无法从其他类调用实例方法

Question

I hope you can help me with the following problem in Objective-C. I´ve been sitting around for two hours now, but I have no idea what´s wrong.

Here´s my code:

BMICalc.h:

#import <UIKit/UIKit.h>

@interface BMICalc : UIViewController <UIPickerViewDataSource, UIPickerViewDelegate>

@property (strong, nonatomic) NSMutableArray *bmiArray;

-(int)bmiRows;

@end

BMICalc.m:

#import "BMICalc.h"

@implementation BMICalc

@synthesize bmiArray;

- (int) bmiRows
{
    if (!bmiArray)
    {
      bmiArray = [[NSMutableArray alloc] init];
    }
    return [bmiArray count];
}

@end

Now I want to create a object of BMICalc in another class called BMIDiaryController:

BMIDiaryController.m:

#import "BMIDiaryController.h"
#import "BMICalc.h"

@interface BMIDiaryController ()

@end

@implementation BMIDiaryController

- (void)viewDidLoad
{
    [super viewDidLoad];

    BMICalc *bmiSender = [[BMICalc alloc] init];

    int bmiVariable = [bmiSender bmiRows];       
}

@end

So when I start the programme i get the following error: "No visible @interface for 'BMICalc' declares the selector 'bmiRows'

I can´t call the method "bmiRows" with the object "bmiSender" (both of Class "BMICalc"

I hope you can help me with this. I searched and searched...I think it´s just a small thing, but I won´t see it...

Thank you and regards,

Stefan

Answer 1

Try creating a new project. Then add the BMICalc.m and BMICalc.h files. Try to instantiate your BMICalc object and call the bmiRows method from the appDelegate just to test it. There could be any number of things wrong in your main project that may be interfering with the class. At least doing this will confirm that you aren't crazy and that this code isn't the problem :)