iOS 简单的文件写入

//访问沙盒路径
/*
//1.Home主目录(沙盒主目录:里面有Documents,Library,tmp 和一个应用程序)
NSLog(@"%@",NSHomeDirectory());

//2.Documents
NSString *DocumentsPath=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0];

NSLog(@"Documents:%@",DocumentsPath);

//3.Library
NSString *LibraryPath=NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES)[0];
NSLog(@"Library:%@",LibraryPath);

//4.temp
NSLog(@"tmp:%@",NSTemporaryDirectory());

//5.Caches(Library下面的)
NSString *cachesPath=NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)[0];
NSLog(@"caches:%@",cachesPath);

//6.User
NSString *user=NSUserName();
NSLog(@"user:%@",user);

//7.NSBundle
NSString *bundle=[[NSBundle mainBundle]pathForResource:@"1" ofType:@"png"];
NSLog(@"bundle:%@",bundle);
*/

//简单文件写入
//NSString写入
//1.写入路径(往哪里写)
NSString *DocumentsPath=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0];
NSLog(@"%@",DocumentsPath);
//2.拼接文件路径
NSString *filePath=[DocumentsPath stringByAppendingString:@"/myText.txt"];
//3.准备写入的内容
NSString *content=@"hello world";
//4.写入 atomically:原子性 yes:全写 no:能写多少写多少
[content writeToFile:filePath atomically:YES encoding:NSUTF8StringEncoding error:nil];

//NSAyyay
//1.写入路径(同上)

//2.拼接文件路径
NSString *arrayFile=[DocumentsPath stringByAppendingString:@"/array.plist"];

//3.准备写入内容
NSArray *array=@[@"123",@"456",@"789"];

//4.写入
[array writeToFile:arrayFile atomically:YES];

//NSDictionary

//1.写入路径(同上)

//2.拼接文件路径
NSString *dictFile=[DocumentsPath stringByAppendingString:@"/dic.plist"];

//3.准备写入内容
NSDictionary *dict=@{@"1":@"a",@"2":@"b",@"3":@"c"};

//4.写入
[dict writeToFile:dictFile atomically:YES];

//5.读取
//NSString
NSString *readString=[NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:nil];
NSLog(@"%@",readString);

//NSArray
NSArray *readArray=[NSArray arrayWithContentsOfFile:arrayFile];
NSLog(@"%@",readArray);

//NSDictionary
NSDictionary *readDict=[NSDictionary dictionaryWithContentsOfFile:dictFile];
NSLog(@"%@",readDict);