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或者以後的版本須要xcode5.0版本而且只能爲IOS6或更高的手機系統上運行,若是開發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。php
NSString *str=[NSString stringWithFormat:@"https://alpha-api.app.net/stream/0/posts/stream/global"];html
NSURL *url = [NSURL URLWithString:[str stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];nginx
NSURLRequest *request = [NSURLRequest requestWithURL:url];git
// 從URL獲取json數據github
AFJSONRequestOperation *operation1 = [AFJSONRequestOperation JSONRequestOperationWithRequest:requestsuccess:^(NSURLRequest *request, NSHTTPURLResponse *response, NSDictionary* JSON) {web
NSLog(@"獲取到的數據爲:%@",JSON);json
} failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id data) {api
NSLog(@"發生錯誤!%@",error);xcode
}];緩存
[operation1 start];
第二種方法,利用AFHTTPRequestOperation 先獲取到字符串形式的數據,而後轉換成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, id responseObject) {
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];
若是發生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
如何經過URL獲取圖片
異步獲取圖片,經過隊列實現,並且圖片會有緩存,在下次請求相同的連接時,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];
若是使用第一種URLWithString: placeholderImage:會有更多的細節處理,其實實現仍是經過AFImageRequestOperation處理,能夠點擊URLWithString: placeholderImage:方法進去看一下就一目瞭然了。因此我以爲仍是用第一種好。
如何經過URL獲取plist文件
經過url獲取plist文件的內容,用的不多,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, id propertyList) {
NSLog(@"%@",error);
}];
[operation start];
若是稍不留神,可能就出現Error Domain=AFNetworkingErrorDomain Code=-1016 "Expected content type {(
"application/x-plist"
)}, got text/plain" UserInfo=0x16e91ce0 {NSLocalizedRecoverySuggestion=
...
...
, AFNetworkingOperationFailingURLRequestErrorKey= { }, NSErrorFailingURLKey=, NSLocalizedDescription=Expected content type {(
"application/x-plist"
)}, got text/plain, AFNetworkingOperationFailinponseErrorKey= { URL: } { status code: 200, headers {
"Accept-Ranges" = bytes;
Connection = "keep-alive";
"Content-Length" = 974;
"Content-Type" = "text/plain";
Date = "Sat, 25 Jan 2014 07:29:26 GMT";
Etag = ""1014c2-3ce-4ee63e1c80e00"";
"Last-Modified" = "Wed, 25 Dec 2013 23:04:24 GMT";
Server = "nginx/1.4.2";
} }}
可能還會出現亂碼,解決辦法就是[AFPropertyListRequestOperation addAcceptableContentTypes:[NSSet setWithObject:@"text/plain"]];
如何經過URL獲取XML數據
xml解析使用AFXMLRequestOperation,須要實現蘋果自帶的NSXMLParserDelegate委託方法,XML中有一些不須要的協議格式內容,因此就不能像json那樣解析,還得實現委託。我以前有想過可否全部的XML連接用一個類處理,並且跟服務端作了溝通,結果很不方便,效果很差。XML大多標籤不一樣,格式也不固定,因此就有問題,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!");
}
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:responseObject encoding:NSUTF8StringEncoding];
NSLog(@"POST請求:%@",newStr);
}failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(@"%@",error);
}];
[client getPath:@"weather.php" parameters:parameters success:^(AFHTTPRequestOperation *operation, idresponseObject) {
NSString* newStr = [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding];
NSLog(@"GET請求:%@",newStr);
}failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(@"%@",error);
}];
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];而後將返回的數據本身轉換。