Question

I am trying to make an app in iPhone since i am new so i require a little info over this matter.

I have few classes

Class 1
Class 2
Class 3
...
Class 10

I have a new NSObject Class “Utilities”. In this class i want to define some functions like

let’s say, pass a NSMutableDictonary and calculate average

-(void) calculateAvg:(NSMutableDictonary *)myDic
-(void) calculateMile:(NSMutableDictonary *)myDic
-(void) calculateAnythingElse:(NSMutableDictonary *)myDic

Now these are the functions that will be used in entire app classes, from 1 to 10. Instead of Putting these functions in each class i have made this Utilities Function.
In java i could do this

Utilities newUtil = new Utilties();
newUtil.callFunction();

However How can I do this in my iPhone, i am a bit confused if this is the work of Singleton set? Or i should use regular method by

Utilities newUtil = [Utilties alloc] init];

Then calling functions.

Now that this class will be used again and again in entire app classes

Answer 1

You can go with below steps:

1) Create NSObject Class “Utilities”, which you have done.

2) Add all methods which you want it as global. But with “+” instead of “-” like below:

+(void) calculateAvg:(NSMutableDictonary *)myDic
+(void) calculateMile:(NSMutableDictonary *)myDic
+(void) calculateAnythingElse:(NSMutableDictonary *)myDic

3) Import “Utilities.h” class first in “.pch” file.

4) That’s it. Done.

You can access all above methods throughout the app like below:

[Utilities calculateAvg:<dictionary_object>];

Means, no need to create object. You can access static methods by class name only.

Hope you got an idea.

Happy Coding!

Cheers!