一.越来越多的app增加第三方的功能，可能app有不同的页面但调用相同的支付方式，例如界面如下：

 

这两个页面都会使用第三方支付支付：（微信，支付宝，银联）如果在每一个页面都直接调用第三方支付的接口全部代码，显然并不是很合适，更何况，可能一个app并不止两个入口。所以封装还是很有必要的。

1.新建Model：-------后台返回支付方式的列表json

#import 
     
      @interface IOAPayItemModel : NSObject//name:代表是支付宝，微信，银联或者余额等@property (nonatomic, copy) NSString *name;//icon:代表是支付方式的图片@property (nonatomic, copy) NSString *icon;//code:代表支付方式的唯一标识@property (nonatomic, copy) NSString *code;//payType:代表支付类型（自己确定的）@property (nonatomic, assign) NSInteger payType;@end
     

#import "IOAPayItemModel.h"@implementation IOAPayItemModel@end

2.封装第三方支付接口以及回调接口-----直接上源代码----会有解释（相信大家的能力，肯定能看懂）

#import 
     
      //支付宝SDK#import 
      
       //微信接口#import 
       
        //银联接口#import "UPPaymentControl.h"/** 枚举：列出第三方支付方式 */typedef NS_ENUM(NSInteger, PayType) {    kPayTypeWXPay, // 微信支付    kPayTypeALiPay, // 支付宝支付    kPayTypeUNPay   // 银联支付};/** IOAPayRequestModel:第三方支付需要的参数 */@interface IOAPayRequestModel: NSObject@property (nonatomic, assign) PayType payType;/** 支付宝和银联-后台返回是字符串类型----支付宝和银联使用此方式 */@property (nonatomic, copy) NSString *payString;@property (nonatomic, copy) NSString *appScheme; // 根据设置的paytype设置/** 微信-后台返回是字典类型--- 微信使用此方式 */@property (nonatomic, strong) NSDictionary *userInfo;@end/** 第三方支付接口返回的数据--- */@interface IOAPayResponseModel: NSObject@property (nonatomic, assign) PayType payType;//result和userInfo信息判断支付结果--（支付成功、支付失败、支付取消等）@property (nonatomic, assign) NSInteger result;@property (nonatomic, strong) NSDictionary *userInfo;@end@interface IOAPayApi : NSObject//支付返回的回调方法@property (nonatomic, copy) void (^callback)(IOAPayResponseModel *response);//支付请求model ----IOAPayRequestModel---第三方支付需要的参数@property (nonatomic, strong) IOAPayRequestModel *payRequestModel;//单例方法+ (instancetype)defaultPayManager;// 是否安装了客户端- (BOOL)isPayAppInstalled:(PayType)payType;// 支付- (void)pay:(IOAPayRequestModel *)payRequestModel callback:(void (^)(IOAPayResponseModel *response))callback;// 支付回调- (void)payCallbackWithUrl:(NSURL *)url;@end
       
      
     

#import "IOAPayApi.h"@implementation IOAPayRequestModel- (void)setPayType:(PayType)payType {    _payType = payType;    if (_payType == kPayTypeALiPay) {        self.appScheme = @"IOAAlipaySDK";        // 测试                return;    }        if (_payType == kPayTypeUNPay) {        self.appScheme = @"UPPay";                // 测试//        self.payString = @"559018436594292239101";                return;    }        // 测试//    self.userInfo = @{//                                 @"appid":@"",//                                 @"noncestr":@"J8pJbaEg6AjDQ9kk",//                                 @"partnerid":@"1497576612",//                                 @"prepayid":@"wx20180321170621b3fbce61a20187009040",//                                 @"result_code":@"SUCCESS",//                                 @"return_code":@"SUCCESS",//                                 @"return_msg":@"OK",//                                 @"sign":@"29FFF7B63A71D3FB4C6866BDBC443F72",//                                 @"timestamp":@"1521623180",//                                 @"trade_type":@"APP",//                                 };}@end@implementation IOAPayResponseModel@end@interface IOAPayApi() 
     
