iOS 集成微信支付【转载】

      目前项目里有微信支付的需求，调研过一段时间后，发现其实并没有想象中的那么困难。如果你只是想实现该功能，一个方法足以，但是若你想深入了解实现原理。就需要花费更多的功夫了。目前我只清楚微信支付需要做签名，一种是在后台签名，一种是自己在前端签名。其实这对前端来说代码量并没有多大的改变，最大的区别是在后台签名逻辑更容易理解，而在前端签名逻辑有些混乱。

小技巧：我在项目中集成类似的第三方功能时，如果需要对delegate进行操作，我会为这个功能，单独创建一个category类，这样避免项目出现多个第三方功能后，delegate里的代码十分混乱。

 微信支付开发文档     http://mch.weixin.qq.com/wiki/doc/api/app.php?chapter=8_1   

正文：

微信支付用到的文件 

  

PS： 如果你在app内集成了微信分享功能，在分享的那个框架里，都能找到这些文件的，所以不需要在下载，直接用就行。

 2.设置URL types

 

3、在Appdelegate中注册微信支付，我个人建议将注册后的内容输出一下，以便查看是否注册成功。

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

 

    [WXApi registerApp:@"你的key值" withDescription:@"你的描述信息"];

    
    BOOL isSuccess = [WXApi registerApp:@"你的key值" withDescription:@"你的描述信息"];

    return YES;
}

 4.微信回调

//处理微信通过URL启动App时传递的数据

- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation {
    
    return [WXApi handleOpenURL:url delegate:self];
}

//微信回调
- (void)onResp:(BaseResp *)resp {
    //errCode
    switch (resp.errCode) {
        case WXSuccess:
            //成功回调
            break;
        default:
            break;
    }
}

 5.调用微信支付（主要代码，后台签名）

     PayReq* req = [[PayReq alloc] init];
        
        req.partnerId   = dict[@"entity"][@"partnerid"]; //商户号
        req.prepayId    = dict[@"entity"][@"prepayid"];  //预支付交易会话
        req.nonceStr    = dict[@"entity"][@"noncestr"];  //随机字符串
        
        req.timeStamp   = [dict[@"entity"][@"timestamp"] intValue]; //时间戳
        req.package     = dict[@"entity"][@"package"];  //扩展字段
        req.sign        = dict[@"entity"][@"sign"];  //签名
        
        NSNumber *payOrder = dict[@"entity"][@"outTradeNo"];
        
        SAVEUSERDEFAULT(payOrder, @"订单号");
        
        
        //这一点坑比较大，在微信的官方文档里，有两种申请调用微信支付的方法sendReq和safeSendReq（安全方式）,这两个方法不能确定什么时候哪个管用，我这里的解决办法就是这个不行换另一个。哈哈
        [WXApi safeSendReq:req];
        
        DLog(@"微信支付==%d",[WXApi sendReq:req]);

 6.如果要在程序签名（这部分的有些难理解，我自己还没有理解透，有机会研究一下，在更新）

#import "ViewController.h"
#import "payRequsestHandler.h"
#import "WXApi.h"

@interface ViewController () {
    enum WXScene _scene;
    NSString *Token;
    long token_time;
}

@end

@implementation ViewController

- (instancetype)init
{
    self = [super init];
    if (self) {
        _scene = WXSceneSession;
    }
    token_time = 0;
    return self;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    //向微信注册
    
    
    //微信支付
    UIButton *but2 = [[UIButton alloc]initWithFrame:CGRectMake(200, 100, 100, 40)];
    [but2 setTitle:@"微信支付" forState:UIControlStateNormal];
    but2.backgroundColor = [UIColor lightGrayColor];
    [but2 addTarget:self action:@selector(wxpay) forControlEvents:UIControlEventTouchUpInside];
    [but2 setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    [self.view addSubview:but2];
    
}

//微信支付
- (void)wxpay
{
    //商户号
    NSString *PARTNER_ID    = @"1900000109";
    //商户密钥
    NSString *PARTNER_KEY   = @"8934e7d15453e97507ef794cf7b0519d";
    //APPID
    NSString *APPI_ID       = @"wxd930ea5d5a258f4f";
    //appsecret
    NSString *APP_SECRET    = @"db426a9829e4b49a0dcac7b4162da6b6";
    //支付密钥
    NSString *APP_KEY       = @"L8LrMqqeGRxST5reouB0K66CaYAWpqhAVsq7ggKkxHCOastWksvuX1uvmvQclxaHoYd3ElNBrNO2DHnnzgfVG9Qs473M3DTOZug5er46FhuGofumV8H2FVR9qkjSlC5K";
    
    //支付结果回调页面
    NSString *NOTIFY_URL    = @"http://localhost/pay/wx/notify_url.asp";
    //订单标题
    NSString *ORDER_NAME    = @"Ios客户端签名支付 测试";
    //订单金额,单位（分）
    NSString *ORDER_PRICE   = @"1";
    
    //创建支付签名对象
    payRequsestHandler *req = [payRequsestHandler alloc];
    //初始化支付签名对象
    [req init:APPI_ID app_secret:APP_SECRET partner_key:PARTNER_KEY app_key:APP_KEY];
    
