ios - Objective-c UIScrollView now scrolling nor vertically nor horizontally -

i don't understand why project doesn't work. can open window, scrollview wont scroll, means can't see bottom of ui. why? read answers similar questions didn't me fix issue.

this detailvc.h

@interface detailvc : uiviewcontroller { iboutlet uiimageview *iv_main, *iv_ratings; iboutlet uitextfield *tf_name, *tf_dob, *tf_age, *tf_weight, *tf_height,*tf_birthplace; iboutlet uitextview *tv_description; iboutlet uibutton *but_movies, *but_edit; iboutlet uinavigationbar *navbar; iboutlet uiscrollview *scrollview;  }  @property (nonatomic, retain) iboutlet uiimageview *iv_main, *iv_ratings; @property (nonatomic, retain) iboutlet uitextfield *tf_name, *tf_dob, *tf_age, *tf_weight, *tf_height, *tf_birthplace; @property (nonatomic, retain) iboutlet uitextview *tv_description; @property (nonatomic, retain) iboutlet uibutton *but_movies, *but_edit; @property (nonatomic, retain) iboutlet uinavigationbar *navbar; @property (nonatomic, retain) iboutlet uiscrollview *scrollview; @end 

this detailvc.m

 #import "detailvc.h"   @interface detailvc ()   @end   @implementation detailvc   @synthesize iv_main, iv_ratings, tf_age, tf_birthplace, tf_dob, tf_height, tf_name, tf_weight, tv_description, but_edit, but_movies,navbar, scrollview;   - (id)initwithnibname:(nsstring *)nibnameornil bundle:(nsbundle *)nibbundleornil { self = [super initwithnibname:nibnameornil bundle:nibbundleornil]; if (self) {     // custom initialization } return self;   }  - (void)viewdidload { [super viewdidload]; // additional setup after loading view nib. scrollview.contentsize = cgsizemake(320, 1000);  }  - (void)didreceivememorywarning { [super didreceivememorywarning]; // dispose of resources can recreated. }  @end 

------connection inspector
http://s18.postimg.org/qjzrdz9a1/schermata_2013_08_07_alle_16_47_19.png

------scroll view attributed inspector
http://s8.postimg.org/5eniaq8r9/schermata_2013_08_07_alle_17_35_04.png

is there chance frame of uiscrollview has same size contentsize? if yes, uiscrollview think has enough frame display of content.