Basic operational summary of the iOS sandbox mechanism

Each iOS program has its own sandbox (sandbox), and iOS8 is available after the sandbox is partially open

We can access the folders under the sandbox

Folders include:

1,documents: Saving data that needs to be persisted when the app runs

2.tem: Save temporary data, system restart automatically disappears

3.library: Stored program default settings and other information

4.library/caches: Saving Temporary files

5.library/preferences: Save preferences configuration information, SQLite data

#import <Foundation/Foundation.h>

int main (int argc, const char * argv[]) {

@autoreleasepool {

Get root directory

NSString *dir=nshomedirectory ();

NSLog (@ "%@" dir);//mac under:/users/tang,ios is not this

Documents Path

First parameter: The name of the sandbox folder to get

Second parameter://nsuserdomainmask = 1,//User home directory Nslocaldomainmask = 2,//current Machine Nsnetworkdomainmask = 4,//visible Host in the network Nssystemdomainmask = 8,//system directory, non-modifiable (/system) Nsalldomainsmask = 0x0ffff,//all

Third parameter: yes/no whether to get the full path YES

nsarray* Arr=nssearchpathfordirectoriesindomains (nsdocumentdirectory, 1, YES);

NSLog (@ "%@", [arr objectatindex:0]);

Caches path

Arr=nssearchpathfordirectoriesindomains (nscachesdirectory,1, YES);

NSLog (@ "%@", [arr objectatindex:0]);

Library Path

Arr=nssearchpathfordirectoriesindomains (nslibrarydirectory, 1, YES);

NSLog (@ "%@", [arr objectatindex:0]);

TEM path

NSString *tem=nstemporarydirectory ();

To apply, create a file:

The Preferences folder under the library path cannot be accessed, only the stitching string

Arr=nssearchpathfordirectoriesindomains (nslibrarydirectory, 1, YES);

NSLog (@ "%@", [arr objectatindex:0]);

NSString *path1= [[arr objectatindex:0] stringbyappendingpathextension:@ "Preferences/1.txt"];

NSString *[email protected] "write files, record data";

[Data writetofile:path1 Atomically:yes encoding:nsutf8stringencoding Error:nil];

}

return 0;

}

Basic operational summary of the iOS sandbox mechanism