标签：
①.实现方法:13个人,3个人一组,用一个大数组来管理每一个分组.
//1.原数组
NSArray *array = @[@1,@2,@3,@4,@5,@6,@7,@8,@9,@10,@11,@12,@13];
//2.原数组个数
NSInteger count = [array count];
//3.新建一个可变的数组1.
NSMutableArray *newArray = [[NSMutableArray alloc] init];
//4.循环
for (NSInteger i = 0;i < count; i++)
{
//判断每3个,初始化一个可变数组2
if (0 == i % 3) {
NSMutableArray *newArray1 = [[NSMutableArray alloc] initWithCapacity:1];
//将可变数组2添加到可变数组1中.
[newArray addObject:newArray1];
[newArray1 release];
}
//获取可变数组1中的最后一个元素,即可变数组2.
//给可变数组2添加元素
[[newArray lastObject] addObject:array[i]];
}
//输出
NSLog(@"%@",newArray);
[newArray release];
1.crayons.txt中代码如下
Almond #EED9C4 Antique Brass #C88A65 Apricot #FDD5B1 Aquamarine #71D9E2 Asparagus #7BA05B Atomic Tangerine #FF9966 Banana Mania #FBE7B2 Beaver #926F5B Bittersweet #FE6F5E Black #000000 Blizzard Blue #A3E3ED Blue #0066FF Blue Bell #9999CC Blue Green #0095B6 Blue Violet #6456B7 Brick Red #C62D42 Brink Pink #FB607F Brown #AF593E Burnt Orange #FF7034 Burnt Sienna #E97451 Cadet Blue #A9B2C3 Canary #FFFF99 Caribbean Green #00CC99 Carnation Pink #FFA6C9 Cerise #DA3287 Cerulean #02A4D3 Chartreuse #FF9966 Chestnut #B94E48 Copper #DA8A67 Cornflower #93CCEA Cotton Candy #FFB7D5 Cranberry #DB5079 Dandelion #FED85D Denim #1560BD Desert Sand #EDC9AF Eggplant #614051 Electric Lime #CCFF00 Fern #63具体代码如下:
//获取文件路径
NSString *filePath = @"/Users/Object-c日常作业/crayons.txt";//文件地址
//读取文件中的字符串
NSString *oldString = [NSString stringWithContentsOfFile:
filePath encoding:NSUTF8StringEncoding error:nil];
//先对文件进行操作去除每一行的内容.
NSArray *array = [oldString componentsSeparatedByString:@"\n"];
// 1、使?用字典管理所有的颜?色,即字典中存储的是多个键值对,
颜?色名称为 key,16进制颜?色值(不带#)是value。
//初始化一个字典
NSMutableDictionary *dictionary = [[NSMutableDictionary alloc] init];
//遍历数组中的每一行
for (NSString *newString in array) {
//对每一行进行分割,返回数组
NSArray *arr = [newString componentsSeparatedByString:@" #"];
//将数组中的值取出来,添加到数据字典.
[dictionary setObject:arr[1] forKey: arr[0]];
}
//2、取出所有的key,升序排列。
NSArray *allKey = [dictionary allKeys];
NSArray *newKey = [allKey sortedArrayUsingComparator:^(id obj1 ,id obj2) {
return [(NSString *)obj1 compare :(NSString *)obj2];
}];
NSLog(@"--------%@",newKey);
//3.取出所有的value,按照排序后的key排列。
//取出所有的value值
NSMutableArray *allValue = [[NSMutableArray alloc] init];
for (NSString *key in newKey) {
NSString *value = [dictionary objectForKey:key];
[allValue addObject:value];
}
//4.使?用?一个新的字典管理颜?色,对颜?色进?行分类管理,即:
“A”,“B”,“C”... 即这个字典包含多个键值对,key是26个字?母,
value是数组,数组?存放的是 Color对象(包含name和colorValue)。需要?己创建Color类。
//1.先遍历字典,取出对应的key和value值,存放在每个Color对象内.
//新建立字典
NSMutableDictionary *newDictionary = [[NSMutableDictionary alloc] init];
// NSMutableArray *newArray = [[NSMutableArray alloc] init];
for (NSString *keys in dictionary) {
//创建color对象,添加从字典中取出的每一个key和value值.
Color *color = [[Color alloc] init];
[color setColorName:keys]; //添加colorName
[color setColorCode:[dictionary objectForKey:keys]];//添加colorCode
//获取Color对象的colorName的首字母,
NSString *str = [[color colorName] substringToIndex:1];
//大小写转换
NSString *string = [str uppercaseString];
//NSLog(@"s======string=%@",string);
//判断字典中是否存在key
NSMutableArray *value = [newDictionary objectForKey:string];//键color大写字母当key
//NSLog(@"s=======%@",value);
//判断是否存在
if (value == nil) {
//不存在
//建立数组
value = [NSMutableArray array];
//[newArray addObject:color];
[newDictionary setObject:value forKey:string];
}
[value addObject:color];
}
NSLog(@"%@",newDictionary);
}
color对象属性如下:
@property (nonatomic, retain) NSString *colorName; @property (nonatomic, retain) NSString *colorCode;
【学习ios之路:Objective-C】数组,字符串,字典的总和练习
标签：
原文地址：http://blog.csdn.net/zfx5130/article/details/42464151
