Nsset Basic Use

1 intMainintargcConst Char*argv[]) {2 @autoreleasepool {3 4         //Create a Collection object Note: If the collection has been written two or more times the same object is printed only to see one5Nsset *set1 = [[Nsset alloc] Initwithobjects:@" One",@" Both",@"three",@"three", nil];6         //Note: The outermost layer inside the set is the curly brace and then the parentheses7         //The collection is unordered it is hashed hash sort "data structure" hash algorithm8NSLog (@"%@", Set1);9         Ten         //the number of elements in the collection OneNSLog (@"number of collections:%ld", [Set1 Count]); A          -          -         //whether to include an element theBOOL contains = [Set1 containsobject:@" Both"]; -NSLog (@"contains:%d", contains); -          -         //whether two collections are equal +Nsset *set2 = [Nsset setwithobjects:@" One",@" Both",@"three",@" Four", nil]; -BOOL isequal =[Set1 Isequaltoset:set2]; +  A         if(isequal) { atNSLog (@"two sets equal"); -}Else { -NSLog (@"two sets are not equal"); -         } -          -      in         //determines whether the first collection is a subset of the second set -  toBOOL Issubset =[Set1 Issubsetofset:set2]; +NSLog (@"whether it is a sub-collection:%d", issubset); -          the          *         //enumeration traversal for while Do-while Forin enumerator $         //Collection enumerator that takes set2 often iterates through the collection with enumeratorsPanax NotoginsengNsenumerator *enumerator =[Set2 objectenumerator]; -NSString *str; the         //Nextobject Next Element +          while(str =[Enumerator Nextobject]) { ANSLog (@"%@", str); the         } +          -         //to create a collection by way of an array (the array turns into a collection) $Nsset *set3 = [Nsset setwitharray:@[@" One",@"Five"]]; $NSLog (@"set3:%@", Set3); -         //View collection All elements return an array (collection to group) -Nsarray *array1 =[Set3 allobjects]; theNSLog (@"array1:%@", array1); -         Wuyi          the         /******** variable set *******/ -         //Create an empty collection WuNsmutableset *mset =[[Nsmutableset alloc] init]; -NSLog (@"%@", MSet); About          $         //Increase -         //adding a collection element -[MSet AddObject:@" One"]; -[MSet AddObject:@" One"]; A[MSet AddObject:@" Both"]; +[MSet AddObject:@"three"]; theNSLog (@"%@", MSet); -          $         //Delete the         //To delete a collection element the[MSet Removeobject:@" One"]; theNSLog (@"%@", MSet); the          -          in         //adding collections to the collection the [MSet Unionset:set2]; theNSLog (@"------%@", MSet); About          the         //When deleting a collection in a collection , if you want to delete more than one collection element in the collection, Mset does not collapse when this collection element is deleted. the //nsset *_set = [Nsset setwithobjects:@ "one", @ "one", @ "three", @ "four", @ "1", nil]; the  + //[MSet Minusset:_set]; - //NSLog (@ "======%@", MSet); the         Bayi         /******** index collection or index collection **********/ the         //Inherit NSObject the         //Create an index collection by creating an index collection in the specified range Note: Range do not exceed the range will crash - //nsindexset *set4 = [[Nsindexset alloc] Initwithindexesinrange:nsmakerange (2, 4)]; -          the         //creates an empty, mutable index collection theNsmutableindexset *set5 =[[Nsmutableindexset alloc] init]; the         //add subscript to a mutable index collection the[Set5 Addindex:0]; -[Set5 Addindex:2]; the[Set5 Addindex:3]; the[Set5 Addindex:6]; the         94          theNsarray *allarray = [[Nsarray alloc] Initwithobjects:@" One",@" Both",@"three",@" Four",@"Five",@"Six",@"Seven", nil]; the         //get an array from an indexed collection (array elements in range of index range) theNsarray *subarray =[Allarray Objectsatindexes:set5];98NSLog (@"++++++++%@", subarray); About          -     101     }102     return 0;103}

Nsset Basic Use