iOS的Cookie存取（转）
当前一些公司为了快速出一款app，很多时候采用UINavigationController+WebView或者NavigationController+UITabbarVC+WebView的方式，这样就不可避免的需要使用cookie与HTML5交互，下面讲述几种常用情景下cookie的添加方法：
一. UIWebView：
// 工厂类中存储cookie的方法
+ (void)saveCookies {
// 创建一个可变字典存放cookie
NSMutableDictionary *fromappDict = [NSMutableDictionary dictionary];
[fromappDict setObject:@"fromapp" forKey:NSHTTPCookieName];
[fromappDict setObject:@"ios" forKey:NSHTTPCookieValue];
// kDomain是公司app网址
[fromappDict setObject:kDomain forKey:NSHTTPCookieDomain];
[fromappDict setObject:kDomain forKey:NSHTTPCookieOriginURL];
[fromappDict setObject:@"/" forKey:NSHTTPCookiePath];
[fromappDict setObject:@"0" forKey:NSHTTPCookieVersion];
// 将可变字典转化为cookie
NSHTTPCookie *cookie = [NSHTTPCookie cookieWithProperties:params];
// 获取cookieStorage
NSHTTPCookieStorage *cookieStorage = [NSHTTPCookieStorage sharedHTTPCookieStorage]
// 存储cookie
[cookieStorage setCookie:cookie];
}
UIWebView使用时间较长，只要在cookieStorage中设置了相应的cookie，每次就会自动带上；
但是这样的弊端是随着与H5的交互增加，Cookie占用的空间越来越大，每次交互都夹带大量的cookie，不仅增加服务器端压力，也浪费用户的流量。比如每次交互都夹带5kb的cookie内容，但是真正用到的只有两三百字节。
二. WKWebView
WKWebView相比于UIWebView：
速度快了一倍，内存却减少为原来的一半；
cookie不再是自动携带，需要手动设置；
交互更加顺畅，比如app底部四个tabBar也都是网页的，在UIWebView下点击，整个H5页面都会闪白一下，但是在WKWebView下点击，四个tabBar效果与原生app效果更加类似，不会有闪白现象。
增减了一些代理方法，更方便的进行协议拦截和进度条展示
1.在创建的时候存放到WKUserScript中进行添加cookie
WKWebViewConfiguration *webConfig = [[WKWebViewConfiguration alloc] init];
// 设置偏好设置
webConfig.preferences = [[WKPreferences alloc] init];
// 默认为0
webConfig.preferences.minimumFontSize = 10;
// 默认认为YES
webConfig.preferences.javaScriptEnabled = YES;
// 在iOS上默认为NO，表示不能自动通过窗口打开
webConfig.preferences.javaScriptCanOpenWindowsAutomatically = NO;
// web内容处理池
webConfig.processPool = [[WKProcessPool alloc] init];
// 将所有cookie以document.cookie = 'key=value';形式进行拼接
NSString *cookieValue = [@"document.cookie = 'fromapp=ios';document.cookie = 'channel=appstore';"];
// 加cookie给h5识别，表明在ios端打开该地址
WKUserContentController* userContentController = WKUserContentController.new;
WKUserScript * cookieScript = [[WKUserScript alloc]
initWithSource: cookieValue
injectionTime:WKUserScriptInjectionTimeAtDocumentStart forMainFrameOnly:NO];
[userContentController addUserScript:cookieScript];
webConfig.userContentController = userContentController;
WKWebView *wkWebView = [[WKWebView alloc] initWithFrame:frame configuration:webConfig];
wkWebView.UIDelegate = wkWebView;
wkWebView.navigationDelegate = wkWebView;
2.加载某个url的时候添加cookie
如果WKWebView在加载url的时候需要添加cookie，需要先手动获取当前NSHTTPCookieStorage中的所有cookie，然后将cookie放到NSMutableURLRequest请求头中
- (void)loadRequestWithUrlString:(NSString *)urlString {
// 在此处获取返回的cookie
NSMutableDictionary *cookieDic = [NSMutableDictionary dictionary];
NSMutableString *cookieValue = [NSMutableString stringWithFormat:@""];
NSHTTPCookieStorage *cookieJar = [NSHTTPCookieStorage sharedHTTPCookieStorage];
for (NSHTTPCookie *cookie in [cookieJar cookies]) {
[cookieDic setObject:cookie.value forKey:cookie.name];
}
// cookie重复，先放到字典进行去重，再进行拼接
for (NSString *key in cookieDic) {
NSString *appendString = [NSString stringWithFormat:@"%@=%@;", key, [cookieDic valueForKey:key]];
[cookieValue appendString:appendString];
}
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:urlString]];
[request addValue:cookieValue forHTTPHeaderField:@"Cookie"];
[self loadRequest:request];
}
3.AFNetworking
AFNetworking存取cookie就比较常见了，话不多说，都在代码里了
// 获取AFHTTPRequestOperationManager
AFHTTPRequestOperationManager *operationManager = [AFHTTPRequestOperationManager manager];
// 创建可变字典用于存放Cookie
NSMutableDictionary *cookieDic = [NSMutableDictionary dictionary];
// 存放新添加的cookie
NSMutableString *cookieValue = [NSMutableString stringWithFormat:@"fromapp=ios;"];
// 获取
NSHTTPCookieStorage *cookieJar = [NSHTTPCookieStorage sharedHTTPCookieStorage];
for (NSHTTPCookie *cookie in [cookieJar cookies]) {
[cookieDic setObject:cookie.value forKey:cookie.name];
}
// cookie重复，先放到字典去重，再进行拼接
for (NSString *key in cookieDic) {
NSString *appendString = [NSString stringWithFormat:@"%@=%@;", key, [cookieDic valueForKey:key]];
[cookieValue appendString:appendString];
}
// 将cookie存到请求头中
[operationManager.requestSerializer setValue:cookieValue forHTTPHeaderField:@"Cookie"];
// 拼接url地址
NSString *urlStr = [NSString stringWithFormat:@"%@%@", kHostIP, kPath];
// 设置参数字典
NSDictionary *paraDict = @{
@"key" : value
};
// 发送请求，处理结果
[operationManager POST:urlStr parameters:paraDict success:^(AFHTTPRequestOperation * _Nonnull operation, id _Nonnull responseObject) {
NSLog(@"responseObject-->%@", responseObject);
} failure:^(AFHTTPRequestOperation * _Nullable operation, NSError * _Nonnull error) {
NSLog(@"error-->%@", error);
}];
文／si1ence（简书作者）
原文链接：http://www.jianshu.com/p/d2c478bbcca5
著作权归作者所有，转载请联系作者获得授权，并标注“简书作者”。
