Swift NSFileManager.defaultManager（）.removeItemAtPath仅在应用程序终止时删除文件

因此，我使用下面的方法来处理获取、删除和保存我的应用程序的图像。当我调用

removeImage

时，它会成功，当我使用

NSFileManager.defaultManager（）.fileExistsAtPath

时，它会说该文件不存在。但是，当我调用

getImage

时，即使图像已被删除，它仍然可以抓取图像。当我重新启动应用程序时，

getImage

会按预期工作，直到我使用

removeImage

。我还尝试过将

removeImage

调用包装成

dispatch\u async（dispatch\u get\u main\u queue（），{}）

，但它仍然不起作用

我的代码：

class func removeImage(user:User){
    let context = getManagedObjectContext()
    context.performBlockAndWait({
        guard let paths = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true) as [String]! where paths.count > 0 else{
            return
        }

        do{
            if let dirPath = paths[0] as String!{
                let path = "\(user.id)_\(user.name).png"
                let readPath = (dirPath as NSString).stringByAppendingPathComponent(path)
                try NSFileManager.defaultManager().removeItemAtPath(readPath)
            }
        }catch{
        }
    })
}

class func saveImage(user:User,image:UIImage){
    let path = "\(user.id)_\(user.name).png"
    guard let paths = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true) as [String]! where paths.count > 0 else{
        return
    }
    if let dirPath = paths[0] as String!{
        let writePath = (dirPath as NSString).stringByAppendingPathComponent(path)
        UIImagePNGRepresentation(image)!.writeToFile(writePath, atomically: true)
    }
}


class func getImage(user:User)->UIImage?{
    let path = "\(user.id)_\(user.name).png"
    guard let paths = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true) as [String]! where paths.count > 0 else{
        return nil
    }
    if let dirPath = paths[0] as String!{
        let readPath = (dirPath as NSString).stringByAppendingPathComponent(path)
        return UIImage(named: readPath)
    }
    return nil
}

更新/修复！将代码更改为此，并成功：

class func removeImage(user:User){
    let manager = NSFileManager.defaultManager()
    do{
        let directoryURL = try manager.URLForDirectory(.DocumentationDirectory, inDomain: .UserDomainMask, appropriateForURL: nil, create: true)
        if #available(iOS 9.0, *) {
            let url = NSURL(fileURLWithPath: "\(user.id)_\(user.name).png", relativeToURL: directoryURL)
            try manager.removeItemAtURL(url)
        } else {
            let url = directoryURL.URLByAppendingPathComponent("\(user.id)_\(user.name).png")
            try manager.removeItemAtURL(url)
        }
    }catch{

    }
}


class func saveImage(user:User,image:UIImage){
    let manager = NSFileManager.defaultManager()
    do{
        let directoryURL = try manager.URLForDirectory(.DocumentationDirectory, inDomain: .UserDomainMask, appropriateForURL: nil, create: true)
        if #available(iOS 9.0, *) {
            let url = NSURL(fileURLWithPath: "\(user.id)_\(user.name).png", relativeToURL: directoryURL)
            UIImagePNGRepresentation(image)!.writeToURL(url, atomically: true)
        } else {
            let url = directoryURL.URLByAppendingPathComponent("\(user.id)_\(user.name).png")
            UIImagePNGRepresentation(image)!.writeToURL(url, atomically: true)
        }
    }catch{

    }
}

class func getImage(user:User)->UIImage?{
    let manager = NSFileManager.defaultManager()
    do{
        let directoryURL = try manager.URLForDirectory(.DocumentationDirectory, inDomain: .UserDomainMask, appropriateForURL: nil, create: true)
        if #available(iOS 9.0, *) {
            let url = NSURL(fileURLWithPath: "\(user.id)_\(user.name).png", relativeToURL: directoryURL)
            if let data = NSData(contentsOfURL: url){
                return UIImage(data: data)
            }
        } else {
            let url = directoryURL.URLByAppendingPathComponent("\(user.id)_\(user.name).png")
            if let data = NSData(contentsOfURL: url){
                return UIImage(data: data)
            }
        }
    }catch{

    }
    return nil
}

---

我将使用NSURL重新开始，而不是强制转换为NSString以使用路径。好的，我将检查它。仍然是NSURL的相同问题，实际上解决了它！不确定为什么使用NSURL会起作用，而路径不会起作用…我将使用NSURL重新开始，而不是强制转换为NSString来使用路径。好的，我会检查它。仍然与NSURL相同的问题实际上解决了它！不知道为什么使用NSURL会起作用，但是路径不会。。。