//2.文件读写
//支持:NSString, NSArray , NSDictionay, NSData
//注:集合(NSArray, NSDictionay)中得元素也必须是这四种类型, 才能够进行文件读写
//string文件读写
NSString *string = @"假如给我有索纳塔";
//Document
NSString *docPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject];
//指定文件路径 aaa.txt
NSString *filePath = [docPath stringByAppendingPathComponent:@"aaa.txt"];
NSLog(@"**%@", filePath);
//写入文件
//参数1:文件路径, 如果文件路径下没有此文件, 系统会自动创建一个文件.
//参数2:是否使用辅助文件
//参数3:编码格式
//参数4:错误
NSError *error = nil;
BOOL result = [string writeToFile:filePath atomically:YES encoding:NSUTF8StringEncoding error:&error];
if (result) {
NSLog(@"写入成功");
} else {
NSLog(@"写入错误");
}
if (error) {
NSLog(@"出现错误");
}
//取值操作,
NSError *error1 = nil;
NSString *contenSring = [[NSString alloc] initWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:&error1];
if (error1) {
NSLog(@"error:%@", error1);
} else {
NSLog(@"文件内容%@", contenSring);
}
[contenSring release];
//NSArray的文件读写
NSArray *array = @[@"123", @"abc", @"apm"];
//写入操作, 格式XML
//Library, test.txt
//library路径
NSString *libraryPath1 = [NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES) firstObject];
//文件路径
NSString *textPath = [libraryPath1 stringByAppendingPathComponent:@"text.txt"];
NSLog(@"%@", textPath);
//写入
BOOL result4 = [array writeToFile:textPath atomically:YES];
//判断是否写入成功
if (result4) {
NSLog(@"写入成功");
} else {
NSLog(@"写入失败");
}
//取值操作
NSArray *bbb = [[NSArray alloc] initWithContentsOfFile:textPath];
NSLog(@"%@", bbb);
[bbb release];
//NSDictionary, 格式:XMl
NSDictionary *dic = @{@"a": @"aaa", @"1": @"111", @"*" :@"**"};
//Caches, dic.txt
//Caches文件路径
NSString *cachesPath1 = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)firstObject];
//dic.txt路径
NSString *dicPath = [cachesPath1 stringByAppendingPathComponent:@"dic.txt"];
NSLog(@"%@", dicPath);
//写入
BOOL result3 = [dic writeToFile:dicPath atomically:YES];
//判断写入是否成功
if (result3) {
NSLog(@"写入成功");
} else {
NSLog(@"写入shib");
}
//取值操作
NSDictionary *dict = [[NSDictionary alloc] initWithContentsOfFile:dicPath];
NSLog(@"%@", dict);
[dict release];
//NSData NSString *tmpPath = NSTemporaryDirectory();
NSString *string2 = @"132456789";
//字符串转data
NSData *data = [string2 dataUsingEncoding:NSUTF8StringEncoding];
//tmp路径
//tmp data.txt
NSString *tmpPath1 = NSTemporaryDirectory();
//data.txt路径
NSString *dataPath = [tmpPath1 stringByAppendingPathComponent:@"data.txt"];
//写入
BOOL result1 = [data writeToFile:dataPath atomically:YES];
//判断是否写入成功
if (result1) {
NSLog(@"写入成功");
} else {
NSLog(@"写入失败");
}
//取值
NSData *datat = [[NSData alloc] initWithContentsOfFile:dataPath];
NSString *dataSting = [[NSString alloc] initWithData:datat encoding:NSUTF8StringEncoding];
[datat release];
NSLog(@"%@", dataSting);
[dataSting release];
1 //3.归档 / 反归档
2 //归档的实质:把其他类型数据(比如:Person),先转化成NSData, 再写入文件
3 //能进行归档的对象, 必须遵守<NSCoding>
4
5 //归档
6 Person *person = [[[Person alloc] init] autorelease];
7 person.name = @"辉哥";
8 person.age = @"18";
9 person.gender = @"男";
10 //NSLog(@"%@", person);
11
12
13 //可变data
14 NSMutableData *mData = [[NSMutableData alloc] initWithCapacity:0];
15
16 //NSKeyedArchiver, 压缩工具, 继承于NSCoder,主要用于编码
17 NSKeyedArchiver *archiver= [[NSKeyedArchiver alloc] initForWritingWithMutableData:mData];
18 //把Person对象压到Data中
19 [archiver encodeObject:person forKey:@"girlFriend"];
20 //完成压缩
21 [archiver finishEncoding];
