blocks|key|4611630|text|看起来你遇到了一个编译器错误，你应该报告。您可以采用不同的路径来检索值，如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4611631|++++var+dataTypeRef+:Unmanaged<AnyObject>?
++++let+status+=+SecItemCopyMatching(queryAttributes,+&dataTypeRef);

++++let+opaque+=+dataTypeRef?.toOpaque()

++++if+let+op+=+opaque?+{
++++++++let+retrievedData+=+Unmanaged<NSData>.fromOpaque(op).takeUnretainedValue()

++++}|code-block|syntax|javascript|4611632|当使用AnyObject作为Unmanaged<T>的类型参数T时，该错误会显现出来。下面的代码片段可以顺利编译，它使用了更具体的类型CFError|offset|length|style|CODE|4611633|++++let+url+=+NSURL(string:"dummy")
++++var+errorRef:+Unmanaged<CFError>?
++++let+succeeded+=+CTFontManagerRegisterFontsForURL(url,+.Process,+&errorRef)

++++if+errorRef+{
++++++++let+error+=+errorRef!.takeRetainedValue()
++++}|4611634|由于Keychain+API根据查询属性返回不同的结果，因此需要使用AnyObject。|4611635|entityMap^0|0|0|3|9|E|C|V|1|1V|7|0|0|Y|9|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@$I|V|J|W|K|L]|$I|X|J|Y|K|L]|$I|Z|J|10|K|L]|$I|11|J|12|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|13|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|14|8|@$I|15|J|16|K|L]]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|R|$]]

Looks like you have hit a compiler bug, which you should report. You can take a different path to retrieving the value, such as the following:

<pre><code> var dataTypeRef :Unmanaged&lt;AnyObject&gt;?
 let status = SecItemCopyMatching(queryAttributes, &amp;dataTypeRef);

 let opaque = dataTypeRef?.toOpaque()

 if let op = opaque? {
 let retrievedData = Unmanaged&lt;NSData&gt;.fromOpaque(op).takeUnretainedValue()

 }
</code></pre>

The error manifests itself when using <code>AnyObject</code> as a type parameter <code>T</code> of <code>Unmanaged&lt;T&gt;</code>. The following code snippet compiles without issue, which uses a more specific type, <code>CFError</code>:

<pre><code> let url = NSURL(string:"dummy")
 var errorRef: Unmanaged&lt;CFError&gt;?
 let succeeded = CTFontManagerRegisterFontsForURL(url, .Process, &amp;errorRef)

 if errorRef {
 let error = errorRef!.takeRetainedValue()
 }
</code></pre>

As the Keychain API returns a different result depending of the query attributes, the use of <code>AnyObject</code> is required.

blocks|key|105098|text|要使其正常工作，您需要首先访问每个keychain常量的保留值。例如：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|105099|let+kSecClassValue+=+kSecClass.takeRetainedValue()+as+NSString
let+kSecAttrAccountValue+=+kSecAttrAccount.takeRetainedValue()+as+NSString
let+kSecValueDataValue+=+kSecValueData.takeRetainedValue()+as+NSString
let+kSecClassGenericPasswordValue+=+kSecClassGenericPassword.takeRetainedValue()+as+NSString
let+kSecAttrServiceValue+=+kSecAttrService.takeRetainedValue()+as+NSString
let+kSecMatchLimitValue+=+kSecMatchLimit.takeRetainedValue()+as+NSString
let+kSecReturnDataValue+=+kSecReturnData.takeRetainedValue()+as+NSString
let+kSecMatchLimitOneValue+=+kSecMatchLimitOne.takeRetainedValue()+as+NSString+|code-block|syntax|javascript|105100|然后需要引用在密钥链字典对象中创建的常量，如下所示。|105101|var+keychainQuery:+NSMutableDictionary+=+NSMutableDictionary(objects:+[kSecClassGenericPasswordValue,+service,+userAccount,+kCFBooleanTrue,+kSecMatchLimitOneValue],+forKeys:+[kSecClassValue,+kSecAttrServiceValue,+kSecAttrAccountValue,+kSecReturnDataValue,+kSecMatchLimitValue])|105102|我写了一篇关于它的博客文章：http://rshelby.com/2014/08/using-swift-to-save-and-query-ios-keychain-in-xcode-beta-4/|offset|length|105103|希望这能有所帮助！|105104|rshelby|105105|entityMap|0|LINK|mutability|MUTABLE|url|http://rshelby.com/2014/08/using-swift-to-save-and-query-ios-keychain-in-xcode-beta-4/^0|0|0|0|0|E|2E|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|12|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|13|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|14|8|@]|9|@$M|15|N|16|1|17]]|A|$]]|$1|O|3|P|5|6|7|18|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|19|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|Z]]]]

