WXApiManager.h

#import <Foundation/Foundation.h>
#import "WXApi.h"

@protocol WXApiManagerDelegate <NSObject>
@required

@optional
-(void)wxPayResponse:(PayResp *)resp;
-(void)wxSendAuthResponse:(SendAuthResp *)resp;
@end


@interface WXApiManager : NSObject<WXApiDelegate>

@property(nonatomic, weak) id <WXApiManagerDelegate> delegate;
+ (instancetype)sharedManager;

@end

WXApiManager.m

#import "WXApiManager.h"

@implementation WXApiManager

#pragma mark - 单例

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

#pragma mark - WXApiDelegate
- (void)onResp:(BaseResp *)resp
{
    if([resp isKindOfClass:[PayResp class]]){
        PayResp *payResp = (PayResp *)resp;
        [self.delegate wxPayResponse:payResp];
        //支付返回结果，实际支付结果需要去微信服务器端查询
        NSString *strMsg;
        switch (resp.errCode) {
            case WXSuccess:
                strMsg = @"支付结果：成功！";
                NSLog(@"支付成功－PaySuccess，retcode = %d", resp.errCode);
                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);
                break;
        }
    }
    if ([resp isKindOfClass:[SendAuthResp class]]) {
        SendAuthResp *sendAuthResp = (SendAuthResp *)resp;
        [self.delegate wxSendAuthResponse:sendAuthResp];
    }
}
@end

在AppDelegate.m中实现代理<WXApiDelegate>

#pragma mark WECHAT
//重写handleOpenURL和openURL方法
- (BOOL)application:(UIApplication *)app openURL:(NSURL *)url options:(NSDictionary<UIApplicationOpenURLOptionsKey,id> *)options {
    [WXApi handleOpenURL:url delegate:[WXApiManager sharedManager]];
    return YES;
}

在需要接收微信回调的Congroller中实现所需代理<WXApiManagerDelegate>
以登录为例

-(void)wxSendAuthResponse:(SendAuthResp *)resp {
    if (resp.errCode == 0) {
        //获取授权成功
    } else if (resp.errCode == -4) {
        //用户拒绝授权
    } else if (resp.errCode == -2) {
        //用户取消授权
    }
}