blocks|key|882052|text|请看一下The+Application+Runtime+Environment上的文件保护部分。文件保护要求用户启用密码锁定设置并设置有效的密码。如果您的应用程序写入/创建文件，请使用NSDataWritingFileProtectionComplete选项。如果您的应用程序不使用任何文件，则创建一个虚拟文件并启用保护。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|882053|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.apple.com/library/ios/#documentation/iphone/conceptual/iphoneosprogrammingguide/RuntimeEnvironment/RuntimeEnvironment.html|1|http://developer.apple.com/library/ios/#documentation/Cocoa/Reference/Foundation/Classes/NSData_Class/Reference/Reference.html#//apple_ref/c/econst/NSDataWritingFileProtectionComplete^0|4|Z|0|2K|Z|1|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]|$A|R|B|S|1|T]]|C|$]]|$1|D|3|-4|5|6|7|U|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]|L|$5|G|H|I|C|$J|M]]]]

Take a look at the File Protection section on <a href="http://developer.apple.com/library/ios/#documentation/iphone/conceptual/iphoneosprogrammingguide/RuntimeEnvironment/RuntimeEnvironment.html" rel="nofollow">The Application Runtime Environment</a>. File protection requires the user to have passcode lock setting enabled and a valid passcode set. If you your application writes/creates and file, use the <a href="http://developer.apple.com/library/ios/#documentation/Cocoa/Reference/Foundation/Classes/NSData_Class/Reference/Reference.html#//apple_ref/c/econst/NSDataWritingFileProtectionComplete" rel="nofollow">NSDataWritingFileProtectionComplete</a> option. If your application doesn't use any files, then create a dummy file and enable the protection.

blocks|key|882102|text|Xamarin.iOS针对iOS+8...note的解决方案我在每次检查时都会调用SecKeyChain.Remove(secRecord)。我发现如果不包括这一点，我可能会让设备进入一种奇怪的状态，在这种状态下，它会尝试在每次调用SecKeyChain.Add(secRecord)时向用户进行身份验证|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|882103|private+bool+DetectIfPasscodeIsSet+()
{
++++var+secRecord+=+new+SecRecord+(SecKind.GenericPassword)+{
++++++++Label+=+"Check+if+passcode+is+set",
++++++++Description+=+"Check+if+passcode+is+set",
++++++++Account+=+"Check+if+passcode+is+set",
++++++++Service+=+"Check+if+passcode+is+set",
++++++++Comment+=+"Check+if+passcode+is+set",
++++++++ValueData+=+NSData.FromString+("Check+if+passcode+is+set"),
++++++++Generic+=+NSData.FromString+("Check+if+passcode+is+set")
++++};
++++SecKeyChain.Remove+(secRecord);+
++++secRecord.AccessControl+=+new+SecAccessControl+(SecAccessible.WhenPasscodeSetThisDeviceOnly);
++++var+status+=+SecKeyChain.Add+(secRecord);
++++if+(SecStatusCode.Success+==+status)+{
++++++++SecKeyChain.Remove+(secRecord);
++++++++return+true;
++++}
++++return+false;
}|code-block|syntax|javascript|882104|entityMap^0|15|T|38|Q|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

Xamarin.iOS solution for iOS 8...note I call <code>SecKeyChain.Remove(secRecord)</code> on every check. I found if I didn't include this I could get the device into an odd state where it was trying to authenticate with the user on every call to <code>SecKeyChain.Add(secRecord)</code>

<pre><code>private bool DetectIfPasscodeIsSet ()
{
 var secRecord = new SecRecord (SecKind.GenericPassword) {
 Label = "Check if passcode is set",
 Description = "Check if passcode is set",
 Account = "Check if passcode is set",
 Service = "Check if passcode is set",
 Comment = "Check if passcode is set",
 ValueData = NSData.FromString ("Check if passcode is set"),
 Generic = NSData.FromString ("Check if passcode is set")
 };
 SecKeyChain.Remove (secRecord); 
 secRecord.AccessControl = new SecAccessControl (SecAccessible.WhenPasscodeSetThisDeviceOnly);
 var status = SecKeyChain.Add (secRecord);
 if (SecStatusCode.Success == status) {
 SecKeyChain.Remove (secRecord);
 return true;
 }
 return false;
}
</code></pre>

blocks|key|882148|text|从iOS+9开始，LocalAuthentication框架中就有了一个标志LAPolicyDeviceOwnerAuthentication。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|882149|%2B+(BOOL)isPasscodeEnabled
{
++++NSError+*error+=+nil;
++++LAContext+*context+=+[[LAContext+alloc]+init];

