OC第四讲 数组字典集文档格式.docx

1、,newString）; /可变字符串删除 /遍历可变字符串，进行删除#pragma mark -2、随机获得100个50-100的数字字符串，存入一个数组，最后打印输出这个数组（arc4random（） /2/ NSMutableArray *mutableArray = NSMutableArray arrayWithCapacity:100;/ for （int i = 0; i 100; i +） / NSString * string = NSString stringWithFormat:%d,arc4random（） % 51 + 50;/ mutableArray addObj

2、ect:string;/ / NSLog（compare = %,mutableArray sortedArrayUsingSelector:selector（compare:）;/ NSLog（mutableString = %,mutableArray）;fjjj= %ld,mutableArray.count）;/ / NSSet *set = NSSet setWithArray:mutableArray;set = %,set）;#pragma mark - 3、 创建一个Student类，将学员信息存放进一个字典，将3个学员信息的字典存放到一个数组 / 4、 选取第一个学员和最后一

3、个学员输出其姓名，并计算他们年龄的差值 / 5、自学NSSet，然后讲第二题中的重复数字去掉，输出结果数组 Student * student1 = Student studentWithName:tom1 age:20 gender:男 code:110101199403021210 Student * student2 = Student alloc initWithName:tom214女110101200010100303 Student * student3 = Student studentWithName:tom31211010120120303101 NSDictionary

4、* dictionary1 = student1.name : student1; NSDictionary * dictionary2 = student2.name : student2; NSDictionary * dictionary3 = student3.name : student3; NSArray * array = dictionary1, dictionary2, dictionary3;array = %,array）; Student * student = Student alloc init; int result = student differenceBet

5、weenAges:array;result = %d, result）; return 0;Student.h文件interface Student : NSObject NSString * _name;/姓名 NSInteger _age;/年龄 NSString *_gender;/性别 NSString * _code;/身份证号- （instancetype）initWithName:（NSString *）name（NSInteger）age（NSString *）gender（NSString *）code;+ （instancetype）studentWithName:- （v

6、oid）setName:（NSString *）name;- （NSString *）name;- （NSInteger）age;- （int）differenceBetweenAges:（NSArray *）array;- （NSComparisonResult）compareAge:（Student *）student;endStudent.m文件implementation Student（NSString *）code / NSLog（%s, _FUNCTION_）; self = super init; if （self） _name = name; _age =age; _gend

7、er = gender; _code = code; return self; Student * student = Student alloc initWithName:nameagegendercode; return student;- （NSString *）name return _name;- （NSInteger）age return _age;（NSArray *）array NSMutableArray * array1 = NSMutableArray arrayWithArray: NSDictionary *dictionary1 = array10;arr = %,

8、array10）; Student * student1 = dictionary1 allValues firstObject;value = %,dictionary1 allValues）; NSDictionary *dictionary2 = array12; Student * student2 = dictionary2 allValues firstObject;student1 name = %,student2 name = %,student1.name,student2.name）; /取到学生年龄 /得到差值 return abs（int）student1.age -

9、 （int）student2.age）;（Student *）student if （_age return NSOrderedDescending; return NSOrderedSame;- （NSString *）description return NSString stringWithFormat:name:%,age:%ld,gender:%,code:%, _name, _age, _gender, _code;课堂代码/ 0521/ Copyright （c） 2015年 ruifeng. All rights reserved.Person.h NSString *stri

10、ng =abc NSString *string1 =cd NSInteger count = 3; NSNumber *number = NSNumber numberWithInteger:3; NSInteger counts3; /oc中的集合 /1.只能放对象 /2.基本数据类型需要格式化才能放 /3.每个元素都不能为nil，所有元素依次放完，最后添加nil作为结束符 NSArray *array = NSArray arrayWithObjects:0,string,string1,nil; NSArray *array1 = NSArray arrayWithObjects:st

