[Objective-C] 012_数据持久化_XML属性列表，NSUserDefaults

在日常开发中经常要对NSString、NSDictionary、NSArray、NSData、NSNumber这些基本类的数据进行持久化，我们可以用XML属性列表持久化到.plist 文件中，也可以用NSUserDefaults，下面我们就开搞吧。

XML属性列表方式：

#import "AppDelegate.h"

#import "Person.h"



@interface AppDelegate ()



@end



@implementation AppDelegate



- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {



    NSDictionary *studentDic = [NSDictionary dictionaryWithObjectsAndKeys:@"SuperDo.Mount",@"student_mount",@"SuperDo.AC",@"student_ac",@"SuperDo.Horse",@"student_horse", nil];

    

    //获得Document的路径

    NSString *documents = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];

    NSString *path = [documents stringByAppendingPathComponent:@"students.plist"];

    

    //保存到Document目录下

    if([studentDic writeToFile:path atomically:YES]) {

        NSLog(@"Save to file success!");

    }

    

    //从path初始化

    NSDictionary *students = [NSDictionary dictionaryWithContentsOfFile:path];

    for (NSString *key in students.allKeys) {

        NSLog(@"%@: %@",key,[students objectForKey:key]);

    }

    

    return YES;

}



@end

保存到Documet下文件信息：

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">

<plist version="1.0">

<dict>

	<key>student_ac</key>

	<string>SuperDo.AC</string>

	<key>student_horse</key>

	<string>SuperDo.Horse</string>

	<key>student_mount</key>

	<string>SuperDo.Mount</string>

</dict>

</plist>

 

NSUserDefaults 方式:

#import "AppDelegate.h"

#import "Person.h"



@interface AppDelegate ()



@end



@implementation AppDelegate



- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {



    NSDictionary *studentDic = [NSDictionary dictionaryWithObjectsAndKeys:@"SuperDo.Mount",@"student_mount",@"SuperDo.AC",@"student_ac",@"SuperDo.Horse",@"student_horse", nil];

    

    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];

    [userDefaults setObject:studentDic forKey:@"students"];

    

    NSDictionary *dic = [userDefaults objectForKey:@"students"];

    for (NSString *key in dic.allKeys) {

        NSLog(@"NSUserDefaults 方式 ---- 》 %@: %@",key,[dic objectForKey:key]);

    }

    

    return YES;

}



@end

 

XML属性列表方式打印结果：

2015-07-06 20:39:53.623 Attendance[1129:68434] Save to file success!

2015-07-06 20:39:53.624 Attendance[1129:68434] student_ac: SuperDo.AC

2015-07-06 20:39:53.624 Attendance[1129:68434] student_mount: SuperDo.Mount

2015-07-06 20:39:53.624 Attendance[1129:68434] student_horse: SuperDo.Horse

 

NSUserDefault方式打印结果：

2015-07-06 20:50:44.743 Attendance[1155:70007] NSUserDefaults 方式 ---- 》 student_mount: SuperDo.Mount

2015-07-06 20:50:44.743 Attendance[1155:70007] NSUserDefaults 方式 ---- 》 student_ac: SuperDo.AC

2015-07-06 20:50:44.743 Attendance[1155:70007] NSUserDefaults 方式 ---- 》 student_horse: SuperDo.Horse

 

 

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转载自【宝宝巴士SuperDo团队】 原文链接: http://www.cnblogs.com/superdo/p/4625366.html