IOS中的数据存储 简单总结
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1. NSKeyedArchiver（加密形式）
2. plist
3. NSUserDefaults
4. writeToFile
5. SQLite3
==== NSKeyedArchiver ========================================
-------CKPerson.h 代码
@interface CKPerson : NSObject
@property (nonatomic, copy) NSString *name;
@property (nonatomic, assign) int age;
- (void)encodeWithCoder:(NSCoder *)aCoder;
- (id)initWithCoder:(NSCoder *)aDecoder;
@end
------- CKPerson.m 代码
- (void)encodeWithCoder:(NSCoder *)aCoder
{
[aCoder encodeObject:self.name forKey:@"name"];
[aCoder encodeInteger:self.age forKey:@"age"];
}
- (id)initWithCoder:(NSCoder *)aDecoder
{
if(self = [super init])
{
self.name = [aDecoder decodeObjectForKey:@"name"];
self.age = [aDecoder decodeIntegerForKey:@"age"];
}
return self;
}
---------- CKViewController.m
- (IBAction)OnSaveDataClick:(UIButton *)sender {
CKPerson *p = [[CKPerson alloc] init];
p.name = @"GoldenKey";
p.age = 21;
NSString *docPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
NSString *fileName = filePath = [docPath stringByAppendingPathComponent:@"student.hehe"];
[NSKeyedArchiver archiveRootObject:p toFile:filePath]; //保存数据
}
- (IBAction)OnGetDataClick:(UIButton *)sender {
CKPerson *p = [NSKeyedUnarchiver unarchiveObjectWithFile:filePath]; //获取数据
}
==== plist存取 array、dictionary ===================================
- (IBAction)OnArraySaveClick:(UIButton *)sender {
NSArray *testArray = @[@"111",@"121",@"131",@"141",@"151"];
[testArray writeToFile:self.path4Array atomically:YES];
}
- (IBAction)OnArrayGetClick:(UIButton *)sender {
NSArray *testArray = [NSArray arrayWithContentsOfFile:self.path4Array];
NSLog(@"数组长度为%d",[testArray count]);
}
- (IBAction)OnDictionarySaveClick:(UIButton *)sender {
NSDictionary *dict = @{@"name":@"key",@"age":@12};
[dict writeToFile:self.path4Dict atomically:YES];
}
- (IBAction)OnDictionaryGetClick:(UIButton *)sender {
NSDictionary *dict = [NSDictionary dictionaryWithContentsOfFile:self.path4Dict];
NSLog(@"name:%@",dict[@"name"]);
NSLog(@"age:%@",dict[@"age"]);
}
==== NSUserDefaults 程序票号设置 =================================
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setInteger:1 forKey:@"testInt"];
[userDefaults synchronize];
int i = [userDefaults integerForKey:@"testInt"];
NSLog(@"i=%d",i);
//-----------
NSString *name = @"GoldenKey";
[userDefaults setObject:name forKey:@"name"];
[userDefaults synchronize];
NSString *nameResult = [userDefaults objectForKey:@"name"];
NSLog(@"%@",nameResult);
==== writeToFile ============================================
--读取string----------------------------------------------------
NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask,YES);
NSString *ourDocumentPath =[documentPaths objectAtIndex:0];
//第二步：生成在该路径下的文件：
NSString *FileName=[ourDocumentPath stringByAppendingPathComponent:@"test.hehe"];
NSString *texts = @"test string";
NSData *data = [texts dataUsingEncoding:NSUTF8StringEncoding];
[data writeToFile:FileName atomically:YES];//将NSData类型对象data写入文件，文件名为FileName
//读取方式1
//NSData *dataResult=[NSData dataWithContentsOfFile:FileName options:0 error:NULL];//从FileName中读取出数据
//NSString *strResult = [[NSString alloc] initWithData:dataResult encoding:NSUTF8StringEncoding];
//读取方式2
NSString *strResult = [NSString stringWithContentsOfFile:FileName encoding:NSUTF8StringEncoding error:nil];
NSLog(@"%@",strResult);
//--存取dictionary-------------------------------------------
NSString *dictFileName = [ourDocumentPath stringByAppendingPathComponent:@"dict.hehe"];
NSDictionary *dictTest = @{@"name":@"GoldenKey",@"age":@24};
NSData *dictData = [NSJSONSerialization dataWithJSONObject:dictTest options:NSJSONWritingPrettyPrinted error:nil];
[dictData writeToFile:dictFileName atomically:YES];
NSData *dataResult = [NSData dataWithContentsOfFile:dictFileName];
NSDictionary *dictResult = [NSJSONSerialization JSONObjectWithData:dataResult options:NSJSONReadingMutableContainers error:nil];
NSLog(@"name = %@",dictResult[@"name"]);
==== sqlite3 ========================================================
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