iOS Development-Interview Summary (14)

Interview Summary (iv) Realization of an ordered dictionary

Implementation method

1. Press Nsdictionary key to sort it:
2. Put the value of the dictionary into a dictionary, and key uses an ordered string, respectively.
3. First the dictionary to the model, and then into the array
4. The AllKeys of the Dict is assigned to an array and then sorted by the Sortedarrayusingcomparator: method, and then the value of the dictionary corresponding to the key is OK.

This is just about the implementation of the two methods.

Method One

1 Nsarray *keys = [Dict allkeys];2 nsarray *sortedarray = [Keys Sortedarrayusingcomparator:^nscomparisonresult (idobj1, ID OBJ2) {3 return [obj1 compare:obj2 options:nsnumericsearch];4}];5 for (NSString *categoryid in Sortedarray) {6 ... 7 NSLog (@ "[dict objectforkey:categoryid] = = =%@", [Dictobjectforkey:categoryid]); 8}

Method Two:

1 NSString *filepath = [[NSBundle mainbundle]pathforresource:@ "Students" oftype:@ "plist"];2 nsdictionary *stuDic = [ Nsdictionary dictionarywithcontentsoffile:filepath];3 Self.studentindexarray = [Nsmutablearray arrayWithCapacity:1] ; 4 Nsarray *arr = [[Studic AllKeys] Sortedarrayusingselector: @selector (compare:)];

iOS Development-Interview Summary (14)