Save and retrieve strings

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Sometimes , Some things need to be stored on the phone , For example , stay APP Storage and use time considerations password what

Several examples of methods need to be written

stay .h Write the French name above in the document

+ (void) saveCenterProValue:(NSString*)valueStr key:(NSString *)keyStr;

+ (id)getCenterPro:(NSString*)identifier;

stay .m Add the implementation method to the file

ps： It is better to write in a single example

+ (void) saveCenterProValue:(NSString*)valueStr key:(NSString *)keyStr{

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

[defaults setObject:valueStr forKey:keyStr];

[defaults synchronize];

}

+ (id)getCenterPro:(NSString*)identifier{

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

return [defaults objectForKey:identifier];

}

Okay , That's it

Next . How to use this method

1. Use a macro to define

#define UserPass @“UserPass” // user password

#define UserID @“UserID” // user ID

2. Save a string

[Common saveCenterProValue:@”123456″ key:UserPass];

[Common saveCenterProValue:@”001″ key:UserID];

3. Get this string

Common getCenterPro:UserPass];

Common getCenterPro:UserID];

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