updating custom uiview's frame after adding subviews to it - ios

Question

I am having a big mental block figuring out something I think easy. Please see this very short video: http://screencast.com/t/eaW7rbECv4Ne.
I would like to draw a rectangle in my layoutSubviews method around the whole area that covers the subviews. I currently draw yellow rect around each term as you can see in the video.
I have a StatementView. In each key tap I am creating new objectView and adding it to my StatementView like below. I add the objectViews to a containerView and try to get the origin and size of the containerView in order to draw the stroke around it. However, it always gives me 0.
How should I update containerViews bounds values after I add the subviews to it?
// Created by ilteris on 1/31/15.
// Copyright (c) 2015 ilteris. All rights reserved.
#implementation QWZStatementView
-(id)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
self.userInteractionEnabled = NO;
self.textField = [[MyUITextField alloc] initWithFrame:CGRectMake(0, 0, 0, 0)];
self.textField.inputView = [LNNumberpad defaultLNNumberpad];
self.textField.delegate = self;
self.isNumerator = NO;
self.isDenominator = NO;
[self addSubview:self.textField];
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(statementOneTextFieldChanged:) name:UITextFieldTextDidChangeNotification object:nil];
self.containerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 0, 0)];
[self addSubview:self.containerView];
self.autoresizesSubviews = YES;
self.objectsArray = [NSMutableArray arrayWithCapacity:1];
self.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin;
}
return self;
}
-(void)statementOneTextFieldChanged:(NSNotification *)notification {
NSLog(#"statementOneTextFieldChanged");
QWZObjectView *objectView = [[QWZObjectView alloc] initWithFrame:self.bounds];
[self.containerView addSubview:objectView];
QWZTerm* term = [QWZQuestionDetailViewController createAndReturnCoreDataTermForJSONDict:objectData];
[objectView createTerm:term];
[self.objectsArray addObject:objectView];
[self setNeedsLayout];
}
- (void)layoutSubviews {
NSLog(#"layoutSubviews StatementView");
[super layoutSubviews];
CGSize totalSize = CGSizeMake(0, 0);
for (QWZObjectView* objectView in self.objectsArray) {
CGSize textSize = objectView.bounds.size;
objectView.frame = CGRectMake(totalSize.width , totalSize.height, textSize.width , textSize.height);
totalSize.width = textSize.width + totalSize.width;
}
CGRect bounds = self.containerView.bounds;
/*
NSLog(#"self.containerView.bounds is %#", NSStringFromCGRect(self.containerView.bounds)); //always 0.
bounds.origin = CGPointMake(totalSize.width/2, self.containerView.bounds.origin.y); //adding this code didn't help at all.
CGFloat borderWidth = 2.0f;
self.bounds = CGRectInset(self.bounds, -borderWidth, -borderWidth);
self.layer.borderColor = [UIColor redColor].CGColor;
self.layer.borderWidth = borderWidth;
*/
bounds.origin = CGPointMake(totalSize.width/2, self.containerView.bounds.origin.y);
self.containerView.bounds = bounds;
}
#end