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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); }程序崩溃在 ABAddressBookSave(addressBook, NULL); 百思不得其解,google上查阅了很多资料,看看是不是“多值”的对象使用错了,还是代码顺序的问题。都没有结果。
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; }在找到具体问题之前,我做了一个假设。如果从一开始就此函数return掉,如果不崩溃,说明就是后续代码的问题。果不其然!
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
iOS 修改通讯录联系人地址(address)崩溃原因分析