数据持久化(一)-----归档读写文件路径

<pre>- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]autorelease];
// Override point for customization after application launch.
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];

/*HMTRootViewController * rootVC = [[HMTRootViewController alloc]init];
self.window.rootViewController = rootVC;
[rootVC release];*/

// 1.获取沙盒文件的主路径
NSLog(@"home = %@",NSHomeDirectory());

// 2.获取Documents的路径(获取Library的路径类似)
NSLog(@"documents = %@", [NSHomeDirectory() stringByAppendingString:@"/Documents"]);
NSLog(@"documents = %@", [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"]);
NSLog(@"documents = %@",[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject]);

// 3.获取tmp的路径(单独的方法,与众不同)
NSLog(@"tmp = %@",NSTemporaryDirectory());

// 4.应用程序包.app-----只有读取的权利,没有修改的权利
NSLog(@".app = %@",[[NSBundle mainBundle] bundlePath]);
NSLog(@"resource = %@",[[NSBundle mainBundle]resourcePath]);
NSLog(@".exec = %@",[[NSBundle mainBundle] executablePath]);

//[self simpleOperationOfApp];
[self complexOperationOfApp];
[self complexArrayOperationOfApp];

return YES;

}

pragma mark - 简单的数据文件write/read

(void)simpleOperationOfApp{

pragma mark 字符串---txt

// 1.获取存储文件的上一级路径
NSString * documentsPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];

// 2.拼接一个完整的文件存储路径
NSString * filePath = [documentsPath stringByAppendingPathComponent:@"text.txt"];

// 3.write数据
NSString * saveString = @"我叫胡明涛";
[saveString writeToFile:filePath atomically:YES encoding:NSUTF8StringEncoding error:nil];

// 4.从文件中read
NSString * readString = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:nil];
NSLog(@"%@",readString);

pragma mark 数组---plist

NSString * cachesPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
NSString * arrayFilePath = [cachesPath stringByAppendingPathComponent:@"names.plist"];
NSArray * writeArray = @[@"吴凯",@"许珍珍",@"左友东"];
[writeArray writeToFile:arrayFilePath atomically:YES];

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

pragma mark 字典---plist

NSString * tmpPath = NSTemporaryDirectory();
NSString * dicFilePath = [tmpPath stringByAppendingPathComponent:@"dic.plist"];
NSDictionary * writeDic = @{@"name": @"HMT",@"sex":@"female"};
[writeDic writeToFile:dicFilePath atomically:YES];

NSDictionary * readDic = [NSDictionary dictionaryWithContentsOfFile:dicFilePath];
NSLog(@"%@",readDic);

// 修改数据
[readDic setValue:@"humingtao" forKey:@"name"];
[readDic writeToFile:dicFilePath atomically:YES];
NSLog(@"%@",readDic);

pragma mark NSData

// 获取图片对象
UIImage * writeImage = [UIImage imageNamed:@"OJ2NMBNXQ1G5_20121120051201760"];

// 图片对象转变为NSData类型
NSData * writeData = UIImagePNGRepresentation(writeImage);

NSString * imageFilePath = [documentsPath stringByAppendingPathComponent:@"美女.png"];
[writeData writeToFile:imageFilePath atomically:YES];

NSData * readData = [NSData dataWithContentsOfFile:imageFilePath];
// imageNamed------图片会存入缓存,下次加载很迅速,但是耗内存,图片一大就嗝屁了
UIImage * readImage = [UIImage imageWithData:readData];
// 从文件路径中找,调用一次就重新加载一次,只是显示图片,不加载到内存(后缀名不要加".")
[UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"美女" ofType:@"png"]];
NSLog(@"%@",readImage);
NSLog(@"%@",[UIImage imageWithContentsOfFile:imageFilePath]);

}

pragma mark - 单个--复杂的数据对象write/read-------NSCoding协议

(void)complexOperationOfApp{

UIButton * archiver = [UIButton buttonWithType:UIButtonTypeSystem];
archiver.frame = CGRectMake(20, 100, 100, 40);
[archiver setTitle:@"归档(序列化)" forState:UIControlStateNormal];
[archiver addTarget:self action:@selector(onClickArchiverButton:) forControlEvents:UIControlEventTouchUpInside];
[self.window addSubview:archiver];

UIButton * unArchiver = [UIButton buttonWithType:UIButtonTypeSystem];
unArchiver.frame = CGRectMake(160, 100, 120, 40);
[unArchiver setTitle:@"反归档(反序列化)" forState:UIControlStateNormal];
[unArchiver addTarget:self action:@selector(onClickUnArchiverButton:) forControlEvents:UIControlEventTouchUpInside];
[self.window addSubview:unArchiver];
}

pragma mark 对复杂的数据对象进行写入操作.原理:复杂的数据对象序列化为NSData,将NSData写入文件,实现数据持久化

(void)onClickArchiverButton:(UIButton *)button{

/**
- 1.自定义复杂的数据类型,例如ABPerson
- (1)ABPerson必须实现NSCoding协议的方法
- (2)ABPerson中的实例变量或属性,也必须实现NSCoding协议的方法
- (3)ABPerson中的基本数据类型没有过多限制
- 2.创建一个序列化工具对象
- 3.先找路径
- 4.对复杂的数据类型对象进行序列化
- 5.结束 finishEncoding
- 6.NSData写入
  */
  HMTABPerson * person = [[HMTABPerson alloc]init];
  person.name = @"HMT";
  person.age = 25;
NSMutableData * archiverData = [NSMutableData data];
NSKeyedArchiver * archiver = [[NSKeyedArchiver alloc]initForWritingWithMutableData:archiverData];

