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konachan-ios's Issues

Offline mode 快速滑動會引起 crash

設置:

  • Preview Image Type: Predownload pictures
  • Download Image Type: Sample
  • Preload next page image: On
  • Offline mode: On

上下來回滑動速度很快的時候 100% 引起 crash。

大概原因能猜到是因爲內存佔用過高。


解決方法是:

給 SDWebImage 設定最大內存緩存佔用數值

// 在 viewDidLoad: 里
[[SDImageCache sharedImageCache] setMaxMemoryCost:[self deviceMaxMemoryCost]];

- (NSInteger)deviceMaxMemoryCost {
    unsigned long long physicalMemory = [NSProcessInfo processInfo].physicalMemory;
    NSInteger allowedMaxMemory = physicalMemory*0.5/4;
    return allowedMaxMemory;
}

由於 SDWebImage 使用 NSCache 作爲緩存,而 NSCache 佔用的內存並不會在 Xcode Debug Seesion Tab 的 Memory Usage 里顯示出來,需要使用在 Instruments 里才能看到是 CG raster data 在佔用大量的內存,設定好上面的值讓它在 iOS 系統單個 app 的最大 limit 值內之後,解決。上面設置爲設備最大內存的一半

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