http://api.yytianqi.com/citylist/id/1

结合省市区的json数据解析出来，取出所有城市，放入数组，将数组写入plist

"city_id": "CH010100",

"name": "北京",

"en": "Beijing"

如下：

NSString *file = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES).firstObject;

NSString *filePath = [file stringByAppendingPathComponent:@"MyCity.plist"];

NSFileManager *manager = [NSFileManager defaultManager];

NSDictionary *chinaDic= [dic objectForKey:@"list"];//34个省份

NSMutableArray *newArr = [NSMutableArray array];

for (NSDictionary *shengDic in chinaDic) {

NSDictionary *sDic = [shengDic objectForKey:@"list"];//省份里的市

for (NSDictionary *shiDic in sDic) {

NSDictionary *cDic = [shiDic objectForKey:@"list"];

if (cDic == nil) {//直辖市只有一个市

[newArr addObject:shiDic];

} else {//省有多个市

for (NSDictionary *quDic in cDic) {

[newArr addObject:quDic];

}

}

}

}

if ([manager createFileAtPath:filePath contents:nil attributes:nil] == YES) {

[newArr writeToFile:filePath atomically:YES];

}

最终的plist中数据格式如下