      @end@implementation IOAPayApi//单例方法static IOAPayApi *manager = nil;+ (instancetype)defaultPayManager {    static dispatch_once_t onceToken;    dispatch_once(&onceToken, ^{        manager = [IOAPayApi new];    });    return manager;}+ (instancetype)allocWithZone:(struct _NSZone *)zone {    static dispatch_once_t onceToken;    dispatch_once(&onceToken, ^{        manager = [super allocWithZone:zone];    });        return manager;}//copy在底层 会调用copyWithZone:- (instancetype)copyWithZone:(NSZone *)zone {    return [[self class] defaultPayManager];}+ (instancetype)copyWithZone:(struct _NSZone *)zone {    return [self defaultPayManager];}+ (instancetype)mutableCopyWithZone:(struct _NSZone *)zone {    return [self defaultPayManager];}- (instancetype)mutableCopyWithZone:(NSZone *)zone {    return [[self class] defaultPayManager];}#pragma mark - WeiChatPayDelegate- (void)onResp:(BaseResp *)resp {    //启动微信支付的response    if (self.payRequestModel.payType == kPayTypeWXPay) {        if (self.callback) {            IOAPayResponseModel *payResponseModel = [IOAPayResponseModel new];            payResponseModel.result = 0;            if([resp isKindOfClass:[PayResp class]]){                //支付返回结果，实际支付结果需要去微信服务器端查询                switch (resp.errCode) {                    case 0://                        payResoult = @"支付结果：成功！";                        payResponseModel.result = 1;                        break;                    case -1:                        payResponseModel.result = 0;                        break;                    case -2:                        payResponseModel.result = 0;                        break;                    default:                        break;                }            }                        self.callback(payResponseModel);        }    }}#pragma mark - Public// 是否安装了客户端- (BOOL)isPayAppInstalled:(PayType)payType {    switch (payType) {        case kPayTypeWXPay:            return [WXApi isWXAppInstalled];            break;                    case kPayTypeALiPay:            // 未提供接口 返回NO            return NO;            break;        case kPayTypeUNPay:           return [[UPPaymentControl defaultControl] isPaymentAppInstalled];            break;        default:            break;    }        return NO;}- (void)pay:(IOAPayRequestModel *)payRequestModel callback:(void (^)(IOAPayResponseModel *response))callback {    if (!payRequestModel) return;    self.callback = callback;    self.payRequestModel = payRequestModel;        switch (payRequestModel.payType) {        case kPayTypeWXPay:            [self wxPay:payRequestModel];            break;                    case kPayTypeALiPay:            [self aliPay:payRequestModel];            break;        case kPayTypeUNPay:            [self unPay:payRequestModel];            break;        default:            break;    }}// 支付回调- (void)payCallbackWithUrl:(NSURL *)url {    // 其他如支付等SDK的回调    if ([url.host isEqualToString:@"safepay"]) {        [self aliPayCallback:url];    }    else if ([url.host isEqualToString:@"pay"]) {        // 处理微信的支付结果        [self wxPayCallback:url];    }    else if ([url.host isEqualToString:@"uppayresult"]) {        [self unPayCallback:url];    }}#pragma mark - Pay// 微信支付- (void)wxPay:(IOAPayRequestModel *)payRequestModel {    PayReq *req   = [[PayReq alloc] init];    NSDictionary *dataDic = payRequestModel.userInfo;    //由用户微信号和AppID组成的唯一标识，用于校验微信用户    req.openID = dataDic[@"appid"];    // 商家id，在注册的时候给的    req.partnerId = dataDic[@"partnerid"];    // 预支付订单这个是后台跟微信服务器交互后，微信服务器传给你们服务器的，你们服务器再传给你    req.prepayId  = dataDic[@"prepayid"];    // 根据财付通文档填写的数据和签名    req.package  = @"Sign=WXPay";    // 随机编码，为了防止重复的，在后台生成    req.nonceStr  = dataDic[@"noncestr"];    // 这个是时间戳，也是在后台生成的，为了验证支付的    NSString * stamp = dataDic[@"timestamp"];    req.timeStamp = stamp.intValue;    // 这个签名也是后台做的    req.sign = dataDic[@"sign"];    //发送请求到微信，等待微信返回onResp    [WXApi sendReq:req];}// 支付宝- (void)aliPay:(IOAPayRequestModel *)payRequestModel {    NSString *appScheme = payRequestModel.appScheme;    NSString *payString = payRequestModel.payString;        __weak __typeof(self)weakSelf = self;    [[AlipaySDK defaultService] payOrder:payString fromScheme:appScheme callback:^(NSDictionary *resultDic) {        if (weakSelf.payRequestModel.payType == kPayTypeALiPay) {            if (weakSelf.callback) {                IOAPayResponseModel *payResponseModel = [IOAPayResponseModel new];                payResponseModel.userInfo = resultDic;                payResponseModel.result = [resultDic[@"result"] integerValue];                weakSelf.callback(payResponseModel);            }        }    }];}// 银联支付- (void)unPay:(IOAPayRequestModel *)payRequestModel {    NSString *appScheme = payRequestModel.appScheme;    NSString *payString = payRequestModel.payString;    [[UPPaymentControl defaultControl] startPay:payString fromScheme:appScheme mode:@"01" viewController:[UIApplication sharedApplication].keyWindow.rootViewController];}//- (void)wxPayCallback:(NSURL *)url {    //跳转支付宝钱包进行支付，处理支付结果    [WXApi handleOpenURL:url delegate:self];}- (void)aliPayCallback:(NSURL *)url {    __weak typeof(self)weakSelf = self;    [[AlipaySDK defaultService] processOrderWithPaymentResult:url standbyCallback:^(NSDictionary *resultDic) {        if (weakSelf.payRequestModel.payType == kPayTypeALiPay) {            if (weakSelf.callback) {                IOAPayResponseModel *payResponseModel = [IOAPayResponseModel new];                payResponseModel.userInfo = resultDic;                payResponseModel.result = [resultDic[@"result"] integerValue];                weakSelf.callback(payResponseModel);            }        }    }];}- (void)unPayCallback:(NSURL *)url {    __weak typeof(self)weakSelf = self;    [[UPPaymentControl defaultControl]handlePaymentResult:url completeBlock:^(NSString *code, NSDictionary *data) {        if (weakSelf.payRequestModel.payType == kPayTypeUNPay) {            if (weakSelf.callback) {                IOAPayResponseModel *payResponseModel = [IOAPayResponseModel new];                payResponseModel.userInfo = data;                if ([code isEqualToString:@"success"]) {                    [[NSNotificationCenter defaultCenter] postNotificationName:@"YINLIANPAYS" object:nil];                    payResponseModel.result = [code boolValue];                }                else if([code isEqualToString:@"fail"]) {                    //交易失败                    [[NSNotificationCenter defaultCenter] postNotificationName:@"YINLIANPAYF" object:nil];                    payResponseModel.result = [code boolValue];                }                else if([code isEqualToString:@"cancel"]) {                    //交易取消                    [[NSNotificationCenter defaultCenter] postNotificationName:@"YINLIANPAYC" object:nil];                    payResponseModel.result = 0;                }                                weakSelf.callback(payResponseModel);            }        }    }];}@end
     

