如何将自定义菜单项添加到UITextView菜单，这是指向所选单词的维基百科页面的链接？ [英] How to add custom menu item to UITextView menu, which is a link to the Wikipedia page of the selected word?

问题描述

我是Xcode的新手，我使用的是版本4.6.3 - 新版本的Macbook太旧了。

I am new to Xcode, I am using version 4.6.3 - Macbook too old for the new version.

我环顾互联网和Stack Overflow并不能找到我想要的或者我无法获得片段工作。

I looked around the internet and Stack Overflow and cannot find what I want or I cannot get snippets to work.

我想在菜单项中添加一个菜单项，这些菜单项在UITextView中长按一个单词时出现。我希望它说Wiki，当按下它时，它将链接到所选单词的维基百科页面。它可能是通过Safari或者我应该在带有webview的应用程序中执行此操作吗？

I would like to add a menu item to the menu items that appear when longpressing a word in a UITextView. I want it to say "Wiki" and when this is pressed, it will link to the wikipedia page of the word that is selected. It may be through Safari or should I do this within the app with a webview?

我发现：

UIMenuController *menuController = [UIMenuController sharedMenuController];
UIMenuItem *item1 = [[UIMenuItem alloc] initWithTitle:@"Do This" action:@selector(item1)];
[menuController setMenuItems:[NSArray arrayWithObject:item1]];

但这似乎没有做任何事情。

But this didn't seem to do anything.

不幸的是我无法理解检索wikipedia页面的建议，我不是那么高级，对不起。我通常不知道在哪里放置代码片段。

Unfortunately I cannot understand the suggestions for retrieval of a wkipedia page, I am not that advanced, sorry. I usually do not know where to put the code snippets.

UILabel我已经更好地显示了文本，矩形UITextView中的文本顶部有一个间隙，因此文本不居中，偏移UITextview参数意味着文本固定在顶部，而不是在中央。将菜单附加到UILabel似乎非常困难。

The UILabel I have displays the text better, the text in the rectangular UITextView has a gap at the top so the text is not centred,offsetting the UITextview parameters means the text is anchored at the top, not centrally. Attaching menus to a UILabel seems very difficult.

推荐答案

MyViewController.h

MyViewController.h

@interface MyViewController : UIViewController

// Linked textField from interface builder
@property (weak, nonatomic) IBOutlet UITextField *textField;

@end

---

MyViewController.m

---

MyViewController.m

在 viewDidLoad 方法中，将wiki按钮添加到 UIMenuController 。

In viewDidLoad method, add wiki button to UIMenuController.

- (void)viewDidLoad
{
    [super viewDidLoad];

    // Add wiki button to UIMenuController
    UIMenuController *menuController = [UIMenuController sharedMenuController];
    UIMenuItem *wikiItem = [[UIMenuItem alloc] initWithTitle:@"Wiki" action:@selector(openWiki:)];
    [menuController setMenuItems:[NSArray arrayWithObject:wikiItem]];

}

创建 openWiki 方法：

- (void)openWiki:(id)sender {

    if(![[_textField selectedTextRange] isEmpty]) {

        // Url string
        NSString *urlStr = [NSString stringWithFormat:@"http://en.wikipedia.org/wiki/%@",[_textField textInRange:[_textField selectedTextRange]]];

        // Create url object
        NSURL *myURL = [[NSURL alloc] initWithString:urlStr];

        // Open url in safari
        [[UIApplication sharedApplication] openURL:myURL];

    }
}

就是这样。

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