如何解决CALayerInvalidGeometry',原因:'CALayer位置包含NaN:[nan nan]?

时间:2012-07-18 01:33:45

标签: objective-c ios xcode4.3 arcgis

我有一个错误,它在应用程序启动时崩溃。 这是我得到的错误:

*** Terminating app due to uncaught exception 'CALayerInvalidGeometry', reason: 'CALayer position contains NaN: [nan nan]'
*** First throw call stack:
(0x250b022 0x2709cd6 0x24b3a48 0x24b39b9 0x217ec0d 0x2174f55 0x158f3f7 0xbc74e 0xbe512 0xbfa26 0xbe4ad 0x224ffda 0x224f956 0x224e449 0x224ab9a 0x24df970 0x247f1c1 0x2442967 0x2441d84 0x2441c9b 0x2c0a7d8 0x2c0a88a 0x1559626 0x2aed 0x2a65)
terminate called throwing an exception

我尝试使用异常断点并且它没有显示代码的哪个部分出错。它只在此时停止-0xbc74e:movl $ 0,%eax-

我该如何解决?请帮忙。

*修改

我找到了抛出异常的部分,但我看不出有什么问题

- (void)viewDidLoad {
[super viewDidLoad];
[self.activityView startAnimating];
self.mapView.layerDelegate = self;
self.mapView.touchDelegate = self;
self.mapView.calloutDelegate = self;

NSURL *mapUrl = [NSURL URLWithString:kTiledMapServiceURL];
AGSTiledMapServiceLayer *tiledLyr = [AGSTiledMapServiceLayer tiledMapServiceLayerWithURL:mapUrl];
[self.mapView addMapLayer:tiledLyr withName:@"Tiled Layer"];
        .
        .
        .
}
- (void)mapViewDidLoad:(AGSMapView *)mapView {

AGSEnvelope *envelope = [[AGSEnvelope alloc]initWithXmin:29757.610204117 ymin:40055.0379682464 xmax:29884.6992302249 ymax:40236.6028660071 spatialReference:self.mapView.spatialReference];

//call method to set extent, pass in envelope
[self.mapView zoomToEnvelope:envelope animated:YES];

self.mapView.callout.width = 195.0f;
self.mapView.callout.accessoryButtonHidden = YES;

[self.mapView.gps start];
[self.mapView centerAtPoint:self.mapView.gps.currentPoint animated:YES];  

[self.activityView stopAnimating];
self.activityView.hidden = YES;

}

此行导致错误self.mapView.layerDelegate = self;,默认情况下调用方法mapViewDidLoad

3 个答案:

答案 0 :(得分:4)

我认为发生此错误是因为执行的图层具有以下形式的框架:

图层框架== {{inf,inf},{0,0}}

这里inf是下限。它的数字集。

因此,避免此类问题的解决方案只是在返回图层之前创建条件。 像:

if (layer.frame.size.width ==0 || layer.frame.size.height ==0 ) {
    return [self simpleLayer];
}else{
    return layer;        
} 

简单图层如下:

-(CALayer *)simpleLayer{
    CALayer *layer = [[CALayer alloc] init];
    [layer setFrame:CGRectMake(0, 0, 10, 10)];
    [layer setHidden:TRUE];
    return layer;
}

这个条件解决了我的问题。试试吧。

答案 1 :(得分:1)

对我而言,这是由于此代码中的toView为nil:

    [UIView transitionFromView:self.fromView
                        toView:self.toView
                      duration:0.6
                       options:(currentPage > toPage ? UIViewAnimationOptionTransitionCurlDown : UIViewAnimationOptionTransitionCurlUp)
                    completion:^(BOOL finished) {
                        if (finished) {
                        }
                    }

答案 2 :(得分:-1)

我知道这个问题不是很近,但我只是想给出答案。无论如何,我猜测你的mapViewAGSMapView并且你已经用这种方式对其进行了初始化:

self.mapView = [[[AGSMapView alloc] init] autorelease];

现在,我认为初始化它的更好(如果不是唯一正确的方法)是使用initWithFrame。虽然我不确定原因,但如果您使用mapView进行初始化,init会被破坏。

希望这有帮助。