11、ring,string1,nil; /数组的3个初始化 NSArray *array0 = NSArray allocinitWithObjects:string1,string,nil; NSArray *array2 = string,string1;/不要加nil /数组的操作 /取值 index id string4 = array objectAtIndex:0; string4 appendFormat:ab NSString *string5 = array objectAtIndex:1;/取到的值必须与存放 array firstObject; array lastObjec

12、t; /截取数组/ NSArray *newArray = array subarrayWithRange:（0,2）; /拼接数组 NSArray *newArray19 = array arrayByAddingObject: /1,2345 / NSArray *array7 = / array7 NSArray *array8 = NSArray arrayWithObjects:,nil; NSArray *array9 = array7 arrayByAddingObjectsFromArray:array8;,array9）; /数组与字符串的转化 NSString *strin

13、gAll= array9 componentsJoinedByString: NSArray *array10 = stringAll componentsSeparatedByString:,stringAll）; /数组排序 NSArray *numbers =011112 SEL sel = selector（compare:）; NSArray *sortedArray = numbers sortedArrayUsingSelector:sel;,sortedArray）; NSString *text = good morning ios program/ NSString *ch

14、ars = asfesfiuahgfiasghisag/ NSArray *charects = chars componentsSeparatedByCharactersInSet:,sortedArray） /将它按照单词首字母排序，并生成新的字符串 NSArray *words = text componentsSeparatedByString: /将语句用空格分割，成单词的数组,words）; NSArray *sortedWords = words sortedArrayUsingSelector:）; NSString *newText = sortedWords compone

15、ntsJoinedByString:/用空格,newText）;/= /字典 索引 /字典：用键值对（key-value）的形式存放对象数据的集合 NSDictionary *dic = NSDictionary allocinitWithObjectsAndKeys:张三name NSDictionary *dic1 = NSDictionary allocdictionaryWithObjectsAndKeys: NSDictionary *dic2 = :, age20;/key-value,key在前，每个键值对为一个元素,dic2）; NSDictionary *dic3 = NSD

16、ictionary dictionaryWithObjects:123456789 forKeys:7;,dic3）; /假设一个人有姓名，年龄， Person *per = Person allocinit; per.name = Tom per.age = 20; per.birthday =19880920 NSDictionary *personInfo = NSDictionary dictionaryWithObjectsAndKeys:per.name, per.age, per.birthday,birthday NSLog（,personInfo）; /建立一个新的Perso

17、n，将字典中的数据取出来放到它的属性里 Person *newPerson = Person allocinit; newPerson.name = personInfo objectForKey: newPerson.age = personInfo objectForKey:integerValue; newPerson.birthday = personInfo objectForKey: NSDictionary *personInfo = NSDictionary /研究性知识点：KVC /字典中不可能出现相同的key /字典也不能放nil /mutable 数组和字典的遍历运算 N

18、SMutableArray *mArray = NSMutableArray array; mArray addObject:def/数组添加元素，直接加在最后,mArray）; mArray removeObject:/移除所有等于它的元素 mArray removeObjectAtIndex:/只移除那个位置上的元素,mArry）; /可变数组的其他方法 mArray insterObject:ghi atIndex:/插入到指定下标的位置 /排序 mArray sortUsingSelector: /将20个120的随机数字字符串放到数组，并排序 NSMutableArray *numb

19、erArray array; for （NSInteger i=0;i10） deleteArray addObject:aNumber; numberArray removeObjectsInArray:deleteArray;,numberArray; /NSMutableDictionary NSMutableDictionary *mDic = NSMutableDictionary dictionary; mDic setObject: forKey: mDic removeObjectForKey:/操作字典，绝大部分情况都是操作key /字典的遍历（重点） for （NSString *key in mDic） ,sring）; NSString *value = mDic objectForKey:key; /如果要删除，保存要删除的key，循环结束之后一次性删/ id obj 2 = string,string1;/ NSArray *array3 = NSArray arrayWithObjects:objs count:2;