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アプリのスクリーンショットを取得する

Last updated at Posted at 2016-01-20

下のスニペットでメインスクリーンのスクリーンショットが撮影できる。
アプリが複数の UIWindow を保持していたり、複数の UIScreen にまたがってUIが表示されるとしても対応可能なはず。

    UIGraphicsBeginImageContext(_screenSize);
    UIScreen *mainScreen = [UIScreen mainScreen];
    for (UIWindow *windowItr in [UIApplication sharedApplication].windows) {
        if ([windowItr.screen isEqual:mainScreen]) {
            [windowItr drawViewHierarchyInRect:windowItr.frame afterScreenUpdates:YES];
        }
    }
    UIImage *screenshot = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
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