捕获/渲染Scrollview的屏幕外内容

Question

我想将我的scrollview的屏幕外内容渲染为图像.

但是下面的代码只在屏幕上呈现内容,即使它应该呈现整个scrollView内容.

有人可以提供帮助吗？

提前致谢!

UIImage *image = nil;

 UIGraphicsBeginImageContextWithOptions(scrollView.contentSize, false, 0.0);
 {
        CGPoint savedContentOffset = scrollView.contentOffset;
        CGRect savedFrame = scrollView.frame;

        scrollView.contentOffset = CGPointMake(0.0, 0.0);
        scrollView.frame = CGRectMake(0, 0.0, scrollView.contentSize.width, scrollView.contentSize.height);

        NSLog(@"%.2f",scrollView.contentSize.height);

        [scrollView.layer renderInContext:UIGraphicsGetCurrentContext()];
        image = UIGraphicsGetImageFromCurrentImageContext();

        scrollView.contentOffset = savedContentOffset;
        scrollView.frame = savedFrame;

}
UIGraphicsEndImageContext();

Answer 1

事实证明我的自动调整设置不正确,因此滚动视图的下半部分没有移动......

以下代码效果很好:

码:

- (UIImage *)createPicture
{
[self setMasks:true];
UIImage *image = nil;

UIGraphicsBeginImageContextWithOptions(scrollView.contentSize, false, 0.0);
{
    CGPoint savedContentOffset = scrollView.contentOffset;
    CGRect savedFrame = scrollView.frame;

    scrollView.contentOffset = CGPointMake(0.0, 0.0);
    scrollView.frame = CGRectMake(0, 0.0, scrollView.contentSize.width, scrollView.contentSize.height);

    NSLog(@"%.2f",scrollView.contentSize.height);

    [scrollView.layer renderInContext:UIGraphicsGetCurrentContext()];
    image = UIGraphicsGetImageFromCurrentImageContext();

    scrollView.contentOffset = savedContentOffset;
    scrollView.frame = savedFrame;

}
UIGraphicsEndImageContext();

[self setMasks:false];

return image;
}

- (void)setMasks:(bool)photo
{
if (photo) {
    for (label in labels)
    {
        label.autoresizingMask = (UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleBottomMargin);
    }