1.NSURLSession概述
1. NSURLSession session類型
NSURLSession包括下面3種session類型
a). Default session(默認(rèn)會話模式)：
使用的是基于磁盤緩存的持久化策略,工作模式類似于原來的NSURLConnection灭美，可以用來取代NSURLConnection中的:
[NSURLConnection sendAsynchronousRequest:queue:completionHandler:]
b). Ephemeral session(瞬時會話模式)：
臨時的進(jìn)程內(nèi)會話（內(nèi)存）泞莉，不會將cookie、證書嚣伐、緩存儲存到本地，只會放到內(nèi)存中，當(dāng)應(yīng)用程序退出后數(shù)據(jù)也會消失。
c). Background session(后臺會話模式)：
和默認(rèn)會話模式類似, 不過相比默認(rèn)模式吹由，該會話會在后臺開啟一個線程進(jìn)行網(wǎng)絡(luò)數(shù)據(jù)處理。
//Default session
+ (NSURLSessionConfiguration *)defaultSessionConfiguration;
//Ephemeral
+ (NSURLSessionConfiguration *)ephemeralSessionConfiguration;
//Background
+ (NSURLSessionConfiguration *)backgroundSessionConfiguration:(NSString *)identifier;
你需要了解包括NSURLSession朱嘴、NSURLSessionConfiguration 以及 NSURLSessionTask 的 3 個子類：NSURLSessionDataTask倾鲫，NSURLSessionUploadTask粗合，NSURLSessionDownloadTask。
與 NSURLConnection 相比乌昔，NSURLsession 最直接的改進(jìn)就是可以配置每個 session 的緩存隙疚，協(xié)議，cookie磕道，以及證書策略供屉，甚至跨程序共享這些信息。這將允許程序和網(wǎng)絡(luò)基礎(chǔ)框架之間相互獨立溺蕉，不會發(fā)生干擾伶丐。每個 NSURLSession 對象都由一個 NSURLSessionConfiguration 對象來進(jìn)行初始化。
NSURLSession 中另一大塊就是 session task疯特。它負(fù)責(zé)處理數(shù)據(jù)的加載以及文件和數(shù)據(jù)在客戶端與服務(wù)端之間的上傳和下載哗魂。NSURLSessionTask 與 NSURLConnection 最大的相似之處在于它也負(fù)責(zé)數(shù)據(jù)的加載，最大的不同之處在于所有的 task 共享其創(chuàng)造者 NSURLSession 這一公共委托者（common delegate）漓雅。
2.NSURLSessionTask類
NSURLSessionTask是一個抽象子類录别，它有三個子類：NSURLSessionDataTask，NSURLSessionUploadTask和NSURLSessionDownloadTask故硅。這三個類封裝了現(xiàn)代應(yīng)用程序的三個基本網(wǎng)絡(luò)任務(wù)：獲取數(shù)據(jù)，比如JSON或XML纵搁，以及上傳和下載文件吃衅。
下面是其繼承關(guān)系：
不同于直接使用 alloc-init 初始化方法，task 是由一個 NSURLSession 創(chuàng)建的腾誉。每個 task 的構(gòu)造方法都對應(yīng)有或者沒有 completionHandler 這個 block 的兩個版本徘层。
1).NSURLSessionDataTask
NSURLSessionDataTask使用NSData來交換數(shù)據(jù). NSURLSessionDataTask不支持后臺會話模式。
a) 通過request對象或url創(chuàng)建
//通過一個給定的請求
- (NSURLSessionDataTask *)dataTaskWithRequest:(NSURLRequest *)request;
//通過一個給定的URL.
- (NSURLSessionDataTask *)dataTaskWithURL:(NSURL *)url;
代理方法：
- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask
didReceiveResponse:(NSURLResponse *)response
completionHandler:(void (^)(NSURLSessionResponseDisposition disposition))completionHandler
{
completionHandler(NSURLSessionResponseAllow);
}
- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask
didReceiveData:(NSData *)data
{
//data: response from the server.
