Mopub Mediation Native

官方教學：連結
NativeAd需要建立4個客製化class來串接廣告，若是開發者原本已經有串接MoPub native廣告的話則只需要，TAMediaCustomNativeAdEventAdapter及TAMediaCustomNativeAdEvent即可。

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TAMediaCustomNativeAdEventAdapter(必要)

此 class 是作為 TADNativeAd 與 MPNativeAd 的橋樑，將 TADNativeAd 轉換為 MPNativeAd 所需要的 Dictionary
1.建立一class實做MPNativeAdAdapter protocol，protocol 有兩必須實作 property:properties 及 defaultActionURL
2.建立初始化方法，將TAMedia native ad作為參數帶入，將由TAMeida native ad拿到的dictionary與MPNativeAdConstants.h提供的key值建立相對應的dictionary後賦予給prooerties
3.defaultActionURL則為TAMedia拿到的nurl
4.實作displayContentForURL:rootViewController:completion:當user點擊時觸發
參考以下代碼

  //  TAMediaCustomNativeAdEventAdapter.h
  #import <Foundation/Foundation.h>
  #import "MPNativeAdAdapter.h"
  #import <TAMediaAdsFramework/TAMediaAdsFramework.h>
  
  @interface TAMediaCustomNativeAdEventAdapter : NSObject <MPNativeAdAdapter>
  
  - (instancetype)initWithTADNativeAd:(TADNativeAd *)nativeAd;
  
  @property (nonatomic, readonly) NSDictionary *properties;
  @property (nonatomic, readonly) NSURL *defaultActionURL;
  @property (nonatomic, weak) id<MPNativeAdAdapterDelegate> delegate;
  @end

  //  TAMediaCustomNativeAdEventAdapter.m
  #import "TAMediaCustomNativeAdEventAdapter.h"
  #import "MPNativeAdConstants.h"
  
  @interface TAMediaCustomNativeAdEventAdapter () <TADNativeAdDelegate>
  @property (nonatomic,strong) TADNativeAd *nativeAd;
  @end
  
  @implementation TAMediaCustomNativeAdEventAdapter 
   
  - (instancetype)initWithTADNativeAd:(TADNativeAd *)nativeAd {
   self = [super init];
   NSDictionary *tadDic = [nativeAd getNativeAdContent];
   nativeAd.delegate = self;
   self.nativeAd = nativeAd;
   self = [self initWithTADic:tadDic];
   return self;
   }
  - (instancetype)initWithTADic:(NSDictionary *)taDic {
      self = [super init];
      NSDictionary *taMeidaDicMapping = @{@"LONGSUBJECT":kAdTitleKey,
                                       @"BODY":kAdTextKey,
                                       @"ICONSQUARE":kAdIconImageKey,
                                       @"IMAGE1200X627":kAdMainImageKey,
                                       @"VIDEO":kVASTVideoKey,
                                       @"nurl":kDefaultActionURLKey,
                                       @"CTA":kAdCTATextKey
                                       };
   
   NSMutableDictionary *dic = [NSMutableDictionary new];
   for (NSString *key in taDic.allKeys) {
       NSString *newKey = taMeidaDicMapping[key];
       if (newKey == nil) {
           newKey = key;
       }
       [dic setObject:taDic[key] forKey:newKey];
   }
      _properties = dic;
      _defaultActionURL = [NSURL URLWithString:taDic[@"nurl"]];
      return self;
  }
  
   - (void)displayContentForURL:(NSURL *)URL rootViewController:(UIViewController *)controller {    
   [self.nativeAd handleClick];
   if ([self.delegate respondsToSelector:@selector(nativeAdDidClick:)]) {
       [self.delegate nativeAdDidClick:self];
   }    
   }
   - (void)adViewWillLeaveApplication:(TADNativeAd *)adView {
       if ([self.delegate respondsToSelector:@selector(nativeAdWillLeaveApplicationFromAdapter:)]) {
           [self.delegate nativeAdWillLeaveApplicationFromAdapter:self];
       }    
   }
  @end

TAMediaCustomNativeAdEventSetting

此class需實做MPNativeAdRendererSettings protocol，用來設定 viewSize，與指定需要來呈現廣告的 View，亦可使用 MPNativeAdRendererSettings 取代

