https://github.com/below/weaklink

A sample for a weak linking question
https://github.com/below/weaklink

Last synced: 8 months ago
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A sample for a weak linking question

• Host: GitHub
• URL: https://github.com/below/weaklink
• Owner: below
• License: unlicense
• Created: 2014-11-03T17:10:35.000Z (over 11 years ago)
• Default Branch: master
• Last Pushed: 2014-11-03T21:35:33.000Z (over 11 years ago)
• Last Synced: 2025-07-02T15:50:16.320Z (9 months ago)
• Language: Objective-C
• Size: 145 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
WeakLink

========

These projects demonstrate my question if `UIUserNotifications` can be weak linked directly, or if I have to use `NSClassFromString`, as I currently do as a workaround

In the [Documentation](https://developer.apple.com/library/ios/documentation/DeveloperTools/Conceptual/cross_development/Using/using.html "NextPrevious

Using SDK-Based Development") Apple says that:

> For iOS frameworks that support the `NS_CLASS_AVAILABLE` macro, conditionalize your code for weakly linked classes as demonstrated in the following example:

> `if ([UIPrintInteractionController class]) {

>     // Create an instance of the class and use it.

> } else {

>     // Alternate code path to follow when the

>     // class is not available.

> }`

Conditions for this are:

> * The base SDK for your Xcode project must be iOS 4.2 or newer.

> * The deployment target for your project must be iOS 3.1 or newer.

> * The compiler for your project must be the LLVM-GCC 4.2 compiler or newer, or the LLVM compiler (Clang) 1.5 or newer.

> * You must ensure that any frameworks not available in your project’s deployment target are weakly linked, rather than required.

However, for `UIUserNotificationSettings` I will get: `Undefined symbols for architecture armv7: "_OBJC_CLASS_$_UIUserNotificationSettings"` if linked for iOS 7.

Is this a bug?