Objective-c 异步发送Post请求的工具类

原文链接iOS开发——post异步网络请求封装

有改动

HttpUtil.h

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
#import "Reachability.h"

@interface HttpUtil : 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

HttpUtil.m

#import "HttpUtil.h"

@implementation HttpUtil

+ (BOOL)NetWorkIsOK{
    //检查网络是否可用
    if(
       ([[Reachability reachabilityForInternetConnection] currentReachabilityStatus]
        != NotReachable)
       &&
       ([[Reachability reachabilityForLocalWiFi] currentReachabilityStatus]
        != NotReachable)
       ){
        return YES;
    }else{
        return NO;
    }
}
+ (void)post:(NSString *)Url RequestParams:(NSDictionary *)params FinishBlock:(void (^)(NSURLResponse *response, NSData *data, NSError *connectionError)) block{
//post请求封装

    //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

调用演示如下

 if([HttpUtil NetWorkIsOK]){
            //发送请求，并且得到返回的数据
            //ValueUtil是我保存接口URL的类
            [HttpUtil post:[ValueUtil getLoginURL] RequestParams:params FinishBlock:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
                //传回来的数据存在，则执行该回调函数
                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");
                }
            }];
        }

- (void)login_callBack:(id)value{
    NSLog(@"登录成功");
    NSData *data = (NSData *)value;
    NSString *result = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
    NSLog(result);
}