• 實現微信支付的開發，iOS端里面只需要四個步驟：
• • 向服務端請求預支付，獲得prepayid以及noncestr；
• • 把參數拼起來簽名；
• • 發起支付請求；
• • 處理支付結果。
• iOS的微信SDK的接入：即為“向微信注冊你的應用程序id”、“下載微信終端SDK文件”、“搭建開發環境”、“在代碼中使用開發工具包”。詳情請參看：iOS微信接入指南。
• 導入微信支付庫：開發者需要在工程中鏈接上:SystemConfiguration.framework,libz.dylib,libsqlite3.0.dylib，最重要的庫是libc++.dylib；
• iOS微信支付的具體流程：
• • 向服務端請求預支付，獲得prepayid以及noncestr

//提交預支付 - (NSString *)sendPrepay:(NSMutableDictionary *)prePayParams {NSString *prepayid = nil;//獲取提交支付NSString *send = [self genPackage:prePayParams];//輸出Debug Info[debugInfo appendFormat:@"API鏈接:%@\n", payUrl];[debugInfo appendFormat:@"發送的xml:%@\n", send];//發送請求post xml數據NSData *res = [WXUtil httpSend:payUrl method:@"POST" data:send];//輸出Debug Info[debugInfo appendFormat:@"服務器返回：\n%@\n\n",[[NSString alloc] initWithData:res encoding:NSUTF8StringEncoding]];XMLHelper *xml = [XMLHelper alloc];//開始解析[xml startParse:res];NSMutableDictionary *resParams = [xml getDict];//判斷返回NSString *return_code = [resParams objectForKey:@"return_code"];NSString *result_code = [resParams objectForKey:@"result_code"];if ([return_code isEqualToString:@"SUCCESS"]) {//生成返回數據的簽名NSString *sign = [self createMd5Sign:resParams ];NSString *send_sign =[resParams objectForKey:@"sign"] ;//驗證簽名正確性if( [sign isEqualToString:send_sign]) {if( [result_code isEqualToString:@"SUCCESS"]) {//驗證業務處理狀態prepayid = [resParams objectForKey:@"prepay_id"];return_code = 0;[debugInfo appendFormat:@"獲取預支付交易標示成功！\n"];}}else{last_errcode = 1;[debugInfo appendFormat:@"gen_sign=%@\n _sign=%@\n",sign,send_sign];[debugInfo appendFormat:@"服務器返回簽名驗證錯誤！！！\n"];}}else{last_errcode = 2;[debugInfo appendFormat:@"接口返回錯誤！！！\n"];}return prepayid; }- (NSMutableDictionary *)sendPay_WithPrice:(NSString *)order_price orderNo:(NSString *)orderNo {//訂單標題，展示給用戶NSString *order_name = @"展示給用戶的訂單標題";//預付單參數訂單設置srand( (unsigned)time(0) );NSString *noncestr = [NSString stringWithFormat:@"%d", rand()];NSString *orderno = orderNo;NSMutableDictionary *packageParams = [NSMutableDictionary dictionary];[packageParams setObject: appid forKey:@"appid"]; //開放平臺appid[packageParams setObject: mchid forKey:@"mch_id"]; //商戶號[packageParams setObject: @"APP-001" forKey:@"device_info"]; //支付設備號或門店號[packageParams setObject: noncestr forKey:@"nonce_str"]; //隨機串[packageParams setObject: @"APP" forKey:@"trade_type"]; //支付類型，固定為APP[packageParams setObject: order_name forKey:@"body"]; //訂單描述，展示給用戶[packageParams setObject: NOTIFY_URL forKey:@"notify_url"]; //支付結果異步通知[packageParams setObject: orderno forKey:@"out_trade_no"]; //商戶訂單號[packageParams setObject: @"196.168.1.1" forKey:@"spbill_create_ip"];//發器支付的機器ip[packageParams setObject: order_price forKey:@"total_fee"]; //訂單金額，單位為分//獲取prepayId（預支付交易會話標識）NSString *prePayid;prePayid = [self sendPrepay:packageParams];if ( prePayid != nil) {//獲取到prepayid后進行第二次簽名NSString *package, *time_stamp, *nonce_str;//設置支付參數time_t now;time(&now);time_stamp = [NSString stringWithFormat:@"%ld", now];nonce_str = [WXUtil md5:time_stamp];//重新按提交格式組包，微信客戶端暫只支持package=Sign=WXPay格式，須考慮升級后支持攜帶package具體參數的情況package = @"Sign=WXPay";//第二次簽名參數列表NSMutableDictionary *signParams = [NSMutableDictionary dictionary];[signParams setObject: appid forKey:@"appid"];[signParams setObject: nonce_str forKey:@"noncestr"];[signParams setObject: package forKey:@"package"];[signParams setObject: mchid forKey:@"partnerid"];[signParams setObject: time_stamp forKey:@"timestamp"];[signParams setObject: prePayid forKey:@"prepayid"];//生成簽名NSString *sign = [self createMd5Sign:signParams];//添加簽名[signParams setObject: sign forKey:@"sign"];[debugInfo appendFormat:@"第二步簽名成功，sign＝%@\n",sign];//返回參數列表return signParams;}else{[debugInfo appendFormat:@"獲取prepayid失敗！\n"];}return nil; }

