iOS开发微信支付详解（一）

网上看了好多博客文章，与关于微信支付的我拢了拢主要的，可以看看
这是导入的库和配置的URLType

1869333-5a26a95263fc5956.png

一、首先在AppDelegate.m 里

#import "AppDelegate.h"
#import "WXApi.h"
#import "ViewController.h"
@interface AppDelegate ()
@end
@implementation AppDelegate

这里就两行代码注册微信：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
ViewController *viewVC = [[ViewController alloc] init];
UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:viewVC];
self.window.backgroundColor = [UIColor whiteColor];
[self.window setRootViewController:nav];
// 向微信注册
BOOL isOk = [WXApi registerApp:@""];
if (isOk){NSLog(@"注册微信成功");
}else{NSLog(@"注册微信失败");
}return YES;
}

这里的代码就是吊起微信客户端的微信支付功能

- (BOOL)application:(UIApplication *)app openURL:(NSURL *)url options:(NSDictionary*)options
{
// 跳转到URL scheme中配置的地址
NSLog(@"跳转到URL scheme中配置的地址-->%@",url);
return [WXApi handleOpenURL:url delegate:self];  //WXApiDelegate协议
}

微信支付结果回调

- (void)onResp:(BaseResp *)resp
{
NSString *strMsg = [NSString stringWithFormat:@"-errcode:%d", resp.errCode];
NSString *strTitle;
if([resp isKindOfClass:[SendMessageToWXResp class]])
{
strTitle = [NSString stringWithFormat:@"发送媒体消息结果"];
}

if([resp isKindOfClass:[PayResp class]]){
#warning 4.支付返回结果，实际支付结果需要去自己的服务器端查询  由于demo的局限性这里直接使用返回的结果
strTitle = [NSString stringWithFormat:@"支付结果"];
// 返回码参考：https://pay.weixin.qq.com/wiki/doc/api/app.php?chapter=9_12
switch (resp.errCode) {
case WXSuccess:{
strMsg = @"支付结果：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:@"支付结果：失败！retcode = %d, retstr = %@", resp.errCode,resp.errStr];
NSLog(@"错误，retcode = %d, retstr = %@", resp.errCode,resp.errStr);
NSNotification *notification = [NSNotification notificationWithName:@"ORDER_PAY_NOTIFICATION"object:@"fail"];
[[NSNotificationCenter defaultCenter] postNotification:notification];
break;
}

}

}

UIAlertController *alert = [UIAlertController alertControllerWithTitle:strTitle message:strMsg preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *action = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
NSLog(@"知道了");
}];
[alert addAction:action];
[self.window.rootViewController presentViewController:alert animated:YES completion:nil];
NSLog(@"title = %@ message = %@", strTitle, strMsg);
}

---

二、在ViewController.m里面

#import "ViewController.h"
#import "WXApi.h"
@interface ViewController ()
@end
@implementation ViewController
```
/**
*  微信支付需要后台做大量的工作。
*  SDK及官方Demo下载：https://pay.weixin.qq.com/wiki/doc/api/app.php?chapter=11_1
*  官方的开发步骤参考这里：https://pay.weixin.qq.com/wiki/doc/api/app.php?chapter=8_5
*  这篇文档说的也挺详细：http://wenku.baidu.com/link?url=II3oeAaiH9NXWqdoO5HwXWCGcEermreHGBAqKvYfyKz_JVQ2n4NlA56e0H1HJWTNFfUsrTAgjegHBeUpMRzN0S318qcVklep7VCq0wBkpv7
*  还有这篇：http://www.cocoachina.com/bbs/read.php?tid=303132

** 移除通知**
```
- (void)dealloc
{
[[NSNotificationCenter defaultCenter]removeObserver:self];
}
```
** 监听通知**
```
- (void)viewWillAppear:(BOOL)animated{
[super viewWillAppear:animated];
if([WXApi isWXAppInstalled]) // 判断 用户是否安装微信
{
// 监听一个通知
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(getOrderPayResult:) name:@"ORDER_PAY_NOTIFICATION" object:nil];
}

}
```
```
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.navigationItem.title = @"微信支付";
UIButton *payButton = [UIButton buttonWithType:UIButtonTypeCustom];
payButton.frame = CGRectMake(50, 100, self.view.frame.size.width - 100, 60);
payButton.backgroundColor = [UIColor lightGrayColor];
[payButton setTitle:@"微信支付" forState:UIControlStateNormal];
[payButton setImage:[UIImage imageNamed:@"payNow_weixin"] forState:UIControlStateNormal];
[payButton setImageEdgeInsets:UIEdgeInsetsMake(5, -20, 0, 0)];
payButton.layer.cornerRadius = 5;
[payButton addTarget:self action:@selector(weChatPay) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:payButton];
}
```
**#pragma mark - 微信支付**
```
- (void)weChatPay
{
#warning 1.向自己的服务器请求订单生成预支付订单信息
NSString *string = [NSString stringWithFormat:@""];
[ZqNetWork getRequestWithURLString:string Parameters:nil RequestHead:nil DataReturnType:DataReturnTypeData SuccessBlock:^(NSData *data) {
NSDictionary *resultDic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:nil];
// 具体参数根据自己后台来,这里不做示范
// 后台可以参考：https://pay.weixin.qq.com/wiki/doc/api/app.php?chapter=9_12
NSDictionary *dict = [resultDic objectForKey:@""];
if (dict != nil) {
NSMutableString *stamp  = [dict objectForKey:@""];
// 生成预支付订单信息
PayReq *req            = [[PayReq alloc] init];
req.openID              = [dict objectForKey:@""];
req.partnerId          = @"";
req.prepayId            = [dict objectForKey:@""];
req.nonceStr            = [dict objectForKey:@""];
req.timeStamp          = stamp.intValue;
req.package            = [dict objectForKey:@""];
req.sign                = [dict objectForKey:@""];
#warning 2.调起微信支付
if ([WXApi sendReq:req])
{
NSLog(@"调起成功!!!!");
}

else
{
NSLog(@"调起失败!!!");
}

}

} FailureBlock:^(NSError *error) {
NSLog(@"%@", error);
}];
}
```
**#pragma mark - 收到支付成功的消息后作相应的处理**
```
- (void)getOrderPayResult:(NSNotification *)notification
{
if ([notification.object isEqualToString:@"success"])
{
NSLog(@"支付成功！");
}

else
{
NSLog(@"支付失败！");
}

}
```