我在iPad上运行时在应用程序中收到此错误：
Uncaught exception: CALayer position contains NaN
相同的代码在iPhone上运行良好.
- (void)mapView:(MKMapView *)mapView didAddAnnotationViews:(NSArray *)views
{
AnnotationView *aV;
for (aV in views) {
// Don't pin drop if annotation is user location
if ([aV.annotation isKindOfClass:[MKUserLocation class]]) {
continue;
}
// Check if current annotation is inside visible map rect,else go to next one
MKMapPoint point = MKMapPointForCoordinate(aV.annotation.coordinate);
if (!MKMapRectContainsPoint(mapViewResult.visibleMapRect,point)) {
continue;
}
CGRect endFrame = aV.frame;
// Move annotation out of view
// I checked here,CGRectEmpty returns true here
aV.frame = CGRectMake(aV.frame.origin.x,aV.frame.origin.y - self.view.frame.size.height,aV.frame.size.width,aV.frame.size.height);
// Animate drop
[UIView animateWithDuration:0.5 delay:0.04*[views indexOfObject:aV] options: UIViewAnimationOptionCurveLinear animations:^{
aV.frame = endFrame;
// Animate squash
}completion:^(BOOL finished){
if (finished) {
[UIView animateWithDuration:0.05 animations:^{
aV.transform = CGAffineTransformMakeScale(1.0,0.8);
}completion:^(BOOL finished){
if (finished) {
[UIView animateWithDuration:0.1 animations:^{
aV.transform = CGAffineTransformIdentity;
}];
}
}];
}
}];
}
}
我知道,分配的帧包含NaN值,我用CGRectEmpty函数检查了这个并将该帧设置为CGRectZero,但它不起作用.
我从这里得到了这个工作代码,https://stackoverflow.com/a/7045916/1603234
Backtrace / Debug Log
*** Terminating app due to uncaught exception 'CALayerInvalidGeometry',reason: 'CALayer position contains NaN: [594.947 nan]'
*** First throw call stack:
(
0 CoreFoundation 0x048551e4 __exceptionPreprocess + 180
1 libobjc.A.dylib 0x034ad8e5 objc_exception_throw + 44
2 CoreFoundation 0x04854fbb +[NSException raise:format:] + 139
3 QuartzCore 0x01a1be1a _ZN2CA5Layer12set_positionERKNS_4Vec2IdEEb + 190
4 QuartzCore 0x01a1bfd9 -[CALayer setPosition:] + 68
5 QuartzCore 0x01a1c6df -[CALayer setFrame:] + 799
6 UIKit 0x01fbbb4d -[UIView(Geometry) setFrame:] + 302
7 MyAppName 0x0026b025 -[ResultMapViewController mapView:didAddAnnotationViews:] + 2133
8 MapKit 0x01e0449b -[MKMapView annotationManager:didAddAnnotationRepresentations:] + 272
9 MapKit 0x01e3b53c -[MKAnnotationManager updateVisibleAnnotations] + 2052
10 Foundation 0x02ed6de7 __NSFireTimer + 97
11 CoreFoundation 0x04813ac6 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 22
12 CoreFoundation 0x048134ad __CFRunLoopDoTimer + 1181
13 CoreFoundation 0x047fb538 __CFRunLoopRun + 1816
14 CoreFoundation 0x047fa9d3 CFRunLoopRunSpecific + 467
15 CoreFoundation 0x047fa7eb CFRunLoopRunInMode + 123
16 GraphicsServices 0x03ccd5ee GSEventRunModal + 192
17 GraphicsServices 0x03ccd42b GSEventRun + 104
18 UIKit 0x01f60f9b UIApplicationMain + 1225
19 MyAppName 0x0001ba3d main + 141
20 MyAppName 0x000027e5 start + 53
)
libc++abi.dylib: terminating with uncaught exception of type NSException
解决方法
我的天啊！我不知道我能犯这样“愚蠢”的错误.
是的,有问题的句子相同的代码在iPhone上运行正常.我得到错误CALayer位置包含NaN,因为在我的自定义 – (AnnotationView *)mapView：(MKMapView *)mapView viewForAnnotation：(id)注释方法,我在哪里计算
annotationView.layer.anchorPoint = CGPointMake(0.5,1.0 - (diffFromBottom * 1.0)/annotationView.image.size.height);
annotationView.image是空白的,因为我忘了在iPad项目中添加图钉图像. iPhone代码就在那里.所以它除以零(0)并导致错误.
我把断点,和NSLog打印了解,
1.0 – (diffFromBottom * 1.0)/annotationView.image.size.height打印的值为-inf.这导致应用程序崩溃.