}
b).通過request對象或url創(chuàng)建利职，同時指定任務(wù)完成后通過completionHandler指定回調(diào)的代碼塊：
- (NSURLSessionDataTask *)dataTaskWithRequest:(NSURLRequest *)request completionHandler:(void (^)(NSData *data, NSURLResponse *response, NSError *error))completionHandler;
- (NSURLSessionDataTask *)dataTaskWithURL:(NSURL *)url completionHandler:(void (^)(NSData *data, NSURLResponse *response, NSError *error))completionHandler;
2).NSURLSessionDownloadTask
a).通過URL/request/resumeData創(chuàng)建
- (NSURLSessionDownloadTask *)downloadTaskWithRequest:(NSURLRequest *)request;
- (NSURLSessionDownloadTask *)downloadTaskWithURL:(NSURL *)url;
//下載任務(wù)支持?jǐn)帱c續(xù)傳趣效，這種方式是通過之前已經(jīng)下載的數(shù)據(jù)來創(chuàng)建下載任務(wù)。
- (NSURLSessionDownloadTask *)downloadTaskWithResumeData:(NSData *)resumeData;
代理方法：
- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask
didFinishDownloadingToURL:(NSURL *)location;
- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask
didWriteData:(int64_t)bytesWritten
totalBytesWritten:(int64_t)totalBytesWritten
totalBytesExpectedToWrite:(int64_t)totalBytesExpectedToWrite;
- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask
didResumeAtOffset:(int64_t)fileOffset
expectedTotalBytes:(int64_t)expectedTotalBytes;
b).通過completionHandler指定任務(wù)完成后的回調(diào)代碼塊：
- (NSURLSessionDownloadTask *)downloadTaskWithRequest:(NSURLRequest *)request completionHandler:(void (^)(NSURL *location, NSURLResponse *response, NSError *error))completionHandler;
- (NSURLSessionDownloadTask *)downloadTaskWithURL:(NSURL *)url completionHandler:(void (^)(NSURL *location, NSURLResponse *response, NSError *error))completionHandler;
- (NSURLSessionDownloadTask *)downloadTaskWithResumeData:(NSData *)resumeData completionHandler:(void (^)(NSURL *location, NSURLResponse *response, NSError *error))completionHandler;
3).NSURLSessionUploadTask
a).通過request創(chuàng)建猪贪，在上傳時指定文件源或數(shù)據(jù)源跷敬。
- (NSURLSessionUploadTask *)uploadTaskWithRequest:(NSURLRequest *)request fromFile:(NSURL *)fileURL;
- (NSURLSessionUploadTask *)uploadTaskWithRequest:(NSURLRequest *)request fromData:(NSData *)bodyData;
- (NSURLSessionUploadTask *)uploadTaskWithStreamedRequest:(NSURLRequest *)request;
代理方法：
- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task
didSendBodyData:(int64_t)bytesSent
totalBytesSent:(int64_t)totalBytesSent
totalBytesExpectedToSend:(int64_t)totalBytesExpectedToSend;
b).通過completionHandler指定任務(wù)完成后的回調(diào)代碼塊
- (NSURLSessionUploadTask *)uploadTaskWithRequest:(NSURLRequest *)request fromFile:(NSURL *)fileURL completionHandler:(void (^)(NSData *data, NSURLResponse *response, NSError *error))completionHandler;
- (NSURLSessionUploadTask *)uploadTaskWithRequest:(NSURLRequest *)request fromData:(NSData *)bodyData completionHandler:(void (^)(NSData *data, NSURLResponse *response, NSError *error))completionHandler;
3.NSURLSession類
從上面我們已經(jīng)知道創(chuàng)建一個NSURLSessionTask需要NSURLSession，獲取NSURLSession類對象有幾種方式：
//使用全局的Cache热押，Cookie和證書西傀。
+ (NSURLSession *)sharedSession;
//創(chuàng)建對應(yīng)配置的會話。
+ (NSURLSession *)sessionWithConfiguration:(NSURLSessionConfiguration *)configuration;
+ (NSURLSession *)sessionWithConfiguration:(NSURLSessionConfiguration *)configuration delegate:(id <NSURLSessionDelegate>)delegate delegateQueue:(NSOperationQueue *)queue;
第三種方式指定了session的委托和委托所處的隊列桶癣。當(dāng)不再需要連接時拥褂，可以調(diào)用Session的invalidateAndCancel直接關(guān)閉，或者調(diào)用finishTasksAndInvalidate等待當(dāng)前Task結(jié)束后關(guān)閉牙寞。這時Delegate會收到URLSession:didBecomeInvalidWithError:這個事件饺鹃。Delegate收到這個事件之后會被解引用。
