if we added more codes in setter/getter methods, we must override them by ourself in inherited class.

if we added more codes in setter/getter methods, we must override them by ourself in inherited class.

@interface ParentClass:NSObject

@property (nonatomic) int type;

- (void)updateData;

@end

@implentation ParentClass

@synthesize type = _type;

- (void) setType:(int) pType {

    _type = pType;

    

    [self doSomething];   //added codes

}

- (void) updateData

{

    self.type ++;

    NSLog("%d",self.type);

}

- (void) doSomething

{

    NSLog(@"ParentClass:doSomething called!!");

}

@end

@interface ChildClass: ParentClass

@end

@implementation ChildClass

@synthesize type = _type;

- (void) updateData {

    [super updateData];    // doSomething is not called!!

}

- (void) doSomething

{

   NSLog(@"ChildClass:doSomething called!!");

}

@end

changed this.

@implementation ChildClass

@synthesize type = _type;

- (void) setType:(int) pType {
    _type = pType;

    

    [self doSomething];
}

- (void) updateData {
    [super updateData];    // doSomething is called
}

- (void) doSomething
{
   NSLog(@"ChildClass:doSomething called!!");
}

@end

coz, @synthesize make default setter/getter methods by itself. so these methods are different from them that you implemented in super class.