22 [archiver release];
23 NSLog(@"%@", mData);
24
25 //主目录中, person.txt
26 NSString *homePatha = NSHomeDirectory();
27 NSString *mDataPath = [homePatha stringByAppendingPathComponent:@"person.txt"];
28 NSLog(@"%@", mDataPath);
29 BOOL result = [mData writeToFile:mDataPath atomically:YES];
30 if (result) {
31 NSLog(@"写入成功");
32 } else {
33 NSLog(@"写入失败");
34 }
35 [mData release];
36
37 //反归档
38 NSData *contentData = [[NSData alloc] initWithContentsOfFile:mDataPath];
39 //NSKeyedUnarchiver解压工具, 继承于NSCoder
40 NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:contentData];
41 [contentData release];
42 //通过key找到person
43 Person *contentPerson = [unarchiver decodeObjectForKey:@"girlFriend"];
44 NSLog(@"gd%@", contentPerson);
45 [unarchiver release];
46
1
2 //数据持久化:数据永久的保存
3 //数据持久化的实质:把数据写入文件, 再把文件存到硬盘
4 //IOS沙盒机制:IOS系统为每个app生成一个文件夹(沙盒), 这个文件夹只允许当前的APP访问
5 //沙盒的主目录
6 //沙盒主目录的文件夹名字由 十六进制数 和 - 组成, 保证沙盒安全性
7 //NSHomeDirectory()
8 NSString *homePath = NSHomeDirectory();
9 NSLog(@"%@", homePath);
10
11 //Documents文件
12 //存放着一些比较重要的用户信息, 比如游戏的存档
13 //Documents中得文件会被备份 或者 存入iCloud 中, 所以存到documents中得文件不能过大, 如果过大, 会在应用审核过程中遭到拒审
14 //参数1:文件夹名称
15 //参数2:搜素域 优先级user>local>network>system
16 //参数3:相对路径或者绝对路径, yes 是绝对, no是相对
17 //因为相同文件名的文件可能有多个, 所以返回的是一个数组
18 NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
19 //NSLog(@"%@", paths);
20
21 NSString *docmentsPath = [paths firstObject];
22 //NSLog(@"%@", docmentsPath);
23
24 //Library,资源库 存放一些不太重要, 相对比较大得文件
25 NSString *libraryPath = [NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES) firstObject];
26 //NSLog(@"libraryPath:%@", libraryPath);
27 //Library/Caches, 缓存, 网页缓存, 图片缓存, 应用中得"清理缓存"功能, 就是清理这个文件夹下得内容
28 NSString *cachesPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) firstObject];
29 //NSLog(@"%@", cachesPath);
30 //LanunchImages, 由LaunchScreen.xib生成的启动图片
31
32
33 //Library/Preferences, 偏好设置, 存放用户对这个应用的设置或配置
34 //注:路径找不到,通过NSUserDefaults访问
35
36
37 //tmp, 临时文件, 存放下载的压缩包, 解压过后删除
38 NSString *tmpPath = NSTemporaryDirectory();
39 NSLog(@"%@", tmpPath);
40
41 // *.app, 包,用右键,显示包内容, 查看里面存放的文件
42 //IOS8.0以后, *.app单独存放到一个文件内
43 // *.app中这个文件,只能够访问,不能够修改(写入)
44 NSString *bundlePath = [[NSBundle mainBundle] bundlePath];
45 NSLog(@"***%@", bundlePath);
46
47
48 //NSFileManager文件管理工具, 主要用于添加, 移动, 修改, 拷贝文件, 继承于NSObject
49 //文件管理工具是个单例
50 NSFileManager *fm = [NSFileManager defaultManager];
51 //文件路径
52 NSString *hPath = [[fm URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] firstObject];
53 NSLog(@"hPath:%@", hPath);
54
55 //创建文件夹,
56 //在主目录中创建images文件夹
57 NSString *mainPath = NSHomeDirectory();
58 NSString *directoryPath = [mainPath stringByAppendingPathComponent:@"images"];
59 NSLog(@"%@", directoryPath);
60
61 NSError *error = nil;
62 //attributes设置文件夹的属性,读写,隐藏等等
63 //NSDictionary *attributes = @{NSFileAppendOnly: @YES};
64 BOOL result = [fm createDirectoryAtPath:directoryPath withIntermediateDirectories:YES attributes:nil error:&error];
65 if (result) {
66 NSLog(@"创建成功");
67 } else {
68
69 NSLog(@"创建失败");
70 }
71
72 //创建文件
73 //在Images文件夹中创建image.png
74 NSString *imagePath = [directoryPath stringByAppendingPathComponent:@"image.png"];
75 NSLog(@"%@", imagePath);
76
77 //找图片
78 NSString *meinvPath = [[NSBundle mainBundle] pathForResource:@"美女7" ofType:@"png"];
