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weak 参照してはいけない Cocoa のクラス一覧

Last updated at Posted at 2013-05-24

Transitioning to ARC Release Notes によれば、 OS X 10.8 において以下のクラスが weak 参照に対応していない:

  • NSATSTypesetter
  • NSColorSpace
  • NSFont
  • NSMenuView
  • NSParagraphStyle
  • NSSimpleHorizontalTypesetter
  • NSTextView

OS X 10.7 では、上記に加えてこれらのクラスも weak 参照してはならない:

  • NSFontManager
  • NSFontPanel
  • NSImage
  • NSTableCellView
  • NSViewController
  • NSWindow
  • NSWindowController
  • AV Foundation のすべてのクラス

weak 参照した場合 "cannot form weak reference to instance (<address>) of class <ClassName>" とランタイムエラーが発生する。

これらのクラスを弱参照したい場合は、変数を __unsafe_unretained で修飾するか、プロパティ属性を unsafe_unretained (または assign)にすること。参照はゼロ化されないことに注意。

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