Question

我在使用ASIHttpRequst时遇到问题。这是我得到的错误：

2010-04-11 20:47:08.176 citybikesPlus[5885:207] *** -[CALayer rackDone:]: unrecognized selector sent to instance 0x464a890
2010-04-11 20:47:08.176 citybikesPlus[5885:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[CALayer rackDone:]: unrecognized selector sent to instance 0x464a890'
2010-04-11 20:47:08.176 citybikesPlus[5885:207] Stack: (
    33936475,
    2546353417,
    34318395,
    33887862,
    33740482,
    126399,
    445238,
    33720545,
    33717320,
    40085013,
    40085210,
    3108783,
    11168,
    11022
)

这是我的代码（部分内容）：

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{

 [image setImage:[UIImage imageNamed:@"bullet_rack.png"]];

 BikeAnnotation *bike = [[annotationView annotation] retain];

 bike._sub = @"";

    [super viewDidLoad];

 NSString *newUrl = [[NSString alloc] initWithFormat:rackUrl, bike._id];
 NSString *fetchUrl = [newUrl stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

 [networkQueue cancelAllOperations];
 [networkQueue setRequestDidFinishSelector:@selector(rackDone:)];
 [networkQueue setRequestDidFailSelector:@selector(processFailed:)];
 [networkQueue setDelegate:self];

 ASIFormDataRequest *request = [[[ASIFormDataRequest alloc] initWithURL:[NSURL URLWithString:fetchUrl]] retain];
 [request setDefaultResponseEncoding:NSUTF8StringEncoding];
 [networkQueue addOperation:request];

 [networkQueue go];
}

- (void)rackDone:(ASIHTTPRequest *)request
{
 NSString *resultSearch = [request responseString];

 NSData *data = [resultSearch dataUsingEncoding:NSUTF8StringEncoding];

 NSString *errorDesc = nil;
 NSPropertyListFormat format;
 NSDictionary * dict = (NSDictionary*)[NSPropertyListSerialization
            propertyListFromData:data
            mutabilityOption:NSPropertyListMutableContainersAndLeaves
            format:&format
            errorDescription:&errorDesc];

 rackXmlResult* fileResult = [[[rackXmlResult alloc] initWithDictionary:dict] autorelease];
 rackXmlSet *rackSet = [fileResult getRackResult];

 NSString *subString = [[NSString alloc] initWithFormat:@"Cyklar tillgängligt: %@ -- Lediga platser: %@", rackSet._ready_bikes, rackSet._empty_locks];

 [activity setHidden:YES];
 [image setHidden:NO];

 BikeAnnotation *bike = [annotationView annotation];

 bike._sub = subString;
}

- (void) processFailed:(ASIHTTPRequest *)request
{
 UIAlertView *errorView;

 NSError *error = [request error];
 NSString *errorString = [error localizedDescription];

 errorView = [[UIAlertView alloc]
     initWithTitle: NSLocalizedString(@"Network error", @"Network error")
     message: errorString
     delegate: self
     cancelButtonTitle: NSLocalizedString(@"Close", @"Network error") otherButtonTitles: nil];

 [errorView show];
 [errorView autorelease];
}

当我在mapview中加载注释时，该过程在标注气泡中作为LeftCalloutView加载，因此非常多（80次左右）。它旨在从服务器检索XML Plist，解析它并使用数据......但它在rackDone中消失：

有人有什么想法吗？

此致保罗佩伦

Answer 1

嗯，问题似乎是你的networkQueue对象（无论是NSOperationsQueue的子类？）是将rackDone:消息发送到viewController的视图而不是viewController本身。 CALayers是视图的属性而不是viewControllers，因此错误必须来自视图。

检查networkQueue。

的代码

您似乎也没有对self使用networkQueue表示法，如果它是该类的属性，它可能会在没有警告的情况下死亡，因为它没有被正确保留。

Answer 2

我使用[self retain]找到了解决方案。看起来因为我经常加载对象，所以它不会自己分配足够长的时间来接收rackDone：action。

现在有效。现在我只需要弄清楚如何根据请求加载它，而不是在应用程序加载时。

ASIHttpRequest问题。 “无法识别的选择器发送到实例”

2 个答案: