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iOS Enhance a Weather App with Table Views Upgrading Stormy Custom Background Views

Posted by Joshua Rapoport
Joshua Rapoport
8,415 Points

Drawing Code for Linear Gradient isn't working

I'm using Xcode 7 for this course, so I found that part of my code wouldn't compile. This is the drawing code for a linear gradient which provided for both Xcode 6 and 7. I tried both. The snippet for Xcode 6 gave a compiler error for the constants kCGGradientDrawsBeforeStartLocation and kCGGradientDrawsAfterEndLocation. The Xcode 7 snippet, contained in a project download, compiled, but no gradient appeared in the WeeklyTableViewController. HEEEEEEEEELLLP!!!

4 Answers

Nathan Tallack
Nathan Tallack
22,160 Points
Nathan Tallack
Nathan Tallack
22,160 Points

For some reason the constants are not available to the function. No idea why.

I managed to get it working by calling it with the built in option flag. Unfortunatly it seems you can only call either drawsbefore or drawsafter, looks like you cant call both. Looks ok just calling drawsafter though.

So, replace the line

UInt32(kCGGradientDrawsBeforeStartLocation) | UInt32(kCGGradientDrawsAfterEndLocation))

with

CGGradientDrawingOptions.DrawsAfterEndLocation)

Giedrius Zavadskas
Giedrius Zavadskas
6,427 Points
Giedrius Zavadskas
Giedrius Zavadskas
6,427 Points

HI

Replace this: UInt32(kCGGradientDrawsBeforeStartLocation) | UInt32(kCGGradientDrawsAfterEndLocation))

with this: [.DrawsAfterEndLocation, .DrawsBeforeStartLocation])

Tommy Choe
Tommy Choe
38,156 Points
Tommy Choe
Tommy Choe
38,156 Points

Hey all, just wanted to let you know that Pasan answered this question on this forum post: https://teamtreehouse.com/community/use-of-unresolved-identifier-kcggradientdrawsbeforestartlocation

He explains why its not working.

Hope that helps.

Ramesh VJ
Ramesh VJ
2,201 Points
Ramesh VJ
Ramesh VJ
2,201 Points

@ Nathan Tallack : It worked on Xcode 7. Thanks for ur help.