swift - FileManager 抛出什么错误？

Question

FileManager 的方法会抛出哪些错误？具体来说，我对 attributesOfItem(atPath:) 抛出的错误感兴趣.

这就是我想使用它的方式:

do {
    let inode = try FileManager.default.attributesOfItem(atPath: somePath)[.systemFileNumber]
} catch SomeError.someSpecificError (let someContext) {
    /* implementation omitted... */
}

Answer 1

可以像下面这样(更多文件相关常量见CocoaError文档)

do {
    let inode = try FileManager.default.attributesOfItem(atPath: somePath)[.systemFileNumber]
} catch CocoaError.fileNoSuchFile {
    print("Error: no such file exists")
} catch CocoaError.fileReadNoPermission {
    print("Error: you don't have permissions")
} catch {
    // something unknown
}