3.NSURLSessionConfiguration類
上面2、3種創(chuàng)建方式使用了NSURLSessionConfiguration悔详，它用于配置會話的屬性镊屎，創(chuàng)建方法如下：
+ (NSURLSessionConfiguration *)defaultSessionConfiguration;
+ (NSURLSessionConfiguration *)ephemeralSessionConfiguration;
//identifier參數(shù)指定了會話的ID，用于標(biāo)記后臺的session伟端。
+ (NSURLSessionConfiguration *)backgroundSessionConfiguration:(NSString *)identifier;
這個類有兩個屬性：
@property BOOL allowsCellularAccess;
@property (getter=isDiscretionary) BOOL discretionary NS_AVAILABLE(NA, 7_0);
allowsCellularAccess 屬性指定是否允許使用蜂窩連接杯道， discretionary屬性為YES時表示當(dāng)程序在后臺運作時由系統(tǒng)自己選擇最佳的網(wǎng)絡(luò)連接配置，該屬性可以節(jié)省通過蜂窩連接的帶寬责蝠。在使用后臺傳輸數(shù)據(jù)的時候党巾，建議使用discretionary屬性，而不是allowsCellularAccess屬性霜医，因為它會把WiFi和電源可用性考慮在內(nèi)齿拂。
2.實例
創(chuàng)建一個NSURLSession任務(wù)需要遵循以下步驟：
a)創(chuàng)建一個Session Configuration
b)創(chuàng)建一個NSURLSession
c) 創(chuàng)建一個NSURLSession Task ( Data,Download or Upload)
d)代理方法
e)調(diào)用resume方法
1.數(shù)據(jù)請求
前面通過請求一個NSURLSessionDataTask進(jìn)行數(shù)據(jù)請求演示:
- (IBAction)loadData:(UIButton *)sender {
// 創(chuàng)建Data Task，
NSURL *url = [NSURL URLWithString:@"http://www.reibang.com/users/9tsPFp/latest_articles"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
NSURLSession *session = [NSURLSession sharedSession];
NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request
completionHandler:
^(NSData *data, NSURLResponse *response, NSError *error) {
// 輸出返回的狀態(tài)碼肴敛，請求成功的話為200
if (!error) {
[self showResponseCode:response];
}else{
NSLog(@"error is :%@",error.localizedDescription);
}
}];
// 使用resume方法啟動任務(wù)
[dataTask resume];
}
- (void)showResponseCode:(NSURLResponse *)response {
NSHTTPURLResponse* httpResponse = (NSHTTPURLResponse*)response;
NSInteger responseStatusCode = [httpResponse statusCode];
NSLog(@"狀態(tài)碼--%ld", (long)responseStatusCode);
}
2.HTTP GET和POST
1).GET
我們使用豆瓣的API來演示這個GET請求
- (IBAction)GETRequest:(id)sender {
NSURLSessionConfiguration *defaultConfigObject = [NSURLSessionConfiguration defaultSessionConfiguration];
NSURLSession *delegateFreeSession = [NSURLSession sessionWithConfiguration: defaultConfigObject delegate: self delegateQueue: [NSOperationQueue mainQueue]];
NSURL * url = [NSURL URLWithString:@"https://api.douban.com/v2/book/1220562"];
NSURLSessionDataTask * dataTask = [delegateFreeSession dataTaskWithURL:url
completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
if(error == nil)
{
NSString * text = [[NSString alloc] initWithData: data encoding: NSUTF8StringEncoding];
NSLog(@"GET請求數(shù)據(jù)= %@",text);
}
}];
[dataTask resume];
}
數(shù)據(jù)請求結(jié)果如下：
2).POST
我們使用http://hayageek.com/examples/jquery/ajax-post/ajax-post.php 這個接口來演示POST請求署海，POST需要4個參數(shù): name, loc, age, submit，如下：
- (IBAction)POSTRequest:(UIButton *)sender {
NSURLSessionConfiguration *defaultConfigObject = [NSURLSessionConfiguration defaultSessionConfiguration];
NSURLSession *delegateFreeSession = [NSURLSession sessionWithConfiguration: defaultConfigObject delegate: nil delegateQueue: [NSOperationQueue mainQueue]];
NSURL * url = [NSURL URLWithString:@"http://hayageek.com/examples/jquery/ajax-post/ajax-post.php"];
NSMutableURLRequest * urlRequest = [NSMutableURLRequest requestWithURL:url];
NSString * params =@"name=Ravi&loc=India&age=31&submit=true";
[urlRequest setHTTPMethod:@"POST"];
[urlRequest setHTTPBody:[params dataUsingEncoding:NSUTF8StringEncoding]];
NSURLSessionDataTask * dataTask =[delegateFreeSession dataTaskWithRequest:urlRequest
completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
NSLog(@"Response:%@ %@\n", response, error);
if(error == nil)
{
NSString * text = [[NSString alloc] initWithData: data encoding: NSUTF8StringEncoding];
NSLog(@"POST返回數(shù)據(jù) = %@",text);
}
}];
[dataTask resume];
}
返回數(shù)據(jù)：
Response:<NSHTTPURLResponse: 0x7ff948778240> { URL: http://hayageek.com/examples/jquery/ajax-post/ajax-post.php } { status code: 200, headers {
Connection = "keep-alive";
"Content-Encoding" = gzip;
"Content-Type" = "text/html";
Date = "Wed, 18 Mar 2015 01:43:07 GMT";
Server = nginx;
"Transfer-Encoding" = Identity;
Vary = "Accept-Encoding, Accept-Encoding";
"X-Powered-By" = "EasyEngine 2.0.0";
} } (null)
2015-03-18 09:43:10.418 WebConnectionDemo[28129:2666176] POST返回數(shù)據(jù) = Data from server: {"name":"Ravi","loc":"India","age":"31","submit":"true"}<br>
3.NSURLSessionUploadTask
Upload task 的創(chuàng)建需要使用一個 request医男，另外加上一個要上傳的 NSData 對象或者是一個本地文件的路徑對應(yīng)的 NSURL砸狞，類似的代碼如下：
NSURL *URL = [NSURL URLWithString:@"http://example.com/upload"];
NSURLRequest *request = [NSURLRequest requestWithURL:URL];
NSData *data = ...;
NSURLSession *session = [NSURLSession sharedSession];
NSURLSessionUploadTask *uploadTask = [session uploadTaskWithRequest:request
fromData:data
completionHandler:
^(NSData *data, NSURLResponse *response, NSError *error) {
// ...
}];
[uploadTask resume];
4.NSURLSessionDownloadTask
a.普通下載
- (IBAction)download:(id)sender {
NSURL * url = [NSURL URLWithString:@"http://e.hiphotos.baidu.com/image/pic/item/63d0f703918fa0ec14b94082249759ee3c6ddbc6.jpg"];
NSURLSessionConfiguration *defaultConfigObject = [NSURLSessionConfiguration defaultSessionConfiguration];
NSURLSession *defaultSession = [NSURLSession sessionWithConfiguration: defaultConfigObject delegate:self delegateQueue: [NSOperationQueue mainQueue]];
NSURLSessionDownloadTask * downloadTask =[ defaultSession downloadTaskWithURL:url];
[downloadTask resume];
}
為了實現(xiàn)下載進(jìn)度的顯示，需要在委托中的以下方法中實現(xiàn)：
-(void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didWriteData:(int64_t)bytesWritten totalBytesWritten:(int64_t)totalBytesWritten totalBytesExpectedToWrite:(int64_t)totalBytesExpectedToWrite
{
float progress = totalBytesWritten*1.0/totalBytesExpectedToWrite;
dispatch_async(dispatch_get_main_queue(),^ {
[self.process setProgress:progress animated:YES];
});
NSLog(@"Progress =%f",progress);
NSLog(@"Received: %lld bytes (Downloaded: %lld bytes) Expected: %lld bytes.\n",
bytesWritten, totalBytesWritten, totalBytesExpectedToWrite);
}
Download task 是將數(shù)據(jù)一點點地寫入本地的臨時文件镀梭。我們需要把文件從一個臨時地址移動到一個永久的地址保存起來：：
-(void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didFinishDownloadingToURL:(NSURL *)location
{
NSLog(@"Temporary File :%@\n", location);
NSError *err = nil;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *docsDir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSURL *docsDirURL = [NSURL fileURLWithPath:[docsDir stringByAppendingPathComponent:@"out1.zip"]];
if ([fileManager moveItemAtURL:location
toURL:docsDirURL
error: &err])
{
NSLog(@"File is saved to =%@",docsDir);
}
else
{
NSLog(@"failed to move: %@",[err userInfo]);
}
}
如下所示：
b.可取消的下載
我們將做一些改動刀森，使其支持取消下載，先創(chuàng)建一個全局NSURLSessionDownloadTask對象：
@property (strong, nonatomic) NSURLSessionDownloadTask *cancellableTask;
調(diào)用cancle方法即可取消：
- (IBAction)cancleDownload:(UIButton *)sender {
if (self.cancellableTask) {
[self.cancellableTask cancel];
self.cancellableTask = nil;
}
}