[archiver encodeObject:person forKey:@"PersonKey"];

[archiver finishEncoding];

NSString * documents = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject];
NSString * filePath = [documents stringByAppendingPathComponent:@"person.data"];

[archiverData writeToFile:filePath atomically:YES];

[person release];
[archiver release];

}

pragma mark 从文件中读取数据来实例化复杂对象数据操作

(void)onClickUnArchiverButton:(UIButton *)button{

/**
- 1.先找路径
- 2.NSData读出
- 3.创建一个反序列化工具
- 4.反序列化
- 5.结束 finishDecoding
- 6.操作对象了
  */
  NSString * documents = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject];
  NSString * filePath = [documents stringByAppendingPathComponent:@"person.data"];
NSData * unarchiverData = [NSData dataWithContentsOfFile:filePath];

NSKeyedUnarchiver * unarchiver = [[NSKeyedUnarchiver alloc]initForReadingWithData:unarchiverData];

HMTABPerson * person = [unarchiver decodeObjectForKey:@"PersonKey"];

[unarchiver finishDecoding];

NSLog(@"%@",person.name);

[unarchiver release];

}

pragma mark - 数组--复杂的数据对象write/read-------NSCoding协议

(void)complexArrayOperationOfApp{

UIButton * archiver = [UIButton buttonWithType:UIButtonTypeSystem];
archiver.frame = CGRectMake(20, 200, 100, 40);
[archiver setTitle:@"归档(序列化)" forState:UIControlStateNormal];
[archiver addTarget:self action:@selector(onClickArchiverArrayButton) forControlEvents:UIControlEventTouchUpInside];
[self.window addSubview:archiver];

UIButton * unArchiver = [UIButton buttonWithType:UIButtonTypeSystem];
unArchiver.frame = CGRectMake(160, 200, 120, 40);
[unArchiver setTitle:@"反归档(反序列化)" forState:UIControlStateNormal];
[unArchiver addTarget:self action:@selector(onClickUnArchiverArrayButton) forControlEvents:UIControlEventTouchUpInside];
[self.window addSubview:unArchiver];

}

pragma mark 写入

(void)onClickArchiverArrayButton{

NSMutableData * archiverData = [NSMutableData data];
NSKeyedArchiver * archiver = [[NSKeyedArchiver alloc]initForWritingWithMutableData:archiverData];

HMTABPerson * person1 = [[HMTABPerson alloc]init];
person1.name = @"陈凤长";
person1.age = 24;

HMTABPerson * person2 = [[HMTABPerson alloc]init];
person2.name = @"胡明涛";
person2.age = 24;

NSArray * personArray = @[person1,person2];

[archiver encodeObject:personArray forKey:@"PersonArrayKey"];

[archiver finishEncoding];

NSString * tmpPath = NSTemporaryDirectory();
NSString * filePath = [tmpPath stringByAppendingPathComponent:@"personArray.plist"];

[archiverData writeToFile:filePath atomically:YES];

[person1 release];
[person2 release];
[archiver release];

}

pragma mark 读取

(void)onClickUnArchiverArrayButton{

NSString * tmpPath = NSTemporaryDirectory();
NSString * filePath = [tmpPath stringByAppendingPathComponent:@"personArray.plist"];

NSData * unarchiverData = [NSData dataWithContentsOfFile:filePath];

NSKeyedUnarchiver * unarchiver = [[NSKeyedUnarchiver alloc]initForReadingWithData:unarchiverData];

NSArray * personArray = [unarchiver decodeObjectForKey:@"PersonArrayKey"];

[unarchiver finishDecoding];

HMTABPerson * person1 = [personArray objectAtIndex:0];
HMTABPerson * person2 = [personArray objectAtIndex:1];

NSLog(@"%@ %@",person1.name,person2.name);

[unarchiver release];

}
HMTABPerson.h

import <Foundation/Foundation.h>

@interface HMTABPerson : NSObject <NSCoding>

@property (nonatomic,assign)int age;
@property (nonatomic,copy) NSString * name;

@end
HMTABPerson.m

import "HMTABPerson.h"

@implementation HMTABPerson

(void)dealloc{

[_name release];
[super dealloc];
}

// 序列化,编码

(void)encodeWithCoder:(NSCoder *)aCoder{

[aCoder encodeObject:_name forKey:@"NameKey"];
[aCoder encodeInt:_age forKey:@"AgeKey"];

}

// 反序列化,解码

(id)initWithCoder:(NSCoder *)aDecoder{

if (self = [super init]) {

  self.name = [aDecoder decodeObjectForKey:@"NameKey"];
  self.age  = [aDecoder decodeIntForKey:@"AgeKey"];

}

return self;
}

@end</pre>

最后编辑于：2017.12.08 04:49:52

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数据持久化(一)-----归档 读写 文件路径