Detailed approach to the management of cookies in IOS app development _ios

first, what is a cookie

Cookies are Web sites to be the terminal identity, stored in the terminal local user credentials information. The fields and meanings in the cookie are defined by the service side. For example, when a user logs on to a Web site, the server returns the cookie information to the terminal and the terminal saves the information, and the terminal sends the saved cookie message to the server the next time it visits the site. The server determines whether this user can log on automatically based on whether the cookie information is valid.

second, two classes of cookie management in iOS

The HTTP network request cookie Management in iOS is mainly handled by two classes, one class is Nshttpcookiestorage class and the other is Nshttpcookie class.

1.NSHTTPCookieStorage

The Nshttpcookiestorage class takes a single example of the design pattern, which manages cookie information for all HTTP requests, commonly used in the following ways:

Get a single Instance object
+ (Nshttpcookiestorage *) sharedhttpcookiestorage;
All cookie data arrays where Nshttpcookie objects are stored
@property (Nullable, ReadOnly, copy) Nsarray<nshttpcookie *> *cookies;
Manually set up a cookie data
-(void) Setcookie: (Nshttpcookie *) cookie;
Delete a cookie message
-(void) Deletecookie: (Nshttpcookie *) cookie;
Delete all cookie information after a time iOS8 available
-(Nullable Nsarray<nshttpcookie *> *) Cookiesforurl: (Nsurl *) URL;
Get all cookie data for a particular URL
-(void) Removecookiessincedate: (NSDate *) Date ns_available (10_10, 8_0);
Set a cookie for a specific URL
-(void) Setcookies: (Nsarray<nshttpcookie *> *) Cookies Forurl: (Nullable Nsurl *) URL Maindocumenturl: (Nullable Nsurl *) Maindocumenturl;
Receive protocol for cookie data
/*
Enumerated below:
typedef ns_enum (Nsuinteger, Nshttpcookieacceptpolicy) {
nshttpcookieacceptpolicyalways,//Receive all cookie information
nshttpcookieacceptpolicynever,//does not receive all cookie information
nshttpcookieacceptpolicyonlyfrommaindocumentdomain//only receive cookie information for the main document field
};
*/
@property Nshttpcookieacceptpolicy Cookieacceptpolicy;
The two notifications below the system are related to cookie management:

//Notification when receiving protocol of cookie data changes
FOUNDATION_EXPORT NSString * const NSHTTPCookieManagerAcceptPolicyChangedNotification;
//Notifications sent when managed cookie data changes
FOUNDATION_EXPORT NSString * const NSHTTPCookieManagerCookiesChangedNotification;

2.NSHTTPCookie

Nshttpcookie is a specific HTTP request cookie data object, where the property method is as follows:

The following two methods are used for object creation and initialization through the dictionary for key value setting
-(Nullable Instancetype) Initwithproperties: (nsdictionary<nsstring *, id> *) properties;
+ (Nullable Nshttpcookie *) Cookiewithproperties: (nsdictionary<nsstring *, id> *) properties;
Returns a dictionary in cookie data that can be used to add HTTP header fields
+ (nsdictionary<nsstring *, nsstring *> *) requestheaderfieldswithcookies: (Nsarray<nshttpcookie *> *) Cookies
Resolves the cookie data from the specified response header and URL address
+ (Nsarray<nshttpcookie *> *) Cookieswithresponseheaderfields: (nsdictionary<nsstring *, NSString *> *) Headerfields Forurl: (Nsurl *) URL;
Dictionary of properties in cookie data
@property (Nullable, ReadOnly, copy) nsdictionary<nsstring *, id> *properties;
The version of the request response
@property (readonly) Nsuinteger version;
Request the appropriate name
@property (readonly, copy) NSString *name;
Request the appropriate value
@property (readonly, copy) NSString *value;
Expiration time
@property (Nullable, ReadOnly, copy) NSDate *expiresdate;
The requested domain name
@property (readonly, copy) NSString *domain;
The path of the request
@property (readonly, copy) NSString *path;
Whether it is a secure transmission
@property (readonly, getter=issecure) BOOL secure;
Whether to send only HTTP services
@property (readonly, getter=ishttponly) BOOL HttpOnly;
The document for the response
@property (Nullable, ReadOnly, copy) NSString *comment;
The corresponding document URL
@property (Nullable, ReadOnly, copy) Nsurl *commenturl;
Service Port List
@property (Nullable, ReadOnly, copy) Nsarray<nsnumber *> *portlist;

Third, clear cookies
to clear all cookie methods:

NSURL *url = [NSURL URLWithString:@"http://www.baidu.com"]; 
    if (url) { 
        NSArray *cookies = [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookiesForURL:url]; 
        for (int i = 0; i < [cookies count]; i++) { 
            NSHTTPCookie *cookie = (NSHTTPCookie *)[cookies objectAtIndex:i]; 
            [[NSHTTPCookieStorage sharedHTTPCookieStorage] deleteCookie:cookie]; 
             
        }  
To clear a particular cookie method:
NSArray * cookArray = [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookiesForURL:[NSURL URLWithString:self.loadURL]]; NSString * successCode = @""; for (NSHTTPCookie*cookie in cookArray) { if ([cookie.name isEqualToString:@"cookiename"]) { [[NSHTTPCookieStorage sharedHTTPCookieStorage] deleteCookie:cookie]; } } 

To clear a URL cache method:
[[NSURLCache sharedURLCache] removeCachedResponseForRequest:[NSURLRequest requestWithURL:url]]; 

Clear all Caching methods:
[[NSURLCache sharedURLCache] removeAllCachedResponses];