CODEWITHSUNDEEP
iosobjective-cintnsarraytype-conversion
Eliza Wilson
Eliza Wilson

Reputation: 1101

How can an int be converted into an id?

I have an array, and the contents of it are objects of type id, but I need to turn them into type int. Is there any way I can make the array read the data as ints, or turn the id into an int? 

    NSArray *array = [string componentsSeparatedByString:@"\n"];

    int foo = array[0];  /*Warning: Incompatible pointer to integer conversion initializing 'int' with an expression of type 'id' */

Upvotes: 0

Views: 1949

Answers (2)

stosha
stosha

Reputation: 2148

You should use intValue to convert to int.

int object1 = [fileContents[0] intValue];

Upvotes: 2

Lukas Kukacka
Lukas Kukacka

Reputation: 7704

componentsSeparatedByString: docs says:

Return value

An NSArray object containing substrings from the receiver that have been divided by separator.

So your fileContents contains an array of NSStrings. fileContents[0] is then the first NSString instance in the array. And you can convert NSString to int or preferably NSInteger by calling

[string intValue];
[string integerValue];

So your code should look like this (assuming array contains at least 1 object, don't forget to check this):

int object1 = [fileContents[0] intValue];

Or even better include typecasting for better code readability

int object1 = [(NSString *)fileContents[0] intValue];

Upvotes: 4

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