如何解决 "Member access into incomplete type" 错误

Question

我正在尝试将 iAd 集成到一个 cocos2d-x 项目中，如下所述： http://becomingindiedev.blogspot.com.es/2015/02/integrating-iad-in-cocos2d-x-v3x.html

AdBanner.h

 #import <Foundation/Foundation.h>  
 #import <iAd/iAd.h>  
 @class RootViewController;   
 @interface AdBanner : NSObject<ADBannerViewDelegate>  
 {  
   UIWindow* window;  
   RootViewController* rootViewController;  
   ADBannerView* adBannerView;  
   bool adBannerViewIsVisible;  
 }

AdBanner.mm

@implementation AdBanner

 -(id)init  
 {  
   if(self=[super init])  
   {  
     adBannerViewIsVisible = YES;  
     rootViewController =  
       (RootViewController*) [[[UIApplication sharedApplication] keyWindow] rootViewController];  
     window = [[UIApplication sharedApplication] keyWindow];  
     [self createAdBannerView];  
   }  
   return self;  
 }  

-(void)layoutAnimated:(BOOL)animated
{
    CGRect bannerFrame = adBannerView.frame;
    //Has the banner an advestiment?
    if ( adBannerView.bannerLoaded && adBannerViewIsVisible )
    {
        NSLog(@"Banner has advertisement");
        bannerFrame.origin.y = window.bounds.size.height - bannerFrame.size.height;
    } else
    {
        NSLog( @"Banner has NO advertisement" );
        //if no advertisement loaded, move it offscreen
        bannerFrame.origin.y = window.bounds.size.height;
    }
    [UIView animateWithDuration:animated ? 0.25 : 0.0 animations:^{
        [rootViewController.view layoutIfNeeded]; //Member access into incomplete type "RootViewController"
        adBannerView.frame = bannerFrame;
    }];
}
@end

AdBanner.mm 中底部的行给出了错误：

    [rootViewController.view layoutIfNeeded]; //Member access into incomplete type "RootViewController"

我该如何解决这个问题？

Answer 1

您已使用 @Class 指令在 .h 文件中将 RootViewController 声明为前向 class 声明，但您尚未在 RootViewController.h 中导入 RootViewController.h =22=] 文件.

这意味着编译器知道有一些 class RootViewController 但不知道关于它的更多信息 - 它的 superclass、方法或属性。因此它无法确认它实际上有一个方法 layoutIfNeeded.

将 #import "RootViewController.h" 添加到 ADBanner.mm 的顶部将为编译器提供所需的信息并解决错误。

如何解决 "Member access into incomplete type" 错误

How to resolve "Member access into incomplete type" error

ios

objective-c

iad

objective-c++