首先得下载AFNetworking库文件,下载时得首先弄清楚,你将要开发的软件兼容的最低版本是多少。AFNetworking2.0或者之后的版本需要xcode5.0版本并且只能为IOS6或更高的手机系统上运行,如果开发MAC程序,那么2.0版本只能在MACOS
X 10.8或者更高的版本上运行。
NSString *str=[NSString stringWithFormat:@"https://alpha-api.app.net/stream/0/posts/stream/global"];
NSURL *url =[NSURL URLWithString:[strstringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
NSURLRequest *request = [NSURLRequestrequestWithURL:url];
// 从URL获取json数据
AFJSONRequestOperation *operation1 = [AFJSONRequestOperationJSONRequestOperationWithRequest:request success:^(NSURLRequest *request,NSHTTPURLResponse *response, NSDictionary*
JSON) {
NSLog(@"获取到的数据为:%@",JSON);
} failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id data)
{
NSLog(@"发生错误!%@",error);
}];
[operation1 start];
第二种方法,利用AFHTTPRequestOperation 先获取到字符串形式的数据,然后转换成json格式,将NSString格式的数据转换成json数据,利用IOS5自带的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 =[[AFHTTPRequestOperationalloc] initWithRequest:request];
[operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject)
{
NSString*html = operation.responseString;
NSData* data=[html dataUsingEncoding:NSUTF8StringEncoding];
id dict=[NSJSONSerialization JSONObjectWithData:dataoptions:0 error:nil];
NSLog(@"获取到的数据为:%@",dict);
}failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(@"发生错误!%@",error);
}];
NSOperationQueue *queue = [[NSOperationQueuealloc] init];
[queue addOperation:operation];
如果发生Error Domain=NSURLErrorDomain Code=-1000 "bad URL"UserInfo=0x14defc80 {NSUnderlyingError=0x14deea10 "bad URL",NSLocalizedDescription=bad URL这个错误,请检查URL编码格式。有没有进行stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding
如何通过URL获取图片
异步获取图片,通过队列实现,而且图片会有缓存,在下次请求相同的链接时,系统会自动调用缓存,而不从网上请求数据。
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,还有一种方法,
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURLURLWithString:@"http://www.scott-sherwood.com/wp-content/uploads/2013/01/scene.png"]];
AFImageRequestOperation *operation = [AFImageRequestOperationimageRequestOperationWithRequest:requestimageProcessingBlock:nilsuccess:^(NSURLRequest*request, NSHTTPURLResponse*response, UIImage *image)
{
self.backgroundImageView.image = image;
} failure:^(NSURLRequest*request, NSHTTPURLResponse*response, NSError *error)
{
NSLog(@"Error%@",error);
}];
[operation start];
如果使用第一种URLWithString: placeholderImage:会有更多的细节处理,其实实现还是通过AFImageRequestOperation处理,可以点击URLWithString: placeholderImage:方法进去看一下就一目了然了。所以我觉得还是用第一种好。
如何通过URL获取plist文件
通过url获取plist文件的内容,用的很少,这个方法在官方提供的方法里面没有
NSString *weatherUrl =@"http://www.calinks.com.cn/buick/kls/Buickhousekeeper.plist";
NSURL *url =[NSURL URLWithString:[weatherUrlstringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
NSURLRequest *request = [NSURLRequestrequestWithURL:url];
[AFPropertyListRequestOperationaddAcceptableContentTypes:[NSSet setWithObject:@"text/plain"]];
AFPropertyListRequestOperation*operation =[AFPropertyListRequestOperationpropertyListRequestOperationWithRequest:requestsuccess:^(NSURLRequest *request, NSHTTPURLResponse *response, id propertyList)
{
NSLog(@"%@",(NSDictionary *)propertyList);
}failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id propertyList)
{
NSLog(@"%@",error);
}];
[operation start];
如果稍不留神,可能就出现ErrorDomain=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 07:29:26GMT";
Etag =""1014c2-3ce-4ee63e1c80e00"";
"Last-Modified" = "Wed, 25 Dec 2013 23:04:24GMT";
Server = "nginx/1.4.2";
} }}
可能还会出现乱码,解决办法就是[AFPropertyListRequestOperation addAcceptableContentTypes:[NSSet setWithObject:@"text/plain"]];
如何通过URL获取XML数据
xml解析使用AFXMLRequestOperation,需要实现苹果自带的NSXMLParserDelegate委托方法,XML中有一些不需要的协议格式内容,所以就不能像json那样解析,还得实现委托。我之前有想过能否所有的XML链接用一个类处理,而且跟服务端做了沟通,结果很不方便,效果不好。XML大多标签不同,格式也不固定,所以就有问题,使用json就要方便的多。
第一步;在.h文件中加入委托NSXMLParserDelegate
第二步;在.m文件方法中加入代码
NSURL*url = [NSURLURLWithString:@"http://113.106.90.22:5244/sshopinfo"];
NSURLRequest *request = [NSURLRequestrequestWithURL:url];
AFXMLRequestOperation *operation =
[AFXMLRequestOperationXMLParserRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response,NSXMLParser *XMLParser)
{
XMLParser.delegate = self;
[XMLParsersetShouldProcessNamespaces:YES];
[XMLParser parse];
}failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, NSXMLParser *XMLParser)
{
NSLog(@"%@",error);
}];
[operation start];
第三步;在.m文件中实现委托方法
//在文档开始的时候触发
-(void)parserDidStartDocument:(NSXMLParser *)parser{
NSLog(@"解析开始!");
}
//解析起始标记
- (void)parser:(NSXMLParser *)parserdidStartElement:(NSString*)elementName namespaceURI:(NSString *)namespaceURIqualifiedName:(NSString*)qNameattributes:(NSDictionary*)attributeDict{
NSLog(@"标记:%@",elementName);
}
//解析文本节点
- (void)parser:(NSXMLParser *)parserfoundCharacters:(NSString*)string{
NSLog(@"值:%@",string);
}
//解析结束标记
- (void)parser:(NSXMLParser *)parserdidEndElement:(NSString*)elementName namespaceURI:(NSString *)namespaceURIqualifiedName:(NSString*)qName{
NSLog(@"结束标记:%@",elementName);
}
//文档结束时触发
-(void)parserDidEndDocument:(NSXMLParser *)parser{
NSLog(@"解析结束!");
}
运行的结果:
如何使用AFHTTPClient进行web service操作
BaseURLString =@"http://www.raywenderlich.com/downloads/weather_sample/";
NSURL*baseURL = [NSURLURLWithString:[NSStringstringWithFormat:BaseURLString]];
NSDictionary *parameters = [NSDictionarydictionaryWithObject:@"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请求:%@",newStr);
}failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(@"%@",error);
}];
[client getPath:@"weather.php" parameters:parameters success:^(AFHTTPRequestOperation *operation,id responseObject)
{
NSString* newStr = [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding];
NSLog(@"GET请求:%@",newStr);
}failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(@"%@",error);
}];
运行结果:
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: unacceptablecontent-type: text/html}
返回数据格式不对。注销这句话: op.responseSerializer= [AFJSONResponseSerializer serializer];然后将返回的数据自己转换。
原文转之:http://blog.sina.com.cn/s/blog_68661bd80101r1xz.html