如何選擇AFNetworking版本
首先得下載AFNetworking庫文件,下載時得首先弄清楚,你將要開發的軟件兼容的最低版本是多少。AFNetworking 2.0或者之後的版本需要xcode5.0版本並且只能爲IOS6或更高的手機系統上運行,如果開發MAC程序,那麼2.0版本只能在MAC OS X 10.8或者更高的版本上運行。
AFNetworking 2.0的下載地址https://github.com/AFNetworking/AFNetworking
如果你想要兼容IOS5或MAC OS X 10.7,那你需要用最新發布的1.x版本
AFNetworking 1.x的下載地址https://github.com/AFNetworking/AFNetworking/tree/1.x
如果要兼容4.3或者MAC OS X 10.6,需要用最新發布的0.10.x版本
AFNetworking 0.10.xhttps://github.com/AFNetworking/AFNetworking/tree/0.10.x
如何通過URL獲取json數據
第一種,利用AFJSONRequestOperation,官方網站上給的例子:
- NSString *str=[NSString stringWithFormat:@"https://alpha-api.app.net/stream/0/posts/stream/global"];
- NSURL *url = [NSURL URLWithString:[str stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
- NSURLRequest *request = [NSURLRequest requestWithURL:url];
- // 從URL獲取json數據
- AFJSONRequestOperation *operation1 = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, NSDictionary* JSON) {
- NSLog(@"獲取到的數據爲:%@",JSON);
- } failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id data) {
- NSLog(@"發生錯誤!%@",error);
- }];
- [operation1 start];
第二種方法,利用AFHTTPRequestOperation 先獲取到字符串形式的數據,然後轉換成json格式,將NSString格式的數據轉換成json數據,利用IOS5自帶的json解析方法:
- NSString *str=[NSString stringWithFormat:@"https://alpha-api.app.net/stream/0/posts/stream/global"];
- NSURL *url = [NSURL URLWithString:[str stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
- NSURLRequest *request = [NSURLRequest requestWithURL:url];
- AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc]initWithRequest:request];
- [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, idresponseObject) {
- NSString *html = operation.responseString;
- NSData* data=[html dataUsingEncoding:NSUTF8StringEncoding];
- id dict=[NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
- NSLog(@"獲取到的數據爲:%@",dict);
- }failure:^(AFHTTPRequestOperation *operation, NSError *error) {
- NSLog(@"發生錯誤!%@",error);
- }];
- NSOperationQueue *queue = [[NSOperationQueue alloc] init];
- [queue addOperation:operation];
如果發生Error Domain=NSURLErrorDomain Code=-1000 "bad URL" UserInfo=0x14defc80 {NSUnderlyingError=0x14deea10 "bad URL", NSLocalizedDescription=bad URL這個錯誤,請檢查URL編碼格式。有沒有進行stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding
如何通過URL獲取圖片
異步獲取圖片,通過隊列實現,而且圖片會有緩存,在下次請求相同的鏈接時,系統會自動調用緩存,而不從網上請求數據。
- UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0.0f, 100.0f, 100.0f, 100.0f)]; [imageView setImageWithURL:[NSURL URLWithString:@"http://i.imgur.com/r4uwx.jpg"]placeholderImage:[UIImage imageNamed:@"placeholder-avatar"]]; [self.view addSubview:imageView];
- 上面的方法是官方提供的,還有一種方法,
- NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.scott-sherwood.com/wp-content/uploads/2013/01/scene.png"]];
- AFImageRequestOperation *operation = [AFImageRequestOperation imageRequestOperationWithRequest:request imageProcessingBlock:nil success:^(NSURLRequest *request, NSHTTPURLResponse*response, UIImage *image) {
- self.backgroundImageView.image = image;
- } failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error) {
- NSLog(@"Error %@",error);
- }];
- [operation start];
如果使用第一種URLWithString: placeholderImage:會有更多的細節處理,其實實現還是通過AFImageRequestOperation處理,可以點擊URLWithString: placeholderImage:方法進去看一下就一目瞭然了。所以我覺得還是用第一種好。
如何通過URL獲取plist文件
通過url獲取plist文件的內容,用的很少,這個方法在官方提供的方法裏面沒有
- NSString *weatherUrl = @"http://www.calinks.com.cn/buick/kls/Buickhousekeeper.plist";
- NSURL *url = [NSURL URLWithString:[weatherUrl stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
- NSURLRequest *request = [NSURLRequest requestWithURL:url];
- [AFPropertyListRequestOperation addAcceptableContentTypes:[NSSet setWithObject:@"text/plain"]];