這樣點擊cancle按鈕后下載任務(wù)會取消报账，重新點擊下載會從最初的經(jīng)度條開始下載研底。
c.斷點續(xù)傳下載
斷點續(xù)傳，我們需要一個NSData來暫存我們下載的數(shù)據(jù)：
@property (strong, nonatomic) NSData *partialData;
download方法中做以下改動透罢，如果已經(jīng)有緩存的數(shù)據(jù)榜晦，即使用downloadTaskWithResumeData進(jìn)行下載：
- (IBAction)download:(UIButton *)sender {
NSURLSessionConfiguration *defaultConfigObject = [NSURLSessionConfiguration defaultSessionConfiguration];
NSURLSession *defaultSession = [NSURLSession sessionWithConfiguration: defaultConfigObject delegate:self delegateQueue: [NSOperationQueue mainQueue]];
if (self.partialData) {
self.cancellableTask = [defaultSession downloadTaskWithResumeData:self.partialData];
}
else{
NSURL * url = [NSURL URLWithString:@"http://e.hiphotos.baidu.com/image/pic/item/63d0f703918fa0ec14b94082249759ee3c6ddbc6.jpg"];
self.cancellableTask =[ defaultSession downloadTaskWithURL:url];
}
[self.cancellableTask resume];
}
cancle方法也需要做改動，我們需要保存我們已下載的數(shù)據(jù)：
- (IBAction)cancleDownload:(UIButton *)sender {
if (self.cancellableTask) {
[self.cancellableTask cancelByProducingResumeData:^(NSData *resumeData) {
self.partialData = resumeData;
}];
self.cancellableTask = nil;
}
}
另外恢復(fù)下載時羽圃，NSURLSessionDownloadDelegate中的以下方法將被調(diào)用：
-(void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didResumeAtOffset:(int64_t)fileOffset expectedTotalBytes:(int64_t)expectedTotalBytes{
NSLog(@"NSURLSessionDownloadDelegate: Resume download at %lld", fileOffset);
}
如下：
6.后臺下載
首先創(chuàng)建一個全局對象：
@property (strong, nonatomic) NSURLSessionDownloadTask * backgroundDownloadTask;
配置下載任務(wù)：
- (IBAction)downoadBackground:(id)sender {
NSURL * url = [NSURL URLWithString:@"https://developer.apple.com/library/ios/documentation/General/Conceptual/CocoaEncyclopedia/CocoaEncyclopedia.pdf"];
NSURLSessionConfiguration * backgroundConfig = [NSURLSessionConfiguration backgroundSessionConfigurationWithIdentifier:@"backgroundtask1"];
NSURLSession *backgroundSeesion = [NSURLSession sessionWithConfiguration: backgroundConfig delegate:self delegateQueue: [NSOperationQueue mainQueue]];
self.backgroundDownloadTask =[ backgroundSeesion downloadTaskWithURL:url];
[self.backgroundDownloadTask resume];
}
在程序進(jìn)入后臺后乾胶，如果下載任務(wù)完成，AppDelegate中的對應(yīng)方法將被調(diào)用：
- (void)application:(UIApplication *)application handleEventsForBackgroundURLSession:(NSString *)identifier completionHandler:(void (^)())completionHandler
{
NSLog(@"Save completionHandler");
self.completionHandler = completionHandler;
}
然后修改上面那個協(xié)議方法朽寞，如下：
-(void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didFinishDownloadingToURL:(NSURL *)location
{
if (downloadTask == self.cancellableTask) {
NSLog(@"Temporary File :%@\n", location);
NSError *err = nil;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *docsDir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSURL *docsDirURL = [NSURL fileURLWithPath:[docsDir stringByAppendingPathComponent:@"out1.zip"]];
if ([fileManager moveItemAtURL:location
toURL:docsDirURL
error: &err]){
NSLog(@"File is saved to =%@",docsDir);
}
else{
NSLog(@"failed to move: %@",[err userInfo]);
}
}else if(downloadTask == self.backgroundDownloadTask){
NSLog(@"Background URL session %@ finished events.\n", session);
AppDelegate * delegate =(AppDelegate *)[[UIApplication sharedApplication] delegate];
if(delegate.completionHandler)
{
void (^handler)() = delegate.completionHandler;
handler();
}
}
}
運行程序并退出當(dāng)前程序后打印結(jié)果如下：
Received: 21127 bytes (Downloaded: 1439932 bytes) Expected: 1464162 bytes.
