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) ==
1.建立一class實做MPNativeAdAdapter protocol，protocol有兩必須實作property:properties及defaultActionURL，此class是作為Tamedia native ad與MPNativeAd的橋樑<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 "MPNativeAdAdapter.h"
   #import "TADNativeAd.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 ()   
   @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,
                                           @"IMAGE960X640":@"IMAGE960X640",
                                           @"IMAGE1280X720":@"IMAGE1280X720",
                                           @"ICONRECTANGLE":@"ICONRECTANGLE",
                                           @"SHORTSUBJECT":@"SHORTSUBJECT",
                                           @"IMAGE720X1280":@"IMAGE720X1280",
                                           @"IMAGE640X960":@"IMAGE640X960"};
       
       NSMutableDictionary *dic = [NSMutableDictionary new];
       for (NSString *key in taDic.allKeys) {
           [dic setObject:taDic[key] forKey:taMeidaDicMapping[key]];
       }
       _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,與指定需要來呈現的View，亦可用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，用於回傳所需要的AdView以及設置客製化事件處理的class<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 "MPNativeAdRenderer.h"
   @interface TAMediaCustomNativeAdRenderer : NSObject <MPNativeAdRenderer>
   
   @property (nonatomic, readonly) MPNativeViewSizeHandler viewSizeHandler;
   
   @end

   //  TAMediaCustomNativeAdRenderer.m
   #import "TAMediaCustomNativeAdRenderer.h"
   #import "MPNativeAdRendererConfiguration.h"
   #import "MPNativeAdRendererSettings.h"
   #import "MPNativeAdRendering.h"
   #import "MPNativeAdAdapter.h"
   #import "MPNativeAdConstants.h"
   #import "MPNativeAdView.h"
   #import "MPNativeAdRendererImageHandler.h"
   #import "MPNativeAdRenderingImageLoader.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'''
       adView.nativeTitleTextLabel.text = adapter.properties[kAdTitleKey];
       adView.nativeMainTextLabel.text = adapter.properties[kAdTextKey];
       [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>

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

   //  TAMediaCustomNativeAdEvent.m
   #import "TAMediaCustomNativeAdEvent.h"
   #import "TAMediaCustomNativeAdEventAdapter.h"
   #import "MPNativeAdConstants.h"
   #import "MPNativeAd.h"
   #import "MPNativeAdError.h"
   
   @implementation TAMediaCustomNativeAdEvent
   
   - (void)requestAdWithCustomEventInfo:(NSDictionary *)info {
       TADRequest *request = [TADRequest request];
       request.testing = NO;
       // Type: TADGender
       request.gender = kTADGenderUnknown;
       
       // Set birthday
       [request setBirthdayWithYear:1988 month:6 day:11];
       
       // Set location
       [request setLocationWithLatitude:25.033534 longitude:121.534791 accuracy:1];
       // NAD 物件初始化, 帶入自訂的origin
       if (!nativeAd) {
           nativeAd = [[TADNativeAd alloc] initWithAdUnitId:info[@"NativeId"]];'''//NativeId在MoPub內設定'''
       }
       // 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, 藉由 getNativeAdContent 取得包含回覆內容的 NSDictionary
       NSDictionary *nadDic = [nativeAd getNativeAdContent];  
       TAMediaCustomNativeAdEventAdapter *adapter = [[TAMediaCustomNativeAdEventAdapter alloc] initWithTADic:nadDic];
       MPNativeAd *mpNativeAd = [[MPNativeAd alloc] initWithAdAdapter:adapter];
       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