AddressBookUI Framework in iOS9 beta4

在以前的iOS版本中，当我们需要读取系统的通讯录时，我们只需要简单调用AddressBookUI framework中的ABPeoplePickerNavigationController，代码如下：

ABPeoplePickerNavigationController *abNavCtrl = [[ABPeoplePickerNavigationController alloc] init];                abNavCtrl.peoplePickerDelegate = self;                abNavCtrl.predicateForSelectionOfPerson = [NSPredicate predicateWithValue:FALSE];                [self presentViewController:abNavCtrl animated:YES completion:nil];

然后实现ABPeoplePickerNavigationController的代理就行了。（在iOS8之后，需要用新的代理方法）

但是在iOS9 beta4 (写这篇文章时，最新的iOSbeta版本)，打开Contacts后，选择某个phone number，App会直接黑屏或者白屏，整个应用会挂起。ABPeoplePickerNavigationController的代理方法也不能执行到 （除了Cancel的代理方法外）。

（另外，如果没记错，在iOS9 beta4中，打开Contacts时，没有授权提示框出现。）

不确定这是不是iOS9 beta4的bug，测试过Xcode7 beta2/beta3的模拟器都能正常运行。

所以我找到了另外一种方法来解决这个问题，先判断AddressBook的状态，拿到授权再打开Contacts页面。代码如下：

ABAuthorizationStatus status = ABAddressBookGetAuthorizationStatus();        if (status == kABAuthorizationStatusNotDetermined) {                ABAddressBookRef abRef = ABAddressBookCreateWithOptions(nil, nil);                ABAddressBookRequestAccessWithCompletion(abRef, ^(bool granted, CFErrorRef error) {                        if (nil == error && granted) {                                ABPeoplePickerNavigationController *abNavCtrl = [[ABPeoplePickerNavigationController alloc] init];                                abNavCtrl.peoplePickerDelegate = self;                                abNavCtrl.predicateForSelectionOfPerson = [NSPredicate predicateWithValue:FALSE];                                [self presentViewController:abNavCtrl animated:YES completion:nil];                            }            else {                            }        });    }    else if (status == kABAuthorizationStatusRestricted) {                // Show the error prompt pls    }    else if (status == kABAuthorizationStatusDenied) {                // Show the error prompt pls    }    else if (status == kABAuthorizationStatusAuthorized) {                ABPeoplePickerNavigationController *abNavCtrl = [[ABPeoplePickerNavigationController alloc] init];                abNavCtrl.peoplePickerDelegate = self;                abNavCtrl.predicateForSelectionOfPerson = [NSPredicate predicateWithValue:FALSE];                [self presentViewController:abNavCtrl animated:YES completion:nil];            }

在iOS7，8中都能正常运行。感觉这个才应该是正确的调用AddressBookUI的流程。