SFSafariViewController 隐藏头部和尾部

    SFSafariViewControllerConfiguration * config = [[SFSafariViewControllerConfiguration alloc] init];
//禁止滚动
    config.barCollapsingEnabled = NO;
    SFSafariViewController * vc = [[SFSafariViewController alloc] initWithURL:[NSURL URLWithString:@"https://www.jianshu.com/u/9651a86c22ec"] configuration:config];
//隐藏 头尾导航
    [vc performSelector:NSSelectorFromString(@"_setShowingLinkPreviewWithMinimalUI:") withObject:[NSNumber numberWithBool:NO]];