作者:Mitchell 

• 先引入一段示例代碼：

 - (void)viewDidLoad {
    [super viewDidLoad];
    //獲取通訊錄對象
    ABAddressBookRef addressBook = ABAddressBookCreateWithOptions(NULL, NULL);
    //獲取通訊錄對象匯總所有的聯(lián)系人
    CFArrayRef peopleArray = ABAddressBookCopyArrayOfAllPeople(addressBook);
    //遍歷數(shù)組
    CFIndex peopleCount = CFArrayGetCount(peopleArray);
    for (CFIndex i = 0; i<peopleCount; i++) {
        ABRecordRef person = CFArrayGetValueAtIndex(peopleArray, i);
        CFStringRef firstname = ABRecordCopyValue(person, kABPersonFirstNamePhoneticProperty);
        CFStringRef lastname = ABRecordCopyValue(person, kABPersonLastNamePhoneticProperty);
        NSString* firstName = (__bridge NSString*)firstname;
        NSString* lastName = (__bridge NSString*)lastname;        
        NSLog(@"%@%@",firstName,lastName);
        CFRelease(firstname);
        CFRelease(lastname);
    }
    CFRelease(peopleArray);
    CFRelease(addressBook);
}

• 在 iOS 中關(guān)于 CoreFoundation 框架和 Foundation 框架的橋接有三種方式。
  • 1、***CoreFoundation-> Foundation ***坪郭。
    將 CoreFoundation 框架的對象的對象所有權(quán)交給 Foundation 框架來使用淘钟，CoreFoundation 中的對象的內(nèi)存管理還是自己來管理

(__bridge <#type#>)<#expression#>);

- 2、*** Foundation-> CoreFoundation ***。

將 Foundation 框架的對象 retain 之后轉(zhuǎn)換為 CoreFoundation 框架來使用，這樣保證了 Foundation 框架的對象被釋放后，CoreFoundation 的值仍舊能正常使用：

(__bridge_retained <#CF type#>)<#expression#>;

- 3驻售、*** CoreFoundation-> Foundation ***。

將 CoreFoundation 框架中的對象的所有權(quán)和內(nèi)存都交給Foundation 框架來管理更米，也就是說通過這種方法來轉(zhuǎn)換之后欺栗，不用寫 CFRelease（） 了。

(__bridge_transfer <#Objective-C type#>)<#expression#>);

• 以示例代碼為例：

 - (void)viewDidLoad {
    [super viewDidLoad];
    //獲取通訊錄對象
    ABAddressBookRef addressBook = ABAddressBookCreateWithOptions(NULL, NULL);
    //獲取通訊錄對象匯總所有的聯(lián)系人
    CFArrayRef peopleArray = ABAddressBookCopyArrayOfAllPeople(addressBook);
    //遍歷數(shù)組
    CFIndex peopleCount = CFArrayGetCount(peopleArray);
    for (CFIndex i = 0; i<peopleCount; i++) {
        ABRecordRef person = CFArrayGetValueAtIndex(peopleArray, i);
        CFStringRef firstname = ABRecordCopyValue(person, kABPersonFirstNamePhoneticProperty);
        CFStringRef lastname = ABRecordCopyValue(person, kABPersonLastNamePhoneticProperty);
//修改firstName的轉(zhuǎn)換方式
        NSString* firstName = (__bridge_transfer NSString*)firstname;
        NSString* lastName = (__bridge NSString*)lastname;        
        NSLog(@"%@%@",firstName,lastName);
//就不用寫這句話了
//CFRelease(firstname);
        CFRelease(lastname);
    }
    CFRelease(peopleArray);
    CFRelease(addressBook);
}