for_2012 2013-05-30 07:11 采纳率: 0%
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获取网页整个图片失败

需要捕获网页的全屏图片,但是显示出来是空白。

应该怎么实现?

我的失败代码:

CGSize overallSize = [WebPageImage sizeThatFits:CGSizeZero];
UIGraphicsBeginImageContext(WebPageImage.scrollView.contentSize);
WebPageImage.bounds = CGRectMake(0, 0, overallSize.width, overallSize.height);
while (WebPageImage.loading) {
    [NSThread sleepForTimeInterval:0.1];
}
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,(unsigned long)NULL), ^(void) {
    UIImageWriteToSavedPhotosAlbum(viewImage, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
});
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1条回答

  • xinyoulingxi1_tong 2013-05-30 09:28
    关注

    根据需求修改吧,这是可以捕捉整个屏幕的抓图

    - (UIImage *) imageFromWebView:(UIWebView *)view
    {
    //    tempframe to reset view size after image was created
        CGRect tmpFrame     = view.frame;
    
        // set new Frame
        CGRect aFrame       = view.frame;
        aFrame.size.height  = [view sizeThatFits:[[UIScreen mainScreen] bounds].size].height;
        aFrame.size.width   = [view sizeThatFits:[[UIScreen mainScreen] bounds].size].width;
        view.frame          = aFrame;
    
    //     do image magic
        UIGraphicsBeginImageContext([view sizeThatFits:[[UIScreen mainScreen] bounds].size]);
        CGContextRef resizedContext = UIGraphicsGetCurrentContext();
        [self.thmbWebView.layer renderInContext:resizedContext];
        UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();
    
        // reset Frame of view to origin
        view.frame = tmpFrame;
        return image;
    }
    
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