檢視 Mopub Mediation Native 的原始碼

官方教學：[https://github.com/mopub/mopub-ios-sdk/wiki/Custom-Events 連結]<br>
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。

[[MoPub Mediation Setting|回MoPub教學]]

== 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 <br>
1.建立一class實做MPNativeAdAdapter protocol，protocol 有兩必須實作 property:properties 及 defaultActionURL<br>
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<br>
3.defaultActionURL則為TAMedia拿到的nurl<br>
4.實作<code>displayContentForURL:rootViewController:completion:</code>當user點擊時觸發<br>
參考以下代碼<br>
   //  TAMediaCustomNativeAdEventAdapter.h
   #import <Foundation/Foundation.h>
   #import <MoPub/MoPub.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"
   
   @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<br>
   //  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<br>
1.實作<code>+ (MPNativeAdRendererConfiguration *)rendererConfigurationWithRendererSettings:(id<MPNativeAdRendererSettings>)rendererSettings</code>建立 MPNativeAdRendererConfiguration物件<br>
2.設置 rendering class 為本身class<br>
3.設置 rendererSettings 為參數傳入 的rendererSettings<br>
4.設置 supportedCustomEvents 為 TAMediaCustomNativeAdEvent class<br>
5.實作<code>initWithRendererSettings:</code>設置物件viewSizeHandler，以及任何客製化設定<br>
6.實作<code>retrieveViewWithAdapter:</code>回傳要來呈顯在畫面上的 View<br>
參考以下代碼<br>

   //  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<br>
1.建立 class 繼承 MPNativeCustomEvent<br>
2.複寫<code> - (void)requestAdWithCustomEventInfo:(NSDictionary *)info</code>在此用 TADNativeAd 去取得廣告<br>
3.取得廣告後用取得的 Dictionary 建立 TAMediaCustomNativeAdEventAdapter 後再用 adapter 建立MPNativeAd<br>
4.呈現廣告前先呼叫父類別<code>precacheImagesWithURLs:completionBlock:<code/>取得image後，再呼叫<code>customNativeEvent:didLoadAd:</code><br>

  #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