NSFileManager唯一的文件名 [英] NSFileManager unique file names
问题描述
我需要一种快速简便的方法来在iOS上存储具有唯一文件名的文件。我需要在文件前添加一个字符串,然后将生成的唯一标识符附加到末尾。我希望 NSFileManager
有一些方便的方法来做到这一点,但我似乎无法找到它。
I need a quick and easy way to store files with unique file names on iOS. I need to prefix the file with a string, and then append the generated unique identifier to the end. I was hoping NSFileManager
had some convenient method to do this, but I can't seem to find it.
我在查看 createFileAtPath:contents:attributes:
,但我不确定属性是否会给我这个唯一的文件名。
I was looking at createFileAtPath:contents:attributes:
, but am unsure if the attributes will give me that unique file name.
推荐答案
创建自己的文件名:
CFUUIDRef uuid = CFUUIDCreate(NULL);
CFStringRef uuidString = CFUUIDCreateString(NULL, uuid);
CFRelease(uuid);
NSString *uniqueFileName = [NSString stringWithFormat:@"%@%@", prefixString, (NSString *)uuidString];
CFRelease(uuidString);
@darrinm在评论中提出的更简单的替代方案:
A simpler alternative proposed by @darrinm in the comments:
NSString *prefixString = @"MyFilename";
NSString *guid = [[NSProcessInfo processInfo] globallyUniqueString] ;
NSString *uniqueFileName = [NSString stringWithFormat:@"%@_%@", prefixString, guid];
NSLog(@"uniqueFileName: '%@'", uniqueFileName);
NSLog输出:
uniqueFileName:'MyFilename_680E77F2-20B8-444E-875B- 11453B06606E-688-00000145B460AF51'
NSLog output:
uniqueFileName: 'MyFilename_680E77F2-20B8-444E-875B-11453B06606E-688-00000145B460AF51'
注意:iOS6引入了NSUUID类,可用于代替CFUUID。
Note: iOS6 introduced the NSUUID class which can be used in place of CFUUID.
NSString *guid = [[NSUUID new] UUIDString];
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