MBLTDev15: Alexander Orlov, Postforpost
Transcript of MBLTDev15: Alexander Orlov, Postforpost
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Оптимизация UITableView
Александр Орловведущий iOS разработчик
Postforpost
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60 FPS
16 ms render cycle
~ 10 ms client code
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“It just works” ***
***lie
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Стандартные механизмы
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Переиспользование ячеек
• Не создаём экземпляры ячеек сами
• cellForRowAtIndexPath быстрее света
• Привязываем данные вовремя
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Расчёт высоты
• Не используем делегат для постоянной высоты
• Нельзя инициализировать экземпляр ячейки
• Autolayout - слоупок
• Всё очень плохо
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Расчёт высоты
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Расчёт высоты
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Расчёт высоты
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Расчёт высоты
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Расчёт высоты
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Расчёт высоты
Autolayout == Cassowary
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Расчёт высоты
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Расчёт высоты
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Расчёт высоты
“Scroll Performance: All layout is performed on a background thread, ensuring the main thread isn't tied up measuring text. 60FPS is a breeze even for deep, complex layouts like Facebook's News Feed.”
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“0x5f3759df”
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Нам нужно идти глубже
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Blending
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Blending
iOS Simulator “Debug” “Color Blended Layers”
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Blending
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Blending
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Blending
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“326 pixels per inch”
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Охота на пиксели
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Subpixel rendering
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Subpixel rendering
iOS Simulator “Debug” “Color Misaligned Images”
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Subpixel rendering
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Subpixel rendering
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Subpixel rendering
• Знать предельную точность координат/размеров
• Готовим ресурсы pixel-perfect
• Контролируем ситуацию
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“My tastes are very…singular”
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Асинхронный UI¯\_(ツ)_/¯
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Асинхронный UI
• Тяжелые операции в фон, показываем placeholder
• Instruments - друг наш
• Всё очень плохо
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Асинхронный UI
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Асинхронный UI
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Асинхронный UI
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Асинхронный UI
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Асинхронный UI
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Асинхронный UI
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Асинхронный UI
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Асинхронный UI
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Асинхронный UI
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Асинхронный UI
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0x5f3759df
medium.com/@plasm