NSSearchPathForDirectoriesInDomains

NSArray *NSSearchPathForDirectoriesInDomains(

NSSearchPathDirectory directory,

NSSearchPathDomainMask domainMask,

BOOL expandTilde);

参数

directory 类型有很多，说几个常用的

    NSLibraryDirectory,                     // various documentation, support, and configuration files, resources (Library)
    NSDeveloperDirectory,                   // developer resources (Developer) DEPRECATED - there is no one single Developer directory.
    NSUserDirectory,                        // user home directories (Users)
    NSDocumentationDirectory,               // documentation (Documentation)
    NSDocumentDirectory,                    // documents (Documents)

    NSCachesDirectory           // location of discardable cache files (Library/Caches)

domainMask

    NSUserDomainMask ,       // user's home directory --- place to install user's personal items (~)
    NSLocalDomainMask ,      // local to the current machine --- place to install items available to everyone on this machine (/Library)