在implementation.m文件中

- (void) viewWillAppear 
{
    [super viewWillAppear:animated];
    UIBarButtonItem *shareButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAction
                                    target:self
                                    action:@selector(shareAction:)];
    self.navigationItem.rightBarButtonItem = shareButton;
}

-(void)shareAction:(id)sender
{
    NSLog(@"share action");
}

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Swift

let shareBar: UIBarButtonItem = UIBarButtonItem.init(barButtonSystemItem:.Action, target: self, action: Selector("userDidTapShare"))

    self.navigationItem.rightBarButtonItem = shareBar

     func userDidTapShare() {
          //Implementation goes here ...
    }

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Swift 3.0
在viewDidLoad中编写此代码

let btnShare = UIBarButtonItem(barButtonSystemItem:.action, target: self, action: #selector(btnShare_clicked))
        self.navigationItem.rightBarButtonItem = btnShare

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共享按钮操作

func btnShare_clicked() {
        print("Share button clicked")
    }

型