CGFloat naviBarHeight = self.navigationController.navigationBar.frame.size.height;
CGFloat tabbarHeight = self.tabBarController.tabBar.frame.size.height;
CGFloat statusbarHeight = [UIApplication sharedApplication].statusBarFrame.size.height;
CGFloat viewHeight = self.view.frame.size.height;
CGFloat applicationHeight = [UIScreen mainScreen].applicationFrame.size.height;
CGFloat boundHeight = [UIScreen mainScreen].bounds.size.height;
// applicationHeight = 548
// statusbarHeight = 20
// boundHeight = 568
// viewHeight = 568
// tabbarHeight = 49
// naviBarHeight = 44