blocks|key|903322|text|我认为这不可能直接实现，但如果应用程序注册了uri方案，您可以对其进行测试。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|903323|URI方案例如是facebook应用程序的fb://。你可以在你的应用程序的info.plist中注册。[UIApplication+canOpenURL:url]会告诉你某个网址会不会打开。因此，测试fb://是否会打开，将表明安装了一个注册了fb://的应用程序--这对facebook应用程序是一个很好的提示。|offset|length|style|CODE|903324|//+check+whether+facebook+is+(likely+to+be)+installed+or+not
if+([[UIApplication+sharedApplication]+canOpenURL:[NSURL+URLWithString:@"fb://"]])+{
++++//+Safe+to+launch+the+facebook+app
++++[[UIApplication+sharedApplication]+openURL:[NSURL+URLWithString:@"fb://profile/200538917420"]];
}|code-block|syntax|javascript|903325|entityMap^0|0|L|5|1G|U|2T|5|3F|5|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@$D|Q|E|R|F|G]|$D|S|E|T|F|G]|$D|U|E|V|F|G]|$D|W|E|X|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|Y|8|@]|9|@]|A|$K|L]]|$1|M|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|N|$]]

I think this is not possible directly, but if the apps register uri schemes you could test for that.

A URI scheme is for example <code>fb://</code> for the facebook app. You can register that in the info.plist of your app. <code>[UIApplication canOpenURL:url]</code> will tell you if a certain url will or will not open. So testing if <code>fb://</code> will open, will indicate that there is an app installed which registered <code>fb://</code> - which is a good hint for the facebook app.

<pre><code>// check whether facebook is (likely to be) installed or not
if ([[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"fb://"]]) {
 // Safe to launch the facebook app
 [[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"fb://profile/200538917420"]];
}
</code></pre>

blocks|key|1652249|text|下面是一个用于测试是否安装了facebook应用程序的示例|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1652250|if+([[UIApplication+sharedApplication]+canOpenURL:[NSURL+URLWithString:@"fb://"]])+{
++++//+Facebook+app+is+installed
}|code-block|syntax|javascript|1652251|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Here's an example to test if the facebook app is installed

<pre><code>if ([[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"fb://"]]) {
 // Facebook app is installed
}
</code></pre>

blocks|key|2773700|text|对于任何试图用iOS+9/Swift+2做到这一点的人来说：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2773701|首先，您需要将以下内容添加到您的Info.plist文件(一个安全特性--请参阅Leo+Natan's+answer)，从而将该地址列入“白名单”：|offset|length|style|CODE|2773702|<key>LSApplicationQueriesSchemes</key>
<array>
++++<string>fb</string>
</array>|code-block|syntax|javascript|2773703|在此之后，您可以询问应用程序是否可用，以及是否有注册方案：|2773704|guard+UIApplication.sharedApplication().canOpenURL(NSURL(string:+"fb://")!)+else+{
++++NSLog("No+Facebook?++You're+a+better+man+than+I+am,+Charlie+Brown.")
++++return
}|2773705|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/30987986/ios-9-not-opening-instagram-app-with-url-scheme^0|0|G|A|14|I|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@$D|10|E|11|F|G]]|9|@$D|12|E|13|1|14]]|A|$]]|$1|H|3|I|5|J|7|15|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|16|8|@]|9|@]|A|$]]|$1|O|3|P|5|J|7|17|8|@]|9|@]|A|$K|L]]|$1|Q|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]]]

For anyone trying to do this with iOS 9/Swift 2:

First, you'll need to 'whitelist' the URL by adding the following to your <code>Info.plist</code> file (a security feature--see <a href="https://stackoverflow.com/questions/30987986/ios-9-not-opening-instagram-app-with-url-scheme">Leo Natan's answer</a>):

<pre class="lang-xml prettyprint-override"><code>&lt;key&gt;LSApplicationQueriesSchemes&lt;/key&gt;
&lt;array&gt;
 &lt;string&gt;fb&lt;/string&gt;
&lt;/array&gt;
</code></pre>

After that, you can ask whether the app is available and has a registered scheme:

<pre class="lang-swift prettyprint-override"><code>guard UIApplication.sharedApplication().canOpenURL(NSURL(string: "fb://")!) else {
 NSLog("No Facebook? You're a better man than I am, Charlie Brown.")
 return
}
</code></pre>

blocks|key|1652303|text|当涉及到社交网络时，最好检查多个方案。(例如，因为方案'fb‘对于IOS9+SDK是过时的。)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1652304|NSArray*+fbSchemes+=+@[
+++++@"fbapi://",+@"fb-messenger-api://",+@"fbauth2://",+@"fbshareextension://"];
BOOL+isInstalled+=+false;

for+(NSString*+fbScheme+in+fbSchemes)+{
++++isInstalled+=+[[UIApplication+sharedApplication]+canOpenURL:[NSURL+URLWithString:fbScheme]];
++++if(isInstalled)+break;
}

if+(!isInstalled)+{
++++//+code
++++return;
}|code-block|syntax|javascript|1652305|当然，Info.plist还应该包含所有必要的方案：|1652306|<key>LSApplicationQueriesSchemes</key>
<array>
++++<string>fbapi</string>
++++<string>fb-messenger-api</string>
++++<string>fbauth2</string>
++++<string>fbshareextension</string>
</array>|1652307|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

