當(dāng)前一些公司為了快速出一款app，很多時候采用UINavigationController+WebView或者NavigationController+UITabbarVC+WebView的方式，這樣就不可避免的需要使用cookie與HTML5交互，下面講述幾種常用情景下cookie的添加方法：
一. UIWebView：
// 工廠類中存儲cookie的方法
+ (void)saveCookies {
// 創(chuàng)建一個可變字典存放cookie
NSMutableDictionary *fromappDict = [NSMutableDictionary dictionary];
[fromappDict setObject:@"fromapp" forKey:NSHTTPCookieName];
[fromappDict setObject:@"ios" forKey:NSHTTPCookieValue];
// kDomain是公司app網(wǎng)址
[fromappDict setObject:kDomain forKey:NSHTTPCookieDomain];
[fromappDict setObject:kDomain forKey:NSHTTPCookieOriginURL];
[fromappDict setObject:@"/" forKey:NSHTTPCookiePath];
[fromappDict setObject:@"0" forKey:NSHTTPCookieVersion];
// 將可變字典轉(zhuǎn)化為cookie
NSHTTPCookie *cookie = [NSHTTPCookie cookieWithProperties:params];
// 獲取cookieStorage
NSHTTPCookieStorage *cookieStorage = [NSHTTPCookieStorage sharedHTTPCookieStorage]
// 存儲cookie
[cookieStorage setCookie:cookie];
}
UIWebView使用時間較長，只要在cookieStorage中設(shè)置了相應(yīng)的cookie，每次就會自動帶上；
但是這樣的弊端是隨著與H5的交互增加，Cookie占用的空間越來越大，每次交互都夾帶大量的cookie，不僅增加服務(wù)器端壓力，也浪費(fèi)用戶的流量。比如每次交互都夾帶5kb的cookie內(nèi)容，但是真正用到的只有兩三百字節(jié)。
二. WKWebView
WKWebView相比于UIWebView：
速度快了一倍，內(nèi)存卻減少為原來的一半；
cookie不再是自動攜帶，需要手動設(shè)置；
交互更加順暢，比如app底部四個tabBar也都是網(wǎng)頁的，在UIWebView下點(diǎn)擊，整個H5頁面都會閃白一下，但是在WKWebView下點(diǎn)擊，四個tabBar效果與原生app效果更加類似，不會有閃白現(xiàn)象。
增減了一些代理方法，更方便的進(jìn)行協(xié)議攔截和進(jìn)度條展示
1.在創(chuàng)建的時候存放到WKUserScript中進(jìn)行添加cookie
WKWebViewConfiguration *webConfig = [[WKWebViewConfiguration alloc] init];
// 設(shè)置偏好設(shè)置
webConfig.preferences = [[WKPreferences alloc] init];
// 默認(rèn)為0
webConfig.preferences.minimumFontSize = 10;
// 默認(rèn)認(rèn)為YES
webConfig.preferences.javaScriptEnabled = YES;
// 在iOS上默認(rèn)為NO，表示不能自動通過窗口打開
webConfig.preferences.javaScriptCanOpenWindowsAutomatically = NO;
// web內(nèi)容處理池
webConfig.processPool = [[WKProcessPool alloc] init];
// 將所有cookie以document.cookie = 'key=value';形式進(jìn)行拼接
NSString *cookieValue = [@"document.cookie = 'fromapp=ios';document.cookie = 'channel=appstore';"];
// 加cookie給h5識別，表明在ios端打開該地址
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.加載某個url的時候添加cookie
如果WKWebView在加載url的時候需要添加cookie，需要先手動獲取當(dāng)前NSHTTPCookieStorage中的所有cookie，然后將cookie放到NSMutableURLRequest請求頭中
- (void)loadRequestWithUrlString:(NSString *)urlString {
// 在此處獲取返回的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重復(fù)，先放到字典進(jìn)行去重，再進(jìn)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就比較常見了，話不多說，都在代碼里了
// 獲取AFHTTPRequestOperationManager
AFHTTPRequestOperationManager *operationManager = [AFHTTPRequestOperationManager manager];
// 創(chuàng)建可變字典用于存放Cookie
NSMutableDictionary *cookieDic = [NSMutableDictionary dictionary];
// 存放新添加的cookie
NSMutableString *cookieValue = [NSMutableString stringWithFormat:@"fromapp=ios;"];
// 獲取
NSHTTPCookieStorage *cookieJar = [NSHTTPCookieStorage sharedHTTPCookieStorage];
for (NSHTTPCookie *cookie in [cookieJar cookies]) {
[cookieDic setObject:cookie.value forKey:cookie.name];
}
// cookie重復(fù)，先放到字典去重，再進(jìn)行拼接
for (NSString *key in cookieDic) {
NSString *appendString = [NSString stringWithFormat:@"%@=%@;", key, [cookieDic valueForKey:key]];
[cookieValue appendString:appendString];
}
// 將cookie存到請求頭中
[operationManager.requestSerializer setValue:cookieValue forHTTPHeaderField:@"Cookie"];
//? 拼接url地址
NSString *urlStr = [NSString stringWithFormat:@"%@%@", kHostIP, kPath];
// 設(shè)置參數(shù)字典
NSDictionary *paraDict = @{
@"key" : value
};
// 發(fā)送請求，處理結(jié)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（簡書作者）
原文鏈接：http://www.lxweimin.com/p/d2c478bbcca5
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