在MacOS下很多操作是需要管理員權限的， 比如我們運行chmod，在命令行下可以使用sudo chmod來申請以管理員權限運行。但是使用XCode寫的程序是不能使用sudo的。

需要自己寫代碼來申請權限。下面是一個例子， 以管理員身份運行chmod 777

bool ChmodFileWithElevatedPrivilegesFromLocation(NSString *location) {// Create authorization referenceOSStatus status;AuthorizationRef authorizationRef;status = AuthorizationCreate(NULL, kAuthorizationEmptyEnvironment, kAuthorizationFlagDefaults, &authorizationRef);if (status != errAuthorizationSuccess){NSLog(@"Error Creating Initial Authorization: %d", status);return NO;}AuthorizationItem right = {kAuthorizationRightExecute, 0, NULL, 0};AuthorizationRights rights = {1, &right};AuthorizationFlags flags = kAuthorizationFlagDefaults | kAuthorizationFlagInteractionAllowed |kAuthorizationFlagPreAuthorize | kAuthorizationFlagExtendRights;status = AuthorizationCopyRights(authorizationRef, &rights, NULL, flags, NULL);if (status != errAuthorizationSuccess){NSLog(@"Copy Rights Unsuccessful: %d", status);return NO;}// use chmodchar *tool = "/bin/chmod";char *args[] = {"777", (char *)[location UTF8String], NULL};FILE *pipe = NULL;status = AuthorizationExecuteWithPrivileges(authorizationRef, tool, kAuthorizationFlagDefaults, args, &pipe);if (status != errAuthorizationSuccess){NSLog(@"Error: %d", status);return NO;}status = AuthorizationFree(authorizationRef, kAuthorizationFlagDestroyRights);return YES; }
調用方法

bool bRet = ChmodFileWithElevatedPrivilegesFromLocation("/Library"); if(bRet) {NSLog(@"error"); } else {NSLog(@"sucess"); }

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