When it comes to social networks, it is best to check multiple schemes. (Because scheme 'fb' is obsolete for IOS9 SDK for example.):

<pre><code>NSArray* fbSchemes = @[
 @"fbapi://", @"fb-messenger-api://", @"fbauth2://", @"fbshareextension://"];
BOOL isInstalled = false;

for (NSString* fbScheme in fbSchemes) {
 isInstalled = [[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:fbScheme]];
 if(isInstalled) break;
}

if (!isInstalled) {
 // code
 return;
}
</code></pre>

Of course Info.plist also should contain all necessary schemes: 

<pre><code>&lt;key&gt;LSApplicationQueriesSchemes&lt;/key&gt;
&lt;array&gt;
 &lt;string&gt;fbapi&lt;/string&gt;
 &lt;string&gt;fb-messenger-api&lt;/string&gt;
 &lt;string&gt;fbauth2&lt;/string&gt;
 &lt;string&gt;fbshareextension&lt;/string&gt;
&lt;/array&gt;
</code></pre>

blocks|key|4182203|text|Swift+3.1、Swift+3.2、Swift+4|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|4182204|if+let+urlFromStr+=+URL(string:+"fb://")+{
++++if+UIApplication.shared.canOpenURL(urlFromStr)+{
++++++++if+#available(iOS+10.0,+*)+{
++++++++++++UIApplication.shared.open(urlFromStr,+options:+[:],+completionHandler:+nil)
++++++++}+else+{
++++++++++++UIApplication.shared.openURL(urlFromStr)
++++++++}
++++}
}|code-block|syntax|javascript|4182205|在Info.plist中添加以下内容：|4182206|<key>LSApplicationQueriesSchemes</key>
<array>
++++<string>fb</string>
</array>|4182207|entityMap^0|0|R|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|P|$]]

Swift 3.1, Swift 3.2, Swift 4

<pre><code>if let urlFromStr = URL(string: "fb://") {
 if UIApplication.shared.canOpenURL(urlFromStr) {
 if #available(iOS 10.0, *) {
 UIApplication.shared.open(urlFromStr, options: [:], completionHandler: nil)
 } else {
 UIApplication.shared.openURL(urlFromStr)
 }
 }
}
</code></pre>

Add these in Info.plist :

<pre><code>&lt;key&gt;LSApplicationQueriesSchemes&lt;/key&gt;
&lt;array&gt;
 &lt;string&gt;fb&lt;/string&gt;
&lt;/array&gt;
</code></pre>

blocks|key|1652354|text|iOS+9及更新版本：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|1652355|由于苹果从iOS+9开始做了一些安全更改，除了其他答案中提到的canOpenURL之外，您还需要在info.plist中添加一个带有字符串的LSApplicationQueriesSchemes数组。查看使用Twitter的示例的屏幕截图。|1652356|​|1652357|📷|atomic|1652358|1652359|如果您想添加Facebook，只需在数组中添加另一个字符串值为"fb“的项。|1652360|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/d0601ff82a0b354ee5e15950e9fd41b4.png|imageAlt^0|0|B|0|0|0|0|1|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|11|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|12|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|13|8|@]|D|@$9|14|A|15|1|16]]|E|$]]|$1|M|3|I|5|6|7|17|8|@]|D|@]|E|$]]|$1|N|3|O|5|6|7|18|8|@]|D|@]|E|$]]|$1|P|3|-4|5|6|7|19|8|@]|D|@]|E|$]]]|Q|$R|$5|S|T|U|E|$V|W|X|-4]]]]

iOS 9 and newer update:

Because of some security changes Apple made starting in iOS 9, in addition to canOpenURL mentioned in other answers, you also need to add an LSApplicationQueriesSchemes array with strings in info.plist. See screenshot for an example using Twitter.

<a href="https://i.stack.imgur.com/ontzg.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ontzg.png" alt="info.plist LSApplicationQueriesSchemes array"></a>

If you wanted to add Facebook, you would just add another item in the array with a string value of "fb".

I am developing an iPhone application which will install few third party applications in an enterprise. I have the information about the bundle IDs. Is there a way to check if the application is already installed, using some system APIs? Currently the application gets installed again, overwriting the current installation. I need to prevent this some how. (Apple's AppStore application disables the installation option if the app is already installed.)

How to check programmatically if an App is installed?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在开发一个iPhone应用程序，它将在企业中安装几个第三方应用程序。我有关于捆绑包ID的信息。有没有办法使用一些系统API检查应用程序是否已经安装？当前，应用程序将再次安装，覆盖当前安装。我需要用一些方法来防止这种情况。(苹果的AppStore应用程序会禁用安装选项，如果该应用程序已经安装。)

问如何以编程方式检查是否安装了应用程序？
EN

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问如何以编程方式检查是否安装了应用程序？EN