Method load() defines Objective-C class method ‘load’, which is not permitted by Swift 1.2

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There is an NSHispster article about method swizzling that touches on this in different context:

Unfortunately, a load class method implemented in Swift is never
called by the runtime, rendering that recommendation an impossibility.
Instead, we’re left to pick among second-choice options:

  • Implement method swizzling in initialize. This can be done safely, so long as you check the type at execution time and wrap the swizzling in
    dispatch_once (which you should be doing anyway).

  • Implement method swizzling in the app delegate. Instead of adding method swizzling via a class extension, simply add a method to the app
    delegate to be executed when
    application(_:didFinishLaunchingWithOptions:) is called. Depending on
    the classes you’re modifying, this may be sufficient and should
    guarantee your code is executed every time.

Link: http://nshipster.com/swift-objc-runtime/

–

More info form dev forums:

Swift 1.1 allowed you to define “+load” methods with “class func
load()”, but they were not actually run at startup time of your app
like Objective-C +load methods are. Swift 1.2 bans them to avoid the
impression that this might work.

Link: https://devforums.apple.com/message/1102025#1102025

–

tl;dr initialize() and didFinishLaunchingWithOptions seem to be decent places for such things in Swift.

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