请求允许访问Contacts iOS的权限

Question

我正在将所有原生地址簿联系人导入我的应用程序。目前，要求获得允许访问联系人的权限的提醒视图＆＃39;是在应用程序启动时完成的。

如何更改它以便在应用程序的其他位置询问权限？点击按钮就像Instagram一样？

看到这张图片：

Answer 1

您可以阅读文档HERE。

以下是一些可以帮助您入门的代码：

//First of all import the AddRessBookUI 
  #import <AddressBookUI/AddressBookUI.h>

  // Request to authorise the app to use addressbook
  ABAddressBookRef addressBookRef = ABAddressBookCreateWithOptions(nil, nil);

  if (ABAddressBookGetAuthorizationStatus() == kABAuthorizationStatusNotDetermined) {
    ABAddressBookRequestAccessWithCompletion(addressBookRef, ^(bool granted, CFErrorRef error) {
      if (granted) {
          // If the app is authorized to access the first time then add the contact
          [self _addContactToAddressBook];
      } else {
          // Show an alert here if user denies access telling that the contact cannot be added because you didn't allow it to access the contacts
      }
    });
  }
  else if (ABAddressBookGetAuthorizationStatus() == kABAuthorizationStatusAuthorized) {
    // If the user user has earlier provided the access, then add the contact
    [self _addContactToAddressBook];
  }
  else {
    // If the user user has NOT earlier provided the access, create an alert to tell the user to go to Settings app and allow access
  }

以下是您可能希望看到的另外两个教程，您可以找到HERE和HERE。

希望这有帮助！

更新：您必须使用didFinishLaunchingWithOptions检测您的应用首次启动：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    if ([[NSUserDefaults standardUserDefaults] boolForKey:@"HasLaunchedOnce"])
    {
        // The app has already launched once
    }
    else
    {
        [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"HasLaunchedOnce"];
        [[NSUserDefaults standardUserDefaults] synchronize];
        // This is the first time the app is launched
    }
}

Answer 2

应用程序在您尝试检索联系人时请求权限。

只需在按钮触摸后调用检索，而不是在启动后调用。