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 "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： %@\n",[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: %@\n",package);
NSLog(@"生成package: %@\n",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： %@\n",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： %@\n",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： %@\n",[req getDebugifo]);
};*/
NSLog(@"获取prepayid失败\n");
[self alert:@"提示信息" msg:debug];
}
}else{
NSLog(@"获取Token失败\n");
[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