iOS Basic errors

[Kapthehat]

I am working through Apress beginning IOS Development and am encountering some basic errors - which I can't seem to get my head around. These all relate to the project in chapter 6.0.

I have attached some screenshots - which show the errors and code. All help gratefully appreciated. Thanks

regards

Kaps

 

[robbieduncan]

1) The Interface and Implementation should never be in the same file.

 

[Kapthehat]

Basic errors

Thanks - so which one do I need to remove ?

 

[robbieduncan]

Thanks - so which one do I need to remove ?

Interface goes in the .h file, implementation in the .m. I'm pretty sure XCode will have set up the template/empty files like this anyway.

 

[PriapusZA]

As above - the .h (header file) should never have an @implimentation in it. It is used for declaring properties and methods. No "executable code" should ever go in there.

Think of the files like this:

The .h file:

This is like the index of a book - likes what the class is about - and it's properties

The .m
Is like a workshop manual - tells you how to do a set of instructions and the "working code" behind it.

Examples:

header file.h 


#import <UIKit/UIKit.h>

@interface SomeClass : SomeSubClass

@property (copy, nonatomic) IBOutlet UIButton *fooButton; 
@end

So now we know that this class has a UIButton named Foo - what does this button actually do?

That's where our implementation file comes into play ...

#import "SomeClass.h"

@implementation ViewController

- (UIButton*)fooButton
{
   //Puts up an alert view, saying hello 

  //Code in here to make that happen

}


@end

I hope this clears up for issues a little and makes it clearer.

 

[Kapthehat]

Thank you. I now have one error - stating that @end is missing in "BIDBlueViewController". See attached screenshots.

 

[PriapusZA]

Thank you. I now have one error - stating that @end is missing in "BIDBlueViewController". See attached screenshots.

Right at the bottom of the class should have that - screen shot does't show the bottom of that class.


Just make sure

@end

is the last line of code in that class.

 

[Kapthehat]

basic errors

Thanks everybody !!! got it working