• • 把參數拼起來簽名

//創建package簽名 - (NSString*)createMd5Sign:(NSMutableDictionary*)dict {NSMutableString *contentString =[NSMutableString string];NSArray *keys = [dict allKeys];//按字母順序排序NSArray *sortedArray = [keys sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {return [obj1 compare:obj2 options:NSNumericSearch];}];//拼接字符串for (NSString *categoryId in sortedArray) {if (![[dict objectForKey:categoryId] isEqualToString:@""] && ![categoryId isEqualToString:@"sign"] && ![categoryId isEqualToString:@"key"]){[contentString appendFormat:@"%@=%@&", categoryId, [dict objectForKey:categoryId]];}}//添加key字段[contentString appendFormat:@"key=%@", spkey];//得到MD5 sign簽名NSString *md5Sign =[WXUtil md5:contentString];//輸出Debug Info[debugInfo appendFormat:@"MD5簽名字符串：\n%@\n\n",contentString];return md5Sign; }//獲取package帶參數的簽名包 - (NSString *)genPackage:(NSMutableDictionary*)packageParams {NSString *sign;NSMutableString *reqPars=[NSMutableString string];//生成簽名sign = [self createMd5Sign:packageParams];//生成xml的packageNSArray *keys = [packageParams allKeys];[reqPars appendString:@"<xml>\n"];for (NSString *categoryId in keys) {[reqPars appendFormat:@"<%@>%@</%@>\n", categoryId, [packageParams objectForKey:categoryId],categoryId];}[reqPars appendFormat:@"<sign>%@</sign>\n</xml>", sign];return [NSString stringWithString:reqPars]; }

