openFile
访问权限。这是一个合乎逻辑的决定,你需要弄清楚何时/如何触发它们如果您想要一种不同类型的解决方案,还可以使用
\.exportFiles
操作:谢谢!!!您知道如何在文件夹中导出多个图像吗?尝试过但没有成功…您必须编写自己的导出解决方案,而不是使用fileExporter。fileExporter一次只能处理一个文档()。这是假设您希望将它们作为单独的文件导出。如果您想将它们作为一个包导出,您可以考虑这样做——不过,这可能是一个很好的第二个问题,而不是一个我有专业知识的问题,再次感谢!我发布了另一个问题。目标是导出一个包含5个图像的文件夹