    //判断Token过期时间，10分钟内不重复获取,测试帐号多个使用，可能造成其他地方获取后不能用，需要即时获取
    time_t  now;
    time(&now);
    //if ( (now - token_time) > 0 )//非测试帐号调试请启用该条件判断
    {
        //获取Token
        Token                   = [req GetToken];
        //设置Token有效期为10分钟
        token_time              = now + 600;
        //日志输出
        NSLog(@"获取Token： %@
",[req getDebugifo]);
    }
    if ( Token != nil){
        //================================
        //预付单参数订单设置
        //================================
        NSMutableDictionary *packageParams = [NSMutableDictionary dictionary];
        [packageParams setObject: @"WX"                                             forKey:@"bank_type"];
        [packageParams setObject: ORDER_NAME                                        forKey:@"body"];
        [packageParams setObject: @"1"                                              forKey:@"fee_type"];
        [packageParams setObject: @"UTF-8"                                          forKey:@"input_charset"];
        [packageParams setObject: NOTIFY_URL                                        forKey:@"notify_url"];
        [packageParams setObject: [NSString stringWithFormat:@"%ld",time(0)]        forKey:@"out_trade_no"];
        [packageParams setObject: PARTNER_ID                                        forKey:@"partner"];
        [packageParams setObject: @"196.168.1.1"                                    forKey:@"spbill_create_ip"];
        [packageParams setObject: ORDER_PRICE                                       forKey:@"total_fee"];
        
        NSString    *package, *time_stamp, *nonce_str, *traceid;
        //获取package包
        package        = [req genPackage:packageParams];
        
        //输出debug info
        NSString *debug     = [req getDebugifo];
        NSLog(@"gen package: %@
",package);
        NSLog(@"生成package: %@
",debug);
        
        //设置支付参数
        time_stamp  = [NSString stringWithFormat:@"%ld", now];
        nonce_str    = [TenpayUtil md5:time_stamp];
        traceid        = @"mytestid_001";
        NSMutableDictionary *prePayParams = [NSMutableDictionary dictionary];
        [prePayParams setObject: APPI_ID                                            forKey:@"appid"];
        [prePayParams setObject: APP_KEY                                            forKey:@"appkey"];
        [prePayParams setObject: nonce_str                                          forKey:@"noncestr"];
        [prePayParams setObject: package                                            forKey:@"package"];
        [prePayParams setObject: time_stamp                                         forKey:@"timestamp"];
        [prePayParams setObject: traceid                                            forKey:@"traceid"];
        
        //生成支付签名
        NSString    *sign;
        sign        = [req createSHA1Sign:prePayParams];
        //增加非参与签名的额外参数
        [prePayParams setObject: @"sha1"                                            forKey:@"sign_method"];
        [prePayParams setObject: sign                                               forKey:@"app_signature"];
        
        //获取prepayId
        NSString *prePayid;
        prePayid            = [req sendPrepay:prePayParams];
        //输出debug info
        debug               = [req getDebugifo];
        NSLog(@"提交预付单： %@
",debug);
        
        if ( prePayid != nil) {
            //重新按提交格式组包，微信客户端5.0.3以前版本只支持package=Sign=***格式，须考虑升级后支持携带package具体参数的情况
            //package       = [NSString stringWithFormat:@"Sign=%@",package];
            package         = @"Sign=WXPay";
            //签名参数列表
            NSMutableDictionary *signParams = [NSMutableDictionary dictionary];
            [signParams setObject: APPI_ID                                          forKey:@"appid"];
            [signParams setObject: APP_KEY                                          forKey:@"appkey"];
            [signParams setObject: nonce_str                                        forKey:@"noncestr"];
            [signParams setObject: package                                          forKey:@"package"];
            [signParams setObject: PARTNER_ID                                       forKey:@"partnerid"];
            [signParams setObject: time_stamp                                       forKey:@"timestamp"];
            [signParams setObject: prePayid                                         forKey:@"prepayid"];
            
            //生成签名
            sign        = [req createSHA1Sign:signParams];
            
            //输出debug info
            debug     = [req getDebugifo];
            NSLog(@"调起支付签名： %@
",debug);
            
            //调起微信支付
            PayReq* req = [[PayReq alloc] init];
            req.openID      = APPI_ID;
            req.partnerId   = PARTNER_ID;
            req.prepayId    = prePayid;
            req.nonceStr    = nonce_str;
            req.timeStamp   = now;
            req.package     = package;
            req.sign        = sign;
            [WXApi safeSendReq:req];
        }else{
            /*long errcode = [req getLasterrCode];
             if ( errcode == 40001 )
             {//Token实效，重新获取
             Token                   = [req GetToken];
             token_time              = now + 600;
             NSLog(@"获取Token： %@
",[req getDebugifo]);
             };*/
            NSLog(@"获取prepayid失败
");
            [self alert:@"提示信息" msg:debug];
        }
    }else{
        NSLog(@"获取Token失败
");
        [self alert:@"提示信息" msg:@"获取Token失败"];
    }
    
}

//客户端提示信息
- (void)alert:(NSString *)title msg:(NSString *)msg
{
    UIAlertView *alter = [[UIAlertView alloc] initWithTitle:title message:msg delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
    
    [alter show];
}

//- (void)onReq:(BaseReq *)req {
//    NSLog(@"qwe123");
//}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end