Progress =0.997860
Received: 21096 bytes (Downloaded: 1461028 bytes) Expected: 1464162 bytes.
Progress =1.000000
Received: 3134 bytes (Downloaded: 1464162 bytes) Expected: 1464162 bytes.
Background URL session <__NSURLBackgroundSession: 0x7fc5c357b560> finished events.
關(guān)于NSURLSessionConfiguration的配置策略你可以在這篇文章中找到胚吁。
1.AFNNetworking 2.0
你相信你一定知道AFNNetworking，不知道你還可以看看該作者的博文愁憔，所以我就不多說關(guān)于它的強(qiáng)大之處了腕扶，AFNetworking 提供了比NSURLSession更高層次的抽象，這篇文章主要總結(jié)AFNNetworking 2.0的幾個常用方法吨掌。
1).GET和POST請求
GET:
- (NSURLSessionDataTask *)GET:(NSString *)URLString
parameters:(id)parameters
success:(void (^)(NSURLSessionDataTask *task, id responseObject))success
failure:(void (^)(NSURLSessionDataTask *task, NSError *error))failure
POST:
- (NSURLSessionDataTask *)POST:(NSString *)URLString
parameters:(id)parameters
success:(void (^)(NSURLSessionDataTask *task, id responseObject))success
failure:(void (^)(NSURLSessionDataTask *task, NSError *error))failure
在實際的開發(fā)中半抱，我比較習(xí)慣把第三方的代碼進(jìn)行一層封裝脓恕，如下我們把GET和POST請求封裝起來：
//GET
+ (void)getWithPath:(NSString *)path params:(NSDictionary *)params success:(HttpSuccessBlock)success failure:(HttpFailureBlock)failure{
[self requestWithPath:path params:params success:success failure:failure method:@"GET"];
}
//POST
+ (void)postWithPath:(NSString *)path params:(NSDictionary *)params success:(HttpSuccessBlock)success failure:(HttpFailureBlock)failure{
[self requestWithPath:path params:params success:success failure:failure method:@"POST"];
}
typedef void (^HttpSuccessBlock)(id JSON);
typedef void (^HttpFailureBlock)(NSError *error);
...省略
+ (void)requestWithPath:(NSString *)path params:(NSDictionary *)params success:(HttpSuccessBlock)success failure:(HttpFailureBlock)failure method:(NSString *)method{
AFHTTPSessionManager *manager = [[AFHTTPSessionManager alloc] initWithBaseURL:[NSURL URLWithString:kBaseURL]];
manager.responseSerializer = [AFJSONResponseSerializer serializer];
manager.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"text/plain",@"application/json", @"text/json", @"text/javascript", @"text/html", nil];
if ([method isEqual: @"GET"]) {
[manager GET:path parameters:params success:^(NSURLSessionDataTask *task, id responseObject) {
success(responseObject);
} failure:^(NSURLSessionDataTask *task, NSError *error) {
NSLog(@"fail Get!!%@",error);
failure(error);
}];
}else if ([method isEqual:@"POST"]){
[manager POST:path parameters:params success:^(NSURLSessionDataTask *task, id responseObject) {
NSLog(@"POST成功:%@",responseObject);
success(responseObject);
} failure:^(NSURLSessionDataTask *task, NSError *error) {
NSLog(@"fail POST!!%@",error);
failure(error);
}];
}
}
你有沒有注意到上面我設(shè)置了如下代碼：
manager.responseSerializer = [AFJSONResponseSerializer serializer];
manager.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"text/plain",@"application/json", @"text/json", @"text/javascript", @"text/html", nil];
因為AFNetworking的responseSerializer 屬性只能默認(rèn)只能處理特定的Content-Type，如果你想處理"text/html"等其它類型窿侈，你需要明確指定它的acceptableContentTypes炼幔。
2).多文件上傳
如下，這是我寫的第三方微博客戶端中多圖上傳的實例代碼：
[manager POST:@"2/statuses/upload.json"
parameters:@{@"access_token": accseeToken,
