#import <Foundation/Foundation.h>#import <UIKit/UIKit.h>#import "Reachability.h"@interface HttpHelper : NSObject+ (BOOL)NetWorkIsOK;//检查网络是否可用+ (void)post:(NSString *)Url RequestParams:(NSDictionary *)params FinishBlock:(void (^)(NSURLResponse *response, NSData *data, NSError *connectionError)) block;//post请求封装@end

　　接下来是实现文件

//  HttpHelper.m#import "HttpHelper.h"@implementation HttpHelper//这个函数是判断网络是否可用的函数（wifi或者蜂窝数据可用，都返回YES）+ (BOOL)NetWorkIsOK{    if(       ([[Reachability reachabilityForInternetConnection] currentReachabilityStatus]       != NotReachable)       &&       ([[Reachability reachabilityForLocalWiFi] currentReachabilityStatus]       != NotReachable)       ){        return YES;    }else{        return NO;    }}//post异步请求封装函数+ (void)post:(NSString *)URL RequestParams:(NSDictionary *)params FinishBlock:(void (^)(NSURLResponse *response, NSData *data, NSError *connectionError)) block{    //把传进来的URL字符串转变为URL地址    NSURL *url = [NSURL URLWithString:URL];    //请求初始化，可以在这针对缓存，超时做出一些设置    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url                                                           cachePolicy:NSURLRequestReloadIgnoringCacheData                                                       timeoutInterval:20];    //解析请求参数，用NSDictionary来存参数，通过自定义的函数parseParams把它解析成一个post格式的字符串    NSString *parseParamsResult = [self parseParams:params];    NSData *postData = [parseParamsResult dataUsingEncoding:NSUTF8StringEncoding];        [request setHTTPMethod:@"POST"];    [request setHTTPBody:postData];        //创建一个新的队列（开启新线程）    NSOperationQueue *queue = [NSOperationQueue new];    //发送异步请求，请求完以后返回的数据，通过completionHandler参数来调用    [NSURLConnection sendAsynchronousRequest:request                                       queue:queue                           completionHandler:block];//    return result;}//把NSDictionary解析成post格式的NSString字符串+ (NSString *)parseParams:(NSDictionary *)params{    NSString *keyValueFormat;    NSMutableString *result = [NSMutableString new];    //实例化一个key枚举器用来存放dictionary的key    NSEnumerator *keyEnum = [params keyEnumerator];    id key;    while (key = [keyEnum nextObject]) {        keyValueFormat = [NSString stringWithFormat:@"%@=%@&",key,[params valueForKey:key]];        [result appendString:keyValueFormat];        NSLog(@"post()方法参数解析结果：%@",result);    }    return result;}@end

就是这么简单。下面用登录的例子给大家演示一下是怎么用的。

- (void)login{     NSString *url = @"127.0.0.1/login.php";    NSString *userName = @"admin";    NSString *password =  @"root";    //加入参数    NSMutableDictionary *params = [NSMutableDictionary new];    [params setValue:userName forKey:@"phone"];    [params setValue:password forKey:@"password"];    //有网络才发送请求    if([HttpHelper NetWorkIsOK]){     //发送请求，并且得到返回的数据    [HttpHelper post:url RequestParams:params FinishBlock:^(NSURLResponse *response, NSData *data, NSError *connectionError) {    　　//传回来的数据存在，则执行改回调甘薯    　　if(data){    　　//子线程通知主线程更新UI，selector中是要执行的函数，data是传给这个函数的参数    　　//login_callBack就处理返回来的消息，这里就简单的输出，登录成功     　　[self performSelectorOnMainThread:@selector(login_callBack:) withObject:data waitUntilDone:YES];     　　}else{     　　    NSLog(@"无效的数据");     　　}         　　}];　　}}//登录的回调函数，首先判断接收的值是不是能登录。若不能，则提示用户。若能登录，则处理segue来跳转界面- (void)login_callBack:(id)value{        NSLog(@"登录成功");}

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