1、plist文件
/**
描述：plist文件持久化，存一些小型的文件。
plist文件是将某些特定的类，通过**XML**文件的方式保存在目录中。
NSArray;//数组
NSMutableArray;//可变数组
NSDictionary;//字典
NSMutableDictionary;//可变字典
NSData;//二进制数据
NSMutableData;//可变二进制数据
NSString;//字符串
NSMutableString;//可变字符串
NSNumber;//基本数据
NSDate;//日期
*/
// 存储
[self writeToPlist];
// 取出
NSArray *result = [self readFromPlist];
NSLog(@"取出来的plist文件%@",result);
/**
读写文件-plist
*/
- (void)writeToPlist{
NSString *path = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES).firstObject;
NSString *fileName = [path stringByAppendingPathComponent:@"123.plist"];
NSArray *array = @[@"1234", @"tony", @"java"];
//序列化，把数组存入plist文件
[array writeToFile:fileName atomically:YES];
}
- (NSArray *)readFromPlist{
NSString *path = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES).firstObject;
NSString *fileName = [path stringByAppendingPathComponent:@"123.plist"];
//反序列化，把plist文件数据读取出来，转为数组
NSArray *result = [NSArray arrayWithContentsOfFile:fileName];
return result;
}
2、NSUserDefaults
/**
描述：NSUserDefaults
如果没有调用synchronize方法，系统会根据I/O情况不定时刻地保存到文件中。所以如果需要立即写入文件的就必须调用synchronize方法。
偏好设置会将所有数据保存到同一个文件中，使用同一个key进行存储数据，会覆盖之前存储的数据。
存的都是不可变的。
*/
//1.获得NSUserDefaults文件
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
//2.向偏好设置中写入内容
[userDefaults setObject:@"AAA" forKey:@"a"];
[userDefaults setBool:YES forKey:@"sex"];
[userDefaults setInteger:21 forKey:@"age"];
//2.1立即同步
[userDefaults synchronize];
//3.读取偏好设置
NSString *name = [userDefaults objectForKey:@"a"];
BOOL sex = [userDefaults boolForKey:@"sex"];
NSInteger age = [userDefaults integerForKey:@"age"];
NSLog(@"NSUserDefaults读取数据：%@, %d, %ld", name, sex, age);
3、归档与反归档
创建model对象：
Person.h
#import// `encodeWithCoder`：用来说明如何将对象编码到归档中。 `initWithCoder`：用来说明如何进行解档来获取一个新对象。@interface Person : NSObject//2.设置属性
@property (strong, nonatomic) NSString *name;
@property (strong, nonatomic) NSString *passWord;
+ (Person *)userWithName:(NSString *)name password:(NSString *)password;
Person.m
+ (Person *)userWithName:(NSString *)name password:(NSString *)password
{
Person *user = [[Person alloc]init];
user.name = name;
user.passWord = password;
return user;
}
//归档
- (void)encodeWithCoder:(NSCoder *)aCoder {
[aCoder encodeObject:self.name forKey:@"name"];
[aCoder encodeObject:self.passWord forKey:@"passWord"];
}
//解档
- (id)initWithCoder:(NSCoder *)aDecoder{
if (self = [super init]) {
self.name = [aDecoder decodeObjectForKey:@"name"];
self.passWord = [aDecoder decodeObjectForKey:@"passWord"];
}
return self;
}
/**
描述：归档反归档
*/
// 归档
NSString *path = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES).firstObject;
NSString *file = [path stringByAppendingPathComponent:@"person.data"];
Person *person = [Person userWithName:@"xiaowang" password:@"110"];
Person *person1 = [Person userWithName:@"xiaozhang" password:@"119"];
NSMutableArray *personsArr = [NSMutableArray arrayWithObjects:person, person1, nil];
// model数组存储
[NSKeyedArchiver archiveRootObject:personsArr toFile:file];
// 解档
NSString *pathResult = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES).firstObject;
NSString *fileResult = [pathResult stringByAppendingPathComponent:@"person.data"];
NSMutableArray *array = [NSKeyedUnarchiver unarchiveObjectWithFile:fileResult];
for (Person *per in array) {
if (per) {
NSLog(@"归档反归档：%@\n%@",per.name,per.passWord);
}
}