最近要做‘截長圖分享’，需要將view上顯示的所有內容轉換成image。查找資料做了，但是獲取的圖片只顯示一部分，下面是代碼，大神給看看：

-（UIImage*)getLongShotsImageView:(UIScrollView*)scrollview{ NSMutableArray *imgArray = [[[NSMutableArray alloc]init<愛尬聊_尬聊生活>WithCapacity: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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