抽個(gè)時(shí)間總結(jié)一下微信支付；

• 需要和微信申請(qǐng)APPID然后審核 （300塊大洋）

• 首先從官網(wǎng)上下載一個(gè)demo[網(wǎng)址]（https://open.weixin.qq.com/cgi-bin/showdocument?action=dir_list&t=resource/res_list&verify=1&id=1417694084&token=1b41037aa554145bdb95b7430eb139850a46b1d7&lang=zh_CN）；

• 如果你用模擬器運(yùn)行這個(gè)demo是看不到什么效果的，要用真機(jī)調(diào)試；

• 根據(jù)demo中的示例，將支付代碼提取出來(lái)；

  
  
  
  
  
  
  
  
  
  

在AppDelegate中注冊(cè)

在-(BOOL)application:didFinishLaunchingWithOptions:launchOptions中注冊(cè)：

[WXApi registerApp:@"wxb4ba3c02aa476ea1" withDescription:nil];

配置應(yīng)用間跳轉(zhuǎn)的URL：

點(diǎn)擊支付

        NSString *res = [WXplay jumpToBizPay];
        if( ![@"" isEqual:res] ){
            UIAlertView *alter = [[UIAlertView alloc] initWithTitle:@"支付失敗" message:res delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
            [alter show];
            [alter release];
        }

WXplay.m

+ (NSString *)jumpToBizPay {
    
    //============================================================
    // V3&V4支付流程實(shí)現(xiàn)
    // 注意:參數(shù)配置請(qǐng)查看服務(wù)器端Demo
    // 更新時(shí)間：2015年11月20日
    //============================================================
    NSString *urlString   = @"http://wxpay.weixin.qq.com/pub_v2/app/app_pay.php?plat=ios";
    //解析服務(wù)端返回json數(shù)據(jù)
    NSError *error;
    //加載一個(gè)NSURL對(duì)象
    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:urlString]];
    //將請(qǐng)求的url數(shù)據(jù)放到NSData對(duì)象中
    NSData *response = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
    if ( response != nil) {
        NSMutableDictionary *dict = NULL;
        //IOS5自帶解析類(lèi)NSJSONSerialization從response中解析出數(shù)據(jù)放到字典中
        dict = [NSJSONSerialization JSONObjectWithData:response options:NSJSONReadingMutableLeaves error:&error];
        
        NSLog(@"url:%@",urlString);
        if(dict != nil){
            NSMutableString *retcode = [dict objectForKey:@"retcode"];
            if (retcode.intValue == 0){
                NSMutableString *stamp  = [dict objectForKey:@"timestamp"];
                
                //調(diào)起微信支付
                PayReq* req             = [[[PayReq alloc] init]autorelease];
                req.partnerId           = [dict objectForKey:@"partnerid"]; // 商戶(hù)號(hào)
                req.prepayId            = [dict objectForKey:@"prepayid"];// 預(yù)支付交易會(huì)話(huà)ID
                req.nonceStr            = [dict objectForKey:@"noncestr"];//隨機(jī)字符串
                req.timeStamp           = stamp.intValue; //時(shí)間戳
                req.package             = [dict objectForKey:@"package"];//Sign=WXPay
                req.sign                = [dict objectForKey:@"sign"];//簽名
                [WXApi sendReq:req];
                //日志輸出
//                NSLog(@"appid=%@\npartid=%@\nprepayid=%@\nnoncestr=%@\ntimestamp=%ld\npackage=%@\nsign=%@",[dict objectForKey:@"appid"],req.partnerId,req.prepayId,req.nonceStr,(long)req.timeStamp,req.package,req.sign );
                return @"";
            }else{
                return [dict objectForKey:@"retmsg"];
            }
        }else{
            return @"服務(wù)器返回錯(cuò)誤，未獲取到j(luò)son對(duì)象";
        }
    }else{
        return @"服務(wù)器返回錯(cuò)誤";
    }
}

WXApiManager 需要遵守 WXApiDelegate

實(shí)現(xiàn)單例：

+(instancetype)sharedManager {
    static dispatch_once_t onceToken;
    static WXApiManager *instance;
    dispatch_once(&onceToken, ^{
        instance = [[WXApiManager alloc] init];
    });
    return instance;
}

WXApiDelegate代理方法的實(shí)現(xiàn)

• 實(shí)現(xiàn)onResp方法、完成支付后，微信app會(huì)返回到商家app頁(yè)面，并且回調(diào)onResp函數(shù)，開(kāi)發(fā)者需要在該方法中接收通知，判斷返回碼，如果支付成功則去后臺(tái)查詢(xún)支付結(jié)果再展示給用戶(hù)實(shí)際支付結(jié)果

-(void)onResp:(BaseResp *)resp {
  if([resp isKindOfClass:[PayResp class]]){
        //支付返回結(jié)果，實(shí)際支付結(jié)果需要去微信服務(wù)器端查詢(xún)
        NSString *strMsg,*strTitle = [NSString stringWithFormat:@"支付結(jié)果"];
        switch (resp.errCode) {
            case WXSuccess:
                // 在此顯示支付結(jié)果數(shù)據(jù)（從服務(wù)器獲?。?                strMsg = @"支付結(jié)果：成功！";
                NSLog(@"支付成功－PaySuccess，retcode = %d", resp.errCode);
                break;
            default:
                strMsg = [NSString stringWithFormat:@"支付結(jié)果：失??！retcode = %d, retstr = %@", resp.errCode,resp.errStr];
                NSLog(@"錯(cuò)誤，retcode = %d, retstr = %@", resp.errCode,resp.errStr);
                break;
        }
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:strTitle message:strMsg delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
        [alert show];
        [alert release];
    }
}