UINavigationBar中的分段控件奇怪的截图iOS

Question

我在UINavigationBar 中有一个UISegmentedControl，看起来像这样：

在这里您可以看到它在 Storyboard 中的创建方式：

问题是，当我以编程方式创建屏幕截图时，为了分享它，我得到了 UISegmentedControl 没有所选标签的文本，如下所示：

据我所知，状态栏不出现是正常的，并且共享按钮显示为选中状态，因为实际上它是在截屏时选中的，但不知道发生了什么UISegmentedControl，有什么想法吗？

PS：我可以分享截图代码，但它是非常简单的标准代码。

更新

这是我正在使用的屏幕截图代码：

- (UIImage*)screenshot
{
    // Create a graphics context with the target size
    // On iOS 4 and later, use UIGraphicsBeginImageContextWithOptions to take the scale into consideration
    // On iOS prior to 4, fall back to use UIGraphicsBeginImageContext
    CGSize imageSize = [[UIScreen mainScreen] bounds].size;
    if (NULL != UIGraphicsBeginImageContextWithOptions)
        UIGraphicsBeginImageContextWithOptions(imageSize, NO, 0);
    else
        UIGraphicsBeginImageContext(imageSize);

    CGContextRef context = UIGraphicsGetCurrentContext();

    // Iterate over every window from back to front
    for (UIWindow *window in [[UIApplication sharedApplication] windows])
    {
        if (![window respondsToSelector:@selector(screen)] || [window screen] == [UIScreen mainScreen])
        {
            // -renderInContext: renders in the coordinate space of the layer,
            // so we must first apply the layer's geometry to the graphics context
            CGContextSaveGState(context);
            // Center the context around the window's anchor point
            CGContextTranslateCTM(context, [window center].x, [window center].y);
            // Apply the window's transform about the anchor point
            CGContextConcatCTM(context, [window transform]);
            // Offset by the portion of the bounds left of and above the anchor point
            CGContextTranslateCTM(context,
                                  -[window bounds].size.width * [[window layer] anchorPoint].x,
                                  -[window bounds].size.height * [[window layer] anchorPoint].y);

            // Render the layer hierarchy to the current context
            [[window layer] renderInContext:context];

            // Restore the context
            CGContextRestoreGState(context);
        }
    }

    // Retrieve the screenshot image
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return image;
}

更新 2

这里是一个重现错误的简单项目：https://github.com/apascual/APSegmentedControlExample

Answer 1

您使用的是 iOS 7 吗？如果是这样，您是否使用新的 screenShot api？如果是这样，您是否将 afterScreenUpdates 设置为 YES？

- (UIImage *) getScreenShotForView:(UIView *)view {
    UIGraphicsBeginImageContext(view.bounds.size);

    // I think this is what was used pre iOS 7.x
    //[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];

    // iOS 7.x -->
    [view drawViewHierarchyInRect:view.bounds afterScreenUpdates:YES]; // Set To YES
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return image;
}

更新

根据@LeoNatan 的评论，你可以使用你的窗口

- (UIImage *) getScreenShotForView:(UIView *)view {
    UIGraphicsBeginImageContext(view.bounds.size);

    // iOS 7.x -->
    [[[[UIApplication sharedApplication] windows] objectAtIndex:0] drawViewHierarchyInRect:view.bounds afterScreenUpdates:YES]; // Set To YES
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return image;
}

Answer 2

最后更新：你只需要更换

[[window layer] renderInContext:context];

到

[self.view drawViewHierarchyInRect:self.view.bounds afterScreenUpdates:YES]; // also tried with "inRact:window.bounds";

注意 - drawViewHierarchyInRect:afterScreenUpdates: 仅适用于iOS 7。

更多信息，你也可以使用截图..

UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, YES, [[UIScreen mainScreen] scale]);
[self.view drawViewHierarchyInRect:self.view.bounds afterScreenUpdates:YES];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();