適配原因：由于新出現(xiàn)的劉海屏，導(dǎo)致狀態(tài)欄高度和底部安全區(qū)域的高度變得不確定了; 在 iOS 13.0 之后，UIApplication 中的 statusBarFrame 屬性被廢棄??了。官方提供了 UIStatusBarManager 類中的 statusBarFrame 屬性來進(jìn)行獲取，具體代碼如下：

#pragma mark- 頂部狀態(tài)欄+導(dǎo)航欄
- (CGFloat)setupSafeTopHeight {
    CGFloat navHeight = 44;  // 導(dǎo)航欄固定高度
    CGFloat statusHeight = 20; // 狀態(tài)欄高度
    if (@available(iOS 13.0, *)) {
        NSSet *set = [UIApplication sharedApplication].connectedScenes;
        UIWindowScene *scene = [set anyObject];
        UIStatusBarManager *statusBarManager = scene.statusBarManager;
        statusHeight = statusBarManager.statusBarFrame.size.height;
    } else {
        statusHeight = [[UIApplication sharedApplication] statusBarFrame].size.height;
    }
    return navHeight + statusHeight;
}

#pragma mark- 底部導(dǎo)航欄+底部安全區(qū)域
- (CGFloat)setupSafeBottomHeight {
    CGFloat height = 49; // 底部導(dǎo)航欄固定高度
    if (@available(iOS 13.0, *)) {
        NSSet *set = [UIApplication sharedApplication].connectedScenes;
        UIWindowScene *scene = [set anyObject];
        UIWindow *window = scene.windows.firstObject;
        height = height + window.safeAreaInsets.bottom;
    } else if (@available(iOS 11.0, *)) {
        UIWindow *window = [UIApplication sharedApplication].windows.firstObject;
        height = height + window.safeAreaInsets.bottom;
    }
    return height;
}