Iphone 试图将NSURLConnection函数分离到另一个类中，但在委派时出错

我想创建一个MVC iphone应用程序，我的应用程序任务的一部分是从互联网获取数据，我想把这部分分离到一个模型中，下面是我写的

//Connection.h
#import <Foundation/Foundation.h>


@interface Connection : NSObject 
{
    NSMutableData * rawData;
    BOOL ready;
}


-(id) initWithData;
-(BOOL) isDataReady;

@end


//Connection.m
#import "Connection.h"


@implementation Connection

-(id) initWithData
{
    self = [super init];
    if(self != nil)
    {
        ready = NO;
        rawData = [[NSMutableData alloc]init];
        NSString * urlString = [NSString stringWithString:@"http://www.google.com"];
        NSURLRequest * request = [NSURLRequest requestWithURL:[NSURL URLWithString:urlString]];
        [[NSURLConnection alloc] initWithRequest:[request delegate:self]];

        [rawData setLength:0];

        return self;
    }
    else {
        return nil;
    }
}
//I have implemented the connectiondidRecievedData and connectionDidFinishLoading also they are empty

错误是

2012-01-13 15:26:59.453 TestApp[20105:207]-[NSURLRequest委托：]： 已将无法识别的选择器发送到实例0x4e1f520 2012-01-13 15:26:59.455 TestApp[20105:207]*由于未捕获而终止应用程序 异常“NSInvalidArgumentException”，原因：'-[NSURLRequest 委托：：无法识别的选择器已发送到实例0x4e1f520' *第一次抛出时调用堆栈：（0 CoreFoundation 0x00dd05a9异常预处理+185 1 libobjc.A.dylib
0x00f24313 objc_异常_抛出+44 2 CoreFoundation
0x00dd20bb-[NSObject（NSObject）不识别选择器：][187 3
CoreFoundation 0x00d41966 uuu转发+966 4芯基础0x00d41522 _CF_forwarding_prep_0+50 5 TestApp 0x0000257c-[Connection initWithData]+339 6 TestApp
0x000020c3-[TestAppViewController doTestB]+122 7 UIKit
0x002c04fd-[UIApplication sendAction:to:from:forEvent:+119 8
UIKit 0x00350799-[UIControl 发送操作：发送到：forEvent:+67 9 UIKit
0x00352c2b-[UIControl（内部）\u发送操作预防：带事件：]+ 527 10 UIKit 0x003517d8-[UIControl touchesEnded:withEvent:+458 11 UIKit
0x002E4ED-[UIWindow\u sendTouchesForEvent:+567 12 UIKit
0x002c5c37-[UIApplication sendEvent:+447 13 UIKit
0x002caf2e\u UIApplicationHandleEvent+7576 14图形服务
0x01728992 PurpleEventCallback+1550 15芯基础
0x00db1944CFRUNLOOP\u正在调用\u OUT\u到\u A\u SOURCE1\u PERFORM\u函数 +52 16 CoreFoundation 0x00d11cf7\uuu CFRunLoopDoSource1+215 17 CoreFoundation 0x00d0ef83\uuuu CFRunLoopRun+979 18 CoreFoundation
0x00d0e840 CFRunLoopRunSpecific+208 19核心基础
0x00d0e761 CFRUNLOOPSRUNINMODE+97 20图形服务
0x017271c4 GSEventRunModal+21721图形服务
0x01727289 GSEventRun+115 22 UIKit
0x002CE93 UIApplicationMain+1160 23测试PP
0x00001e04主+102 24测试PP
0x00001d95 start+53）在抛出的实例后调用终止 “NSException”

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如何将NSURLConnection分离到另一个类？

此处的代码中有一个错误：

[[NSURLConnection alloc] initWithRequest:[request delegate:self]];

应改为：

[[NSURLConnection alloc] initWithRequest:request delegate:self];

---

您的代码中有一个错误：

[[NSURLConnection alloc] initWithRequest:[request delegate:self]];

应改为：

[[NSURLConnection alloc] initWithRequest:request delegate:self];