Question

1.where did i find default location of nskeyedarchiver?

2.
app.h

@interface uiview(extensions) 

app.m

@implementation uiview(extensions)

what is the use of (extensions) like

@interface uiview(extensions) 

in objective c

pls give me a solution….

2 questions

Answer 1

app.h

@interface uiview(extensions)

app.m

@implementation uiview(extensions)

This is called Categories in iOS. You can write your own methods and implementations to the existing class. You can know more about this from Apple Documentation

Regarding KeyedArchiver, you can write the archived object to any place like Documents or any other folders of your choice. For more info, see Documentation