沙盒根目錄：NSString *home = NSHomeDirectory();Documents：(2種方式)1. 利用沙盒根目錄拼接”Documents”字符串//不建議采用，因為新版本的操作系統(tǒng)可能會修改目錄名NSString *home = NSHomeDirectory();NSString *documents = [home stringByAppendingPathComponent:@"Documents"];2. 利用NSSearchPathForDirectoriesInDomains函數(shù)// NSUserDomainMask 代表從用戶文件夾下找// YES 代表展開路徑中的波浪字符“~”NSArray *array = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, NO);// 在iOS中，只有一個目錄跟傳入的參數(shù)匹配，所以這個集合里面只有一個元素NSString *documents = [array objectAtIndex:0];tmp：NSString *tmp = NSTemporaryDirectory();Library/Caches：跟Documents類似的2種方法:1. 利用沙盒根目錄拼接”Caches”字符串2. 利用NSSearchPathForDirectoriesInDomains函數(shù)(將函數(shù)的第2個參數(shù)改為：NSCachesDirectory即可)Library/Preference：通過NSUserDefaults類存取該目錄下的設(shè)置信息

/ /獲取路徑NSString *path = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0];path = [path stringByAppendingPathComponent:@"save.plist"];/ /將數(shù)據(jù)封裝成字典//不能存儲對象NSMutableDictionary *dict = [NSMutableDictionary dictionary];[dict setObject:@"小黃" forKey:@"name"];[dict setObject:@"12345678" forKey:@"phone"];[dict setObject:@"24" forKey:@"age"];// 將字典持久化到Documents/save.plist文件中[dict writeToFile:path atomically:YES];

讀取屬性列表，恢復(fù)NSDictionary對象// 讀取Documents/save.plist的內(nèi)容，實例化NSDictionaryNSDictionary *dict = [NSDictionary dictionaryWithContentsOfFile:path];NSLog(@"name:%@", [dict objectForKey:@"name"]);NSLog(@"phone:%@", [dict objectForKey:@"phone"]);NSLog(@"age:%@", [dict objectForKey:@"age"]);

//比如，保存用戶名、字體大小、是否自動登錄NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];[defaults setObject:@"mr.zk" forKey:@"username"];[defaults setFloat:18.0f forKey:@"text_size"];[defaults setBool:YES forKey:@"auto_login"];

//讀取上次保存的設(shè)置NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];NSString *username = [defaults stringForKey:@"username"];float textSize = [defaults floatForKey:@"text_size"];BOOL autoLogin = [defaults boolForKey:@"auto_login"];

NSString *path = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)[0];path = [path stringByAppendingPathComponent:@"array.data"];NSArray *array = [NSArray arrayWithObjects:@”a”,@”b”,nil];[NSKeyedArchiver archiveRootObject:array toFile:path];

NSArray *array = [NSKeyedUnarchiver unarchiveObjectWithFile:path];

NSKeyedArchiver-歸檔Person對象（Person.h）@interface Person : NSObject<NSCoding>@property (nonatomic, strong) NSString *name;@property (nonatomic, assign) int age;@property (nonatomic, assign) float height;@end

@implementation Person- (void)encodeWithCoder:(NSCoder *)encoder {  [encoder encodeObject:self.name forKey:@"name"];  [encoder encodeInt:self.age forKey:@"age"];  [encoder encodeFloat:self.height forKey:@"height"];}- (id)initWithCoder:(NSCoder *)decoder {  self.name = [decoder decodeObjectForKey:@"name"];  self.age = [decoder decodeIntForKey:@"age"];  self.height = [decoder decodeFloatForKey:@"height"];  return self;}@end

//歸檔(編碼)Person *person = [[[Person alloc] init] autorelease];person.name = @"zk";person.age = 24;person.height = 1.73f;[NSKeyedArchiver archiveRootObject:person toFile:path];//恢復(fù)(解碼)Person *person = [NSKeyedUnarchiver unarchiveObjectWithFile:path];

//歸檔（編碼）// 新建一塊可變數(shù)據(jù)區(qū)NSMutableData *data = [NSMutableData data];// 將數(shù)據(jù)區(qū)連接到一個NSKeyedArchiver對象NSKeyedArchiver *archiver = [[[NSKeyedArchiver alloc] initForWritingWithMutableData:data] autorelease];// 開始存檔對象，存檔的數(shù)據(jù)都會存儲到NSMutableData中[archiver encodeObject:person1 forKey:@"person1"];[archiver encodeObject:person2 forKey:@"person2"];// 存檔完畢(一定要調(diào)用這個方法)[archiver finishEncoding];// 將存檔的數(shù)據(jù)寫入文件[data writeToFile:path atomically:YES];

//恢復(fù)（解碼）// 從文件中讀取數(shù)據(jù)NSData *data = [NSData dataWithContentsOfFile:path];// 根據(jù)數(shù)據(jù)，解析成一個NSKeyedUnarchiver對象NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:data];Person *person1 = [unarchiver decodeObjectForKey:@"person1"];Person *person2 = [unarchiver decodeObjectForKey:@"person2"];// 恢復(fù)完畢[unarchiver finishDecoding];