I tried the answer but it still doesn't work. Can anyone help me to deal with it?
Here is the code.
CSSearchableItemAttributeSet *attributeSet = [[CSSearchableItemAttributeSet alloc]initWithItemContentType:(NSString *)kUTTypeItem];
attributeSet.title = @"TestName";
attributeSet.displayName = @"TestName";
attributeSet.contentDescription = @"TestName";
attributeSet.keywords = @[@"TestName"];
CSSearchableItem *item = [[CSSearchableItem alloc]initWithUniqueIdentifier:@"id" domainIdentifier:nil attributeSet:attributeSet];
[[CSSearchableIndex defaultSearchableIndex] indexSearchableItems:@[item] completionHandler: ^(NSError * __nullable error) {
NSLog(error? @"add searchItem fail": @"add searchItem success");
}];