how to show avg of employees salary in a NSTextField using NSArrayController and cocoa bindings
- by Miraaj
Hi all,
I am new to cocoa bindings so I tried to make a simple application which will simply calculate avg of employees salary and display it in a text field, using cocoa bindings. I followed these steps:
Made the model class : Person with one property for now -
@property (readwrite, assign) int salary;
In the application delegate class I initialized a mutable array : personArray with certain objects like this:
Person *person1 = [[Person alloc] init];
person1.salary = 5000;
Person *person2 = [[Person alloc] init];
person2.salary = 15000;
Person *person3 = [[Person alloc] init];
person3.salary = 7000;
Person *person4 = [[Person alloc] init];
person4.salary = 9000;
Person *person5 = [[Person alloc] init];
person5.salary = 11000;
personArray= [[NSMutableArray alloc] initWithObjects:person1, person2, person3, person4, person5,nil];
In IB I dropped a NSArrayController object, set its mode as Class - Person, added key salary in attribute pane. Then in bindings pane, binded contents array to ApplicationDelegate class with model key path set to self.personArray.
Dropped a NSTextField on window. Binded its value to ArrayController object. Assigned controller key as - arrangedObjects. Assigned Model key path to @avg.salary
When I executed the application I found no value being displayed in the text field.
Can anyone suggest me where I may be wrong?
Thanks,
Miraaj
