PHCollection localizedTitle crash in iOS 14.2.1

Question

Created May ’21

Replies 4

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Code Block languagePHFetchResult *topLevelUserCollections = [PHCollectionList fetchTopLevelUserCollectionsWithOptions:nil];
  for (NSInteger i = 0; i < topLevelUserCollections.count; i++) {
    PHCollection *collection = topLevelUserCollections[i];
    id value = collection.localizedTitle;
    NSLog(@"%@", value);
  }

this value is bad address

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Answer 1

DSperson667 OP

May ’21

this (NSString *) value = 0xa08fc90a9a686dc6 , not a string

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Answer 2

DSperson667 OP

May ’21

I found reason, my category NSString+Ext, swizzle rangeOfString：， but my method is

Code Block + (void)initialize

, I replace it with

Code Block + (void)load

, it word.

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Answer 3

Ajun OP

Sep ’22

https://github.com/SnowGirls/iCategory-NSString/tree/master/iCategory-NSString

https://github.com/SnowGirls/iCategory-NSString/blob/main/iCategory-NSString/NSString%2BExtension.m#L16

The reason is that your own +initialize method called, the original +[NSString initialize] method never be invoked once.

Reference: https://github.com/gnustep/libs-base/blob/efccdb1d71166cfe096f309a97747175f46c1435/Source/GSString.m#L3515

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Answer 4

Ajun OP

Sep ’22

Use dsc_extractor to extract the Foundation.framework out from the dyld_shared_cache_arm64, that pull down from iOS 15.6 (on $HOME/Library/Developer/Xcode/iOS\ DeviceSupport/15.6/Symbols/System/Library/Caches/com.apple.dyld/dyld_shared_cache_arm64e).
Drag it to Foundation.framework/Foundation to IDA64.

So, the reason is obvious, the +[NSString initialize] will enable/disable the NSTaggedPointerString feature. If u implement one in category, your app will not recognize a Tagged Pointer String.

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