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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