获取手机通讯录联系人 CNContacts

（摘自）http://www.jianshu.com/p/df0ea100c3da

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    // 1.获取授权状态
    CNAuthorizationStatus status = [CNContactStore authorizationStatusForEntityType:CNEntityTypeContacts];

    // 2.判断授权状态,如果不是已经授权,则直接返回
    if (status != CNAuthorizationStatusAuthorized) return;

    // 3.创建通信录对象
    CNContactStore *contactStore = [[CNContactStore alloc] init];

    // 4.创建获取通信录的请求对象
    // 4.1.拿到所有打算获取的属性对应的key
    NSArray *keys = @[CNContactGivenNameKey, CNContactFamilyNameKey, CNContactPhoneNumbersKey];

    // 4.2.创建CNContactFetchRequest对象
    CNContactFetchRequest *request = [[CNContactFetchRequest alloc] initWithKeysToFetch:keys];

    // 5.遍历所有的联系人
    [contactStore enumerateContactsWithFetchRequest:request error:nil usingBlock:^(CNContact * _Nonnull contact, BOOL * _Nonnull stop) {
        // 1.获取联系人的姓名
        NSString *lastname = contact.familyName;
        NSString *firstname = contact.givenName;
        NSLog(@"%@ %@", lastname, firstname);

        // 2.获取联系人的电话号码
        NSArray *phoneNums = contact.phoneNumbers;
        for (CNLabeledValue *labeledValue in phoneNums) {
            // 2.1.获取电话号码的KEY
            NSString *phoneLabel = labeledValue.label;

            // 2.2.获取电话号码
            CNPhoneNumber *phoneNumer = labeledValue.value;
            NSString *phoneValue = phoneNumer.stringValue;

            NSLog(@"%@ %@", phoneLabel, phoneValue);
        }
    }];
}