Objective-C - NSTimer: unrecognized selector sent to class - call method from another class

Question

addCloudOne is a method within the Food class. The following code produces a crash with the following error:

+[Food addCloudOne]: unrecognized selector sent to class 0x1000ad760

    SEL selector = @selector(addCloudOne);
    [NSTimer scheduledTimerWithTimeInterval:k1 target:[Food class] selector:selector userInfo:nil repeats:YES];

Do you have ideas?

Answer 1

You need to specify an instance of the Food class, so this argument is incorrect:

target:[Food class]

So what you are passing to NSTimer is a Class object, not a Food object.

Instead you probably need an instance variable of the Food instance and specify that:

@interface MyClass ()
{
    Food *_food;
}

@implementation MyClass
...
- (void)whatever
{
    _food = [Food new];             // This might need to be elsewhere
    SEL selector = @selector(addCloudOne);
    [NSTimer scheduledTimerWithTimeInterval:k1
                                     target:_food
                                   selector:selector
                                   userInfo:nil
                                    repeats:YES];
}