Question

尝试将以下image保存到本地存储。

if let imageData: Data = UIImagePNGRepresentation(self.emitterImageView.image!) {
         try! imageData.write(to: savedImagePath, options: [])
 }

但是由于以下错误而崩溃。

线程1：致命错误：“尝试！”表达式意外引发错误：错误域= NSCocoaErrorDomain代码= 4“该文件 “ PHDEmitterImage1.png”不存在。” UserInfo = {NSFilePath = / private / var / mobile / Containers / Data / Application / 41D876EC-7D65-4AB1-820E-EDE46FAE8675 / tmp / PHDEmitterBackup / PHDEmitterImage1.png， NSUnderlyingError = 0x15bf21790 {Error Domain = NSPOSIXErrorDomain Code = 2 “没有这样的文件或目录”}}

问题出在哪里？

保存的图像路径为file:/private/var/mobile/Containers/Data/Application/41D876EC-7D65-4AB1-820E-EDE46FAE8675/tmp/PHDEmitterBackup/PHDEmitterImage1.png

自定义路径

func emitterBackupDirectoryPath() -> String? {

    let dataPath = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first?.absoluteString
    //let dataPath = URL(fileURLWithPath: documentsDir).appendingPathComponent("/PHDEmitterBackup").absoluteString

    //let dataPath = documentsDir?.appendingPathComponent("/PHDEmitterBackup").absoluteString

    if !FileManager.default.fileExists(atPath: dataPath!) { //if does not exist
        do {
            try FileManager.default.createDirectory(atPath: dataPath!, withIntermediateDirectories: false, attributes: nil) //Create folder
        } catch {
        }
    }

    return dataPath
}

Answer 1

您可以将image data另存为，

let tempURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first
let savedImagePath = tempURL?.appendingPathComponent("Emitter.png")

if let path = savedImagePath, let imageData = self.emitterImageView.image?.pngData() {
    do {
         try imageData.write(to: path, options: [])
    } catch {
         print(error)        
    }
}

Answer 2

解决上述问题有帮助的问题，我在此声明，因为它可能对某人有所帮助。问题在于dataPath变量是URL。要以字符串形式获取路径，需要使用path属性，而不是absoluteString。

无法在iOS swift中写入本地存储“无此文件或目录”问题

2 个答案: