ios 如何解决CALayerInvalidGeometry'，原因：'CALayer position contains NaN: [nan nan]？
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How to solve CALayerInvalidGeometry', reason: 'CALayer position contains NaN: [nan nan]?
提问by sihao
I have an error where it crash the application when it is starting up. This is the error that i got:
我有一个错误，它在启动时使应用程序崩溃。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
i tried using Exception breakpoint and it doesn't show which part of the code has gone wrong.It only stop at this point -0xbc74e: movl $0, %eax-
我尝试使用异常断点，并没有显示这部分代码在这一点上-0xbc74e已经wrong.It唯一的一站：MOVL $ 0％eax-
How can i solve it? Please help.
我该如何解决？请帮忙。
*edit
*编辑
I found the part which throws the exception but i can't see what is wrong
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;
}
This line is causing the error self.mapView.layerDelegate = self;which by default call the method mapViewDidLoad
此行导致错误self.mapView.layerDelegate = self;，默认情况下调用该方法mapViewDidLoad
回答by Nilesh Tripathi
I think this error occurs because the layer which is executed has frame in this form:
我认为发生此错误是因为执行的层具有这种形式的框架：
Layer frame == {{inf, inf}, {0, 0}}
层框架 == {{inf, inf}, {0, 0}}
Here inf is infimum. Its set of numbers.
这里 inf 是下界。它的一组数字。
So the solution to avoid this kind of issue just create condition before return of layer. Like as:
因此，避免此类问题的解决方案只是在层返回之前创建条件。像这样：
if (layer.frame.size.width ==0 || layer.frame.size.height ==0 ) {
return [self simpleLayer];
}else{
return layer;
}
Where simple layer is like as :
简单层就像这样：
-(CALayer *)simpleLayer{
CALayer *layer = [[CALayer alloc] init];
[layer setFrame:CGRectMake(0, 0, 10, 10)];
[layer setHidden:TRUE];
return layer;
}
This condition solved my issue. Try it.
这个条件解决了我的问题。尝试一下。
回答by Andrew Bennett
For me it was caused by the toView in this code being nil:
对我来说，这是由此代码中的 toView 为零引起的：
[UIView transitionFromView:self.fromView
toView:self.toView
duration:0.6
options:(currentPage > toPage ? UIViewAnimationOptionTransitionCurlDown : UIViewAnimationOptionTransitionCurlUp)
completion:^(BOOL finished) {
if (finished) {
}
}
回答by yoninja
I know this question is not very recent but I just want to give an answer. Anyway, I'm guessing your mapViewis of AGSMapViewand you have initialized it this way:
我知道这个问题不是最近出现的，但我只是想给出一个答案。无论如何，我猜你mapView是的AGSMapView并且你已经这样初始化了：
self.mapView = [[[AGSMapView alloc] init] autorelease];
Now, I think the better, if not the only correct way, to initialize it is using initWithFrame. Though I'm not sure why, mapViewis broken if you use initfor the initialization.
现在，我认为更好的，如果不是唯一正确的方法，初始化它是使用initWithFrame. 虽然我不确定为什么，但mapView如果您init用于初始化，则会损坏。
Hope this helps.
希望这可以帮助。
