Proper way to convert BOOL value into INT?

Question

Everytime when I tried to convert BOOL value into int. INT value is showing -8 for True and 0 for False. Ideally it should return 1 for true.

I have tried all possible ways of conversion like

int val=Info.isattachementDownloadable;
int val=[[NSString stringWithFormat:@"%d", Info.isattachementDownloadable] intValue];
int val=(int)Info.isattachementDownloadable;

where Info.isattachementDownloadable return BOOL

In all ways its showing -8 for TRUE.

Any suggestion ?

Solution 1

Maybe that will help(thought i don't know why it may be needed in the first place)

NSInteger i = @(YES).integerValue;

Hope that it helps you.

Solution 2

It is much quicker to do it like this:

BOOL myBool = YES;
int myInt = (myBool ? 1 : 0);

myInt will be 1 if myBool is YES, and 0 if myBool is NO.

Solution 3

It is always possible to use the object-oriented wrapper around numeric primitives (e.g. C's int). So am I answering the question? both yes and no depending on your viewpoint. However, here is what I prefer to use when using BOOL as input:

NSNumber *numval = [NSNumber numberWithBool:Info.isattachementDownloadable];

And if you really need to use the primitive datatype:

int val = [numval intValue];

Solution 4

BOOL myBool;    
int myInt;
if (myBool) myInt = 1;
else myInt = 0;

Solution 5

You can just assign BOOL value to int since YES and NO are just shortcuts for 1 and 0. You can also perform maths operations on BOOLs. FYI, BOOLs can even hold values from -128 up to 127 since they are just typedefs for signed chars.

BOOL someBool = YES;
int intFromBool = someBool;
NSLog(@"%d", intFromBool);

intFromBool -= YES;
NSLog(@"%d", intFromBool);

Reference: https://www.bignerdranch.com/blog/bools-sharp-corners/

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Comments

[Tariq]

this is pretty straightforward... but you are not doing any conversion ... is it conversion not possible ?

[Tariq]

Great that i was looking for :) ... i dont know why i missed this one :(

[Blindy]

Or even better, myBool!=0, or JavaScript's patented !!myBool.

[Alex Nichol]

I will point out that, for code that requires high efficiency, this is a poor method of converting a BOOL to an int because it allocates an object every time a conversion takes place.

[Ariel]

I agree, that it isn't fastest, nor memory friendly method, but it's objc straightest one that I know. Anyway, if you need efficiency - you can always fall back to plain c with int myInt = (someBool ? 1 : 0); as you've suggested in your answer. :)

[cncool]

@AlexNichol [NSNumber numberWithBool:YES] returns a singleton. There is a maximum of one allocation no matter how many times you call that.

[Albert Renshaw]

I may be wrong but don't BOOL's auto convert to this int value anyways in Obj-c when used as an int? For example NSLog(@"%i", YES+YES); logs 2

[turingtested]

This can be needed when you for example want to use the tag-property on a UIButton as a BOOL - whether the button is recently pressed or not. Then you don't need to declare any extra property for this in the controller.