Deep copy is only a copy of the outer layer. I need an array element that is exactly the same as the old array, but the element addresses of all child elements and child elements are not the same.
the current idea is to nest and traverse all elements, but I am not familiar with nesting, so I can"t implement it for the time being. Ask God to help me write a method.
official documentation: Apple Documentation on copying collections
according to the documentation, there are several types of deep copies
A convenient way to copy an array is to use the initWithArray:copyItems: method to set copyItems to YES
NSArray *deepCopyArray=[[NSArray alloc] initWithArray:array copyItems:YES];use NSKeyedArchiver for archiving, then unfile, and make a deep copy
NSArray *trueDeepCopyArray = [NSKeyedUnarchiver unarchiveObjectWithData:
[NSKeyedArchiver archivedDataWithRootObject:oldArray]];Previous: Where does Mini Program define the navigation bar style after setting "navigationStyle": "custom"?
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