//状态栏高度
+ (CGFloat)navStatusBarHeight;
//标题栏高度
+ (CGFloat)navTitleBarHeight;
//状态栏 + 标题栏 高度
+ (CGFloat)statusBarAndNavTitleBarHeight;
//tabbar高度
+ (CGFloat)tabbarBarHeight;

//状态栏高度

• (CGFloat)navStatusBarHeight
  {
  return [[UIApplication sharedApplication] statusBarFrame].size.height;

}
//标题栏高度

• (CGFloat)navTitleBarHeight
  {
  UINavigationController *navController = //获取导航栏控制器
  if ([navController isKindOfClass:[UINavigationController class]]) {
  return navController.navigationBar.frame.size.height;
  }else
  {
  UINavigationBar *navBar = [UINavigationBar new];
  return navBar.frame.size.height;
  }
  }

//状态栏 + 标题栏 高度

• (CGFloat)statusBarAndNavTitleBarHeight
  {
  return [self navStatusBarHeight] + [self navTitleBarHeight];
  }

//tabbar高度

• (CGFloat)tabbarBarHeight
  {
  if (//判断tabbar控制器是否存在) {
  return //返回tabbarController.tabBar.frame.size.height;
  }else
  {
  UITabBar *tabbar = [[UITabBar alloc] init];
  return tabbar.frame.size.height;
  }
  }