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
[objc] view plaincopy
- //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
[objc] view plaincopy
- /**
- * 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
http://blog.csdn.net/hherima/article/details/41594273