iphone - managing keyboard in ios for number of textfields -

everything fine me except 1 case. when begin editing textfield, keyboard shown: method getting called, without resigning first 1 if edit next textfield, method not getting called.

- (void)registerforkeyboardnotifications {     [[nsnotificationcenter defaultcenter] addobserver:self                                              selector:@selector(keyboardwasshown:)                                                  name:uikeyboarddidshownotification object:nil];      [[nsnotificationcenter defaultcenter] addobserver:self                                              selector:@selector(keyboardwillbehidden:)                                                  name:uikeyboardwillhidenotification   object:nil];  }        -(void)keyboardwasshown:(nsnotification*)anotification       {       nsdictionary* info = [anotification userinfo];       cgsize kbsize = [[info objectforkey:uikeyboardframebeginuserinfokey] cgrectvalue].size;        uiedgeinsets contentinsets = uiedgeinsetsmake(0.0, 0.0, kbsize.height, 0.0);       testscroll.contentinset = contentinsets;      testscroll.scrollindicatorinsets = contentinsets;        cgrect arect = self.view.bounds;        cgpoint activepoint= [active.superview convertpoint:active.frame.origin toview:nil];     if (!cgrectcontainspoint(arect, activepoint) ) {         cgpoint scrollpoint = cgpointmake(0.0, active.frame.origin.y+active.frame.size.height-kbsize.height+100);// here active particular textfields , changing in begin editing method.         [testscroll setcontentoffset:scrollpoint animated:yes];     } 

here problem though switching between 2 text fields scrollview has set particular offset.

thank you.