iOS13 CoreText 被负优化了 - V2EX
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MengQuadra
V2EX    iOS

iOS13 CoreText 被负优化了

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  •   MengQuadra Sep 21, 2019 4654 views
    This topic created in 2441 days ago, the information mentioned may be changed or developed.
    今天 Xcode11 正式版发布了, 就赶紧试了一波
    swift5 用 CoreText 的 CTFrameGetVisibleStringRange 对大约 40MB 的 utf8 文本进行分页
    X与模拟器的速度均从 8s+掉到了 11s+

    之前在 Xcode10 + iOS 12.4 上的速度一直稳定 8s+
    机器是 Mac mini 2018, CPU 顶配

    感觉有点慌
  • coretext
  • xcode11
  • xcode10
  • UTF8
    6 replies    2019-10-06 09:05:01 +08:00
    damngood
        1
    damngood  
       Sep 21, 2019
    不慌，反正都是后台运行，多个几秒就几秒
    damngood
        2
    damngood  
       Sep 21, 2019
    但是这个比重的 Performance Degradation 估计还是哪里出了问题吧.
    MarginK
        3
    MarginK  
       Sep 21, 2019
    Xcode11 他累了
    Zhengqing
        4
    Zhengqing  
       Sep 21, 2019 via iPhone
    Wow 竟然完美的打出了 XR 牛逼
    MengQuadra
        5
    MengQuadra  
    OP
       Oct 6, 2019
    @Zhengqing 这个是 unicode 里面的拉丁字母小型大小, 可以查到的
    MengQuadra
        6
    MengQuadra  
    OP
       Oct 6, 2019
    @Zhengqing 小型大写..._(:з」∠)_
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