模型
1 将数据存储到硬盘，将硬盘上的数据在读回内存
2 文件存储：
NSFileHandle 对文件的读写
NSData 二进制数据
NSString 表示文件路径
NSFileManager(对文件的操作创建、删除、改名、是不是文件夹)
【day0101_NSString】：NSString读取存储用法
NSString 路径用于表达文件的位置(/User/Apple/yz/docu...)
相对路径 apple/
绝对路径 /User/Apple
- (void)viewDidLoad
{
[superviewDidLoad];
NSString *path = @"/Users/tarena/yz/day01";
NSString *path2 = [path stringByAppendingPathComponent:@"use"]; // 生成新的字符串
NSLog(@"%@",[path stringByAppendingPathComponent:@"use"]);
// 拆分一个路径的component
NSArray *components = [path pathComponents];
[components enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
NSLog(@"%@",obj);
}];
// /User/apple/documents/ios core
// -> day20/nsstring/nsstring/main.m
NSString *path3 = @"/User/apple/documents/ios core";
NSString *path4 = @"day20/nsstring/nsstring/main.m";
NSString *newPath = [path3 stringByAppendingPathComponent:path4];
NSLog(@"%@",newPath);
// 追加文件后缀
path = [path stringByAppendingPathComponent:@"111"];
path = [path stringByAppendingPathExtension:@"jpg"]; // 补.
NSLog(@"%@",path);
// 取出文件的扩展名
path = @"/user/yz/a.jpg";
path = [path pathExtension];
NSLog(@"%@",path);
// 单词首字母大写
path = @"i love obc";
path = [path capitalizedString];
NSLog(@"%@",path);
path = [path uppercaseString]; // 全部大写
path = [path lowercaseString]; // 全部小写
NSLog(@"%@",path);
int i = [path hash];
NSLog(@"%d",i);
// 获取文件名或文件夹名
path = @"/use/sdg/gg.jpg";
NSLog(@"%@",[path lastPathComponent]);
// 获取父目录
path = @"/a/b/c/d.jpg";
NSLog(@"%@",[path stringByDeletingLastPathComponent]);
NSLog(@"%@",[path stringByDeletingPathExtension]);// 去除扩展名 /a/b/c/d
}
【day0102_NSFileManager】：文件管理器
NSFileManager(对文件的操作创建、删除、改名、是不是文件夹)
fileExistsAtPath 检测文件是否存在并判断是否是文件夹
createDirectoryAtPath 参数YES表示如果创建文件夹时如果中间没有那个文件夹会自动创建
- (void)viewDidLoad
{
[superviewDidLoad];
self.fileManager = [NSFileManagerdefaultManager];
// 检查文件是否存在
NSString *path = @"/Users/tarena/yz/第一阶段(OC-Fd)/Foundation";
if ([self.fileManagerfileExistsAtPath:path]) {
NSLog(@"文件存在");
}
BOOL isDirectory = NO;
if ([self.fileManagerfileExistsAtPath:path isDirectory:&isDirectory]) {
if (isDirectory) {
NSLog(@"是文件夹");
}
}
// 创建文件夹
NSString *createDirectory = @"/Users/tarena/Desktop";
// 参数YES表示如果创建文件夹时如果中间没有那个文件夹会自动创建
[self.fileManagercreateDirectoryAtPath:[createDirectory stringByAppendingPathComponent:@"myDirectory/dir/dir/dir"] withIntermediateDirectories:YESattributes:Nilerror:Nil]; // 如果用NO那么创建文件夹的父文件必须存在才能创建
// 练习
// /Users/tarena/yz/第三阶段(UI核心_Model赵哲)/day01
// QQ/Users
// 10086
// images
// cache
// download
// history
// 10010
// images
// cache
// download
// history
// 10000
// images
// cache
// download
// history
NSString *rootPath = @"/Users/tarena/yz/第三阶段(UI核心_Model赵哲)/day01";
NSString *usersDirectory = @"QQ/Users";
NSArray *users = @[@"10086",@"10010",@"10000"];
NSArray *directorys = @[@"images",@"cache",@"download",@"history"];
for (NSString *user in users) {
for (NSString *directory in directorys) {
[self.fileManagercreateDirectoryAtPath:[rootPath stringByAppendingPathComponent:[usersDirectory stringByAppendingPathComponent:[user stringByAppendingPathComponent:directory]]] withIntermediateDirectories:YESattributes:Nilerror:Nil];
}
}
