iOS學(xué)習(xí)筆記（十七）

Rdxer館 2016-07-22

展開(kāi)全文

iOS的沙盒機(jī)制,，應(yīng)用只能訪問(wèn)自己應(yīng)用目錄下的文件,。iOS不像android,，沒(méi)有SD卡概念,，不能直接訪問(wèn)圖像,、視頻等內(nèi)容,。iOS應(yīng)用產(chǎn)生的內(nèi)容,，如圖像,、文件,、緩存內(nèi)容等都必須存儲(chǔ)在自己的沙盒內(nèi)。默認(rèn)情況下,，每個(gè)沙盒含有3個(gè)文件夾：Documents, Library 和 tmp,。Library包含Caches、Preferences目錄,。

上面的完整路徑為：用戶->資源庫(kù)->Application Support->iPhone Simulator->6.1->Aplications

Documents：蘋(píng)果建議將程序創(chuàng)建產(chǎn)生的文件以及應(yīng)用瀏覽產(chǎn)生的文件數(shù)據(jù)保存在該目錄下,，iTunes備份和恢復(fù)的時(shí)候會(huì)包括此目錄
Library：存儲(chǔ)程序的默認(rèn)設(shè)置或其它狀態(tài)信息；

Library/Caches：存放緩存文件,，保存應(yīng)用的持久化數(shù)據(jù),，用于應(yīng)用升級(jí)或者應(yīng)用關(guān)閉后的數(shù)據(jù)保存，不會(huì)被itunes同步,，所以為了減少同步的時(shí)間,，可以考慮將一些比較大的文件而又不需要備份的文件放到這個(gè)目錄下。

tmp：提供一個(gè)即時(shí)創(chuàng)建臨時(shí)文件的地方,，但不需要持久化,，在應(yīng)用關(guān)閉后，該目錄下的數(shù)據(jù)將刪除,，也可能系統(tǒng)在程序不運(yùn)行的時(shí)候清除,。

APP Sandbox

iOS怎么獲取沙盒路徑，怎么操作文件呢,？下面給出答案,。

獲取應(yīng)用沙盒根路徑：

[cpp] view plain copy

print?

-(void)dirHome{
NSString *dirHome=NSHomeDirectory();
NSLog(@"app_home: %@",dirHome);
}

獲取Documents目錄路徑：

[cpp] view plain copy

print?

//獲取Documents目錄
-(NSString *)dirDoc{
//[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSLog(@"app_home_doc: %@",documentsDirectory);
return documentsDirectory;
}

獲取Library目錄路徑：

[cpp] view plain copy

print?

//獲取Library目錄
-(void)dirLib{
//[NSHomeDirectory() stringByAppendingPathComponent:@"Library"];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);
NSString *libraryDirectory = [paths objectAtIndex:0];
NSLog(@"app_home_lib: %@",libraryDirectory);
}

獲取Cache目錄路徑：

[cpp] view plain copy

print?

//獲取Cache目錄
-(void)dirCache{
NSArray *cacPath = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
NSString *cachePath = [cacPath objectAtIndex:0];
NSLog(@"app_home_lib_cache: %@",cachePath);
}

獲取Tmp目錄路徑：

[cpp] view plain copy

print?

//獲取Tmp目錄
-(void)dirTmp{
//[NSHomeDirectory() stringByAppendingPathComponent:@"tmp"];
NSString *tmpDirectory = NSTemporaryDirectory();
NSLog(@"app_home_tmp: %@",tmpDirectory);
}

創(chuàng)建文件夾：

[cpp] view plain copy

print?

//創(chuàng)建文件夾
-(void *)createDir{
NSString *documentsPath =[self dirDoc];
NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *testDirectory = [documentsPath stringByAppendingPathComponent:@"test"];
// 創(chuàng)建目錄
BOOL res=[fileManager createDirectoryAtPath:testDirectory withIntermediateDirectories:YES attributes:nil error:nil];
if (res) {
NSLog(@"文件夾創(chuàng)建成功");
}else
NSLog(@"文件夾創(chuàng)建失敗");
}

創(chuàng)建文件

[cpp] view plain copy

print?

