iOS 修改通讯录联系人地址（address）崩溃原因分析

目前项目中需要对iOS系统通讯录进行读取，修改操作。在进行对地址修改的时候，出现了一个奇怪现象：

● 如果contact没有address字段（或者一个全新的contact），对它的address进行修改是可以成功的，

● 如果这个人有过address字段，此时对它就行修改就崩溃。控制台打出：

*** -[CFString release]: message sent to deallocated instance 0x81d26f0

这应该是一个僵尸对象，重复释放某一个对象。首先我对修改通讯录的代码进行检查，但是没发现问题，下面是代码 

   //设置地址
    ABMutableMultiValueRef multiAddress = ABMultiValueCreateMutable(kABMultiDictionaryPropertyType);
    for (PhoneTypePair* p in contact.addressArr) {
        //内容判断空
        if ([p.content length]==0) {
            continue;
        }
        NSMutableDictionary *addressDictionary = [[NSMutableDictionary alloc] init];
        //把地址只写入street字段中
        [addressDictionary setObject:[p.content mutableCopy] forKey:(NSString *)kABPersonAddressStreetKey];
        [addressDictionary setObject:@"" forKey:(NSString *)kABPersonAddressCityKey];
        [addressDictionary setObject:@"" forKey:(NSString *)kABPersonAddressStateKey];
        [addressDictionary setObject:@"" forKey:(NSString *)kABPersonAddressZIPKey];
        [addressDictionary setObject:@"" forKey:(NSString *)kABPersonAddressCountryCodeKey];
        //将字典放入多值对象中
        if ([p.type isEqualToString:kAddressType_Work]) {
            ABMultiValueAddValueAndLabel(multiAddress, CFBridgingRetain(addressDictionary), kABWorkLabel, NULL);
        }else if ([p.type isEqualToString:kAddressType_Home]){
            ABMultiValueAddValueAndLabel(multiAddress, CFBridgingRetain(addressDictionary), kABHomeLabel, NULL);
        }else{
            ABMultiValueAddValueAndLabel(multiAddress, CFBridgingRetain(addressDictionary), kABOtherLabel, NULL);
        }
    }
    ABRecordSetValue(person, kABPersonAddressProperty, multiAddress, NULL);
    ABAddressBookAddRecord(addressBook, person, nil);
    ABAddressBookSave(addressBook, NULL);
    if (multiAddress) {
        CFRelease(multiAddress);
    }
   

后来，我想起来了Instruments这个工具，可以查看僵尸对象。立即起profile。结果如下：

Zombie的地方是ABCMultiValueDestroy。但是，我注意到了AddressBookEngine的getAddress:函数。突然我恍然大悟，应该读取的时候CF和OC对象转换的问题。随机，我打开网址，转向ARC说明

__bridge只做类型转换，但是不修改对象（内存）管理权；
__bridge_retained（也可以使用CFBridgingRetain）将Objective-C的对象转换为Core Foundation的对象，同时将对象（内存）的管理权交给我们，后续需要使用CFRelease或者相关方法来释放对象；
__bridge_transfer（也可以使用CFBridgingRelease）将Core Foundation的对象转换为Objective-C的对象，同时将对象（内存）的管理权交给ARC。

那么问题，应该就在读取address的地方了：看代码

/**
 *  获取地址
 *
 *  @param recordRef 通讯录单个联系人引用
 *
 *  @return 地址
 */
-(NSDictionary*) getAddress:(ABRecordRef)recordRef{
        //1.判定
        if (recordRef == nil) {
            return nil;
        }
    NSMutableArray  *addressHome  = [[NSMutableArray alloc]init];
    NSMutableArray  *addressWork  = [[NSMutableArray alloc]init];
    NSMutableArray  *other   = [[NSMutableArray alloc]init];
    //2.创建字典，获取多键值列表
    NSMutableDictionary *multiValueDic = [[NSMutableDictionary alloc] initWithCapacity:1];
    ABMultiValueRef multiValueArr = ABRecordCopyValue(recordRef, kABPersonAddressProperty);
    //3.将多值，封装到字典中。
    int count = multiValueArr ? ABMultiValueGetCount(multiValueArr) : 0 ;
    if (count > 0) {
        count = (count <= kMaxAddressNumber?count:kMaxAddressNumber);
        for(int i = 0; i < count; i++) {
            @autoreleasepool {
                //lable
                //注意桥接,将CF对象转成OC对象。ARC下，自动释放OC对象:参考http://blog.csdn.net/hherima/article/details/16356577
                NSString* label = CFBridgingRelease(ABMultiValueCopyLabelAtIndex(multiValueArr,i));
                
                //value
                CFDictionaryRef dict = ABMultiValueCopyValueAtIndex(multiValueArr, i);
                NSString* street  =CFBridgingRelease( CFDictionaryGetValue(dict, kABPersonAddressStreetKey));
                NSString* city     =CFBridgingRelease( CFDictionaryGetValue(dict, kABPersonAddressCityKey));
                NSString* country  =CFBridgingRelease(CFDictionaryGetValue(dict, kABPersonAddressCountryKey));
                //CFRelease(dict);//应该删除
                
                NSString *syntheticAddress = [NSString stringWithFormat:@"%@%@%@"
                                              ,(street?street:@"")
                                              ,(city?city:@"")
                                              ,(country?country:@"")];
                
                if (label == nil || [label isEqualToString:@"_$!<Home>!$_"]){
                    [addressHome addObject:syntheticAddress];
                }
                else if([label isEqualToString:@"_$!<Work>!$_"]){
                    [addressWork addObject:syntheticAddress];
                }
                else{
                    [other addObject:syntheticAddress];
                }

            }
        }
        [multiValueDic setObject:addressHome forKey:@(EAdressBookType_AddressHome)];
        [multiValueDic setObject:addressWork forKey:@(EAdressBookType_AddressWork)];
        [multiValueDic setObject:other forKey:@(EAdressBookType_AddressOther)];
    }
    //4.释放CF对象
    if (NULL != multiValueArr) {
        CFRelease(multiValueArr);
        multiValueArr = NULL;
    }

    return multiValueDic;
}

问题就出在：

 CFRelease(dict);

由于我已经使用了CFBridgingRelease，说明不需要在releasedict这个对象了。主要是上面的代码，是从网上copy的。没有改