How to position a UIToolbar in a UIWebView - objective-c

Question

I've a sample project, where I have created a custom UIWebView named WebView. They are added to the view in a UIViewController. Two WebView's are initialized in the viewDidLoad and added to an array list. The first one is added as subview på self.view. The Storyboard contains a UIBarButton, and when this is tapped, the second WebView is added as subview to the self.view.
- (void)viewDidLoad
{
[super viewDidLoad];
WebView *webView1 = [[WebView alloc] initWithFrame:self.view.bounds];
WebView *webView2 = [[WebView alloc] initWithFrame:self.view.bounds];
self.webViews = [NSArray arrayWithObjects: webView1, webView2, nil];
UIWebView *webView = [self.webViews objectAtIndex:0];
[self.view addSubview:webView];
[webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:#"http://m.google.com/"]]];
}
Here is the implementation of the WebView where a toolbar is added to the bottom (-50px) of the view:
#implementation WebView
- (void) initToolbar {
UIToolbar *toolbar = [UIToolbar new];
toolbar.barStyle = UIBarStyleBlackTranslucent;
toolbar.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleTopMargin;
[toolbar sizeToFit];
toolbar.frame = CGRectMake(0, self.frame.size.height-80, 320, 30);
[self addSubview:toolbar];
}
- (id)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
self.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
[self initToolbar];
}
return self;
}
#end
The problem is, that the toolbar does not have the same position in the two views (they could be positioned like the first one). Why are they not positioned equally?
You can download the small sample project here:
http://uploads.demaweb.dk/UIWebView.zip
My notes: As mentioned, the two WebView's are currently initialized in the viewDidLoad. If I instead wait and first initialize then when I need them, it seems to work as expected.

Answer 1

The thing here is that self.frame.size.height on viewDidLoad is not the same when you initialize it via the button click. If you add the UIWebView directly in viewDidLoad, the UINavigationBar of your UINavigationController is not loaded yet and the frame of self.view is 'perceived' to be (not really, because it is) larger.
This explains the difference of 40.0 (?) points.
One possible solution to this problematic behaviour is to initialize and add (at least the first) instance of UIWebView in the viewWillAppear:animated method. (UIViewController does already implement this method)