• • 發起支付請求

- (void)viewWillAppear:(BOOL)animated {[super viewWillAppear:animated];//支付結果通知注冊[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(getOrderPayResult:) name:@"ORDER_PAY_NOTIFICATION" object:nil]; }//調用微信支付 - (void)viewDidLoad {[super viewDidLoad];[self WXPay]; }#pragma mark -- 發起”微信支付“請求 - (void)WXPay {if (![WXApi isWXAppInstalled]) {UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"您還沒有安裝微信" message:nil preferredStyle:UIAlertControllerStyleAlert];UIAlertAction *sureAction = [UIAlertAction actionWithTitle:@"確定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {//跳轉到微信的下載安裝地址}];[alert addAction:sureAction];[self.navigationController presentViewController:alert animated:YES completion:nil];return ;}YDWWeChatPayResquest *req = [YDWWeChatPayResquest new];//初始化支付簽名對象[req init:APP_ID mch_id:MCH_ID];//設置密鑰[req setKey:PARTNER_ID];//獲取到實際調起微信支付的參數后，在app端調起支付NSInteger payTheAmount;//支付金額NSString *orderMeony = [NSString stringWithFormat:@"%ld",payTheAmount];NSDictionary *orderDic;//支付訂單NSString *orderNo = [orderDic objectForKey:@"orderNumber"];NSMutableDictionary *dict = [req sendPay_WithPrice:orderMeony orderNo: orderNo];if(dict == nil){//錯誤提示NSString *debug = [req getDebugifo];UIAlertController *alert = [UIAlertController alertControllerWithTitle:debug message:nil preferredStyle:UIAlertControllerStyleAlert];UIAlertAction *sureAction = [UIAlertAction actionWithTitle:@"確定" style:UIAlertActionStyleDefault handler:nil];[alert addAction:sureAction];[self.navigationController presentViewController:alert animated:YES completion:nil];}else{NSMutableString *stamp = [dict objectForKey:@"timestamp"];//調起微信支付PayReq* req = [[PayReq alloc] init];req.openID = [dict objectForKey:@"appid"];req.partnerId = [dict objectForKey:@"partnerid"];req.prepayId = [dict objectForKey:@"prepayid"];req.nonceStr = [dict objectForKey:@"noncestr"];req.timeStamp = stamp.intValue;req.package = [dict objectForKey:@"package"];req.sign = [dict objectForKey:@"sign"];[WXApi sendReq:req];} }- (void)weixinPay {YDWWeixinPayParams *signParams = [[YDWWeixinPayParams alloc] initWithPrepayid:self.prepay_id noncestr:self.nonce_str];//調起微信支付PayReq *req = [[PayReq alloc] init];req.openID = signParams.appid;req.partnerId = signParams.partnerid;req.prepayId = signParams.prepayid;req.nonceStr = signParams.noncestr;req.timeStamp = signParams.timestamp.intValue;req.package = signParams.package;req.sign = [signParams sign];[WXApi sendReq:req]; }#pragma mark - 支付結果通知信息 - (void)getOrderPayResult:(NSNotification *)notification{if ([notification.object isEqualToString:@"success"]) {UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"恭喜" message:@"您已成功支付啦!" preferredStyle:UIAlertControllerStyleAlert];UIAlertAction *sureAction = [UIAlertAction actionWithTitle:@"確定" style:UIAlertActionStyleDefault handler:nil];[alert addAction:sureAction];[self.navigationController presentViewController:alert animated:YES completion:nil];}else{UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"提示" message:@"支付失敗,可在待付款訂單中查看" preferredStyle:UIAlertControllerStyleAlert];UIAlertAction *sureAction = [UIAlertAction actionWithTitle:@"確定" style:UIAlertActionStyleDefault handler:nil];[alert addAction:sureAction];[self.navigationController presentViewController:alert animated:YES completion:nil];} }//移除通知 - (void)viewWillDisappear:(BOOL)animated{[[NSNotificationCenter defaultCenter]removeObserver:self]; }

• • 處理支付結果，在AppDelegate中做的工作：
• • • 1、導入#import “WXApi.h”和#import “WXApiObject.h”，并遵守WXApiDelegate協議，要使你的程序啟動后微信終端能響應你的程序，必須在代碼中向微信終端注冊你的id：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {[WXApi registerApp:@"WXAppId" withDescription:@"YDWWXPayDes"];return YES; }

