sublayer with non-finite position [inf inf]

问题:

I am using a third CocoaPods library written in Objective-C to take a screenshot of a UITextView. It was OK for iOS 8, but after I change the syntax for iOS 9 and Swift 2, it throws an error:

Terminating app due to uncaught exception 'CALayerInvalidGeometry', reason: 'sublayer with non-finite position [inf inf]'

Here is the code from the library:

- (UIImage *)screenshotForCroppingRect:(CGRect)croppingRect
{
    UIGraphicsBeginImageContextWithOptions(croppingRect.size, NO, [UIScreen mainScreen].scale);
    // Create a graphics context and translate it the view we want to crop so
    // that even in grabbing (0,0), that origin point now represents the actual
    // cropping origin desired:
    CGContextRef context = UIGraphicsGetCurrentContext();
    if (context == NULL) return nil;

    NSLog(@"hiii :%f" , croppingRect.size.width);

    CGContextTranslateCTM(context, -croppingRect.origin.x, -croppingRect.origin.y);

    [self layoutIfNeeded];
    [self.layer renderInContext:context];

    UIImage *screenshotImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return screenshotImage;
}

The problem is this line:

[self.layer renderInContext:context];

I realize this is because I am trying to take a snapshot of the UIView which contain a UIScrollView. If I remove the UIScrollView subview, the error is gone.

So what does this mean?

sublayer with non-finite position [inf inf]

Anyone having the same issue and how did you solve it?

回答1:

Here is how I solved this:

Following this post

https://github.com/facebook/ios-snapshot-test-case/issues/112

the error is coming from the library I used, so do a search on all the files and find out

CGRectNull

and change them all to

CGRectZero

That resolved the problem.