一、字典中套数组
1. 通讯录（根据名字首字母分组，打印联系人信息）
NSMutableDictionary *contactDic=[NSMutableDictionary dictionary];
for (char c = 'A';c <= 'Z'; c++) {
NSString *key = [NSString stringWithFormat:@"%c",c];
NSMutableArray *contactArray = [NSMutableArray array];
[contactDic setObject:contactArray forKey:key];
//效果与上句话相同
}
Contact *contact=[[Contact alloc] initWithName:@"张宇" phoneNumber:@"150123477889" group:@"Z"];
//判断姓名和电话号是否为空
if (contact.name != nil && contact.name.length != 0 && contact.phoneNumber != nil&& contact.phoneNumber.length != 0) {
NSMutableArray *contactArray = [contactDic objectForKey:contact.group];
[contactArray addObject:contact];
}else{
NSLog(@"姓名或电话号不能为空");
}
NSArray *keyArray = contactDic.allKeys;
for (int i = 0; i < keyArray.count; i++) {
NSString *key = keyArray[i];
NSMutableArray *contactArray = [contactDic objectForKey:key];
for (int j = 0; j < contactArray.count; j++) {
Contact *contact = contactArray[j];
[contact showInfo];
}
}
二.综合应用实例（各个省市列表）
NSMutableArray *provinceArray = [NSMutableArray array];
//加载文件得到相关数据
NSString *contentStr = [NSString stringWithContentsOfFile:@"/Users/lanou3g/Downloads/area.txt" encoding:NSUTF8StringEncoding error:nil];
//将数据以/n分割成一行一行的数据装进数组
NSArray *lineArray = [contentStr componentsSeparatedByString:@"/n" ];
//遍历数组，判断他是省名、城市名还是区名并执行相关的操作
for (NSString *lineString in lineArray) {
if (![lineString hasPrefix:@" "]) {
//省名就创建省字典，并为其添加相应键值对装进省数组中
NSMutableDictionary *provinceDic = [NSMutableDictionary dictionary];
//provinceName：城市名 cityArray：城市字典
[provinceDic setObject:lineString forKey:@"provinceName"];
NSMutableArray *cityArray = [NSMutableArray array];
[provinceDic setObject:cityArray forKey:@"cityArray"];
//添加到城市字典
[provinceArray addObject:provinceDic];
}else if(![lineString hasPrefix:@" "]){
//城市名就获取该城市对应的省字典，创建城市字典，添加相应键值对最后将其装进城市数组中
NSMutableDictionary *provinceDic = [provinceArray lastObject];
NSMutableArray *cityArray = [provinceDic objectForKey:@"cityArray"];
NSMutableDictionary *cityDic = [NSMutableDictionary dictionary];
[cityDic setObject:lineString forKey:@"cityName"];
NSMutableArray *areaArray = [NSMutableArray array];
[cityDic setObject:areaArray forKey:@"areaArray"];
[cityArray addObject:cityDic];
}else{
//获取区对应的省字典
NSMutableDictionary *provinceDic = [provinceArray lastObject];
//获取区对应的城市数组
NSMutableArray *cityArray = [provinceDic objectForKey:@"cityrray"];
//取出区对应的城市字典
NSMutableDictionary *cityDic = [cityArray lastObject];
//取出存放地区的地区数组
NSMutableArray *areaArray=[cityDic objectForKey:@"areaArray"]；
//将地区名添加到数组中
[areaArray addObject:lineString];
}
}
//遍历取出数据打印在控制台
for (NSMutableDictionary *provinceDic in provinceArray) {
NSLog(@"%@",[provinceDic objectForKey:@"provinceName"]);
for (NSMutableDictionary *cityDic in [provinceDic objectForKey:@"cityArray"]) {
NSLog(@"%@",[cityDic objectForKey:@"cityName"]);
for (NSString *areaName in [cityDic objectForKey:@"areaArray"]) {
NSLog(@"%@",areaName);
}
}
}