3.此时方法就开始封装好了，可以在需要的地方直接使用（弹框已作出）

- (void)alipay{    [self startProgress];    self.requestModel.pay_type = @"alipayMobile";    //自己后台的接口---拿到后台返回的数据作为第三方接口的参数    [self.viewModel requestCartSettlePay:self.requestModel callback:^(IOAResponse *response) {        dispatch_async(dispatch_get_main_queue(), ^{            [self stopProgress];            if (response.success) {                NSString *appScheme = @"IOAAlipaySDK";                self.payRequestModel.payString = response.responseObject;                self.payRequestModel.payType = 1;                self.payRequestModel.appScheme = appScheme;                //第三方接口调用（封装）                [[IOAPayApi defaultPayManager] pay:self.payRequestModel callback:^(IOAPayResponseModel *response) {                    dispatch_async(dispatch_get_main_queue(), ^{                        NSDictionary *userInfo = response.userInfo;                        if (![userInfo[@"resultStatus"] isEqualToString:@"9000"]) {                            //进入待付款界面(支付失败或者支付取消等)                            [self pushWait];                        }else{                            //进入订单列表界面（支付成功）                            [self pushList];                        }                    });                }];            }else{                [self.view makeToast:@"支付失败"];            }        });    }];}

4.重磅来临（一些人弹框没有作出，可以直接拷贝下面代码）

新建控制器控制弹框.h文件中

#import 
     
      #import "IOAPayApi.h"#import "IOAPayItemModel.h"@interface IOAPayViewController : UIViewController//点击第几行回调声明@property (nonatomic, copy) void (^clickCallback)(NSInteger atIndex);+ (instancetype)show;//block回调方法+ (instancetype)show:(void (^)(NSInteger atIndex))clickCallback;+ (void)dismiss;- (void)setupItemTitles:(NSArray 
      
       *)titles;- (void)setupItems:(NSArray 
       
        *)items;- (void)setupTitle:(NSString *)title;@end
       
      
     

实现其方法.m文件中

#import "IOAPayViewController.h"#define PayCellHeight 50#define PaySectionHeaderHeight 44@interface IOAPayViewController () 
     
      @property (nonatomic, strong) CALayer *maskLayer;@property (nonatomic, strong) UILabel *titleView;@property (nonatomic, strong) UIView *payBgView;@property (nonatomic, strong) UITableView *tableView;@property (nonatomic, strong) NSMutableArray *dataSources;@property (nonatomic, assign) CGFloat payViewHeight;- (void)showPayView;- (void)dismissPayView;@end@implementation IOAPayViewController- (void)dealloc {}+ (instancetype)show {    UIViewController *rootvc = [UIApplication sharedApplication].keyWindow.rootViewController;        IOAPayViewController *vc = [IOAPayViewController new];    [rootvc addChildViewController:vc];    [rootvc.view addSubview:vc.view];        [vc setupItemTitles:@[@"微信支付", @"支付宝支付", @"银联支付"]];    [vc showPayView];    return vc;}+ (instancetype)show:(void (^)(NSInteger atIndex))clickCallback {    IOAPayViewController *vc = [self show];    vc.clickCallback = clickCallback;        return vc;}+ (void)dismiss {    UIViewController *rootvc = [UIApplication sharedApplication].keyWindow.rootViewController;    for (UIViewController *vc in rootvc.childViewControllers) {        if ([vc isKindOfClass:[IOAPayViewController class]]) {            IOAPayViewController *tempVC = (IOAPayViewController *)vc;            [tempVC dismissPayView];            return;        }    }}- (void)viewDidLoad {    [super viewDidLoad];    self.view.backgroundColor = [UIColor clearColor];        self.maskLayer.frame = self.view.bounds;    [self.view.layer addSublayer:self.maskLayer];        [self.view addSubview:self.payBgView];//    [self.view addSubview:self.tableView];}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}#pragma mark - UITableViewDataSource- (NSInteger )numberOfSectionsInTableView:(UITableView *)tableView {    return 1;}- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {    return self.dataSources.count;}- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {        UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath];    id temp = self.dataSources[indexPath.row];    if ([temp isKindOfClass:[NSString class]]) {        cell.textLabel.text = temp;    }    else {        IOAPayItemModel *item = temp;        cell.textLabel.text = item.name;    }    cell.textLabel.font = [UIFont systemFontOfSize:18];    cell.textLabel.textColor = RGB_HEXString(@"#323232");    cell.selectionStyle = UITableViewCellSelectionStyleNone;        return cell;}#pragma mark - UITableViewDelegate- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {    return PayCellHeight;}- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section {    return self.titleView;}- (CGFloat )tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section {    return PaySectionHeaderHeight;}- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {//    IOAPayRequestModel *payRequestModel = [IOAPayRequestModel new];//    payRequestModel.payType = indexPath.row;////    WS(weakSelf);////    __weak typeof (self)weakSelf = self;//    __block IOAPayViewController *payVC = self;//    [[IOAPayApi defaultPayManager] pay:payRequestModel callback:^(IOAPayResponseModel *response) {
    ////        __strong __typeof (weakSelf)strongSelf = weakSelf;//        response.payType = indexPath.row;//        if (payVC.clickCallback) {//            payVC.clickCallback(response);//            payVC = nil;//        }//    }];        if (self.clickCallback) {        self.clickCallback(indexPath.row);    }        [self dismissPayView];}#pragma mark - Touches- (void)touchesBegan:(NSSet
      
