iOS 导航栏、状态栏和底部横条高度

//navigation height
//系统导航栏高度
    CGRect rectNav = self.navigationController.navigationBar.frame;
//系统状态栏的高度
    CGRect rectStatus = [[UIApplication sharedApplication] statusBarFrame];
//状态栏+导航栏的高度
    CGFloat nav_status_height = rectStatus.size.height + rectNav.size.height;

    UIEdgeInsets safeAreaInsets = [[UIApplication sharedApplication] keyWindow].safeAreaInsets;
    CGFloat bottomBarHeight = safeAreaInsets.bottom;
    NSLog(@"底部横条高度：%f", bottomBarHeight);