- AFPropertyListRequestOperation *operation = [AFPropertyListRequestOperation propertyListRequestOperationWithRequest:request success:^(NSURLRequest *request,NSHTTPURLResponse *response, id propertyList) {
- NSLog(@"%@",(NSDictionary *)propertyList);
- }failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, idpropertyList) {
- NSLog(@"%@",error);
- }];
- [operation start];
如何通過URL獲取XML數據
xml解析使用AFXMLRequestOperation,需要實現蘋果自帶的NSXMLParserDelegate委託方法,XML中有一些不需要的協議格式內容,所以就不能像json那樣解析,還得實現委託。我之前有想過能否所有的XML鏈接用一個類處理,而且跟服務端做了溝通,結果很不方便,效果不好。XML大多標籤不同,格式也不固定,所以就有問題,使用json就要方便的多。
第一步;在.h文件中加入委託NSXMLParserDelegate
第二步;在.m文件方法中加入代碼
- NSURL *url = [NSURL URLWithString:@"http://113.106.90.22:5244/sshopinfo"];
- NSURLRequest *request = [NSURLRequest requestWithURL:url];
- AFXMLRequestOperation *operation =
- [AFXMLRequestOperation XMLParserRequestOperationWithRequest:request success:^(NSURLRequest*request, NSHTTPURLResponse *response, NSXMLParser *XMLParser) {
- XMLParser.delegate = self;
- [XMLParser setShouldProcessNamespaces:YES];
- [XMLParser parse];
- }failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, NSXMLParser*XMLParser) {
- NSLog(@"%@",error);
- }];
- [operation start];
第三步;在.m文件中實現委託方法
//在文檔開始的時候觸發
-
- (void)parserDidStartDocument:(NSXMLParser *)parser{
- NSLog(@"解析開始!");
- }
- //解析起始標記
- - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary*)attributeDict{
- NSLog(@"標記:%@",elementName);
- }
- //解析文本節點
- - (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{
- NSLog(@"值:%@",string);
- }
- //解析結束標記
- - (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName{
- NSLog(@"結束標記:%@",elementName);
- }
- //文檔結束時觸發
- -(void) parserDidEndDocument:(NSXMLParser *)parser{
- NSLog(@"解析結束!");
- }
運行的結果:
如何使用AFHTTPClient進行web service操作
- AFHTTPClient處理GET 和 POST請求.做網頁的朋友們這個方法用的比較多。在要經常調用某個請求時,可以封裝,節省資源。
- BaseURLString = @"http://www.raywenderlich.com/downloads/weather_sample/";
- NSURL *baseURL = [NSURL URLWithString:[NSString stringWithFormat:BaseURLString]];
- NSDictionary *parameters = [NSDictionary dictionaryWithObject:@"json" forKey:@"format"];
- AFHTTPClient *client = [[AFHTTPClient alloc] initWithBaseURL:baseURL];
- [client registerHTTPOperationClass:[AFJSONRequestOperation class]];
- [client setDefaultHeader:@"Accept" value:@"text/html"];
- [client postPath:@"weather.php" parameters:parameters success:^(AFHTTPRequestOperation*operation, id responseObject) {
- NSString* newStr = [[NSString alloc] initWithData:responseObjectencoding:NSUTF8StringEncoding];
- NSLog(@"POST請求:%@",newStr);
- }failure:^(AFHTTPRequestOperation *operation, NSError *error) {
- NSLog(@"%@",error);
- }];
- [client getPath:@"weather.php" parameters:parameters success:^(AFHTTPRequestOperation*operation, id responseObject) {
- NSString* newStr = [[NSString alloc] initWithData:responseObjectencoding:NSUTF8StringEncoding];
- NSLog(@"GET請求:%@",newStr);
- }failure:^(AFHTTPRequestOperation *operation, NSError *error) {
- NSLog(@"%@",error);
- }];
運行結果:
如果需要顯示網絡活動指示器,可以用下面方法:
- [AFNetworkActivityIndicatorManager sharedManager].enabled = YES;
Error: Error Domain=AFNetworkingErrorDomain Code=-1016 "Request failed: unacceptable content-type: text/html" UserInfo=0x16774de0 {NSErrorFailingURLKey=http://192.168.2.2:8181/ecar/tsp/uploadLocation?CID=781666&serviceType=1, AFNetworkingOperationFailinponseErrorKey= { URL: http://192.168.2.2:8181/ecar/tsp/uploadLocation?CID=781666&serviceType=1 } { status code: 200, headers {
XXX
} }, NSLocalizedDescription=Request failed: unacceptable content-type: text/html}
返回數據格式不對。註銷這句話: op.responseSerializer = [AFJSONResponseSerializerserializer];然後將返回的數據自己轉換。
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