如何在设置页面打开 TouchID 页面？

Question

我是 Objective-C 的新手。我想在 iPhone 设置页面中打开 TouchID 页面，但我的代码只是在在线公共源中打开设置页面。我写了下面的代码。

======打开iPhone设置页面=======

if (&UIApplicationOpenSettingsURLString != NULL)
    {
        NSURL *url = [NSURL URLWithString:UIApplicationOpenSettingsURLString];
        [[UIApplication sharedApplication] openURL:url];
        NSLog(@"&UIApplicationOpenSettingsURLString != NULL");
    }
    else
    {
        // Present some dialog telling the user to open the settings app.
        NSLog(@"&UIApplicationOpenSettingsURLString == NULL");
    }

如何修改代码来解决这个问题？

Answer 1

编辑：

此解决方案不再适用于 iOS 11+

---

在 iOS 10 之前你不能这样做。

话虽如此，您必须“找出”网址是什么。

你可以试试这个代码：

// URL to open general settings in case the TouchID one was not found.
NSString * defaultSettingsStr = ( &UIApplicationOpenSettingsURLString != NULL ? UIApplicationOpenSettingsURLString : @"prefs:root" );

// Array of possible URLs, differ in various iOS versions
NSArray * urlStrs = @[@"App-Prefs:root=TOUCHID_PASSCODE",
                 @"Prefs:root=TOUCHID_PASSCODE",
                 defaultSettingsStr];

for (NSString * urlStr in urlStrs) {
   NSURL * url = [NSURL URLWithString:urlStr];

   if ([[UIApplication sharedApplication] canOpenURL:url]) {
       // openURL is deprecated since iOS 10
       [[UIApplication sharedApplication] openURL:url];
       break;
   }
}