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POBuild a tabbar view controller from scratch
 

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  1. POBuild a tabbar view controller from scratch
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    <p>Apple's tab bar controller has a lot of limitations. One important limitation is that you can't modify the tab bar in a rejection safe mode. My tab bar has a simple sliding movements and it's multi row. For those reasons I decided to build a TBVC from the beginning; everything seems to work correctly, but I'm really messing around with rotation. Every time that I change orientation main view frames are changed.</p> <p>Here is my hierarchy from top to the container view: -MainView--contains-->TabBarView+containerView The containerView is the view used to contain views loaded from the other controllers. Here is the -loadView method of my CustomTabBaViewController</p> <pre><code>- (void)loadView { UIView *theView=[[UIView alloc]initWithFrame:[[UIScreen mainScreen]bounds]]; theView.autoresizingMask=UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth; theView.backgroundColor=[UIColor greenColor]; containerOfControllersView=[[UIView alloc] initWithFrame:theView.bounds]; containerOfControllersView.backgroundColor=[UIColor blueColor]; containerOfControllersView.autoresizingMask=UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth; [theView addSubview:containerOfControllersView]; ideoloTabBar=[[IdeoloTabBar alloc]initWithNumberOfControllers:[controllers count]]; [theView addSubview:ideoloTabBar]; self.view=theView; [theView release]; } </code></pre> <p>When I set a new view from another controller I use this method:</p> <pre><code>-(void)setCurrentViewWithView:(UIView*)theView{ if ([[self.containerOfControllersView subviews] count]&gt;0) { UIView *tagView=[self.containerOfControllersView viewWithTag:555]; tagView.tag=0; [tagView removeFromSuperview]; } theView.tag=555; theView.autoresizingMask=UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth; theView.frame=[[UIScreen mainScreen]applicationFrame]; [self.containerOfControllersView addSubview:theView]; [self.view bringSubviewToFront:ideoloTabBar]; } </code></pre> <p>As you can see the views from other view controllers are applied using the applicationFrame.</p> <p>When I rotate the device happens something wrong, the mainview not only is resized according to the new orientation but also moved by 20px (status bar size) to the botton, thus leaving a gap between the status bar and the container view. Since I gave the mainview the screen bounds I can't understand with it should be moved.</p> <p><strong>UPDATE</strong></p> <p>I'm trying a different approach so I've modified the loadView like that:</p> <pre><code>- (void)loadView { [super loadView]; containerOfControllersView=[[UIView alloc] initWithFrame:self.view.bounds]; containerOfControllersView.backgroundColor=[UIColor blueColor]; containerOfControllersView.autoresizingMask=UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth; self.view.backgroundColor=[UIColor greenColor]; [self.view addSubview:containerOfControllersView]; ideoloTabBar=[[IdeoloTabBar alloc]initWithNumberOfControllers:[controllers count]]; [self.view addSubview:ideoloTabBar]; } </code></pre> <p>And in the setCurrentViewWithView:(UIView*)theView I've modified the line with</p> <pre><code>theView.frame=self.view.bounds; </code></pre> <p>instead of using the applicationFrame.</p> <h3>NOW:</h3> <p>On iPhone when I try to load a modalView it cuts about 40px at the bottom On iPad when I try to load a modalView it lefts 20px at the bottom, because 20px are under the status bar but wantsFullScreen is NO.</p> <h3>UPDATE 2</h3> <p>It seems that the presentModalViewController should be called from the root view controller. I will create a protocol and an abstract UIViewController subclass to implement it an load it correctly.</p> <p>Any suggestion? work around?</p>
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    1. USPraveen Kumar Purushothaman
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