给tableView 截个图 只要cell的截图

self.tableView.userInteractionEnabled =NO;//暂时禁用交互，让tableView自己滑动

//
生成保存的单个图片先存入array

NSMutableArray * imageArr = [NSMutableArrayarray];

//
将tableView滚动至第一个cell的位置，确保第一组cell全部可见

[self.tableViewsetContentOffset:CGPointMake(0,150)
animated:NO];

for (NSInteger i =0; i <
6; i++) {

NSIndexPath * indexPath = [NSIndexPathindexPathForRow:i
inSection:0];

//
将cell一个一个渲染成图片

LJFallDownSectionOneCell * cell = [self.tableViewcellForRowAtIndexPath:indexPath];

UIGraphicsBeginImageContext(cell.frame.size);

[cell.layerrenderInContext:UIGraphicsGetCurrentContext()];

UIImage * image =UIGraphicsGetImageFromCurrentImageContext();

if (image) {

[imageArr addObject:image];

}

UIGraphicsEndImageContext();

LJLog(@"aaa%ld",imageArr.count);

}

// 第二组全部可见后开始渲染

[UIViewanimateWithDuration:3.0animations:^{

[self.tableViewscrollToRowAtIndexPath:[NSIndexPathindexPathForRow:0inSection:1]atScrollPosition:UITableViewScrollPositionTopanimated:NO];//
animated 必须为NO，否则和UIView
animateWithDuration冲突

} completion:^(BOOL finished) {//动画完成后开始渲染

if (finished) {

for (NSInteger j =0; j <
10; j ++) {

NSIndexPath * indexPath = [NSIndexPathindexPathForRow:j
inSection:1] ;

LJFallDownSectionOneCell * cell = [self.tableViewcellForRowAtIndexPath:indexPath];

UIGraphicsBeginImageContext(cell.frame.size);

[cell.layerrenderInContext:UIGraphicsGetCurrentContext()];

UIImage * image =UIGraphicsGetImageFromCurrentImageContext();

if (image) {

[imageArr addObject:image];

}

UIGraphicsEndImageContext();

LJLog(@"bbb%ld",imageArr.count);

}

// start

//将所有小图片拼成一张大图片

// 先计算出大图片的大小

CGFloat totalH =
0;

for (UIImage * imagein imageArr) {

totalH += image.size.height;

}

UIGraphicsBeginImageContext(CGSizeMake(LFScreenWidth, totalH));

CGFloat hight =
0;

for (NSInteger i =0; i < imageArr.count; i ++) {

UIImage * image = imageArr[i];

[image drawInRect:CGRectMake(0, hight,LFScreenWidth, image.size.height)];

hight += image.size.height;

}

UIImage * bigImage =UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

/// 存入沙盒

NSData * imageData =
UIImagePNGRepresentation(bigImage);

NSString * filePath =NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask,
YES)[0];

NSString * imagePath = [filePathstringByAppendingString:@"/history.png"];

BOOL flag= [imageData
writeToFile:imagePath atomically:YES];

if (flag) {

LJLog(@"存入图片成功");

}else{

LJLog(@"存入图片失败");

}

[MBProgressHUD
showSuccess:@"保存成功"toView:self.view];

// end

}

}];

self.tableView.userInteractionEnabled =YES;