CODEWITHSUNDEEP
iosobjective-c
SanitLee
SanitLee

Reputation: 1253

Objective C syntax issue related to parameter not getting right data

I've been working on a project implementing Hola CDN framework. I'm now running into an issue that I can't pass on current date to the parameter programDay and I traced the source code and I found the below line. What does this below line mean?

self.programDay = ![dict[GETPROGRAMLISTDATA_PROGRAMEDAY] isEqual:[NSNull null]] ? dict[GETPROGRAMLISTDATA_PROGRAMEDAY] : nil;

Upvotes: 0

Views: 40

Answers (2)

Lumialxk
Lumialxk

Reputation: 6379

What's NSNull
[NSNull null] doesn't equal to nil. It means empty value. For example, @[[NSNull null]].count equals to 1. NSNull is used as placeholder in NSArray and NSDictionary. It means nil.
For your question
This line is used to replace NSNull with nil.

Upvotes: 2

sschunara
sschunara

Reputation: 2283

self.programDay = ![dict[GETPROGRAMLISTDATA_PROGRAMEDAY] isEqual:[NSNull null]] ? dict[GETPROGRAMLISTDATA_PROGRAMEDAY] : nil;

This line means that if [dict[GETPROGRAMLISTDATA_PROGRAMEDAY] has empty value or null value the nil would be assign to self.programDay as there would be value of [dict[GETPROGRAMLISTDATA_PROGRAMEDAY] will be assign to self.programDay. Usually (null) value is return from webservice if that value is not presented in database on server.

Upvotes: 1

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