renderInContext对App Memory征税 [英] renderInContext taxes App Memory

问题描述

我正在2448 X 2448像素图片上运行此代码。 fullScaleView 也是2448 X 2448（ fullScreenView Rect：{{0,0}，{2448,2448}} ） 。方法完成后，App内存从49.7MB跳至240MB，降至172MB。它保持在172MB。在这个 renderInContext 之后，应用程序似乎仍然无法在如此高的内存占用率下运行。我应该在何处以及如何强制释放？ （iOS 7 XCode 5 ARC）。

I'm running this code on a 2448 X 2448 pixel Image. fullScaleView is also 2448 X 2448 (fullScreenView Rect:{{0, 0}, {2448, 2448}}). The App memory jumps from 49.7MB to 240MB down to 172MB after the method is complete. It stays at 172MB. It doesn't seem like the app should still be running at such high a memory footprint after this one renderInContext. Where and how should I force a release? (iOS 7 XCode 5 ARC).

UIGraphicsBeginImageContextWithOptions(fullScaleView.bounds.size, fullScaleView.opaque, 1.0);
[fullScaleView.layer renderInContext: UIGraphicsGetCurrentContext()];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

推荐答案

内存跳跃，因为图像很大 - 如果你确定你不再需要它了，你应该在自动释放块中使用返回的图像进行包装：

The memory jumps because the image is huge - if you are sure that you won't need it anymore, you should wrap wherever you are using the returned image in an autorelease block:

例如

@autoreleasepool {
    UIImage *theReturnedImage = yourmethodthatreturnstherenderedimage();
    // do stuff with your image
}

不幸的是，直到你是完成使用图像，它将占用空间，所以你只需要快速释放它。

Unfortunately, until you are finished using the image, it will take up space, so you just have to release it quickly.

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