我有一个带列表/详细信息视图的简单应用。在详细视图中，我有1个webview，还显示1个iAd。当我在列表/详细信息视图之间切换时，我的应用程序有时会崩溃。我的iAd代码似乎有问题。请你解决它。 我尝试使用泄漏，但我无法完全弄明白。
以下是更新的代码;
@interface DetailController : UIViewController <UIWebViewDelegate,ADBannerViewDelegate> {
NSString *selectedTxt;
IBOutlet UIWebView* webView;
ADBannerView *adView_;
BOOL bannerIsVisible;
}
@property(nonatomic,retain) NSString *selectedTxt;
@property(nonatomic,retain) UIWebView* webView;
@property (nonatomic,retain) ADBannerView *adView;
@property (nonatomic,assign) BOOL bannerIsVisible;
@end
实施
@implementation DetailController
@synthesize selectedTxt;
@synthesize webView,bannerIsVisible;
@synthesize adView = adView_;
/*
// The designated initializer. Override if you create the controller programmatically and want to perform customization that is not appropriate for viewDidLoad.
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
if ((self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil])) {
// Custom initialization
}
return self;
}
*/
- (void) viewWillAppear:(BOOL)animated {
bannerIsVisible = YES;
adView_ = [[ADBannerView alloc] initWithFrame:CGRectZero];
float origin_y;
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone)
origin_y = 360.0;
else
origin_y = self.view.frame.size.height;
adView_.frame = CGRectMake(0.0,origin_y, adView_.frame.size.width, adView_.frame.size.height);
if ( &ADBannerContentSizeIdentifierPortrait != NULL ) {
adView_.requiredContentSizeIdentifiers = [NSSet setWithObject:ADBannerContentSizeIdentifierPortrait];
adView_.currentContentSizeIdentifier = ADBannerContentSizeIdentifierPortrait;
} else {
adView_.requiredContentSizeIdentifiers = [NSSet setWithObject:ADBannerContentSizeIdentifier320x50];
adView_.currentContentSizeIdentifier = ADBannerContentSizeIdentifier320x50;
}
adView_.delegate = self;
[webView addSubview:adView_];
[self.view bringSubviewToFront:adView_];
self.bannerIsVisible=NO;
[super viewWillAppear: animated];
}
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
//Set the title of the navigation bar
//self.navigationItem.title = @"Selected Country";
[super viewDidLoad];
}
/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations
return YES;
}
*/
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
- (void)viewDidUnload {
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
adView_.delegate = nil;
self.adView = nil;
}
- (void)dealloc {
adView_.delegate = nil;
[adView_ release];
[super dealloc];
}
- (void)bannerView:(ADBannerView *)banner didFailToReceiveAdWithError:(NSError *)error
{
if (bannerIsVisible)
{
[UIView beginAnimations:@"animateAdBannerOff" context:NULL];
// assumes the banner view is at the bottom of the screen.
banner.frame = CGRectOffset(banner.frame, 0, 50); // if the banner is on top of the screen use -50
[UIView commitAnimations];
bannerIsVisible = NO;
}
}
- (void)bannerViewDidLoadAd:(ADBannerView *)banner
{
if (!bannerIsVisible)
{
[UIView beginAnimations:@"animateAdBannerOn" context:NULL];
// assumes the banner view is offset -50 pixels so that it is not visible.
banner.frame = CGRectOffset(banner.frame, 0, -50); // if the banner is on top of the screen use 50
[UIView commitAnimations];
bannerIsVisible = YES;
}
}
- (BOOL)bannerViewActionShouldBegin:(ADBannerView *)banner willLeaveApplication:(BOOL)willLeave
{
NSLog(@"Banner view is beginning an ad action");
BOOL shouldExecuteAction = YES; // your application implements this method if you want it not fixed
if (!willLeave && shouldExecuteAction)
{
// insert code here to suspend any services that might conflict with the advertisement
}
return shouldExecuteAction;
}
@end
错误记录
2011-12-17 20:33:23.142 MyApp[4382:207] ADBannerView: WARNING A banner view (0x6236190) has an ad but may be obscured. This message is only printed once per banner view.
