Xcode Version 6.1 (6A1030) - Apple MACh O-Linker Error - Building

Xcode Version 6.1 (6A1030) - Apple Mach O-Linker Error - Building

As usual when upgrading Xcode:

Clean your build folder (Product -> (Alt key) -> Clean Build Folder)
Clean project (Product -> Clean)
Delete derived data
- Xcode < 6.3: Window -> Organizer -> Delete derived data
- Xcode >= 6.3: Window -> Projects (select project) -> Delete derived data

Then try to build your project again.

You have mainly 3 problems,

Failable Initializers.

As mentioned in this article. Swift 1.1 introduces Failable Initializers. It means, initializer can fail and return nil. You have to check it is not nil and unwrap it. This applies to:
```
error: value of optional type 'UIImage?' not unwrapped; did you mean to use '!' or '?'?
error: 'NSURL?' does not have a member named 'lastPathComponent'
```

CFString handling bug
See this question:Type 'CFStringRef' does not conform to protocol 'Hashable' in Xcode 6.1. This applies to:

error: type 'CFString!' does not conform to protocol 'NSCopying'
error: type 'CFString!' does not conform to protocol 'Hashable'

The workaround would be like:

curFrameGIFProperties[kCGImagePropertyGIFUnclampedDelayTime as NSString]
                                                            ^^^^^^^^^^^

enum raw value interface change
This applies to:

error: method 'fromRaw' has been replaced with a property 'rawValue'

Instead of toRaw() method, use rawValue property:

dictParams += ["category":self.category.rawValue]