iOS中使用block进行网络请求回调

iOSliang 2014-06-23

转自:http://www.tuicool.com/articles/JFRfmq

//

//HttpRequest.h

//UseBlockCallBack

//

//CreatedbyMichaelon2/13/14.

//Copyright(c)2014EIMS.Allrightsreserved.

//

#import<Foundation/Foundation.h>

typedefvoid(^FinishBlock)(NSString*dataString);

@interfaceHttpRequest:NSObject<NSURLConnectionDataDelegate>

@property(strong,nonatomic)NSMutableData*resultData;

@property(strong,nonatomic)FinishBlockfinishBlock;

+(void)postRequestWithURL:(NSString*)urlStr

paramters:(NSString*)paramters

finshedBlock:(FinishBlock)block;

@end

-----------------------------------------------------------------------

//

//HttpRequest.m

//UseBlockCallBack

//

//CreatedbyMichaelon2/13/14.

//Copyright(c)2014EIMS.Allrightsreserved.

//

#import"HttpRequest.h"

@implementationHttpRequest

+(void)postRequestWithURL:(NSString*)urlStr

paramters:(NSString*)paramters

finshedBlock:(FinishBlock)block

{

HttpRequest*httpRequest=[[HttpRequestalloc]init];

httpRequest.finishBlock=block;

NSURL*url=[NSURLURLWithString:urlStr];

NSMutableURLRequest*requset=[[NSMutableURLRequestalloc]initWithURL:urlcachePolicy:NSURLRequestUseProtocolCachePolicytimeoutInterval:30];

[requsetsetHTTPBody:[paramtersdataUsingEncoding:NSUTF8StringEncoding]];

NSURLConnection*connection=[[NSURLConnectionalloc]initWithRequest:requsetdelegate:httpRequest];

NSLog(connection?@"连接创建成功":@"连接创建失败");

}

/**

*接收到服务器回应的时回调

*/

-(void)connection:(NSURLConnection*)connectiondidReceiveResponse:(NSURLResponse*)response

{

NSHTTPURLResponse*httpResponse=(NSHTTPURLResponse*)response;

if(!self.resultData){

self.resultData=[[NSMutableDataalloc]init];

}else{

[self.resultDatasetLength:0];

}

if([responserespondsToSelector:@selector(allHeaderFields)]){

NSDictionary*dic=[httpResponseallHeaderFields];

NSLog(@"[network]allHeaderFields:%@",[dicdescription]);

}

}

/**

*接收到服务器传输数据的时候调用,此方法根据数据大小执行若干次

*/

-(void)connection:(NSURLConnection*)connectiondidReceiveData:(NSData*)data

{

[self.resultDataappendData:data];

}

/**

*数据传完之后调用此方法

*/

-(void)connectionDidFinishLoading:(NSURLConnection*)connection

{

NSString*resultStr=[[NSStringalloc]initWithData:self.resultData

encoding:NSUTF8StringEncoding];

if(self.finishBlock){

self.finishBlock(resultStr);

}

}

/**

*网络请求过程中,出现任何错误(断网,连接超时等)会进入此方法

*/

-(void)connection:(NSURLConnection*)connectiondidFailWithError:(NSError*)error

{

NSLog(@"networkerror:%@",[errorlocalizedDescription]);

if(self.finishBlock){

self.finishBlock(nil);

}

}

@end

-----------------------------------------------------------------------

[HttpRequestpostRequestWithURL:@"http://www.baidu.com"

paramters:@""

finshedBlock:^(NSString*dataString){

NSLog(@"finishcallbackblock,result:%@",dataString);

}];

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