ios 8.1 fatal error:value failed to bridge from Swift type to a Objective-C type

[tcper]

in ChartXAxisRenderer
the exc_bad_instruction line:
let labelSize = widthText.sizeWithAttributes([NSFontAttributeName: _xAxis.labelFont])

but in ios 9.2, there is no error here, but how to fix it ?

[tcper]

I fixed it by using :

let dict = [NSFontAttributeName: _xAxis.labelFont]
let labelSize = widthText.sizeWithAttributes(dict)

the very same meaning code, but it won't crash now, I don't know why

[danielgindi]

It's a Swift Compiler optimization bug. We have encountered such in another place. Apple fixes them from time to time. Please try to run it in latest Xcode beta - and let us know if they fixes this one :-)