如何使用动画UIImageView捕获iPhone屏幕?

问题描述

我有一个UIImageView放置在视图上，我想在该UIImageView动画时捕获iPhone屏幕.

I have a UIImageView placed over a view and I want to capture iPhone screen while that UIImageView is animating.

我可以成功捕获UIImageView的静止帧的屏幕截图，如下所示:

I can successfully capture the screen shots of the still frames of the UIImageView like this:

[[myView layer] renderInContext:context];

但是，当UIImageView设置动画动画时

However when the UIImageView is animating throguh

[MyImageView startAnimating]

然后，没有捕获那些动画帧.

then, those animating frames are not captured.

renderInContext是否有可用的替代方法同时捕获动画帧?

Is there any alternative to renderInContext available at the moment that can capture the animating frames as well?

注意:我知道iOS4更新后Apple不再接受UIGetScreenImage().

NOTE: I know UIGetScreenImage() is no longer accepted by Apple after iOS4 update.

推荐答案

CALayers在动画制作时使用presentationLayer表示图层的当前状态. CALayer 的 -presentationLayer 方法将为您返回表示层.因此，您可能想尝试 [[[[myView layer] presentationLayer] renderInContext:context]; 来捕获其内容.

CALayers use a presentationLayer to represent the current state of the layer while animating. CALayer's -presentationLayer method returns you the presentation layer. So you might want to try [[[myView layer] presentationLayer] renderInContext:context]; to capture its contents.

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