I need to capture a UIView and all it's subviews into a UIImage. The problem is that part of the view is o开发者_如何学运维ff screen, so I can't use the screen capture function, and when I try to use the UIGraphicsGetImageFromCurrentImageContext() function, it doesn't seem to capture the subviews as well. Should it be capturing the subviews and I'm just doing something wrong? If not, is there any other way of accomplishing this?

That's the right way to go:

+ (UIImage *) imageWithView:(UIView *)view
{
    UIGraphicsBeginImageContextWithOptions(view.bounds.size, view.opaque, [[UIScreen mainScreen] scale]); 
    [view.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage * img = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return img;
}

This method is an extension method for UIImage class, and it will also take care of making the image looks good on any future high-resolution devices.

Do you mean

UIGraphicsBeginImageContext(view.bounds.size);
[view.layer drawInContext:UIGraphicsGetCurrentContext()];
UIImage * img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

doesn't work? I'm pretty sure it ought to...

Swift 4+ Version:

func getImage(from view:UIView) -> UIImage? {

    defer { UIGraphicsEndImageContext() }
    UIGraphicsBeginImageContextWithOptions(view.frame.size, true, UIScreen.main.scale)
    guard let context =  UIGraphicsGetCurrentContext() else { return nil }
    view.layer.render(in: context)
    return UIGraphicsGetImageFromCurrentImageContext()   

}

Here's a Swift 2.x version that should work if you first create an array of the UIViews to get flattened:

// Flattens <allViews> into single UIImage
func flattenViews(allViews: [UIView]) -> UIImage? {
    // Return nil if <allViews> empty
    if (allViews.isEmpty) {
        return nil
    }

    // If here, compose image out of views in <allViews>
    // Create graphics context
    UIGraphicsBeginImageContextWithOptions(UIScreen.mainScreen().bounds.size, false, UIScreen.mainScreen().scale)
    let context = UIGraphicsGetCurrentContext()
    CGContextSetInterpolationQuality(context, CGInterpolationQuality.High)

    // Draw each view into context
    for curView in allViews {
        curView.drawViewHierarchyInRect(curView.frame, afterScreenUpdates: false)
    }

    // Extract image & end context
    let image = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()

    // Return image
    return image
}