@"status" : encodeStatus,
@"visible" : @(_intVisible),
@"lat" : @(_latitude),
@"long" : @(_longtitude)}
constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
NSMutableArray *images = [NSMutableArray arrayWithArray:weakSelf.images];
for (id asset in images) {
NSData *data = nil;
if ([asset isKindOfClass:[UIImage class]]) {
data = UIImageJPEGRepresentation(asset, 0.4);
}
if ([asset isKindOfClass:ALAsset.class]) {
UIImage *original = [UIImage imageWithCGImage: [[asset defaultRepresentation] fullScreenImage]];
data = UIImageJPEGRepresentation(original, 0.4);
}
[formData appendPartWithFileData:data name:@"pic" fileName:@"pic.jpg" mimeType:@"multipart/form-data"];
}
} success:^(NSURLSessionDataTask *task, id responseObject) {
NSLog(@"發(fā)送成功");
[self back];
} failure:^(NSURLSessionDataTask *task, NSError *error) {
[self showFailHUD];
}];
3).多線程操作
如果你需要開啟多個線程, 你需要使用AFHTTPRequestSerializer
史简，AFHTTPRequestOperation和NSOperationQueue
以下是AFNetworking的實例代碼
NSMutableArray *mutableOperations = [NSMutableArray array];
for (NSURL *fileURL in filesToUpload) {
NSURLRequest *request = [[AFHTTPRequestSerializer serializer] multipartFormRequestWithMethod:@"POST" URLString:@"http://example.com/upload" parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
[formData appendPartWithFileURL:fileURL name:@"images[]" error:nil];
}];
AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
[mutableOperations addObject:operation];
}
NSArray *operations = [AFURLConnectionOperation batchOfRequestOperations:@[...] progressBlock:^(NSUInteger numberOfFinishedOperations, NSUInteger totalNumberOfOperations) {
NSLog(@"%lu of %lu complete", numberOfFinishedOperations, totalNumberOfOperations);
} completionBlock:^(NSArray *operations) {
NSLog(@"All operations in batch complete");
}];
[[NSOperationQueue mainQueue] addOperations:operations waitUntilFinished:NO];
3).網(wǎng)絡(luò)狀態(tài)檢查
網(wǎng)絡(luò)狀態(tài)檢查在早期都是通過蘋果官方的Reachability類進(jìn)行檢查乃秀，但是這個類本身存在一些問題,并且官方后來沒有再更新。我們可以直接使用AFNetworking框架檢測圆兵。不管使用官方提供的類還是第三方框架跺讯，用法都是類似的，通常是發(fā)送一個URL然后去檢測網(wǎng)絡(luò)狀態(tài)變化殉农，網(wǎng)絡(luò)改變后則調(diào)用相應(yīng)的網(wǎng)絡(luò)狀態(tài)改變方法诗充。如下：
-(void)alert:(NSString *)message{
UIAlertView *alertView=[[UIAlertView alloc]initWithTitle:@"System Info" message:message delegate:nil cancelButtonTitle:@"Cancel" otherButtonTitles: nil];
[alertView show];
}
-(void)checkNetworkStatus{
//創(chuàng)建一個用于測試的url
NSURL *url=[NSURL URLWithString:@"http://www.apple.com"];
AFHTTPRequestOperationManager *operationManager=[[AFHTTPRequestOperationManager alloc]initWithBaseURL:url];
//根據(jù)不同的網(wǎng)絡(luò)狀態(tài)改變?nèi)プ鱿鄳?yīng)處理
[operationManager.reachabilityManager setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {
switch (status) {
case AFNetworkReachabilityStatusReachableViaWWAN:
[self alert:@"2G/3G/4G Connection."];
break;
case AFNetworkReachabilityStatusReachableViaWiFi:
[self alert:@"WiFi Connection."];
break;
case AFNetworkReachabilityStatusNotReachable:
[self alert:@"Network not found."];
break;
default:
[self alert:@"Unknown."];
break;
}
}];
//開始監(jiān)控
[operationManager.reachabilityManager startMonitoring];
}
