Present系统原生分享框架 不兼容 , 选择短信Message的时候，导航栏cancel按钮被遮盖

````
UIActivityViewController` *actContr = [[UIActivityViewController alloc] initWithActivityItems:@[screenImage] applicationActivities:nil];
[self presentViewController:actContr animated:YES completion:nil];
````
系统原生分享，选择短信Message，Present MFMessageComposeViewController 的时候，导航栏被遮盖，导致 cancel 按钮无法点击 dismiss。
找了很久，发现当屏蔽 如下的 method 交换，恢复正常，求这个问题该如何解决？

````
@implementation UINavigationController (FDFullscreenPopGesture)
+ (void)load{
SEL originalSelector = @selector(pushViewController:animated:);
SEL swizzledSelector = @selector(fd_pushViewController:animated:);
........
}
````