  //  TAMediaCustomNativeAdEventSetting.h
  #import <Foundation/Foundation.h>
  #import "MPNativeAdRendererSettings.h"
  @interface TAMediaCustomNativeAdEventSetting : NSObject <MPNativeAdRendererSettings>
  
  @property (nonatomic, assign) Class renderingViewClass;
  
  @property (nonatomic, readwrite, copy) MPNativeViewSizeHandler viewSizeHandler;
  @end

  //  TAMediaCustomNativeAdEventSetting.m
  #import "TAMediaCustomNativeAdEventSetting.h"
  @implementation TAMediaCustomNativeAdEventSetting
  @end

TAMediaCustomNativeAdRenderer

此 class 需實做 MPNativeAdRenderer protocol，用於設置客製化事件處理的 class (TAMediaCustomNativeAdEvent) 以及將由 adapter 取得的 Dictionary 呈現到所需的 adView 內並回傳
1.實作+ (MPNativeAdRendererConfiguration *)rendererConfigurationWithRendererSettings:(id<MPNativeAdRendererSettings>)rendererSettings建立 MPNativeAdRendererConfiguration物件
2.設置 rendering class 為本身class
3.設置 rendererSettings 為參數傳入 的rendererSettings
4.設置 supportedCustomEvents 為 TAMediaCustomNativeAdEvent class
5.實作initWithRendererSettings:設置物件viewSizeHandler，以及任何客製化設定
6.實作retrieveViewWithAdapter:回傳要來呈顯在畫面上的 View
參考以下代碼

  //  TAMediaCustomNativeAdRenderer.h
  #import <Foundation/Foundation.h>
  #import <MoPub/MoPub.h>
  @interface TAMediaCustomNativeAdRenderer : NSObject <MPNativeAdRenderer>
  
  @property (nonatomic, readonly) MPNativeViewSizeHandler viewSizeHandler;
  
  @end

  //  TAMediaCustomNativeAdRenderer.m
  #import "TAMediaCustomNativeAdRenderer.h"
  #import "MPNativeAdView.h"
  
  @interface TAMediaCustomNativeAdRenderer() <MPNativeAdRendererImageHandlerDelegate>
  
  @property (nonatomic,strong) id<MPNativeAdRendererSettings>setting;
  
  @property (nonatomic,strong) MPNativeAdRendererImageHandler *rendererImageHandler;
  
  @end
   
  @implementation TAMediaCustomNativeAdRenderer
  
  + (MPNativeAdRendererConfiguration *)rendererConfigurationWithRendererSettings:(id<MPNativeAdRendererSettings>)rendererSettings {
      MPNativeAdRendererConfiguration *config = [[MPNativeAdRendererConfiguration alloc] init];
      config.rendererSettings = rendererSettings;
      config.supportedCustomEvents = @[@"TAMediaCustomNativeAdEvent"];//設置客製化事件處理的class
      config.rendererClass = [self class];
      return config;
  }
  
  - (instancetype)initWithRendererSettings:(id<MPNativeAdRendererSettings>)rendererSettings {
      self = [super init];
      _viewSizeHandler = [rendererSettings.viewSizeHandler copy];
      self.setting = rendererSettings;
      self.rendererImageHandler = [MPNativeAdRendererImageHandler new];
      self.rendererImageHandler.delegate = self;
      return self;
  }
  
  - (UIView *)retrieveViewWithAdapter:(id<MPNativeAdAdapter>)adapter error:(NSError **)error {
      UIView<MPNativeAdRendering> *adView = [MPNativeAdView new];
      //MPNativeAdRendering potocol設置的項目
      //需依照串接不同的Native廣告，設定不同的值
      adView.nativeTitleTextLabel.text = adapter.properties[kAdTitleKey];
      adView.nativeMainTextLabel.text = adapter.properties[kAdTextKey];
      adView.nativeCallToActionTextLabel.text = adapter.properties[kAdCTATextKey];
      [self.rendererImageHandler loadImageForURL:[NSURL URLWithString:[adapter.properties objectForKey:kAdIconImageKey]] intoImageView:adView.nativeIconImageView];
      [self.rendererImageHandler loadImageForURL:[NSURL URLWithString:[adapter.properties objectForKey:kAdMainImageKey]] intoImageView:adView.nativeMainImageView];
      
