Autolayout uitableviewcell issues

-(void) configure {
    questionButtons=[NSMutableArray new];
    UIView *top=self.outerview;
    top.translatesAutoresizingMaskIntoConstraints=NO;
//    self.outerview.backgroundColor=[UIColor lightGrayColor];
    UIView *previousView=top;
    for(int i=0;i<4;i++) {


        UIButton *questionButton= [RadioButton buttonWithType:UIButtonTypeCustom];
        [questionButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
        [questionButton setImage:[UIImage imageNamed:@"checked"] forState:UIControlStateSelected];
        [questionButton setImage:[UIImage imageNamed:@"unchecked"] forState:UIControlStateNormal];

        [questionButton setTitle:[NSString stringWithFormat:@"Question %d",i] forState:UIControlStateNormal];
        [top addSubview:questionButton];
        questionButton.translatesAutoresizingMaskIntoConstraints=NO;
        NSLayoutConstraint *leadingSpace=[NSLayoutConstraint constraintWithItem:questionButton attribute:NSLayoutAttributeLeading relatedBy:NSLayoutRelationEqual toItem:top attribute:NSLayoutAttributeLeading multiplier:1 constant:5];
        NSLayoutConstraint *trailingSpace=[NSLayoutConstraint constraintWithItem:top attribute:NSLayoutAttributeTrailing relatedBy:NSLayoutRelationEqual toItem:questionButton attribute:NSLayoutAttributeTrailing multiplier:1 constant:-5];
        NSLayoutConstraint *topSpaceToPrevious=[NSLayoutConstraint constraintWithItem:questionButton attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:previousView attribute:NSLayoutAttributeBottom multiplier:1 constant:5];

        if(i==0) {
            NSLayoutConstraint *topSpaceToContainer=[NSLayoutConstraint constraintWithItem:questionButton attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:top attribute:NSLayoutAttributeTop multiplier:1 constant:5];
            [top addConstraints:@[topSpaceToContainer,leadingSpace,trailingSpace]];
        }
        else if(i==3) {
            NSLayoutConstraint *bottomSpace=[NSLayoutConstraint constraintWithItem:top attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:questionButton attribute:NSLayoutAttributeBottom multiplier:1 constant:5];
            [top addConstraints:@[topSpaceToPrevious,leadingSpace,trailingSpace,bottomSpace]];
        }
        else{
            [top addConstraints:@[topSpaceToPrevious,leadingSpace,trailingSpace]];
        }
        previousView=questionButton;
        questionButton.tag=i;
        [questionButtons addObject:questionButton];
    }

    [NSTimer scheduledTimerWithTimeInterval:3 target:self selector:@selector(done) userInfo:nil repeats:NO];
}