这篇文章主要介绍ios中wkwebview离线化加载h5资源的示例分析，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！
思路: 使用NSURLProtocol拦截请求转发到本地。
1.确认离线化需求
部门负责的app有一部分使用的线上h6页，长期以来加载略慢...
于是考虑使用离线化加载。
确保[低速网络]或[无网络]可网页秒开。
2.使用[NSURLProtocol]拦截
区别于uiwebview wkwebview使用如下方法拦截
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// 区别于uiwebview wkwebview使用如下方法拦截
Class cls = NSClassFromString(@"WKBrowsingContextController");
SEL sel = NSSelectorFromString(@"registerSchemeForCustomProtocol:");
if ([(id)cls respondsToSelector:sel]) {
[(id)cls performSelector:sel withObject:@"http"];
[(id)cls performSelector:sel withObject:@"https"];
}
}# 注册NSURLProtocol拦截
- (IBAction)regist:(id)sender {
[NSURLProtocol registerClass:[FilteredProtocol class]];
}# 注销NSURLProtocol拦截
- (IBAction)unregist:(id)sender {
[NSURLProtocol unregisterClass:[FilteredProtocol class]];
}3.下载[zip] + 使用[SSZipArchive]解压
需要先 #import "SSZipArchive.h
- (void)downloadZip {
NSDictionary *_headers;
NSURLSession *_session = [self sessionWithHeaders:_headers];
NSURL *url = [NSURL URLWithString: @"http://10.2.138.225:3238/dist.zip"];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
// 初始化cachepath
NSString *cachePath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
NSFileManager *fm = [NSFileManager defaultManager];
// 删除之前已有的文件
[fm removeItemAtPath:[cachePath stringByAppendingPathComponent:@"dist.zip"] error:nil];
NSURLSessionDownloadTask *downloadTask=[_session downloadTaskWithRequest:request completionHandler:^(NSURL *location, NSURLResponse *response, NSError *error) {
if (!error) {
NSError *saveError;
NSURL *saveUrl = [NSURL fileURLWithPath: [cachePath stringByAppendingPathComponent:@"dist.zip"]];
// location是下载后的临时保存路径,需要将它移动到需要保存的位置
[[NSFileManager defaultManager] copyItemAtURL:location toURL:saveUrl error:&saveError];
if (!saveError) {
NSLog(@"task ok");
if([SSZipArchive unzipFileAtPath:
[cachePath stringByAppendingPathComponent:@"dist.zip"]
toDestination:cachePath]) {
NSLog(@"unzip ok");// 解压成功
}
else {
NSLog(@"unzip err");// 解压失败
}
}
else {
NSLog(@"task err");
}
}
else {
NSLog(@"error is :%@", error.localizedDescription);
}
}];
[downloadTask resume];
}4.迁移资源至[NSTemporary]
[wkwebview]真机不支持直接加载[NSCache]资源
需要先迁移资源至[NSTemporary]
- (void)migrateDistToTempory {
NSFileManager *fm = [NSFileManager defaultManager];
NSString *cacheFilePath = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:@"dist"];
NSString *tmpFilePath = [NSTemporaryDirectory() stringByAppendingPathComponent:@"dist"];
// 先删除tempory已有的dist资源
[fm removeItemAtPath:tmpFilePath error:nil];
NSError *saveError;
// 从caches拷贝dist到tempory临时文件夹
[[NSFileManager defaultManager] copyItemAtURL:[NSURL fileURLWithPath:cacheFilePath] toURL:[NSURL fileURLWithPath:tmpFilePath] error:&saveError];
NSLog(@"Migrate dist to tempory ok");
}5.转发请求
如果[/static]开头 => 则转发[Request]到本地[.css/.js]资源
如果[index.html]结尾 => 就直接[Load]本地[index.html] (否则[index.html]可能会加载失败)
// // ProtocolCustom.m // proxy-browser // // Created by melo的微博 on 2018/4/8. // Copyright © 2018年 com. All rights reserved. // #import#import #import static NSString*const matchingPrefix = @"http://10.2.138.225:3233/static/"; static NSString*const regPrefix = @"http://10.2.138.225:3233"; static NSString*const FilteredKey = @"FilteredKey"; @interface FilteredProtocol : NSURLProtocol @property (nonatomic, strong) NSMutableData *responseData; @property (nonatomic, strong) NSURLConnection *connection; @end @implementation FilteredProtocol + (BOOL)canInitWithRequest:(NSURLRequest *)request { return [NSURLProtocol propertyForKey:FilteredKey inRequest:request]== nil; } + (NSURLRequest *)canonicalRequestForRequest:(NSURLRequest *)request { NSLog(@"Got it request.URL.absoluteString = %@",request.URL.absoluteString); NSMutableURLRequest *mutableReqeust = [request mutableCopy]; //截取重定向 if ([request.URL.absoluteString hasPrefix:matchingPrefix]) { NSURL* proxyURL = [NSURL URLWithString:[FilteredProtocol generateProxyPath: request.URL.absoluteString]]; NSLog(@"Proxy to = %@", proxyURL); mutableReqeust = [NSMutableURLRequest requestWithURL: proxyURL]; } return