Best practice to calculate view size within loadView method - ios

Question

What is the best practice to calculate the view size in the loadView method (in an UIViewController) without a XIB file?
Here is my solution:
- (void)loadView {
//Calculate Screensize
BOOL statusBarHidden = [[UIApplication sharedApplication] isStatusBarHidden ];
BOOL navigationBarHidden = [self.navigationController isNavigationBarHidden];
BOOL tabBarHidden = [self.tabBarController.tabBar isHidden];
CGRect frame = [[UIScreen mainScreen] bounds];
if (!statusBarHidden) {
frame.size.height -= [[UIApplication sharedApplication] statusBarFrame].size.height;
}
if (!navigationBarHidden) {
frame.size.height -= self.navigationController.navigationBar.frame.size.height;
}
if (!tabBarHidden) {
frame.size.height -= self.tabBarController.tabBar.frame.size.height;
}
UIView *v = [[UIView alloc] initWithFrame: frame];
[v setBackgroundColor: [UIColor whiteColor] ];
[v setAutoresizingMask: UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight ];
[self setView: v ];
[v release];
}
Is this code okay, or should I edit something?

Answer 1

The docs recommend using [[UIScreen mainScreen] applicationFrame] to get the screen bounds without the status bar

Answer 2

so for anyone who want to know a best practice example:
#pragma mark -
#pragma mark LoadView Methods
- (void)loadView {
//Calculate Screensize
BOOL statusBarHidden = [[UIApplication sharedApplication] isStatusBarHidden ];
BOOL navigationBarHidden = [self.navigationController isNavigationBarHidden];
BOOL tabBarHidden = [self.tabBarController.tabBar isHidden];
BOOL toolBarHidden = [self.navigationController isToolbarHidden];
CGRect frame = [[UIScreen mainScreen] applicationFrame];
//check if you should rotate the view, e.g. change width and height of the frame
BOOL rotate = NO;
if ( UIInterfaceOrientationIsLandscape( [UIApplication sharedApplication].statusBarOrientation ) ) {
if (frame.size.width < frame.size.height) {
rotate = YES;
}
}
if ( UIInterfaceOrientationIsPortrait( [UIApplication sharedApplication].statusBarOrientation ) ) {
if (frame.size.width > frame.size.height) {
rotate = YES;
}
}
if (rotate) {
CGFloat tmp = frame.size.height;
frame.size.height = frame.size.width;
frame.size.width = tmp;
}
if (statusBarHidden) {
frame.size.height -= [[UIApplication sharedApplication] statusBarFrame].size.height;
}
if (!navigationBarHidden) {
frame.size.height -= self.navigationController.navigationBar.frame.size.height;
}
if (!tabBarHidden) {
frame.size.height -= self.tabBarController.tabBar.frame.size.height;
}
if (!toolBarHidden) {
frame.size.height -= self.navigationController.toolbar.frame.size.height;
}
UIView *v = [[UIView alloc] initWithFrame: frame];
v.backgroundColor = [UIColor whiteColor];
v.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
self.view = v;
[v release]; //depends on your ARC configuration
}

Answer 3

You are adjusting the height depend on the status bar and navigation bars.. But you have not done anything with respect to the origin of the view.