Line Counting Function no longer works in Swift 3.0 - uilabel

Question

I had a function that I was using in Swift 2.2 that I never had any problems with, now I'm getting an error when I try to use it.
The code is to change the number of lines a UILabel has to accommodate the size of the string.
func countLabelLines(label: UILabel) -> Int {
if let text = label.text {
let myText = text as NSString
let attributes = [NSFontAttributeName: label.font]
let width = label.bounds.width
let height = CGFloat.greatestFiniteMagnitude
let size = CGSize(width: width, height: height)
let labelSize = myText.boundingRect(with: size, options: NSStringDrawingOptions.usesLineFragmentOrigin, attributes: attributes, context: nil) //Code errors here
let lines = ceil(CGFloat(labelSize.height) / label.font.lineHeight)
return Int(lines)
}
return 0
}
And this is my error message:
> 2016-10-14 09:47:37.213 EZ Lists[23136:1997134] -[_SwiftValue pointSize]: unrecognized selector sent to instance 0x608000247380
2016-10-14 09:47:37.218 EZ Lists[23136:1997134] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[_SwiftValue pointSize]: unrecognized selector sent to instance 0x608000247380'
*** First throw call stack:
(
0 CoreFoundation 0x000000010e2ef34b __exceptionPreprocess + 171
1 libobjc.A.dylib 0x000000010d93321e objc_exception_throw + 48
2 CoreFoundation 0x000000010e35ef34 -[NSObject(NSObject) doesNotRecognizeSelector:] + 132
3 CoreFoundation 0x000000010e274c15 ___forwarding___ + 1013
4 CoreFoundation 0x000000010e274798 _CF_forwarding_prep_0 + 120
5 UIFoundation 0x000000011362a2ba __NSStringDrawingEngine + 3204
6 UIFoundation 0x0000000113629610 -[NSString(NSExtendedStringDrawing) boundingRectWithSize:options:attributes:context:] + 202
7 EZ Lists 0x000000010d2beaf2 _TZFC8EZ_Lists11CustomFuncs15countLabelLinesfT5labelCSo7UILabel_Si + 1218
8 EZ Lists 0x000000010d2be0f2 _TZFC8EZ_Lists11CustomFuncs21fitLabelTextForHeightfT5labelCSo7UILabel10constraintCSo18NSLayoutConstraint11extraHeightV12CoreGraphics7CGFloat_T_ + 82
9 EZ Lists 0x000000010d2ce445 _TFC8EZ_Lists9AddItemVC21viewDidLayoutSubviewsfT_T_ + 309
10 EZ Lists 0x000000010d2ce472 _TToFC8EZ_Lists9AddItemVC21viewDidLayoutSubviewsfT_T_ + 34
11 UIKit 0x000000010eee73a8 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 1337
12 QuartzCore 0x000000011478dcdc -[CALayer layoutSublayers] + 146
13 QuartzCore 0x00000001147817a0 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 366
14 QuartzCore 0x000000011478161e _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 24
15 QuartzCore 0x000000011470f62c _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 280
16 QuartzCore 0x000000011473c713 _ZN2CA11Transaction6commitEv + 475
17 UIKit 0x000000010ee1c067 _UIApplicationFlushRunLoopCATransactionIfTooLate + 206
18 UIKit 0x000000010f62bb30 __handleEventQueue + 5672
19 CoreFoundation 0x000000010e294311 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
20 CoreFoundation 0x000000010e27959c __CFRunLoopDoSources0 + 556
21 CoreFoundation 0x000000010e278a86 __CFRunLoopRun + 918
22 CoreFoundation 0x000000010e278494 CFRunLoopRunSpecific + 420
23 GraphicsServices 0x0000000113f9da6f GSEventRunModal + 161
24 UIKit 0x000000010ee22f34 UIApplicationMain + 159
25 EZ Lists 0x000000010d2caa4f main + 111
26 libdyld.dylib 0x00000001120ce68d start + 1
27 ??? 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
I'm still pretty new at Xcode / Swift and I understand that one of my Arguments isn't right, but I don't understand which is the problem. After first I was thinking it was with the CGSize, but I broke that out into it's own line and that doesn't have an issue.

Answer 1

It's the font. The problem is this line:
let attributes = [NSFontAttributeName: label.font]
Try writing this:
let attributes = [NSFontAttributeName: label.font!]
I think the exclamation mark should fix it.