[Switching to process 4382 thread 0x920f]
2011-12-17 20:34:14.154 MyApp[4382:207] -[__NSCFType bannerViewDidLoadAd:]: unrecognized selector sent to instance 0x62542f0
2011-12-17 20:34:14.195 MyApp[4382:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFType bannerViewDidLoadAd:]: unrecognized selector sent to instance 0x62542f0'
*** Call stack at first throw:
(
0 CoreFoundation 0x00e025a9 __exceptionPreprocess + 185
1 libobjc.A.dylib 0x00f56313 objc_exception_throw + 44
2 CoreFoundation 0x00e040bb -[NSObject(NSObject) doesNotRecognizeSelector:] + 187
3 CoreFoundation 0x00d73966 ___forwarding___ + 966
4 CoreFoundation 0x00d73522 _CF_forwarding_prep_0 + 50
5 CoreFoundation 0x00d72c7d __invoking___ + 29
6 CoreFoundation 0x00d72b51 -[NSInvocation invoke] + 145
7 CoreFoundation 0x00d73a04 ___forwarding___ + 1124
8 CoreFoundation 0x00d73522 _CF_forwarding_prep_0 + 50
9 iAd 0x000149f9 -[ADDistributedMessagingCenter messagePort:receivedMessage:withData:] + 251
10 iAd 0x00015012 ADMessagePortCallBack + 75
11 CoreFoundation 0x00db9f4c __CFMessagePortPerform + 396
12 CoreFoundation 0x00de3944 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
13 CoreFoundation 0x00d43cf7 __CFRunLoopDoSource1 + 215
14 CoreFoundation 0x00d40f83 __CFRunLoopRun + 979
15 CoreFoundation 0x00d40840 CFRunLoopRunSpecific + 208
16 CoreFoundation 0x00d40761 CFRunLoopRunInMode + 97
17 GraphicsServices 0x033ff1c4 GSEventRunModal + 217
18 GraphicsServices 0x033ff289 GSEventRun + 115
19 UIKit 0x00300c93 UIApplicationMain + 1160
20 MyApp 0x00002440 main + 102
21 MyApp 0x000023d1 start + 53
)
terminate called after throwing an instance of 'NSException'
[Switching to process 4382 thread 0x207]
答案 0 :(得分：0)
您没有发布您的iAd实例。
在您的DetailController接口声明（.h）;
中@interface DetailController ...
{
...
//note, we are using an instance variable with the trailing underscore
ADBannerView *adView_;
}
//note, we are using an accessor without that trailing underscore - those are
//glued together using the synthesize mechanics within the implementation
@property (nonatomic,retain) ADBannerView *adView;
...
@end
在你的DetailController实现（.m）;
中@implementation DetailController
//this will glue the instance variable with our property accessor
@sythesize adView = adView_;
...
-(void)viewDidLoad
{
[super viewDidLoad];
//retained by alloc/init, hence no need for using the retain by the accessor
adView_ = [[ADBannerView alloc] initWithFrame:CGRectZero];
//note, in case you want this adbanner to be initialized at a different point,
//like for example in viewWillAppear that you have to consider its former instance.
//to be on the safe side, you could prefix the above init with a [adView release];
...
}
-(void)viewDidUnload
{
[super viewDidUnload];
//as always, make sure the delegate is invalidated
adView_.delegate = nil;
//use accessor mechanics to release and invalidate for convenience
self.adView = nil;
}
-(void)dealloc
{
//to be on the safe side, make sure the adview is released even if
//viewDidUnload was not called
//e.g. nested viewControllers omitting viewDidUnload pass on
//as always, make sure the delegate is invalidated
adView_.delegate = nil;
//do NOT use accessor mechanics within init or dealloc for safety reasons
[adView_ release];
[super dealloc];
}
@end