79 NSData *imageData = [NSData dataWithContentsOfFile:meinvPath];
80
81 //创建图片
82 BOOL result2 = [fm createFileAtPath:imagePath contents:imageData attributes:nil];
83 if (result2) {
84 NSLog(@"创建成功");
85 } else {
86 NSLog(@"创建失败");
87 }
88
89 //判断文件是否存在
90 if ([fm fileExistsAtPath:imagePath]) {
91 NSLog(@"存在");
92 //删除
93 NSError *error = nil;
94 BOOL result = [fm removeItemAtPath:imagePath error:&error];
95 if (result) {
96 NSLog(@"删除成功");
97 } else {
98 NSLog(@"删除失败%@", error);
99 }
100 }
101
102 NSString *path = NSHomeDirectory();
103 NSString *filePath = [path stringByAppendingPathComponent:@"aaa.txt"];
104 NSLog(@"1*%@", filePath);
105 NSString *filePath1 =[path stringByAppendingString:@".aaa.txt"];
106 NSLog(@"2*%@", filePath1);
107 NSString *filePath2 = [path stringByAppendingFormat:@"/baa.txt"];
108 NSLog(@"3*%@", filePath2);
109 NSString *filePath3 = [path stringByAppendingPathExtension:@"caaa.txt"];
110 NSLog(@"4*%@", filePath3);
111
112
113
114
115
116
117 //数据持久化的方式
118 //1. NSUserDefaults, 继承于NSObject, 单例设计模式, 内部存值用的KVC
119 NSInteger money = 100000;
120 money -= 99999;
121
122 //存数据, 存放到PreFerences文件夹内的*.plist文件中, 以字典的形式存储
123 NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
124
125 [userDefaults setInteger:1 forKey:@"myMoney"];
126 //同步操作, 让存入的数据写入文件
127 [userDefaults synchronize];
128
129
130 //取数据, key和存数据的key保持一致
131 NSUserDefaults *user = [NSUserDefaults standardUserDefaults];
132 NSInteger myMoney = [user integerForKey:@"myMoney"];
133 NSLog(@"%ld", myMoney);
134
135
136 NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
137 NSInteger mmoney = [defaults integerForKey:@"myLifeMoney"];
138 if (mmoney <= 10) {
139 NSLog(@"不能花了");
140 } else {
141 NSLog(@"花了10, 吃了俩");
142 mmoney -= 10;
143 [defaults setInteger:mmoney forKey:@"myLifeMoney"];
144 [defaults synchronize];
145 }
146
147
148 //NSUserDefaults, 支持的数据类型:array, dictionary, string, data, date, number, bool
149 //NSUserDefaults, 一般存一些数值, 不存大量的数据
150 //是不是第一次启动
151 NSUserDefaults *userDefault1 = [NSUserDefaults standardUserDefaults];
152 BOOL isFirst = [userDefault1 boolForKey:@"isFirst"];
153 if (isFirst == NO) {
154 NSLog(@"第一次启动");
155 [userDefault1 setBool:YES forKey:@"isFirst"];
156 } else {
157 NSLog(@"不是第一次启动");
158 }
Person.h 中实现NSCoding协议
#import <Foundation/Foundation.h> @interface Person : NSObject<NSCoding> @property (nonatomic , retain) NSString *name, *age, *gender; @end
Person.m 中实现的方法
1 #import "Person.h"
2
3 @implementation Person
4 - (void)dealloc
5 {
6 [_age release];
7 [_name release];
8 [_gender release];
9 [super dealloc];
10
11 }
12
13 - (NSString *)description
14 {
15 return [NSString stringWithFormat:@"name:%@, age:%@, gender:%@", _name, _age, _gender];
16 }
17
18 #pragma mark - NSCoding
19 - (void)encodeWithCoder:(NSCoder *)aCoder {
20 //编码
21 [aCoder encodeObject:self.name forKey:@"NAME"];
22 [aCoder encodeObject:self.age forKey:@"AGE"];
23 [aCoder encodeObject:self.gender forKey:@"GENDER"];
24 }
25 - (id)initWithCoder:(NSCoder *)aDecoder {
26 self = [super init];
27 if (self) {
28 //解码
29 self.name = [aDecoder decodeObjectForKey:@"NAME"];
30 self.age = [aDecoder decodeObjectForKey:@"AGE"];
31 self.gender = [aDecoder decodeObjectForKey:@"GENDER"];
32 }
33 return self;
34 }
35
36
37 @end
@interface Person : NSObject<NSCoding>
时间： 2024-10-12 03:10:41