Essentials Summary of how iOS app data is stored

1. What can be done plist storage

1.writeToFile (Must have this method)

Dictionary and array can;

String: Although it is possible to do plist, the plist itself does not support strings.

2. The path must be expanded (when searching for a path (the third parameter must be YES)

If the no system will replace the sandbox path of your app with (~).

3. Note: Custom objects cannot be plist stored.

Preferred settings:

1. No need to care about file names

2. Fast storage of key-value pairs

3. The bottom layer is the encapsulation of UD as a dictionary

Remember to sync!!! before 4.ios8

Custom object archive/solve file:

1. If you want to store custom objects, you must use the archive/file operation

2.plist. Preference settings are not good enough to make

3. Be sure to follow the <NSCoding> protocol when customizing the object File/solution

4. When to call Initwithcoder as long as the parse file will be called

5. Remember to assign a value to a property when the properties of the file are being extracted!!!!

6. Why comply with <NSCoding> agreement?

What properties to tell the system to file/unpack

Tell the system how to archive the file

7. The suffix name of the file that holds the data can be named arbitrarily.

8. data saved through Plist is displayed directly and is not secure. The data saved by the archive method is garbled and more secure when it is opened in a file.

Get path:       

1. Get the Sandbox directory path function:
NSString *homedire = Nshomedirectory ();

2. How to obtain the Documents directory path:
Nsarray *paths = Nssearchpathfordirectoriesindomains (Nsdocumentdirectory,nsuserdomainmask,yes);
NSString *docdire = [Paths objectatindex:0];

3. How to get the caches directory path:
Nsarray *paths = Nssearchpathfordirectoriesindomains (Nscachesdirectory,nsuserdomainmask,yes);
NSString *cachesdire = [Paths objectatindex:0];

4. How to obtain the TMP directory path:

NSString *tmpdire = Nstemporarydirectory ();

Essentials Summary of how iOS app data is stored