Objective-C: from nullable pointer 'NSURL * _Nullable' to non-nullable pointer type 'NSURL * _Nonnull'

ios, nsurl, objective-c, xcode8

Solution

This is quite straightforward = all you need to do is assign the `_requestTokenUrl` to a variable before using it in a method call. This should be enough :

NSURL *url = _requestTokenUrl;
self.requestTokenRequest = [[OAMutableURLRequest alloc] initWithURL:url
                                                           consumer:_consumer
                                                              token:nil
                                                              realm:nil
                                                  signatureProvider:nil
                                                              nonce:nil
                                                          timestamp:nil];

Now, bear in mind that this simply silences the warning. Since your `_requestTokenUrl` is `nullable` and the method expects a `nonnull` object, you should check if `_requestTokenUrl` is actually non-nil. So the more appropriate version would look like this :

NSURL *url = _requestTokenUrl;
if (url != nil) {
    self.requestTokenRequest = [[OAMutableURLRequest alloc] initWithURL:url
                                                               consumer:_consumer
                                                                  token:nil
                                                                  realm:nil
                                                      signatureProvider:nil
                                                                  nonce:nil
                                                              timestamp:nil];
} else {
    // `_requestTokenUrl` was nil, act accordingly
}

The assignement to a variable is still required though.

Problem

I'm trying to convert `NSURL * _Nullable` to non-nullable. By any chance any of you knows how can I do this?. Here is some context: I'm trying to use ios-oauthconsumer, and I'm trying to initialize some objects: ``` self.requestTokenRequest = [[OAMutableURLRequest alloc] initWithURL:_requestTokenUrl consumer:_consumer token:nil realm:nil signatureProvider:nil nonce:nil timestamp:nil]; ``` They are been initialize by this init: ``` - (id)initWithURL:(NSURL *)aUrl consumer:(OAConsumer *)aConsumer token:(OAToken *)aToken realm:(NSString *)aRealm signatureProvider:(id<OASignatureProviding>)aProvider nonce:(NSString *)aNonce timestamp:(NSString *)aTimestamp { if ((self = [self initWithURL:aUrl consumer:aConsumer token:aToken realm:aRealm signatureProvider:aProvider])) { nonce = [aNonce copy]; timestamp = [aTimestamp copy]; } return self; } ``` if I po I get this: and I try to use that object. I get this warning: I'll really appreciate if any of you knows how to convert _Nullable to non-Nullable object.

Original source