• • • 2、重寫AppDelegate的handleOpenURL和openURL方法：

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

• • • 3、處理結果：

- (void)onResp:(BaseResp *)resp {NSString *strMsg = [NSString stringWithFormat:@"errcode:%d", resp.errCode];NSString *strTitle;if([resp isKindOfClass:[SendMessageToWXResp class]]) {strTitle = [NSString stringWithFormat:@"發送媒體消息結果"];}if([resp isKindOfClass:[PayResp class]]){//支付返回結果，實際支付結果需要去微信服務器端查詢strTitle = [NSString stringWithFormat:@"支付結果"];switch (resp.errCode) {case WXSuccess:{strMsg = @"支付結果：成功！";NSLog(@"支付成功－PaySuccess，retcode = %d", resp.errCode);NSNotification *notification = [NSNotification notificationWithName:@"ORDER_PAY_NOTIFICATION" object:@"success"];[[NSNotificationCenter defaultCenter] postNotification:notification];break;}default:{strMsg = [NSString stringWithFormat:@"支付結果：失敗！retcode = %d, retstr = %@", resp.errCode,resp.errStr];NSLog(@"錯誤，retcode = %d, retstr = %@", resp.errCode,resp.errStr);NSNotification *notification = [NSNotification notificationWithName:@"ORDER_PAY_NOTIFICATION" object:@"fail"];[[NSNotificationCenter defaultCenter] postNotification:notification];break;}}}// UIAlertView *alert = [[UIAlertView alloc] initWithTitle:strTitle message:strMsg delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil]; // [alert show];}

• 常見的問題：
• • 如果跳轉到微信里之只彈出了一個確定按鈕，那么這時候需要檢查幾個方面：
• • • 1、appid，mch_id,partner_id是否設置正確。mch_id對應的key其實是partnerid，partner_id對應的key其實是key；
• • • 2、timestamp 應為10位；
• • • 3、簽名需要排序，并用md5加密。
• 最后附上重要的類的全部代碼：
• • AppDelegate：

// AppDelegate.h // 微信支付 // // Created by YDW on 16/3/28. // Copyright ? 2016年 IZHUO.NET. All rights reserved. //#import <UIKit/UIKit.h> #import "WXApi.h" #import "WXApiObject.h"@interface AppDelegate : UIResponder <UIApplicationDelegate,WXApiDelegate>@property (strong, nonatomic) UIWindow *window;@end// AppDelegate.m // 微信支付 // // Created by YDW on 16/3/28. // Copyright ? 2016年 IZHUO.NET. All rights reserved. //#import "AppDelegate.h"@interface AppDelegate ()@end@implementation AppDelegate- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {[WXApi registerApp:@"WXAppId" withDescription:@"YDWWXPayDes"];return YES; }- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation {return [WXApi handleOpenURL:url delegate:self]; }- (BOOL)application:(UIApplication *)application handleOpenURL:(NSURL *)url {return [WXApi handleOpenURL:url delegate:self]; }- (void)onResp:(BaseResp *)resp {NSString *strMsg = [NSString stringWithFormat:@"errcode:%d", resp.errCode];NSString *strTitle;if([resp isKindOfClass:[SendMessageToWXResp class]]) {strTitle = [NSString stringWithFormat:@"發送媒體消息結果"];}if([resp isKindOfClass:[PayResp class]]){//支付返回結果，實際支付結果需要去微信服務器端查詢strTitle = [NSString stringWithFormat:@"支付結果"];switch (resp.errCode) {case WXSuccess:{strMsg = @"支付結果：成功！";NSLog(@"支付成功－PaySuccess，retcode = %d", resp.errCode);NSNotification *notification = [NSNotification notificationWithName:@"ORDER_PAY_NOTIFICATION" object:@"success"];[[NSNotificationCenter defaultCenter] postNotification:notification];break;}default:{strMsg = [NSString stringWithFormat:@"支付結果：失敗！retcode = %d, retstr = %@", resp.errCode,resp.errStr];NSLog(@"錯誤，retcode = %d, retstr = %@", resp.errCode,resp.errStr);NSNotification *notification = [NSNotification notificationWithName:@"ORDER_PAY_NOTIFICATION" object:@"fail"];[[NSNotificationCenter defaultCenter] postNotification:notification];break;}}}// UIAlertView *alert = [[UIAlertView alloc] initWithTitle:strTitle message:strMsg delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil]; // [alert show];}

