实用知识：<AddressBookUI/AddressBookUI.h>（获取手机通讯录）

#import "ViewController.h"// 提供联系人查询, 添加的UI界面#import <AddressBookUI/AddressBookUI.h>@interface ViewController () <UINavigationControllerDelegate, ABPeoplePickerNavigationControllerDelegate>// 联系人查询控制器@property (strong, nonatomic) ABPeoplePickerNavigationController *peoplePicker;@end@implementation ViewController- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{    // 1. 创建    self.peoplePicker = [[ABPeoplePickerNavigationController alloc] init];    // 2. 配置//    self.peoplePicker.delegate = self;    // 注意: 代理属性是peoplePickerDelegate, delegate属性是从UINavigationController继承过来的    self.peoplePicker.peoplePickerDelegate = self;    // 3. 弹出    [self presentViewController:self.peoplePicker animated:YES completion:nil];}#pragma mark - ABPeoplePickerNavigationControllerDelegate// 点击了右上解的取消按钮时触发- (void)peoplePickerNavigationControllerDidCancel:(ABPeoplePickerNavigationController *)peoplePicker{    NSLog(@"取消");}// 选中了某个联系人时触发- (void)peoplePickerNavigationController:(ABPeoplePickerNavigationController *)peoplePicker didSelectPerson:(ABRecordRef)person{    // 如果实现了该代理方法, 那么不会进入联系人详情界面    NSLog(@"选中了联系人");    /*================= 获取联系人的姓名 =================*/    // ABRecordRef : 表示通讯录数据库当中的一条记录    // C 语言的方法通过以自己为方法名开头, 通常第一个参数都Ref是填自己    // person 实际上是 ABPerson, Property ID 定义在 ABPerson 里面    // 凡是create, retain, copy, 都需要手动的去Release    // CFTypeRef 是通用类型, 类似于 id    CFStringRef firstname = ABRecordCopyValue(person, kABPersonFirstNameProperty);  // 名    CFStringRef lastname = ABRecordCopyValue(person, kABPersonLastNameProperty);   // 姓    /*================= CoreFoundation 与 Foundation 之间的转换 =================*/    // 方式1: 直接转换, 不转移对象所有权 (负责retainCount引用计数)//    NSString *firstNameString = (__bridge NSString *)(f\irstname);//    NSLog(@"%@", firstNameString);//    //    CFRelease(firstname);    // 方式2: 将非OC转换成OC, 转移对象所有权 (ARC)//    NSString *firstNameString = CFBridgingRelease(firstname);    // 两者等价    NSString *firstNameString = (__bridge_transfer NSString *)firstname;    NSString *lastNameString = CFBridgingRelease(lastname);    NSLog(@"%@ : %@", firstNameString,  lastNameString);    /*================= 获取联系人电话 =================*/    // kABPersonPhoneProperty 得到的是 ABMultiValueRef 的值    // ABMultiValueRef 可以理解成是一个包装 字典(Label - Value) 的 数组(多个电话)    ABMultiValueRef multiValue = ABRecordCopyValue(person, kABPersonPhoneProperty);    // 获取MultiValue的值的个数    CFIndex index = ABMultiValueGetCount(multiValue);    for (CFIndex i = 0; i < index; i++) {        // 获取每一个索引对应的label与value        CFStringRef label = ABMultiValueCopyLabelAtIndex(multiValue, i);        // 电话号码也是 CFStringRef        CFStringRef value = ABMultiValueCopyValueAtIndex(multiValue, i);        NSLog(@"%@ : %@", CFBridgingRelease(label), CFBridgingRelease(value));    }    CFRelease(multiValue);}@end