NSString *path2 = @"/Users/tarena/Desktop";
NSArray *directoryArray = [self.fileManagercontentsOfDirectoryAtPath:path2 error:Nil];
NSLog(@"%@",directoryArray);
// 遍历文件夹下所有的子文件夹
for (NSString *subDirectory in directoryArray) {
NSString *directoryPath = [path2 stringByAppendingPathComponent:subDirectory];
BOOL isDirectory = NO;
if ([self.fileManagerfileExistsAtPath:directoryPath isDirectory:&isDirectory] && isDirectory) {
NSLog(@"子文件夹名:%@",subDirectory);
}
}
}
【day0103_Sandbox】：Sandbox沙箱
NSHomeDirectory() 获取app根路径
[[NSBundle mainBundle] resourcePath] 获取沙箱根路径
// 获取app根路径
NSString *homePath = NSHomeDirectory();
NSLog(@"%@",homePath);
// 获取沙箱根路径
NSString *bundle = [[NSBundlemainBundle] resourcePath];
NSLog(@"%@",bundle);
// 使用fileManagager获取documents路径
NSFileManager *fileManager = [NSFileManagerdefaultManager];
NSArray *urls = [fileManager URLsForDirectory:NSDocumentDirectoryinDomains:NSUserDomainMask];
NSURL *url = urls[0];
NSString *documentsPath = [url path]; // 发送path消息将url转为字符串
NSLog(@"%@",documentsPath);
// 获取缓存目录
NSURL *url2 = [fileManager URLsForDirectory:NSCachesDirectoryinDomains:NSUserDomainMask][0];
NSLog(@"%@",[url2 path]);
// 获取tmp目录
NSString *tmpPath = NSTemporaryDirectory();
NSLog(@"%@",tmpPath);
【day0104_Note便签】
保存和读取
- (IBAction)barButtonReadNote:(id)sender {
NSString *notePath = [NSHomeDirectory() stringByAppendingPathComponent:@"note.txt"];
NSString *stringNote = [NSStringstringWithContentsOfFile:notePath encoding:NSUTF8StringEncodingerror:Nil];
self.textViewNote.text = stringNote;
}
- (IBAction)barButtonSaveNote:(id)sender {
NSString *stringNote = self.textViewNote.text;
NSString *notePath = [NSHomeDirectory() stringByAppendingPathComponent:@"note.txt"];
[stringNote writeToFile:notePath atomically:YESencoding:NSUTF8StringEncodingerror:Nil];
self.textViewNote.text = @"";
}
【day0105_StringAndObject】：字符串和对象之间的转换
/*
作业
0. 复习
1. TMessage 保存
读取
Documents/messages.txt
1|TXT|今天真高兴
0|TXT|那真是太好了
1|TXT|你在干什么？
0|TXT|我正在帮助全世界的人过上更好的生活
1|TXT|这么好
0|TXT|谢谢你的夸奖，我都害羞了，呵呵
文件 -> 字符串 -> 数组(字符串) -> 数组(对象) -> TRMessageViewController
存储*
点击发送的时候
1) 数组增加对象
2) tableview插入动画
insertRowsAtIndexPathes:withRowAnimation:
3) 把数组的对象翻译成换行的字符串
4) 写入文件
*/
- (void)viewDidLoad
{
[superviewDidLoad];
NSString *home = NSHomeDirectory();
NSLog(@"%@",home);
// 文件 -> 字符串
NSFileManager *fileManager = [NSFileManagerdefaultManager];
NSString *documentPath = [[fileManager URLsForDirectory:NSDocumentDirectoryinDomains:NSUserDomainMask][0] path];
NSLog(@"%@",documentPath);
NSString *stringFromFile = [NSStringstringWithContentsOfFile:[documentPath stringByAppendingPathComponent:@"messages.txt"] encoding:NSUTF8StringEncodingerror:Nil];
NSLog(@"%@",stringFromFile);
// 字符串 -> 数组(字符串)
NSArray *arrayFromString = [stringFromFile componentsSeparatedByString:@" "];
NSLog(@"%@",arrayFromString);
// 数组(字符串) -> 数组(对象)
for (NSString *string in arrayFromString) {
NSArray *messageFromString = [string componentsSeparatedByString:@"|"];
MXMessagesViewController *messageViewController = [[MXMessagesViewControlleralloc] init];
messageViewController.message = messageFromString[2];
messageViewController.state = messageFromString[0];
}
}