YDWWeChatPayResquest：

// YDWWeChatPayResquest.h // 微信支付 // // Created by YDW on 16/3/28. // Copyright ? 2016年 IZHUO.NET. All rights reserved. //#import <Foundation/Foundation.h> #import "WXUtil.h" #import "ApiXml.h"/** 賬號的賬戶資料：更改商戶后的相關參數后可以使用*/#define APP_ID @"你的APP的ID" //APPID #define APP_SECRET @"你的APP的secret" //appsecret #define MCH_ID @"商戶號" //商戶號，填寫商戶對應參數 #define PARTNER_ID @"商戶API密鑰" //商戶API密鑰，填寫相應參數 #define NOTIFY_URL @"回調頁面地址" //支付結果回調頁面 #define SP_URL @"服務器端支付數據地址"//獲取服務器端支付數據地址（商戶自定義）@interface YDWWeChatPayResquest : NSObject {//預支付的url地址NSString *payUrl;//lash_errcode;long last_errcode;//debug信息NSMutableString *debugInfo;NSString *appid,*mchid,*spkey;}- (BOOL)init:(NSString *)app_id mch_id:(NSString *)mch_id; - (NSString *)getDebugifo; - (long)getLasterrCode; //設置商戶密鑰 - (void)setKey:(NSString *)key; //創建package簽名 - (NSString*)createMd5Sign:(NSMutableDictionary*)dict; //獲取package帶參數的簽名包 - (NSString *)genPackage:(NSMutableDictionary*)packageParams; //提交預支付 - (NSString *)sendPrepay:(NSMutableDictionary *)prePayParams;- (NSMutableDictionary *)sendPay_WithPrice:(NSString *)order_price orderNo:(NSString *)orderNo; //簽名實例測試 //- (NSMutableDictionary *)sendPay_demo; @end// YDWWeChatPayResquest.m // 微信支付 // // Created by YDW on 16/3/28. // Copyright ? 2016年 IZHUO.NET. All rights reserved. //#import <Foundation/Foundation.h> #import "YDWWeChatPayResquest.h"@implementation YDWWeChatPayResquest- (BOOL)init:(NSString *)app_id mch_id:(NSString *)mch_id {payUrl = @"https://api.mch.weixin.qq.com/pay/unifiedorder";if (debugInfo == nil){debugInfo = [NSMutableString string];}[debugInfo setString:@""];appid = app_id;mchid = mch_id;return YES; }//設置商戶密鑰 - (void)setKey:(NSString *)key {spkey = [NSString stringWithString:key]; }//獲取debug信息 - (NSString*)getDebugifo {NSString *res = [NSString stringWithString:debugInfo];[debugInfo setString:@""];return res; }//獲取最后服務返回錯誤代碼 - (long)getLasterrCode {return last_errcode; }//創建package簽名 - (NSString*)createMd5Sign:(NSMutableDictionary*)dict {NSMutableString *contentString =[NSMutableString string];NSArray *keys = [dict allKeys];//按字母順序排序NSArray *sortedArray = [keys sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {return [obj1 compare:obj2 options:NSNumericSearch];}];//拼接字符串for (NSString *categoryId in sortedArray) {if (![[dict objectForKey:categoryId] isEqualToString:@""] && ![categoryId isEqualToString:@"sign"] && ![categoryId isEqualToString:@"key"]){[contentString appendFormat:@"%@=%@&", categoryId, [dict objectForKey:categoryId]];}}//添加key字段[contentString appendFormat:@"key=%@", spkey];//得到MD5 sign簽名NSString *md5Sign =[WXUtil md5:contentString];//輸出Debug Info[debugInfo appendFormat:@"MD5簽名字符串：\n%@\n\n",contentString];return md5Sign; }//獲取package帶參數的簽名包 - (NSString *)genPackage:(NSMutableDictionary*)packageParams {NSString *sign;NSMutableString *reqPars=[NSMutableString string];//生成簽名sign = [self createMd5Sign:packageParams];//生成xml的packageNSArray *keys = [packageParams allKeys];[reqPars appendString:@"<xml>\n"];for (NSString *categoryId in keys) {[reqPars appendFormat:@"<%@>%@</%@>\n", categoryId, [packageParams objectForKey:categoryId],categoryId];}[reqPars appendFormat:@"<sign>%@</sign>\n</xml>", sign];return [NSString stringWithString:reqPars]; }//提交預支付 - (NSString *)sendPrepay:(NSMutableDictionary *)prePayParams {NSString *prepayid = nil;//獲取提交支付NSString *send = [self genPackage:prePayParams];//輸出Debug Info[debugInfo appendFormat:@"API鏈接:%@\n", payUrl];[debugInfo appendFormat:@"發送的xml:%@\n", send];//發送請求post xml數據NSData *res = [WXUtil httpSend:payUrl method:@"POST" data:send];//輸出Debug Info[debugInfo appendFormat:@"服務器返回：\n%@\n\n",[[NSString alloc] initWithData:res encoding:NSUTF8StringEncoding]];XMLHelper *xml = [XMLHelper alloc];//開始解析[xml startParse:res];NSMutableDictionary *resParams = [xml getDict];//判斷返回NSString *return_code = [resParams objectForKey:@"return_code"];NSString *result_code = [resParams objectForKey:@"result_code"];if ([return_code isEqualToString:@"SUCCESS"]) {//生成返回數據的簽名NSString *sign = [self createMd5Sign:resParams ];NSString *send_sign =[resParams objectForKey:@"sign"] ;//驗證簽名正確性if( [sign isEqualToString:send_sign]) {if( [result_code isEqualToString:@"SUCCESS"]) {//驗證業務處理狀態prepayid = [resParams objectForKey:@"prepay_id"];return_code = 0;[debugInfo appendFormat:@"獲取預支付交易標示成功！\n"];}}else{last_errcode = 1;[debugInfo appendFormat:@"gen_sign=%@\n _sign=%@\n",sign,send_sign];[debugInfo appendFormat:@"服務器返回簽名驗證錯誤！！！\n"];}}else{last_errcode = 2;[debugInfo appendFormat:@"接口返回錯誤！！！\n"];}return prepayid; }- (NSMutableDictionary *)sendPay_WithPrice:(NSString *)order_price orderNo:(NSString *)orderNo {//訂單標題，展示給用戶NSString *order_name = @"展示給用戶的訂單標題";//預付單參數訂單設置srand( (unsigned)time(0) );NSString *noncestr = [NSString stringWithFormat:@"%d", rand()];NSString *orderno = orderNo;NSMutableDictionary *packageParams = [NSMutableDictionary dictionary];[packageParams setObject: appid forKey:@"appid"]; //開放平臺appid[packageParams setObject: mchid forKey:@"mch_id"]; //商戶號[packageParams setObject: @"APP-001" forKey:@"device_info"]; //支付設備號或門店號[packageParams setObject: noncestr forKey:@"nonce_str"]; //隨機串[packageParams setObject: @"APP" forKey:@"trade_type"]; //支付類型，固定為APP[packageParams setObject: order_name forKey:@"body"]; //訂單描述，展示給用戶[packageParams setObject: NOTIFY_URL forKey:@"notify_url"]; //支付結果異步通知[packageParams setObject: orderno forKey:@"out_trade_no"]; //商戶訂單號[packageParams setObject: @"196.168.1.1" forKey:@"spbill_create_ip"];//發器支付的機器ip[packageParams setObject: order_price forKey:@"total_fee"]; //訂單金額，單位為分//獲取prepayId（預支付交易會話標識）NSString *prePayid;prePayid = [self sendPrepay:packageParams];if ( prePayid != nil) {//獲取到prepayid后進行第二次簽名NSString *package, *time_stamp, *nonce_str;//設置支付參數time_t now;time(&now);time_stamp = [NSString stringWithFormat:@"%ld", now];nonce_str = [WXUtil md5:time_stamp];//重新按提交格式組包，微信客戶端暫只支持package=Sign=WXPay格式，須考慮升級后支持攜帶package具體參數的情況package = @"Sign=WXPay";//第二次簽名參數列表NSMutableDictionary *signParams = [NSMutableDictionary dictionary];[signParams setObject: appid forKey:@"appid"];[signParams setObject: nonce_str forKey:@"noncestr"];[signParams setObject: package forKey:@"package"];[signParams setObject: mchid forKey:@"partnerid"];[signParams setObject: time_stamp forKey:@"timestamp"];[signParams setObject: prePayid forKey:@"prepayid"];//生成簽名NSString *sign = [self createMd5Sign:signParams];//添加簽名[signParams setObject: sign forKey:@"sign"];[debugInfo appendFormat:@"第二步簽名成功，sign＝%@\n",sign];//返回參數列表return signParams;}else{[debugInfo appendFormat:@"獲取prepayid失敗！\n"];}return nil; }@end

