How to concatenate an nsstring url

How can I concatenate an NSString URL? For example:

http://isomewebsite.com/username开发者_开发技巧=[someuservariable]&password=[somevariable]

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Try with below code.

NSString* myURLString = [NSString stringWithFormat:@"somewebsite.com/username=%@&password=%@", myUserName,myPassword];
NSURL *url = [NSURL URLWithString:myURLString];

Here is the blog tutorial will help you know more about Handling url authentication challenges accessing password protected servers

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You can use the method stringWithFormat of NSString:

NSString *url = [NSString stringWithFormat:@"somewebsite.com/username=%@&password=%@", someuservariable, some variable];

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Try this excellent post - URL encoding an NSString on iOS