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These classes include NSTextView, NSFont and NSColorSpace; for the full list, see Transitioning to ARC Release Notes. 但是如果你真的想在这些类中使用weak进行修饰,可以使用不安全的 阅读全文
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Asset iPhone 6s Plus and iPhone 6 Plus (@3x) iPhone 6s, iPhone 6, and iPhone 5 (@2x) iPhone 4s (@2x) iPad and iPad mini (@2x) iPad 2 and iPad mini (@1 阅读全文
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Table A-1 Device frameworks Name First available Prefixes Description Accelerate.framework 4.0 cblas, vDSP Contains accelerated math and DSP functions 阅读全文