WKWebView實作NSURLProtocol

代碼轉載自：https://github.com/LiuShuoyu/HybirdWKWebVIew

AppDelegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    [NSURLProtocol registerClass:[HybridNSURLProtocol class]];
    return YES;
}
           

HybirdViewController:

#import "HybirdViewController.h"

#import "HybirdViewController.h"
#import <WebKit/WebKit.h>
#import "NSURLProtocol+WKWebVIew.h"

@interface HybirdViewController ()<WKNavigationDelegate,WKUIDelegate>
@property (nonatomic)  WKWebView* webView;

@end

@implementation HybirdViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    [NSURLProtocol wk_registerScheme:@"http"];
    [NSURLProtocol wk_registerScheme:@"https"];

    [self.view addSubview:self.webView];
    
    // Do any additional setup after loading the view.
}

- (WKWebView *)webView {
    if (!_webView) {
        WKWebViewConfiguration *configuration = [[WKWebViewConfiguration alloc] init];
        configuration.userContentController = [WKUserContentController new];
        
        WKPreferences *preferences = [WKPreferences new];
        preferences.javaScriptCanOpenWindowsAutomatically = YES;
        preferences.minimumFontSize = 30.0;
        configuration.preferences = preferences;
        
        _webView = [[WKWebView alloc] initWithFrame:self.view.frame configuration:configuration];
        _webView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
        
        if ([_webView respondsToSelector:@selector(setNavigationDelegate:)]) {
            [_webView setNavigationDelegate:self];
        }
        
        if ([_webView respondsToSelector:@selector(setDelegate:)]) {
            [_webView setUIDelegate:self];
        }
        NSURL *url = [NSURL URLWithString:@"https://www.yypt.com/finmobile2/login.do"];
        NSURLRequest *request = [NSURLRequest requestWithURL:url];
        [_webView loadRequest:request];
        
    }
    return _webView;
}

@end
           

NSURLProtocol+WKWebVIew.h:

#import <Foundation/Foundation.h>

@interface NSURLProtocol (WKWebVIew)

+ (void)wk_registerScheme:(NSString*)scheme;

+ (void)wk_unregisterScheme:(NSString*)scheme;


@end
           

NSURLProtocol+WKWebVIew.m

#import "NSURLProtocol+WKWebVIew.h"
#import <WebKit/WebKit.h>
//FOUNDATION_STATIC_INLINE 屬于屬于runtime範疇，你的.m檔案需要頻繁調用一個函數,可以用static inline來聲明。從SDWebImage從get到的。
FOUNDATION_STATIC_INLINE Class ContextControllerClass() {
    static Class cls;
    if (!cls) {
        cls = [[[WKWebView new] valueForKey:@"browsingContextController"] class];
    }
    return cls;
}

FOUNDATION_STATIC_INLINE SEL RegisterSchemeSelector() {
    return NSSelectorFromString(@"registerSchemeForCustomProtocol:");
}

FOUNDATION_STATIC_INLINE SEL UnregisterSchemeSelector() {
    return NSSelectorFromString(@"unregisterSchemeForCustomProtocol:");
}

@implementation NSURLProtocol (WebKitSupport)

+ (void)wk_registerScheme:(NSString *)scheme {
    Class cls = ContextControllerClass();
    SEL sel = RegisterSchemeSelector();
    if ([(id)cls respondsToSelector:sel]) {
    // 放棄編輯器警告
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
        [(id)cls performSelector:sel withObject:scheme];
#pragma clang diagnostic pop
    }
}

+ (void)wk_unregisterScheme:(NSString *)scheme {
    Class cls = ContextControllerClass();
    SEL sel = UnregisterSchemeSelector();
    if ([(id)cls respondsToSelector:sel]) {
     // 放棄編輯器警告
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
        [(id)cls performSelector:sel withObject:scheme];
#pragma clang diagnostic pop
    }
}

@end
           

HybridNSURLProtocol:

#import <Foundation/Foundation.h>

@interface HybridNSURLProtocol : NSURLProtocol

@end
           

HybridNSURLProtocol:

#import "HybridNSURLProtocol.h"
#import <UIKit/UIKit.h>
static NSString*const sourUrl  = @"https://m.baidu.com/static/index/plus/plus_logo.png";
static NSString*const sourIconUrl  = @"http://m.baidu.com/static/search/baiduapp_icon.png";
static NSString*const localUrl = @"http://mecrm.qa.medlinker.net/public/image?id=57026794&certType=workCertPicUrl&time=1484625241";

static NSString* const KHybridNSURLProtocolHKey = @"KHybridNSURLProtocol";
@interface HybridNSURLProtocol ()<NSURLSessionDelegate>
@property (nonnull,strong) NSURLSessionDataTask *task;

@end


@implementation HybridNSURLProtocol

+ (BOOL)canInitWithRequest:(NSURLRequest *)request
{
    NSLog(@"request.URL.absoluteString = %@",request.URL.absoluteString);
    NSString *scheme = [[request URL] scheme];
    if ( ([scheme caseInsensitiveCompare:@"http"]  == NSOrderedSame ||
          [scheme caseInsensitiveCompare:@"https"] == NSOrderedSame ))
    {
        //看看是否已經處理過了，防止無限循環
        if ([NSURLProtocol propertyForKey:KHybridNSURLProtocolHKey inRequest:request])
            return NO;
        return YES;
    }
    return NO;
}

+ (NSURLRequest *)canonicalRequestForRequest:(NSURLRequest *)request
{
    NSMutableURLRequest *mutableReqeust = [request mutableCopy];
    
    //request截取重定向
    if ([request.URL.absoluteString isEqualToString:sourUrl])
    {
        NSURL* url1 = [NSURL URLWithString:localUrl];
        mutableReqeust = [NSMutableURLRequest requestWithURL:url1];
    }
    
    return mutableReqeust;
}

+ (BOOL)requestIsCacheEquivalent:(NSURLRequest *)a toRequest:(NSURLRequest *)b
{
    return [super requestIsCacheEquivalent:a toRequest:b];
}

- (void)startLoading
{
    NSMutableURLRequest *mutableReqeust = [[self request] mutableCopy];
    //給我們處理過的請求設定一個辨別符, 防止無限循環,
    [NSURLProtocol setProperty:@YES forKey:KHybridNSURLProtocolHKey inRequest:mutableReqeust];
    
    //這裡最好加上緩存判斷，加載本地離線檔案， 這個直接簡單的例子。
    if ([mutableReqeust.URL.absoluteString isEqualToString:sourIconUrl])
    {
            NSData* data = UIImagePNGRepresentation([UIImage imageNamed:@"medlinker"]);
            NSURLResponse* response = [[NSURLResponse alloc] initWithURL:self.request.URL MIMEType:@"image/png" expectedContentLength:data.length textEncodingName:nil];
            [self.client URLProtocol:self didReceiveResponse:response cacheStoragePolicy:NSURLCacheStorageAllowed];
            [self.client URLProtocol:self didLoadData:data];
            [self.client URLProtocolDidFinishLoading:self];
    }
    else
    {
        NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:nil];
        self.task = [session dataTaskWithRequest:self.request];
        [self.task resume];
    }
}
- (void)stopLoading
{
    if (self.task != nil)
    {
        [self.task  cancel];
    }
}


- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveResponse:(NSURLResponse *)response completionHandler:(void (^)(NSURLSessionResponseDisposition))completionHandler {
    [[self client] URLProtocol:self didReceiveResponse:response cacheStoragePolicy:NSURLCacheStorageAllowed];
    
    completionHandler(NSURLSessionResponseAllow);
}

- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveData:(NSData *)data {
    [[self client] URLProtocol:self didLoadData:data];
}

- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(nullable NSError *)error {
    [self.client URLProtocolDidFinishLoading:self];
}

@end