//創(chuàng)建文件
-(void *)createFile{
NSString *documentsPath =[self dirDoc];
NSString *testDirectory = [documentsPath stringByAppendingPathComponent:@"test"];
NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *testPath = [testDirectory stringByAppendingPathComponent:@"test.txt"];
BOOL res=[fileManager createFileAtPath:testPath contents:nil attributes:nil];
if (res) {
NSLog(@"文件創(chuàng)建成功: %@" ,testPath);
}else
NSLog(@"文件創(chuàng)建失敗");
}

寫(xiě)數(shù)據(jù)到文件：

[cpp] view plain copy

print?

//寫(xiě)文件
-(void)writeFile{
NSString *documentsPath =[self dirDoc];
NSString *testDirectory = [documentsPath stringByAppendingPathComponent:@"test"];
NSString *testPath = [testDirectory stringByAppendingPathComponent:@"test.txt"];
NSString *content=@"測(cè)試寫(xiě)入內(nèi)容！";
BOOL res=[content writeToFile:testPath atomically:YES encoding:NSUTF8StringEncoding error:nil];
if (res) {
NSLog(@"文件寫(xiě)入成功");
}else
NSLog(@"文件寫(xiě)入失敗");
}

讀文件數(shù)據(jù)：

[cpp] view plain copy

print?

//讀文件
-(void)readFile{
NSString *documentsPath =[self dirDoc];
NSString *testDirectory = [documentsPath stringByAppendingPathComponent:@"test"];
NSString *testPath = [testDirectory stringByAppendingPathComponent:@"test.txt"];
// NSData *data = [NSData dataWithContentsOfFile:testPath];
// NSLog(@"文件讀取成功: %@",[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]);
NSString *content=[NSString stringWithContentsOfFile:testPath encoding:NSUTF8StringEncoding error:nil];
NSLog(@"文件讀取成功: %@",content);
}

文件屬性：

[cpp] view plain copy

print?

//文件屬性
-(void)fileAttriutes{
NSString *documentsPath =[self dirDoc];
NSString *testDirectory = [documentsPath stringByAppendingPathComponent:@"test"];
NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *testPath = [testDirectory stringByAppendingPathComponent:@"test.txt"];
NSDictionary *fileAttributes = [fileManager attributesOfItemAtPath:testPath error:nil];
NSArray *keys;
id key, value;
keys = [fileAttributes allKeys];
int count = [keys count];
for (int i = 0; i < count; i++)
{
key = [keys objectAtIndex: i];
value = [fileAttributes objectForKey: key];
NSLog (@"Key: %@ for value: %@", key, value);
}
}

刪除文件：

[cpp] view plain copy

print?

//刪除文件
-(void)deleteFile{
NSString *documentsPath =[self dirDoc];
NSString *testDirectory = [documentsPath stringByAppendingPathComponent:@"test"];
NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *testPath = [testDirectory stringByAppendingPathComponent:@"test.txt"];
BOOL res=[fileManager removeItemAtPath:testPath error:nil];
if (res) {
NSLog(@"文件刪除成功");
}else
NSLog(@"文件刪除失敗");
NSLog(@"文件是否存在: %@",[fileManager isExecutableFileAtPath:testPath]?@"YES":@"NO");
}

/**

* @author 張興業(yè)

* http://blog.csdn.net/xyz_lmn

* iOS入門(mén)群：83702688

* android開(kāi)發(fā)進(jìn)階群：241395671

* 我的新浪微博：@張興業(yè)TBOW

* 我的郵箱：xy-zhang#163.com（#->@）

https://developer.apple.com/library/ios/#documentation/FileManagement/Conceptual/FileSystemProgrammingGUide/FileSystemOverview/FileSystemOverview.html#//apple_ref/doc/uid/TP40010672-CH2-SW2

本站是提供個(gè)人知識(shí)管理的網(wǎng)絡(luò)存儲(chǔ)空間,，所有內(nèi)容均由用戶發(fā)布,，不代表本站觀點(diǎn)。請(qǐng)注意甄別內(nèi)容中的聯(lián)系方式,、誘導(dǎo)購(gòu)買(mǎi)等信息,，謹(jǐn)防詐騙,。如發(fā)現(xiàn)有害或侵權(quán)內(nèi)容，請(qǐng)點(diǎn)擊一鍵舉報(bào),。

轉(zhuǎn)藏 分享

QQ空間 QQ好友新浪微博微信

獻(xiàn)花（0） +1

來(lái)自： Rdxer館 > 《ios》

舉報(bào)/認(rèn)領(lǐng)