在早些时候,当iOS 6还没出来,我们访问通讯录只要如下简单的代码:
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ABAddressBookRef addressBook = ABAddressBookCreate();
不过在iOS 6上,这个API返回空值。苹果提供了如下API:
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// Call ABAddressBookCreateWithOptions to create an instance of AddressBook. The
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// ABAddressBookRef will initially not have access to contact data. The app must
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// then call ABAddressBookRequestAccessWithCompletion to request this access.
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// The options argument is reserved for future use. Currently it will always be NULL.
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// If access to contact data is already restricted or denied, this will fail returning
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// a NULL ABAddressBookRef with error kABOperationNotPermittedByUserError.
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AB_EXTERN ABAddressBookRef ABAddressBookCreateWithOptions(CFDictionaryRef options, CFErrorRef* error) __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_6_0);
由于之前的iOS
版本在隐私方面被人诟病,以至于出现App在没有提醒用户的情况访问通讯录而被拒绝的案例。现在每个App要访问通讯录都应该得到用户的授权:
因此,如上注释所描述的,我们应该调用如下API来获取授权:
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// Users are able to grant or deny access to contact data on a per-app basis. To request
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// access to contact data, call ABAddressBookRequestAccessWithCompletion. This will not
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// block the app while the user is being asked to grant or deny access. Until access has
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// been granted, a non-NULL ABAddressBookRef will not contain any contacts and any attempt to
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// modify contacts will fail with CFErrorRef returning kABOperationNotPermittedByUserError.
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// The user will only be prompted the first time access is requested; any subsequent calls
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// to ABAddressBookCreateWithOptions will use the existing permissions. The completion
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// handler is called on an arbitrary queue. If the ABAddressBookRef is used throughout the app,
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// then all usage should be dispatched to the same queue to use ABAddressBookRef in a
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// thread-safe manner.
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typedef void(^ABAddressBookRequestAccessCompletionHandler)(bool granted, CFErrorRef error);
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AB_EXTERN void ABAddressBookRequestAccessWithCompletion(ABAddressBookRef addressBook, ABAddressBookRequestAccessCompletionHandler completion) __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_6_0);
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ABAddressBookRef addressBook = NULL;
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__block BOOL accessGranted = NO;
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if (ABAddressBookRequestAccessWithCompletion != NULL) { // we're on iOS 6
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addressBook = ABAddressBookCreateWithOptions(NULL, NULL);
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dispatch_semaphore_t sema = dispatch_semaphore_create(0);
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ABAddressBookRequestAccessWithCompletion(addressBook, ^(bool granted, CFErrorRef error) {
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accessGranted = granted;
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dispatch_semaphore_signal(sema);
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});
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dispatch_semaphore_wait(sema, DISPATCH_TIME_FOREVER);
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dispatch_release(sema);
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}
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else { // we're on iOS 5 or older
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accessGranted = YES;
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}
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if (accessGranted) {
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// Do whatever you want here.
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}
不过这只会在第一次请求授权时才显示对话框,如果用户已经拒绝了,我们可以判断下授权状态:
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// To check the app's access to contact data. Based upon the access, the app could
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// display or hide its UI elements that would access any AddressBook API.
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//
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// kABAuthorizationStatusNotDetermined
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// The user has not yet made a choice regarding whether this app can access the data class.
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//
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// kABAuthorizationStatusRestricted
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// This application is not authorized to access the data class. The user cannot change
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// this application’s status, possibly due to active restrictions such as parental controls
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// being in place.
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//
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// kABAuthorizationStatusDenied
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// The user explicitly denied access to the data class for this application.
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//
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// kABAuthorizationStatusAuthorized
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// This application is authorized to access the data class.
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//
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typedef CF_ENUM(CFIndex, ABAuthorizationStatus) {
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kABAuthorizationStatusNotDetermined = 0,
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kABAuthorizationStatusRestricted,
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kABAuthorizationStatusDenied,
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kABAuthorizationStatusAuthorized
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};
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AB_EXTERN ABAuthorizationStatus ABAddressBookGetAuthorizationStatus(void) __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_6_0);
通过判断授权状态,我们可以再次提醒用户进行授权。
比较糟糕的是,在中文版上,访问通讯录会出现汉化错误,XXX 想访问您的日历:
从上图中可以看到,微信还给了用户更为详细的信息,表示现在是要访问通讯录,而非日历。
于是,我在上面提到的代码中翻了几遍,都没找到设置alertView详细信息的地方,最后在SO上得到解答
—— 通过在plist设置NSContactsUsageDescription关键字。详细文档见此。
调试经验分享:一般程序安装后,第一次会提示是否访问XXXX,再到二次的时候不管怎么它都不会提示,这样就不方便大家的调试了!
在设备里面还原后,它就会再次出现!
还原步棸:
设置--》通用--》还原--》还原位置与隐私
ok就可以了!
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