01-IOSCore - NSString、NSFileManager、NSBundle、StringAndObjectConvert

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:@"\n"];

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];

}

}