ios中网络请求缓存

#import <Foundation/Foundation.h>
#import "ASIFormDataRequest.h"

@protocol NetWorkdelegate;
@interface JSNetWork : NSObject<ASIHTTPRequestDelegate>
+(JSNetWork *)shareNetWork;

-(void)JsNetWordWithConnectId:(int)connectid Body:(NSString *)body PostBody:(NSString *)PostBody Delegate:(id<NetWorkdelegate>)delegate;
@end

@protocol NetWorkdelegate <NSObject>
-(void)NetWorkwithConnectId:(int)connectid backstring:(NSString *)aback;
@end

@implementation JSNetWork

+(JSNetWork *)shareNetWork{
    static dispatch_once_t onceToken;
    static JSNetWork *netWork=nil;
    dispatch_once(&onceToken, ^{
        netWork=[[JSNetWork alloc] init];
    });
    return netWork;
}

#pragma mark -request
-(void)JsNetWordWithConnectId:(int)connectid Body:(NSString *)body PostBody:(NSString *)PostBody Delegate:(id<NetWorkdelegate>)delegate{
    if (![self Isconnect]) {
        UIAlertView *alertview=[[UIAlertView alloc] initWithTitle:nil message:@"not work" delegate:self cancelButtonTitle:@"ok" otherButtonTitles: nil];
        [alertview show];
        [alertview release];
        return;
    }
    ASIFormDataRequest *request=[ASIFormDataRequest requestWithURL:[NSURL URLWithString:body]];
    request.timeOutSeconds=;
    request.delegate=self;
      request.requestMethod=@"POST";
      NSArray *Bodyarry=[PostBody componentsSeparatedByString:@"&"];
for(NSString *tmp in Bodyarry){
    NSArray *temparrary=[tmp componentsSeparatedByString:@"="];
    [request setPostValue:temparrary[] forKey:temparrary[]];
}
NSString *cid=[NSString stringWithFormat:@"%zi",connectid];
NSDictionary *dic=@{@"connectid":cid,@"delegate":delegate};
[request setUserInfo:dic];
[request startAsynchronous];

}

-(void)requestFinished:(ASIHTTPRequest *)request{
    NSDictionary *userinfo=request.userInfo;
    int connectid=[userinfo[@"connectid"] intValue];
    id<NetWorkdelegate> delegate=userinfo[@"delegate"];
    NSString *str=[request responseString];
    [delegate NetWorkwithConnectId:connectid backstring:str];
}

-(void)requestFailed:(ASIHTTPRequest *)request{

}

-(BOOL)Isconnect{
    BOOL iscon=NO;
    Reachability *r=[Reachability reachabilityWithHostName:@"www.baidu.com"];
    switch ([r currentReachabilityStatus]) {
        case NotReachable:
            NSLog(@"not network");
            iscon=NO;
            break;
            case ReachableViaWiFi:
            NSLog(@"wifi");
            iscon=YES;
            break;
            case ReachableViaWWAN:
            NSLog(@"3g");
            iscon=YES;
            break;
        default:
            break;
    }
    return iscon;
}

@end

- (void)viewDidLoad
{
    [super viewDidLoad];
    [[JSNetWork shareNetWork] JsNetWordWithConnectId: Body:@"http://www.baidu.com" PostBody:nil Delegate:self];
    // Do any additional setup after loading the view, typically from a nib.
    NSString *path=[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
    path=[path stringByAppendingPathComponent:@"1.plist"];
    NSString *str=[NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];
    if(str.length>)
    [self NetWorkwithConnectId: backstring:str];
}

-(void)NetWorkwithConnectId:(int)connectid backstring:(NSString *)aback{
    self.txt.text=aback;
    [self Save:aback];
}

-(void)Save:(NSString *)str{
    NSString *path=[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
    path=[path stringByAppendingPathComponent:@"1.plist"];
    [str writeToFile:path atomically:YES encoding:NSUTF8StringEncoding error:nil];
}

- (void)dealloc {
    [_txt release];
    [super dealloc];
}