To get this to work you need to access the retained value for each keychain constant first. For example:

<pre><code>let kSecClassValue = kSecClass.takeRetainedValue() as NSString
let kSecAttrAccountValue = kSecAttrAccount.takeRetainedValue() as NSString
let kSecValueDataValue = kSecValueData.takeRetainedValue() as NSString
let kSecClassGenericPasswordValue = kSecClassGenericPassword.takeRetainedValue() as NSString
let kSecAttrServiceValue = kSecAttrService.takeRetainedValue() as NSString
let kSecMatchLimitValue = kSecMatchLimit.takeRetainedValue() as NSString
let kSecReturnDataValue = kSecReturnData.takeRetainedValue() as NSString
let kSecMatchLimitOneValue = kSecMatchLimitOne.takeRetainedValue() as NSString 
</code></pre>

You'll then need to reference the constant you created in the keychain dictionary object like so.

<pre><code>var keychainQuery: NSMutableDictionary = NSMutableDictionary(objects: [kSecClassGenericPasswordValue, service, userAccount, kCFBooleanTrue, kSecMatchLimitOneValue], forKeys: [kSecClassValue, kSecAttrServiceValue, kSecAttrAccountValue, kSecReturnDataValue, kSecMatchLimitValue])
</code></pre>

I wrote a blog post about it at: <a href="http://rshelby.com/2014/08/using-swift-to-save-and-query-ios-keychain-in-xcode-beta-4/" rel="nofollow">http://rshelby.com/2014/08/using-swift-to-save-and-query-ios-keychain-in-xcode-beta-4/</a>

Hope this helps!

rshelby

blocks|key|105122|text|使用withUnsafeMutablePointer函数和UnsafeMutablePointer结构检索数据，如下所示：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|105123|var+result:+AnyObject?
var+status+=+withUnsafeMutablePointer(&result)+{+SecItemCopyMatching(queryAttributes,+UnsafeMutablePointer($0))+}

if+status+==+errSecSuccess+{
++++if+let+data+=+result+as+NSData?+{
++++++++if+let+string+=+NSString(data:+data,+encoding:+NSUTF8StringEncoding)+{
++++++++++++//+...
++++++++}
++++}
}|code-block|syntax|javascript|105124|它在发布(最快的-O)版本中工作得很好。|105125|entityMap^0|2|O|T|K|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|N|$]]

Use <code>withUnsafeMutablePointer</code> function and <code>UnsafeMutablePointer</code> struct to retrieving the data, such as the following:

<pre><code>var result: AnyObject?
var status = withUnsafeMutablePointer(&amp;result) { SecItemCopyMatching(queryAttributes, UnsafeMutablePointer($0)) }

if status == errSecSuccess {
 if let data = result as NSData? {
 if let string = NSString(data: data, encoding: NSUTF8StringEncoding) {
 // ...
 }
 }
}
</code></pre>

it works fine with release (Fastest [-O]) build.

I'm stuck converting the Keychain query result using Swift.

My request seems to be working:

<pre><code>let queryAttributes = NSDictionary(objects: [kSecClassGenericPassword, "MyService", "MyAccount", true],
 forKeys: [kSecClass, kSecAttrService, kSecAttrAccount, kSecReturnData])


dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), {
 var dataTypeRef : Unmanaged&lt;AnyObject&gt;?
 let status = SecItemCopyMatching(queryAttributes, &amp;dataTypeRef);

 let retrievedData : NSData = dataTypeRef!.takeRetainedValue() as NSData
 *** ^^^^can't compile this line^^^^
})
</code></pre>

My problem is, code won't compile:

<pre><code>Bitcast requires both operands to be pointer or neither
 %114 = bitcast %objc_object* %113 to %PSs9AnyObject_, !dbg !487
Bitcast requires both operands to be pointer or neither
 %115 = bitcast %PSs9AnyObject_ %114 to i8*, !dbg !487
LLVM ERROR: Broken function found, compilation aborted!
</code></pre>

I don't know how to convert <code>Unmanaged&lt;AnyObject&gt;</code> to <code>NSData</code>.

Any ideas?

Querying iOS Keychain using Swift

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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我遇到了使用Swift转换Keychain查询结果的问题。我的请求似乎起作用了：let queryAttributes = NSDictionary(objects: [kSecClassGenericPassword, "MyService",     "MyAccount",       true],       ...

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