Render CoreText use GCD
Demo中为了方便测试,写了NormalLabel和GCDLabel用于对比,对比性能时切换注释即可.
Demo中视图比较简单,只有一个Label,肉眼可能无法区分是否卡顿,可以通过使用Instruments来检测UITableview滑动的FPS. 复杂结构下FPS性能提升显著.
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