• • 調用微信支付的頁面：

@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad {[super viewDidLoad];[self WXPay]; }- (void)viewWillAppear:(BOOL)animated {[super viewWillAppear:animated];//支付結果通知注冊[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(getOrderPayResult:) name:@"ORDER_PAY_NOTIFICATION" object:nil]; }#pragma mark -- 發起”微信支付“請求 - (void)WXPay {if (![WXApi isWXAppInstalled]) {UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"您還沒有安裝微信" message:nil preferredStyle:UIAlertControllerStyleAlert];UIAlertAction *sureAction = [UIAlertAction actionWithTitle:@"確定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {//跳轉到微信的下載安裝地址}];[alert addAction:sureAction];[self.navigationController presentViewController:alert animated:YES completion:nil];return ;}YDWWeChatPayResquest *req = [YDWWeChatPayResquest new];//初始化支付簽名對象[req init:APP_ID mch_id:MCH_ID];//設置密鑰[req setKey:PARTNER_ID];//獲取到實際調起微信支付的參數后，在app端調起支付NSInteger payTheAmount;//支付金額NSString *orderMeony = [NSString stringWithFormat:@"%ld",payTheAmount];NSDictionary *orderDic;//支付訂單NSString *orderNo = [orderDic objectForKey:@"orderNumber"];NSMutableDictionary *dict = [req sendPay_WithPrice:orderMeony orderNo: orderNo];if(dict == nil){//錯誤提示NSString *debug = [req getDebugifo];UIAlertController *alert = [UIAlertController alertControllerWithTitle:debug message:nil preferredStyle:UIAlertControllerStyleAlert];UIAlertAction *sureAction = [UIAlertAction actionWithTitle:@"確定" style:UIAlertActionStyleDefault handler:nil];[alert addAction:sureAction];[self.navigationController presentViewController:alert animated:YES completion:nil];}else{NSMutableString *stamp = [dict objectForKey:@"timestamp"];//調起微信支付PayReq* req = [[PayReq alloc] init];req.openID = [dict objectForKey:@"appid"];req.partnerId = [dict objectForKey:@"partnerid"];req.prepayId = [dict objectForKey:@"prepayid"];req.nonceStr = [dict objectForKey:@"noncestr"];req.timeStamp = stamp.intValue;req.package = [dict objectForKey:@"package"];req.sign = [dict objectForKey:@"sign"];[WXApi sendReq:req];} }#pragma mark - 支付結果通知信息 - (void)getOrderPayResult:(NSNotification *)notification{if ([notification.object isEqualToString:@"success"]) {UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"恭喜" message:@"您已成功支付啦!" preferredStyle:UIAlertControllerStyleAlert];UIAlertAction *sureAction = [UIAlertAction actionWithTitle:@"確定" style:UIAlertActionStyleDefault handler:nil];[alert addAction:sureAction];[self.navigationController presentViewController:alert animated:YES completion:nil];}else{UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"提示" message:@"支付失敗,可在待付款訂單中查看" preferredStyle:UIAlertControllerStyleAlert];UIAlertAction *sureAction = [UIAlertAction actionWithTitle:@"確定" style:UIAlertActionStyleDefault handler:nil];[alert addAction:sureAction];[self.navigationController presentViewController:alert animated:YES completion:nil];} }//移除通知 - (void)viewWillDisappear:(BOOL)animated{[[NSNotificationCenter defaultCenter]removeObserver:self]; }@end

總結

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