        *)touches withEvent:(UIEvent *)event {    [self dismissPayView];}#pragma mark - Public- (void)setupItemTitles:(NSArray
       
         *)titles {    if (!titles.count) {        return ;    }        self.payViewHeight = titles.count * PayCellHeight + PaySectionHeaderHeight;    CGRect frame = self.view.frame;    frame.size.height = self.payViewHeight;    self.tableView.frame = frame;        [self.dataSources removeAllObjects];    [self.dataSources addObjectsFromArray:titles];    [self.tableView reloadData];        [self setPayViewFrame];}- (void)setupItems:(NSArray 
        
         *)items {    if (!items.count) {        return ;    }        for (IOAPayItemModel *item in items) {        if ([item.code isEqualToString:@"appWeixinPay"]) {            item.payType = 0;            continue;        }                if ([item.code isEqualToString:@"alipayMobile"]) {            item.payType = 1;            continue;        }                if ([item.code isEqualToString:@"unionpay"]) {            item.payType = 2;            continue;        }        if ([item.code isEqualToString:@"ye"]) {            item.payType = 3;            continue;        }        item.payType = 3;    }        self.payViewHeight = items.count * PayCellHeight + PaySectionHeaderHeight;    CGRect frame = self.view.frame;    frame.size.height = self.payViewHeight;    self.tableView.frame = frame;    [self.dataSources removeAllObjects];    [self.dataSources addObjectsFromArray:items];    [self.tableView reloadData];    [self setPayViewFrame];}- (void)setupTitle:(NSString *)title {    self.titleView.text = title;}#pragma mark - Private- (void)showPayView {    [self.view.layer removeAllAnimations];    CGFloat payBgViewHeight = self.payViewHeight + BottomHeightOffset;    CGRect frame = self.view.frame;    frame.origin.y = self.view.frame.origin.y + self.view.frame.size.height;    frame.size.height = payBgViewHeight;    self.payBgView.frame = frame;        frame.origin.y = self.view.frame.size.height - payBgViewHeight;    [UIView animateWithDuration:0.25 animations:^{        self.payBgView.frame = frame;    }];}- (void)setPayViewFrame {    CGFloat payBgViewHeight = self.payViewHeight + BottomHeightOffset;    CGRect frame = self.view.frame;    frame.origin.y = self.view.frame.origin.y + self.view.frame.size.height;    frame.size.height = payBgViewHeight;    frame.origin.y = self.view.frame.size.height - payBgViewHeight;    self.payBgView.frame = frame;}- (void)dismissPayView {    CGFloat payBgViewHeight = self.payViewHeight + BottomHeightOffset;    CGRect frame = self.view.frame;    frame.origin.y = self.view.frame.origin.y + self.view.frame.size.height;    frame.size.height = payBgViewHeight;        [UIView animateWithDuration:0.25 animations:^{        self.payBgView.frame = frame;    } completion:^(BOOL finished) {        [self.view removeFromSuperview];        [self removeFromParentViewController];    }];}#pragma mark - Setter / Getter- (CALayer *)maskLayer {    if (_maskLayer == nil) {        _maskLayer = [CALayer layer];        _maskLayer.backgroundColor = [UIColor blackColor].CGColor;        _maskLayer.opacity = 0.2;    }        return _maskLayer;}- (UILabel *)titleView {    if (!