++++BOOL+passcodeEnabled+=+[context+canEvaluatePolicy:LAPolicyDeviceOwnerAuthentication+error:&error];

++++if(passcodeEnabled)+{
++++++++NSLog(@"Passcode+enabled.");
++++++++return+YES;
++++}

++++NSLog(@"Passcode+NOT+enabled:+%25@",+error.localizedDescription);
++++return+NO;
}|code-block|syntax|javascript|882150|自iOS+8以来，出现了另一个用于检查是否启用了TouchID的标志：|882151|%2B+(BOOL)isTouchIdEnabled
{
++++NSError+*error+=+nil;
++++LAContext+*context+=+[[LAContext+alloc]+init];

++++BOOL+touchIDEnabled+=+[context+canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics+error:&error];

++++if(touchIDEnabled)+{
++++++++NSLog(@"TouchID+enabled.");
++++++++return+YES;
++++}

++++NSLog(@"TouchID+NOT+enabled:+%25@",+error.localizedDescription);
++++return+NO;
}|882152|entityMap^0|1|5|12|X|0|0|1|5|O|7|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|W|8|@$9|X|A|Y|B|C]|$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|M|3|N|5|H|7|11|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|P|$]]

Since <code>iOS 9</code>, there is a flag <code>LAPolicyDeviceOwnerAuthentication</code> in LocalAuthentication framework.

<pre><code>+ (BOOL)isPasscodeEnabled
{
 NSError *error = nil;
 LAContext *context = [[LAContext alloc] init];

 BOOL passcodeEnabled = [context canEvaluatePolicy:LAPolicyDeviceOwnerAuthentication error:&amp;error];

 if(passcodeEnabled) {
 NSLog(@"Passcode enabled.");
 return YES;
 }

 NSLog(@"Passcode NOT enabled: %@", error.localizedDescription);
 return NO;
}
</code></pre>

Since <code>iOS 8</code> there have been another flag for checking if <code>TouchID</code> is enabled:

<pre><code>+ (BOOL)isTouchIdEnabled
{
 NSError *error = nil;
 LAContext *context = [[LAContext alloc] init];

 BOOL touchIDEnabled = [context canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&amp;error];

 if(touchIDEnabled) {
 NSLog(@"TouchID enabled.");
 return YES;
 }

 NSLog(@"TouchID NOT enabled: %@", error.localizedDescription);
 return NO;
}
</code></pre>

Since my app would be dealing with sensitive data of the user, I would like to know if there is a way I can check from my app whether there is a Passcode Lock set in iOS.

The reason I need to check this is because say if the user has in the app some information and then keeps it on the table and goes out for a couple of minutes. The iPad/iPhone by default, goes to standby mode. If a passcode lock had been set, only when the correct passcode is entered, would anyone be able to use the ipad. This would provide an additional security measure to prevent any passerby to view the sensitive data from the app.

So basically, I would like my app to check whether the passcode lock is set and if not prompt the user to do it.

Is this possible?

Programmatically Checking if a Passcode Lock is Set

由于我的应用程序将处理用户的敏感数据，我想知道是否有一种方法可以从我的应用程序中检查是否在iOS中设置了密码锁。我需要检查的原因是，假设用户在应用程序中有一些信息，然后将其放在桌子上，然后出去几分钟。默认情况下，iPad/iPhone会进入待机模式。如果设置了密码锁，只有输入正确的密码，任何人都可以使用ipad。这将提...

问以编程方式检查是否设置了密码锁
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