[iOS] 取得外部IP

 

- (NSString *)externalIPAddress {

    // see https://stackoverflow.com/questions/27708887/objective-c-how-to-get-the-public-ip-address-of-the-device/27709110#27709110

    // http://myipdoc.com/ip.php

    NSString *publicIP = [NSStringstringWithContentsOfURL:[NSURLURLWithString:@"https://icanhazip.com/"] encoding:NSUTF8StringEncodingerror:nil];

    publicIP = [publicIP stringByTrimmingCharactersInSet:[NSCharacterSetnewlineCharacterSet]];

    return publicIP;

 

}