_titleView) {        _titleView = [UILabel new];        _titleView.textAlignment = NSTextAlignmentCenter;        _titleView.text = @"请选择支付方式";        _titleView.font = [UIFont systemFontOfSize:16];        _titleView.textColor = [UIColor blackColor];        _titleView.backgroundColor = RGB_HEXString(@"#f2f2f2");//[UIColor whiteColor];    }        return _titleView;}- (UIView *)payBgView {    if (!_payBgView) {        _payBgView = [UIView new];        _payBgView.backgroundColor = [UIColor whiteColor];        [_payBgView addSubview:self.tableView];    }    return _payBgView;}- (UITableView *)tableView{    if (!_tableView) {        _tableView = [[UITableView alloc]initWithFrame:CGRectZero style:UITableViewStylePlain];        _tableView.delegate = self;        _tableView.dataSource = self;        _tableView.showsVerticalScrollIndicator = NO;        _tableView.showsHorizontalScrollIndicator = NO;        _tableView.separatorStyle = UITableViewCellSeparatorStyleSingleLine;        _tableView.separatorColor = RGB_HEXString(@"#f2f2f2");        if ([_tableView respondsToSelector:@selector(setSeparatorInset:)]) {            [_tableView setSeparatorInset:UIEdgeInsetsZero];        }        if ([_tableView respondsToSelector:@selector(setLayoutMargins:)]) {            [_tableView setLayoutMargins:UIEdgeInsetsZero];        }                //        [_tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"Cell"];    }    return _tableView;}- (NSMutableArray *)dataSources {    if (!_dataSources) {        _dataSources = [NSMutableArray array];    }    return _dataSources;}- (void)setPayViewHeight:(CGFloat)payViewHeight {    _payViewHeight = payViewHeight;    CGFloat height = self.view.frame.size.height * 0.6;    self.tableView.scrollEnabled = NO;    if (_payViewHeight > height) {        _payViewHeight = height;        self.tableView.scrollEnabled = YES;    }}@end
        
       
      
     

举例方法

利用请求的数据进行赋值传值。

IOAOrderBaseModel *dataSourceModel = self.dataSource[indexPath.section];            IOAOrderSelectAbleItemModel *itemModel = (IOAOrderSelectAbleItemModel *) dataSourceModel.items[row];            IOAPayViewController *vc = [IOAPayViewController show:^(NSInteger atIndex) {                IOAPayItemModel *payItem = itemModel.items[atIndex];                itemModel.selectedIndex = atIndex;                                weakSelf.requestModel.pay_type = payItem.code;                weakSelf.payItem = payItem;                                [weakSelf.tableView reloadSections:[NSIndexSet indexSetWithIndex:section] withRowAnimation:UITableViewRowAnimationNone];            }];            [vc setupItems:self.confirmOrderInfo.payment_list];            [vc setupTitle:@"请选择支付方式"];

最后的举例方法并不是所有的适用，对于上面1.2.3还是可以直接拿过去使用，这些都是原创，如果第一次接入还是希望各位读者读一下上篇文章，集成的整个过程，链接为，这个代码的整个demo，我会尽快上传到github，谢谢！祝贺大家过一个愉快的劳动节！！！