Question

CGRect type is a structure type. If I want to define a property as this type, should I use assign or retain attribute for this type?

@interface MyClass {
  CGRect rect;
  ...
}
@property (nonatomic, assign) CGRect rect; // or retain?

or I have to write my own getter and setter?

Answer 1

Only assign is possible for non-objects. (Before ARC, that includes CoreFoundation stuff, e.g. a CFArrayRef can only be assign.)

@property (nonatomic, assign) CGRect rect;
//                            ^^^^^^ don't forget.

You don’t need a custom getter and setter unless you don’t want to use memcpy for assignment.