iOS开发-plist文件增删改查
plist第一次看到这个后缀名文件的时候感觉怪怪的，不过接触久了也就习以为常了,plist是Property List的简称可以理解成属性列表文件，主要用来存储串行化后的对象的文件。扩展名为.plist,因此被称为 plist文件,xCode中默认的是一种树状的结构展现出来数据，可视化的动态增删改查，非常人性化，不过最终的结果是以XML形式存储的,Plist文件可以用于存储用户的一些设置信息，具体根据需求而定。
简单创建文件
简单创建文件就是说可以直接从xCode创建，右击项目new File，可以添加一个plist文件:
创建一个UserData.plist文件，之后的内容如下:
右击open as->source code，代码如下:
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<?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>Login</key>
<dict>
<key>UserName</key>
<string>FlyElephant</string>
<key>UserPassWord</key>
<string>123456</string>
</dict>
</dict>
</plist>
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读取设置的信息:
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//读取Property List文件
NSString
*userDataPath = [[
NSBundle
mainBundle] pathForResource:@
"UserData"
ofType:@
"plist"
];
NSMutableDictionary
*data = [[
NSMutableDictionary
alloc] initWithContentsOfFile:userDataPath];
NSLog
(@
"%@"
,data);
NSLog
(@
"用户名:%@ 密码:%@"
, data[@
"Login"
][@
"UserName"
],data[@
"Login"
][@
"UserPassWord"
]);
[data setObject:@
"登录信息"
forKey:@
"Login"
];
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增删改查
文件添加，上面是应用程序中添加文件，这个时候可以选择代码在沙盒中添加，代码如下:
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NSArray
*sandboxpath=
NSSearchPathForDirectoriesInDomains
(
NSDocumentDirectory
,
NSUserDomainMask
,
YES
);
//获取完整路径
NSString
*documentsDirectory = [sandboxpath objectAtIndex:0];
NSString
*plistPath = [documentsDirectory stringByAppendingPathComponent:@
"sandbox.plist"
];
//存储根数据
NSMutableDictionary
*rootDic = [[
NSMutableDictionary
alloc ] init];
//字典中的详细数据
NSMutableDictionary
*userDataDic = [[
NSMutableDictionary
alloc]init];
[userDataDic setObject:@
"Flephant"
forKey:@
"UserName"
];
[userDataDic setObject:@
"http://www.cnblogs.com/xiaofeixiang/"
forKey:@
"UserPassWord"
];
[rootDic setObject:userDataDic forKey:@
"Login"
];
//写入文件
[rootDic writeToFile:plistPath atomically:
YES
];
NSLog
(@
"%@"
,
NSHomeDirectory
());
NSLog
(@
"写入成功"
);
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路径如下，具体路径获取上一篇文章已经可以看到:
读取数据:
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//获取路径
NSArray
*sandboxpath=
NSSearchPathForDirectoriesInDomains
(
NSDocumentDirectory
,
NSUserDomainMask
,
YES
);
NSString
*filePath = [[sandboxpath objectAtIndex:0] stringByAppendingPathComponent:@
"sandbox.plist"
];
NSLog
(@
"%@"
,
NSHomeDirectory
());
//获取数据
NSMutableDictionary
*searchdata = [[
NSMutableDictionary
alloc] initWithContentsOfFile:filePath];
NSLog
(@
"%@"
,searchdata);
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修改文件:
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//获取路径
NSString
*filepath = [[
NSSearchPathForDirectoriesInDomains
(
NSDocumentDirectory
,
NSUserDomainMask
,
YES
)objectAtIndex:0]stringByAppendingPathComponent:@
"sandbox.plist"
];
//所有的数据列表
NSMutableDictionary
*datalist= [[[
NSMutableDictionary
alloc]initWithContentsOfFile:filepath]mutableCopy];
//获取Login节点
NSMutableDictionary
*loginData = [datalist objectForKey:@
"Login"
];
[loginData setValue: @
"FlyElephant"
forKey:@
"UserName"
];
[loginData setValue: @
"123456"
forKey:@
"UserPassWord"
];
[datalist setValue:loginData forKey:@
"Login"
];
[datalist writeToFile:filepath atomically:
YES
];
NSLog
(@
"修改成功"
);
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删除文件:
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NSFileManager
*manager=[
NSFileManager
defaultManager];
//文件路径
NSString
*filepath = [[
NSSearchPathForDirectoriesInDomains
(
NSDocumentDirectory
,
NSUserDomainMask
,
YES
)objectAtIndex:0]stringByAppendingPathComponent:@
"sandbox.plist"
];
if
([manager removeItemAtPath:filepath error:
nil
]) {
NSLog
(@
"文件删除成功"
);
}
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本文转自Fly_Elephant博客园博客，原文链接：http://www.cnblogs.com/xiaofeixiang/p/4263498.html，如需转载请自行联系原作者