mutableReqeust; } + (BOOL)requestIsCacheEquivalent:(NSURLRequest *)a toRequest:(NSURLRequest *)b { return [super requestIsCacheEquivalent:a toRequest:b]; } # 如果[index.html]结尾 => 就直接[Load]本地[index.html] - (void)startLoading { NSMutableURLRequest *mutableReqeust = [[self request] mutableCopy]; // 标示改request已经处理过了，防止无限循环 [NSURLProtocol setProperty:@YES forKey:FilteredKey inRequest:mutableReqeust]; if ([self.request.URL.absoluteString hasSuffix:@"index.html"]) { NSURL *url = self.request.URL; NSString *path = [FilteredProtocol generateDateReadPath: self.request.URL.absoluteString]; NSLog(@"Read data from path = %@", path); NSFileHandle *file = [NSFileHandle fileHandleForReadingAtPath:path]; NSData *data = [file readDataToEndOfFile]; NSLog(@"Got data = %@", data); [file closeFile]; //3.拼接响应Response NSInteger dataLength = data.length; NSString *mimeType = [self getMIMETypeWithCAPIAtFilePath:path]; NSString *httpVersion = @"HTTP/1.1"; NSHTTPURLResponse *response = nil; if (dataLength > 0) { response = [self jointResponseWithData:data dataLength:dataLength mimeType:mimeType requestUrl:url statusCode:200 httpVersion:httpVersion]; } else { response = [self jointResponseWithData:[@"404" dataUsingEncoding:NSUTF8StringEncoding] dataLength:3 mimeType:mimeType requestUrl:url statusCode:404 httpVersion:httpVersion]; } //4.响应 [[self client] URLProtocol:self didReceiveResponse:response cacheStoragePolicy:NSURLCacheStorageNotAllowed]; [[self client] URLProtocol:self didLoadData:data]; [[self client] URLProtocolDidFinishLoading:self]; } else { self.connection = [NSURLConnection connectionWithRequest:mutableReqeust delegate:self]; } } - (void)stopLoading { if (self.connection != nil) { [self.connection cancel]; self.connection = nil; } } - (NSString *)getMIMETypeWithCAPIAtFilePath:(NSString *)path { if (![[[NSFileManager alloc] init] fileExistsAtPath:path]) { return nil; } CFStringRef UTI = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, (__bridge CFStringRef)[path pathExtension], NULL); CFStringRef MIMEType = UTTypeCopyPreferredTagWithClass (UTI, kUTTagClassMIMEType); CFRelease(UTI); if (!MIMEType) { return @"application/octet-stream"; } return (__bridge NSString *)(MIMEType); } #pragma mark - 拼接响应Response - (NSHTTPURLResponse *)jointResponseWithData:(NSData *)data dataLength:(NSInteger)dataLength mimeType:(NSString *)mimeType requestUrl:(NSURL *)requestUrl statusCode:(NSInteger)statusCode httpVersion:(NSString *)httpVersion { NSDictionary *dict = @{@"Content-type":mimeType, @"Content-length":[NSString stringWithFormat:@"%ld",dataLength]}; NSHTTPURLResponse *response = [[NSHTTPURLResponse alloc] initWithURL:requestUrl statusCode:statusCode HTTPVersion:httpVersion headerFields:dict]; return response; } #pragma mark- NSURLConnectionDelegate - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error { [self.client URLProtocol:self didFailWithError:error]; } #pragma mark - NSURLConnectionDataDelegate - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response { self.responseData = [[NSMutableData alloc] init]; [self.client URLProtocol:self didReceiveResponse:response cacheStoragePolicy:NSURLCacheStorageNotAllowed]; } - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { [self.responseData appendData:data]; [self.client URLProtocol:self didLoadData:data]; } - (void)connectionDidFinishLoading:(NSURLConnection *)connection { [self.client URLProtocolDidFinishLoading:self]; } + (NSString *)generateProxyPath:(NSString *) absoluteURL { NSString *tmpFilePath = [NSTemporaryDirectory() stringByAppendingPathComponent:@"dist"]; NSString *fileAbsoluteURL = [@"file:/" stringByAppendingString:tmpFilePath]; return [absoluteURL stringByReplacingOccurrencesOfString:regPrefix withString:fileAbsoluteURL]; } + (NSString *)generateDateReadPath:(NSString *) absoluteURL { NSString *fileDataReadURL = [NSTemporaryDirectory() stringByAppendingPathComponent:@"dist"]; return [absoluteURL stringByReplacingOccurrencesOfString:regPrefix withString:fileDataReadURL]; } @end
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