iOS网络重定向，mock数据

有时候写app需要跟后台联调时由于后台服务没有就位需要自己在本地模拟数据调试，为了保证代码一致性，用apple官方的NSURLProtocol网络重定向机制可以实现简介高效直观的本地mock数据功能。

预览

工程结构

一个CustomUrlProtocol工具类，一个页面

思路

（1）在appdelegate里面注册

[NSURLProtocol registerClass:[CustomUrlProtocol class]];

（2）工具类

////  CustomSessionUrlProtocol.m//  NSUrlProtocolTrick////  Created by yxhe on 16/10/19.//  Copyright © 2016年 tashaxing. All rights reserved.//#import "CustomUrlProtocol.h"#define kProtocolKey @"SessionProtocolKey"@interface CustomUrlProtocol ()<NSURLSessionDelegate>{    NSURLConnection *_connection;    NSURLSession *_session;}@end@implementation CustomUrlProtocol#pragma mark - Protocol相关方法// 是否拦截处理task//+ (BOOL)canInitWithTask:(NSURLSessionTask *)task//{//    //    //    return YES;//}// 是否拦截处理request+ (BOOL)canInitWithRequest:(NSURLRequest *)request{    if ([NSURLProtocol propertyForKey:kProtocolKey inRequest:request])    {        return NO;    }            // 这里可以设置拦截过滤//    NSString * url = request.URL.absoluteString;//    if ([url hasPrefix:@"http"] || [url hasPrefix:@"https"])//    {//        return YES;//    }        return YES;}// 重定向+ (NSURLRequest *)canonicalRequestForRequest:(NSURLRequest *)request{    NSMutableURLRequest *mutableRequest = [request mutableCopy];        return [self redirectRequest:mutableRequest];}- (void)startLoading{    // 表示该请求已经被处理，防止无限循环    [NSURLProtocol setProperty:@(YES) forKey:kProtocolKey inRequest:(NSMutableURLRequest *)self.request];        // 普通方式,可以读取本地文件，图片路径，json等    NSString *filePath = [[NSBundle mainBundle] pathForResource:@"test" ofType:@"json"];    NSData *redirectData = [NSData dataWithContentsOfFile:filePath];    NSURLResponse *redirectResponse = [[NSURLResponse alloc] initWithURL:self.request.URL                                                                MIMEType:@"application/json"                                                   expectedContentLength:redirectData.length                                                        textEncodingName:nil];        [self.client URLProtocol:self          didReceiveResponse:redirectResponse          cacheStoragePolicy:NSURLCacheStorageNotAllowed];    [self.client URLProtocol:self didLoadData:redirectData];    [self.client URLProtocolDidFinishLoading:self];            // connection代理方式//    _connection = [NSURLConnection connectionWithRequest:self.request delegate:self];        // session代理方式//    NSURLSessionConfiguration * config = [NSURLSessionConfiguration defaultSessionConfiguration];//    _session = [NSURLSession sessionWithConfiguration:config//                                             delegate:self//                                        delegateQueue:[[NSOperationQueue alloc] init]];//    NSURLSessionDataTask *dataTask = [_session dataTaskWithRequest:self.request];//    //    //    //    [dataTask resume];        }- (void)stopLoading{    [_connection cancel];    _connection = nil;    //    [_session invalidateAndCancel];//    _session = nil;}#pragma mark - 自定义方法+ (NSMutableURLRequest *)redirectRequest:(NSMutableURLRequest *)srcRequest{    // 在这里对原理啊的request作各种修改，改url加头部都可以    if (srcRequest.URL.absoluteString.length == 0)    {        return srcRequest;    }        srcRequest.URL = [NSURL URLWithString:@"http://www.baidu.com"];//    NSMutableArray *httpHeader = [srcRequest.allHTTPHeaderFields mutableCopy];//    [httpHeader setObject:@"11111" atIndexedSubscript:@"newFiled"];        return srcRequest;}#pragma mark - NSUrLConnectionDataDelgate// connection的走这里- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{    [self.client URLProtocol:self didReceiveResponse:response cacheStoragePolicy:NSURLCacheStorageNotAllowed];}- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{    [self.client URLProtocol:self didLoadData:data];}- (void)connectionDidFinishLoading:(NSURLConnection *)connection{    [self.client URLProtocolDidFinishLoading:self];}- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{    [self.client URLProtocol:self didFailWithError:error];}#pragma mark - NSURLSessionDataDelegate，如果原来的请求是用代理形式做的，在这里处理// session的走这里-(void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error{    if (error)    {        [self.client URLProtocol:self didFailWithError:error];    } else    {        [self.client URLProtocolDidFinishLoading:self];    }}-(void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveResponse:(NSURLResponse *)response completionHandler:(void (^)(NSURLSessionResponseDisposition))completionHandler{    [self.client URLProtocol:self didReceiveResponse:response cacheStoragePolicy:NSURLCacheStorageNotAllowed];    completionHandler(NSURLSessionResponseAllow);}-(void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveData:(NSData *)data{    [self.client URLProtocol:self didLoadData:data];}- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask willCacheResponse:(NSCachedURLResponse *)proposedResponse completionHandler:(void (^)(NSCachedURLResponse *cachedResponse))completionHandler{    completionHandler(proposedResponse);}@end

• 设置对应过滤规则拦截
• 可以进行url重定向
• 可以拦截请求，将本地的json等数据拼成会送报文回送回去

（3）页面

////  ViewController.m//  NSUrlProtocolTrick////  Created by yxhe on 16/10/19.//  Copyright © 2016年 tashaxing. All rights reserved.//#import "ViewController.h"@interface ViewController ()@property (weak, nonatomic) IBOutlet UITextView *jsonTextView;@property (weak, nonatomic) IBOutlet UIWebView *webView;@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.}// 点击请求数据- (IBAction)loadJsonClicked:(id)sender{    // session api//    NSString *httpUrl = @"http://www.qq.com";//    //    NSURLSession *session = [NSURLSession sharedSession];//    NSURL *url = [NSURL URLWithString:httpUrl];//    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];////    NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {//        if(!error)//        {//            NSString *str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];//            NSLog(@"%@", str);//            dispatch_async(dispatch_get_main_queue(), ^{//                self.jsonTextView.text = str;//            });//        }//        else//        {//            NSLog(@"%@", error.localizedDescription);//        //        }//    }];//    //    [dataTask resume];        // connection api    NSString *httpUrl = @"http://www.qq.com";    NSURL *url = [NSURL URLWithString:httpUrl];    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];    request.HTTPMethod = @"GET";        [NSURLConnection sendAsynchronousRequest:request                                       queue:[NSOperationQueue mainQueue]                           completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {                               if(connectionError)                                   NSLog(@"Httperror: %@%ld", connectionError.localizedDescription, connectionError.code);                               else                               {                                                                      NSString *str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];                                   NSLog(@"%@", str);                                   dispatch_async(dispatch_get_main_queue(), ^{                                       self.jsonTextView.text = str;                                   });                                                                                                     }                           }];}// 点击加载网页- (IBAction)loadWebClicked:(id)sender{    NSURL *url = [NSURL URLWithString:@"http://weixin.qq.com"];    NSURLRequest *request = [NSURLRequest requestWithURL:url];    [self.webView loadRequest:request];}- (void)didReceiveMemoryWarning{    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end

源代码下载

csdn:ios网络重定向

github：ios网络重定向