"Learning iOS Path: objective-c" Array, string, dictionary sum exercises

①. Implementation method: 13 People, 3 people a group, with a large array to manage each grouping.

            1. Original array          Nsarray *array = @[@1,@2,@3,@4,@5,@6,@7,@8,@9,@10,@11,@12,@13];                2. Number of original arrays        Nsinteger count = [array count];        3. Create a mutable array of 1.        Nsmutablearray *newarray = [[Nsmutablearray alloc] init];        4. Loop        for (Nsinteger i = 0;i < count; i++)        {                    //3, initialize a mutable array of 2            if (0 = = i% 3) {                Nsmutablearray *newarray1 = [[Nsmutablearray alloc] initwithcapacity:1];                Adds a variable array of 2 to a mutable 1.                [NewArray addobject:newarray1];                [NewArray1 release];               }        Gets the last element in the mutable array 1, which can be variable group 2.        Adding elements to a mutable array 2        [[NewArray Lastobject] addobject:array[i];        }              Output        NSLog (@ "%@", NewArray);        [NewArray release];        

②. processing? text information in the document Crayons.txt, the text content is about the color, every line is? A color of the information, such as: Almond #EED9C4, before? A string is the name of color, after? A string is the color of the color of the 16? To handle the text, complete the following requirements:
1, to use a dictionary to manage all the color, that is, the dictionary is stored in a number of key-value pairs, Yan-color name is key,16? Color value (without #) is value.
2. Remove all keys and arrange them in ascending order.
3. Take out all the value and arrange it according to the sorted key.
4, make? A new dictionary to manage the color, the color into the line classification management, namely: "A", "B", "C" ... That is, the dictionary contains multiple key-value pairs, key is 26 characters? The value is an array, and the array is a color object (containing name and ColorValue). You need to create a color class from yourself.
The implementation is as follows:

1. The code inCrayons.txt is as follows

Almond #EED9C4Antique Brass #C88A65Apricot #FDD5B1Aquamarine #71D9E2Asparagus #7BA05BAtomic Tangerine #FF9966Banana Mania #FBE7B2Beaver #926F5BBittersweet #FE6F5EBlack #000000Blizzard Blue #A3E3EDBlue #0066FFBlue Bell #9999CCBlue Green # 0095b6blue Violet #6456B7Brick Red #C62D42Brink Pink #FB607FBrown #AF593EBurnt Orange #FF7034Burnt Sienna #E97451Cadet Blu E #A9B2C3Canary #FFFF99Caribbean Green #00CC99Carnation Pink #FFA6C9Cerise #DA3287Cerulean #02A4D3Chartreuse # Ff9966chestnut #B94E48Copper #DA8A67Cornflower #93CCEACotton Candy #FFB7D5Cranberry #DB5079Dandelion #FED85DDenim # 1560BDDesert Sand #EDC9AFEggplant #614051Electric Lime #CCFF00Fern #63

The specific code is as follows:

     Get file path NSString *filepath = @ "/users/object-c daily job/crayons.txt";//file address//read string in file NSString *oldstring = [N    Sstring Stringwithcontentsoffile:filepath encoding:nsutf8stringencoding Error:nil];    The file is first manipulated to remove the contents of each line.                Nsarray *array = [oldstring componentsseparatedbystring:@ "\ n"];    1, to use a dictionary to manage all the color, that is, the dictionary is stored in a number of key-value pairs, Yan-color name is key,16? Color value (without #) is value.    Initializes a dictionary nsmutabledictionary *dictionary = [[Nsmutabledictionary alloc] init]; Iterates through each row in the array for (NSString *newstring in array) {//splits each row, returns the array nsarray *arr = [NewString Co            mponentsseparatedbystring:@ "#";            The values in the array are taken out and added to the data dictionary.        [Dictionary setobject:arr[1] forkey:arr[0];               }//2, remove all keys in ascending order.        Nsarray *allkey = [dictionary AllKeys];  Nsarray *newkey = [Allkey sortedarrayusingcomparator:^ (ID obj1, id obj2) {return [(NSString *) obj1 Compare :(NSString *)OBJ2];               }];               NSLog (@ "--------%@", NewKey);        3. Remove all the value and arrange it according to the sorted key.        Remove all value values nsmutablearray *allvalue = [[Nsmutablearray alloc] init];            For (NSString *key in NewKey) {nsstring *value = [dictionary Objectforkey:key];        [Allvalue Addobject:value]; }//4. Use a new dictionary to manage the color, the color into the line classification management, namely: "A", "B", "C" ... That is, the dictionary contains multiple key-value pairs, key is 26 characters? The parent, value is an array, an array? The Color object (including name and ColorValue) is stored.              You need to create a color class.                1. Go through the dictionary first, take out the corresponding key and value values, and store them inside each color object.       Newly established dictionary nsmutabledictionary *newdictionary = [[Nsmutabledictionary alloc] init];        Nsmutablearray *newarray = [[Nsmutablearray alloc] init];            For (NSString *keys in dictionary) {//Create a Color object, add each key and value that is removed from the dictionary.            Color *color = [[Color alloc] init]; [Color Setcolorname:keys];             Add colorname [Color setcolorcode:[dictionary objectforkey:keys]];//Add ColorCode         Gets the first letter of the colorname of the Color object, nsstring *str = [[Color colorname] substringtoindex:1];            Case conversion NSString *string = [str uppercasestring];            NSLog (@ "s======string=%@", string); Determine if the dictionary exists key Nsmutablearray *value = [newdictionary objectforkey:string];//key color capital letters when key//nslog (            @ "s=======%@", value); Determine if there is an if (value = = nil) {//does not exist//build Array value = [Nsmutablearray                Array];                [NewArray Addobject:color];            [Newdictionary Setobject:value forkey:string];                                } [value Addobject:color];    } NSLog (@ "%@", newdictionary); }

The Color object properties are as follows:

@property (nonatomic, retain) nsstring *colorname; @property (nonatomic, retain) NSString *colorcode;

"Learning iOS Path: objective-c" Array, string, dictionary sum exercises