最近要做‘截长图分享’，需要将view上显示的所有内容转换成image。查找资料做了，但是获取的图片只显示一部分，下面是代码，大神给看看：

-（UIImage*)getLongShotsImageView:(UIScrollView*)scrollview { NSMutableArray *imgArray = [[[NSMutableArray alloc]initWithCapacity:0] autorelease]; NSInteger total = ceilf(scrollview.contentSize.height/scrollview.frame.size.height); CGSize size = CGSizeZero; for (NSInteger i = 0; i < total; ++i) { [scrollview setContentOffset:CGPointMake(0, i*scrollview.frame.size.height)] ; if (i == total-1) { size = CGSizeMake(self.view.frame.size.width, scrollview.contentSize.height- i*scrollview.frame.size.height); } else { size = scrollview.frame.size; } UIGraphicsBeginImageContextWithOptions(size, NO, [UIScreen mainScreen].scale); CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSaveGState(context); CGContextTranslateCTM(context, -scrollview.frame.origin.x, -scrollview.frame.origin.y); [scrollview.layer renderInContext:context]; CGContextRestoreGState(context); UIImage *img = UIGraphicsGetImageFromCurrentImageContext(); [imgArray addObject:img]; UIGraphicsEndImageContext(); } // 拼接 UIImage *image = imgArray[0]; if (imgArray.count == 1) { return image; } for (NSInteger i = 1; i < imgArray.count; i++) { image = [self combineWithTopImage:image BottomImage:imgArray[i] ImageSacle:[UIScreen mainScreen].scale]; if (i == imgArray.count-1) { break; } } return image; }

- (UIImage *)combineWithTopImage:(UIImage*)image1 BottomImage:(UIImage*)image2 ImageSacle:(CGFloat)imageSacle { CGFloat w = image1.size.width; CGFloat h = image1.size.height + image2.size.height; CGSize offSize = CGSizeMake(w, h); UIGraphicsBeginImageContextWithOptions(offSize, NO, imageSacle); CGRect rect1 = CGRectMake(0, 0, w, image1.size.height); [image1 drawInRect:rect1]; CGRect rect2 = CGRectMake(0, rect1.origin.y+image1.size.height, w, image2.size.height); [image2 drawInRect:rect2]; UIImage *img = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return img; }

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