在viewWillDisappear上删除AdBannerView并在viewWillAppear上重新添加它是一个好的

Question

我目前正在代码中执行以下操作，以避免"模糊"广告的问题。但这是一个好的做法吗？一个潜在的问题是，假设在viewWillDisappear之前，有一个广告请求发出，然后当广告返回时，adBannerView实例已经不见了。这会是个大问题吗？我应该只做hideAdBanner吗？

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear: animated]; 
    // create the ad banner view
    [self createAdBannerView];
    if (adBannerView != nil) {
       UIInterfaceOrientation orientation = self.interfaceOrientation;
       [self changeBannerOrientation:orientation];
    }
} 
- (void)viewWillDisappear:(BOOL)animated { 
    [super viewWillDisappear:animated]; 
    // iAd
    if (adBannerView != nil) {
        [self hideAdBanner];
        adBannerView.delegate = nil;
        [adBannerView release];
        adBannerView = nil;
    }
} 

Answer 1

我为广告横幅使用了一个singleton，并在每个ViewDidLoad上将其调用到视图中。这会自动将其从上一个视图中删除。

这是为adWhirl，但你应该能够采用它只是iAD。

adWhirlSingleton.h

#import <Foundation/Foundation.h>
#import "AdWhirlDelegateProtocol.h"
#import "AdWhirlView.h"
@interface adWhirlSingleton : NSObject <AdWhirlDelegate> {
    AdWhirlView *awView;
    UIViewController *displayVC;
}
@property (strong, nonatomic) AdWhirlView *awView;
@property (strong, nonatomic) UIViewController *displayVC;
+(id)sharedAdSingleton;
-(void)adjustAdSize:(CGFloat)x:(CGFloat)y;
@end

adWhirlSingleton.m

#import "adWhirlSingleton.h"
@implementation adWhirlSingleton
static adWhirlSingleton* _sharedAdSingleton = nil;
@synthesize awView, displayVC;
+(id)sharedAdSingleton
{
    @synchronized(self)
    {
        if(!_sharedAdSingleton)
            _sharedAdSingleton = [[self alloc] init];
        return _sharedAdSingleton;
    }
    return nil;
}
+(id)alloc
{
    @synchronized([adWhirlSingleton class])
    {
        NSAssert(_sharedAdSingleton == nil, @"Attempted to allocate a second instance of a singleton.");
                 _sharedAdSingleton = [super alloc];
                 return _sharedAdSingleton;
    }
    return nil;
}
-(id)init
{
    self = [super init];
    if (self != nil) {
        // initialize stuff here
        self.awView = [AdWhirlView requestAdWhirlViewWithDelegate:self];
    }
    return self;
}
-(void)dealloc
{
    displayVC = nil;
    if (awView) {
        [awView removeFromSuperview]; //Remove ad view from superview
        [awView replaceBannerViewWith:nil];
        [awView ignoreNewAdRequests]; // Tell adwhirl to stop requesting ads
        [awView setDelegate:nil];
        awView = nil;
    }
}
-(void)adjustAdSize:(CGFloat)x :(CGFloat)y
{
    [UIView beginAnimations:@"AdResize" context:nil];
    [UIView setAnimationDuration:0.7];
    awView.frame = CGRectMake(x, y, kAdWhirlViewWidth, kAdWhirlViewHeight);
    [UIView commitAnimations];
    NSLog(@"Recent Network Name: %@",[awView mostRecentNetworkName]);
}
-(BOOL)adWhirlTestMode
{
    return YES;
}
-(NSString *)adWhirlApplicationKey
{
    return @"xxxxxxxxxxxxx";
}
-(UIViewController *)viewControllerForPresentingModalView
{
    return displayVC;
}
-(void)adWhirlDidReceiveAd:(AdWhirlView *)adWhirlView
{
    NSLog(@"%s",__FUNCTION__);
    NSLog(@"Recent Network Name: %@",[awView mostRecentNetworkName]);
    //[self adjustAdSize];
}
-(void)adWhirlDidFailToReceiveAd:(AdWhirlView *)adWhirlView usingBackup:(BOOL)yesOrNo
{
    NSLog(@"%s",__FUNCTION__);
}
@end

然后将adWhirlSingleton导入每个ViewController，在每个viewWillAppear中，我只实现了这个：

adWhirlSingleton *adWhirlSingle = [adWhirlSingleton sharedAdSingleton];
        adWhirlSingle.displayVC = self;
        [adWhirlSingle adjustAdSize:0 :self.view.frame.size.height -50];
        [self.view addSubview:adWhirlSingle.awView];
        [self.view bringSubviewToFront:adWhirlSingle.awView];
        NSLog(@"Ad Banner View");

但是我使用UITableView的视图，我使用这个：

adWhirlSingleton *adWhirlSingle = [adWhirlSingleton sharedAdSingleton];
    adWhirlSingle.displayVC = self;
    [adWhirlSingle adjustAdSize:0 :self.tabBarController.view.frame.size.height -99];
    [self.tabBarController.view addSubview:adWhirlSingle.awView];
    NSLog(@"Should have added Ad!");

希望这能帮你一点

Answer 2

出于兴趣，为什么要删除ADBannerView？

苹果表示，您应该跨视图共享ADBannerView实例。

从文档中："如果您的应用程序有多个选项卡或视图显示iAd横幅，请确保在每个视图中共享一个ADBannerView实例。"

即，苹果认为你应该在视图层次结构的顶部/前部显示ADBannerView，并在没有广告显示时将其移出屏幕。

因此，为了回答这个问题，"删除然后再添加它是不是不好的做法？"是的，苹果会说是的。