xcode NSFileManager & NSFilePosixPermissions
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NSFileManager & NSFilePosixPermissions
提问by qwertz
I want to use the octal permissions (used for chmod) for NSFilePosixPermissions. Here is what I did now:
我想对 NSFilePosixPermissions 使用八进制权限(用于 chmod)。这是我现在所做的:
NSFileManager *manager = [NSFileManager defaultManager];
NSDictionary *attributes;
[attributes setValue:[NSString stringWithFormat:@"%d", 0777]
forKey:@"NSFilePosixPermissions"]; // chmod permissions 777
[manager setAttributes:attributes ofItemAtPath:@"/Users/lucky/Desktop/script" error:nil];
I get no error, but when I check the result with "ls -o" the permission are't -rwxrwxrwx.
我没有收到错误,但是当我用“ls -o”检查结果时,权限不是 -rwxrwxrwx。
What's wrong? Thanks for help.
怎么了?感谢帮助。
回答by gcbrueckmann
First, NSFilePosixPermissions
is the name of a constant. Its value may also be the same, but that's not guaranteed. The value of the NSFilePosixPermissions
constant could change between framework releases, e. g. from @"NSFilePosixPermissions"
to @"posixPermisions"
. This would break your code. The right way is to use the constant as NSFilePosixPermissions
, not @"NSFilePosixPermissions"
.
首先,NSFilePosixPermissions
是常量的名称。它的值也可能相同,但这并不能保证。NSFilePosixPermissions
常量的值可能会在框架版本之间发生变化,例如从@"NSFilePosixPermissions"
到@"posixPermisions"
。这会破坏你的代码。正确的方法是使用常量 as NSFilePosixPermissions
,而不是@"NSFilePosixPermissions"
。
Also, the NSFilePosixPermissions referencesays about NSFilePosixPermisions
:
此外,NSFilePosixPermissions 参考说NSFilePosixPermisions
:
The corresponding value is an
NSNumber
object. Use theshortValue
method to retrieve the integer value for the permissions.
对应的值是一个
NSNumber
对象。使用该shortValue
方法检索权限的整数值。
The proper way to set POSIX permissions is:
设置 POSIX 权限的正确方法是:
// chmod permissions 777
// Swift
attributes[NSFilePosixPermissions] = 0o777
// Objective-C
[attributes setValue:[NSNumber numberWithShort:0777]
forKey:NSFilePosixPermissions];
回答by Charlton Provatas
Solution in Swift 3
Swift 3 中的解决方案
let fm = FileManager.default
var attributes = [FileAttributeKey : Any]()
attributes[.posixPermissions] = 0o777
do {
try fm.setAttributes(attributes, ofItemAtPath: path.path)
}catch let error {
print("Permissions error: ", error)
}