iOS webview与Js的交互。以及修改cookie、header头

昨天写了swift和JS的交互，既然写了就把OC的也写了出来：

第一部分：webview与Js的交互
第二部分：设定cookie
第三部分：修改header头
一：交互

#import "webView.h"#import <JavaScriptCore/JavaScriptCore.h>//系统支持库@protocol JSObjcDelegate <JSExport>//定义web与JS交互的协议-(void)goToNextActivity:(NSString *)urlStr;//JS需要调用的方法，参数可有可无，根据需要设定@end@interface webView ()<UIWebViewDelegate,JSObjcDelegate>//遵守协议@property (nonatomic,strong)JSContext * jsContext;//创建JSContext对象 我把它当作上下文对象，用于连接JS和OC@end@implementation webView-(instancetype)initWithFrame:(CGRect)frame url:(NSURL *)url{    self = [super initWithFrame:frame];    if (self) {        NSURLRequest *request = [NSURLRequest requestWithURL:url];        self.delegate = self;        [self loadRequest:request];    }    return self;}-(void)webViewDidFinishLoad:(UIWebView *)webView{    self.jsContext = [webView valueForKeyPath:@"documentView.webView.mainFrame.javaScriptContext"];    self.jsContext[@"myObj"] = self;//这里把self赋值给self.jsContext的myObj对象，那么在JS中就可以通过myObj调用oc方法了    self.jsContext.exceptionHandler = ^(JSContext *context, JSValue *exceptionValue) {        context.exception = exceptionValue;        NSLog(@"异常信息：%@", exceptionValue);    };}//webview调用方法-(void)goToNextActivity:(NSString *)urlStr{    NSLog(@"goToNextActivity str:%@",urlStr);}@end

二：cookie
这里是每次请求的时候都进行设定，所以方法写在了web开始加载的方法里面

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{    NSDictionary *dic = @{@"TOKEN":[DEFAULTS objectForKey:@"token"],@"UID":[DEFAULTS objectForKey:@"userID"]};    [dic enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {        // 设定 cookie        NSHTTPCookie *cookie = [NSHTTPCookie cookieWithProperties:                                [NSDictionary dictionaryWithObjectsAndKeys:                                 [request.URL host], NSHTTPCookieDomain,                                 [request.URL path], NSHTTPCookiePath,                                 key,NSHTTPCookieName,                                 obj,NSHTTPCookieValue,                                 nil]];        [[NSHTTPCookieStorage sharedHTTPCookieStorage] setCookie:cookie];//        NSLog(@"cookie = %@",cookie);    }];    return YES;}

三：header：
同样是写在了webview开始加载的方法里面

-(BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{    NSMutableURLRequest *mutableRequest = [request mutableCopy];//这里加了一些判断，避免死循环，因为修改完成后webview需要重新加载request （其中DEFAULTS 是NSUserDefaults存了一些后台程序返回的内容）    if (!request.allHTTPHeaderFields[@"CITY"]) {        [mutableRequest addValue:[DEFAULTS objectForKey:@"city"] forHTTPHeaderField:@"CITY"];        [self loadRequest:request];    }else if(![[DEFAULTS objectForKey:@"city"] isEqualToString:request.allHTTPHeaderFields[@"CITY"]]) {        [mutableRequest setValue:[DEFAULTS objectForKey:@"city"] forHTTPHeaderField:@"CITY"];        request = [mutableRequest copy];        [self loadRequest:request];    }    return YES;}