      //MPNativeAdRendering potocol以外的項目用以下方式設置
      MPNativeAdRenderingImageLoader *imageLoader = [[MPNativeAdRenderingImageLoader alloc] initWithImageHandler:self.rendererImageHandler];
      [adView layoutCustomAssetsWithProperties:adapter.properties imageLoader:imageLoader];
      return adView;
  }
  
  - (BOOL)nativeAdViewInViewHierarchy
  {
      return YES;
  }
  @end

TAMediaCustomNativeAdEvent(必要)

此 class 需繼承 MPNativeCustomEvent，用來取得 TAmedia native ad 提供給 MoPub
1.建立 class 繼承 MPNativeCustomEvent
2.複寫 - (void)requestAdWithCustomEventInfo:(NSDictionary *)info在此用 TADNativeAd 去取得廣告
3.取得廣告後用取得的 Dictionary 建立 TAMediaCustomNativeAdEventAdapter 後再用 adapter 建立MPNativeAd
4.呈現廣告前先呼叫父類別precacheImagesWithURLs:completionBlock:取得image後，再呼叫customNativeEvent:didLoadAd:


 #import <MoPub/MoPub.h>
 #import <TAMediaAdsFramework/TAMediaAdsFramework.h>
 
 @interface TAMediaCustomNativeAdEvent : MPNativeCustomEvent <TADNativeAdDelegate> {
     TADNativeAd *nativeAd;
 }
 
 @end

 #import "TAMediaCustomNativeAdEvent.h"
 #import "TAMediaCustomNativeAdEventAdapter.h"
 #import <MoPub/MoPub.h>
 
 @implementation TAMediaCustomNativeAdEvent
 
 - (void)requestAdWithCustomEventInfo:(NSDictionary *)info adMarkup:(NSString *)adMarkup {
     TADRequest *request = [TADRequest request];
     request.testing = NO;
   // Type: TADGender
     request.gender = kTADGenderUnknown;
     
     // NAD 物件初始化, 帶入自訂的origin
     if (!nativeAd) {
         nativeAd = [[TADNativeAd alloc] initWithAdUnitId:info[@"NativeId"]];        
     }
     // 必須要設定delegate
     nativeAd.delegate = self;
     // 載入廣告
     [nativeAd loadRequest:request];
 
 }
 
 - (void)nativeAdDidReceiveAd:(TADNativeAd *)ad {
     // 表示本次請求收到廣告
     TAMediaCustomNativeAdEventAdapter *adapter = [[TAMediaCustomNativeAdEventAdapter alloc] initWithTADNativeAd:ad];
     MPNativeAd *mpNativeAd = [[MPNativeAd alloc] initWithAdAdapter:adapter];
     //藉由 getNativeAdContent 取得包含回覆內容的 NSDictionary
     NSDictionary *nadDic = [nativeAd getNativeAdContent];
     NSMutableArray *imageURLs = [NSMutableArray array];
     for (NSString *key in nadDic.allKeys) {
         if ([[key lowercaseString] hasPrefix:@"image"] || [key hasPrefix:@"ICON"]) {
             if (nadDic[key] && ![nadDic[key] isEqualToString:@""]) {
                 NSURL *url = [NSURL URLWithString:nadDic[key]];
                 [imageURLs addObject:url];
             }            
         }
     }
     //在呼叫delegate didloadAd前先將圖片預載
     [super precacheImagesWithURLs:imageURLs completionBlock:^(NSArray *errors) {
         if (errors) {            
             [self.delegate nativeCustomEvent:self didFailToLoadAdWithError:MPNativeAdNSErrorForImageDownloadFailure()];
         } else {
             [self.delegate nativeCustomEvent:self didLoadAd:mpNativeAd];
         }
     }];
 }
 
 - (void)nativeAd:(TADNativeAd *)ad didFailToReceiveAdWithError:(TADRequestError *)error {
     if ([self.delegate respondsToSelector:@selector(nativeCustomEvent:didFailToLoadAdWithError:)]) {
         [self.delegate nativeCustomEvent:self didFailToLoadAdWithError:error];
     }
 }
 
 - (void)dealloc {
     if (nativeAd != nil) {
         nativeAd.delegate = nil;
         nativeAd = nil;
     }
 }
 
 @end