IOS 11和Xcode 9中的Navigationbar barbuttonitem错误框架

我有一个Viewcontroller，在其中设置了社交媒体的三个右侧Navbar按钮。以前，我在Xcode 8中运行应用程序。但是现在，当我将Xcode更新为9.1时，UI受到了干扰。导航栏会更改其宽度，现在会在整个导航栏中传播。该代码设置为宽度，但未按照代码运行。我的代码是这样的，

UIImage* image1 = [UIImage imageNamed:@"fab.png"];
CGRect frameimg1 = CGRectMake(3,0,30,30);
UIButton *someButton1 = [[UIButton alloc] initWithFrame:frameimg1];
[someButton1 setBackgroundImage:image1 forState:UIControlStateNormal];
[someButton1 addTarget:self action:@selector(facebook)
     forControlEvents:UIControlEventTouchUpInside];
[someButton1 setShowsTouchWhenHighlighted:YES];

UIBarButtonItem *mailbutton1 =[[UIBarButtonItem alloc] initWithCustomView:someButton1];

UIImage* image2 = [UIImage imageNamed:@"tt.png"];
CGRect frameimg2 = CGRectMake(20,50,30,30);
UIButton *someButton2 = [[UIButton alloc] initWithFrame:frameimg2];
[someButton2 setBackgroundImage:image2 forState:UIControlStateNormal];
[someButton2 addTarget:self action:@selector(twitter)
     forControlEvents:UIControlEventTouchUpInside];
[someButton2 setShowsTouchWhenHighlighted:YES];

UIBarButtonItem *mailbutton2 =[[UIBarButtonItem alloc] initWithCustomView:someButton2];

    UIImage *image3 = [UIImage imageNamed:@"G+.png"];
CGRect frameimg3 = CGRectMake(0,30,30,30);
UIButton *someButton3 = [[UIButton alloc] initWithFrame:frameimg3];
[someButton3 setBackgroundImage:image3 forState:UIControlStateNormal];
[someButton3 addTarget:self action:@selector(gmail)
     forControlEvents:UIControlEventTouchUpInside];
[someButton3 setShowsTouchWhenHighlighted:YES];

UIBarButtonItem *mailbutton3 =[[UIBarButtonItem alloc] initWithCustomView:someButton3];


[self.navigationItem setRightBarButtonItems:[NSArray arrayWithObjects:mailbutton1,mailbutton2,mailbutton3, nil]];

现在，当我在Xcode 9.1中运行该应用程序时，它会显示我的Navbar按钮，