Find UIWebView height dynamically when inside UITableViewCell

I have a custom UITableViewCell like this

// CustomQuestionCell.h
@interface CustomQuestionCell : UITableViewCell {

    IBOutlet UIWebView *mywebView;

}

-(void) AssignWebView:(NSString *) _text;

// CustomQuestionCell.m
-(void) AssignWebView:(NSString *) _text {

     [mywebView setDelegate:self];
    [mywebView loadHTMLString:_text baseURL:nil];

}

I can successfully use the UITableViewCell in UITableView in file called MainViewController. The delagate of UITableViewCell is CustomQuestionCell. In MainViewController I am calling below code to assign value to UIwebview.

// cellForRowAtIndexPath
//CustomQuestionCel.xib uses the class CustomQuestionCell defined above.

CustomQuestionCell *cell = (CustomQuestionCell *)[tableView dequeueReusableCellWithIdentifier:MyIdentifier];

if(cell == nil) {

    [[NSBundle mainBundle] loadNibNamed:@"CustomQuestionCellView" owner:self options:nil];
    cell = tblQuestionCell;
}

[cell AssignWebView:[ListOfQuestions objectAtIndex:indexPath.row]];



return cell;

I also have the following delegate code in CustomQuestionCell.m

- (void)webViewDidFinishLoad:(UIWebView *)aWebView {
    CGRect frame = aWebView.frame;
    frame.size.height = 1;
    aWebView.frame = 开发者_JAVA百科frame;
    CGSize fittingSize = [aWebView sizeThatFits:CGSizeZero];
    frame.size = fittingSize;
    aWebView.frame = frame;

    NSLog(@"webview frame size %f",aWebView.frame.size.height);
    [aWebView setOpaque:NO];
    [aWebView setBackgroundColor:[UIColor colorWithRed:249.0/255 green:243.0/255 blue:236.0/255 alpha:1.0]];

    [activityLoad stopAnimating];
    [mywebView setHidden:NO];
}

My problem is I am not able to set the the height of the cell properly in MainViewController which has tableView which uses the custom cell "CustomQuestionCell". In the function

 - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath

in MainViewController how can I set the height of the cell as aWebView.frame.size.height ????

---

The best way (I think) is create a delegate.

1. CustomQuestionCell.h

@protocol CustomQuestionCellDelegate;

@interface CustomQuestionCell : UITableViewCell {
    IBOutlet UIWebView *mywebView;
    id <CustomQuestionCellDelegate> *delegate;
}

- (void)checkHeight;

@property (nonatomic, assign) id <CustomQuestionCellDelegate> *delegate;

@end

@protocol CustomQuestionCellDelegate <NSObject>

@optional
- (void)customQuestionCell:(CustomQuestionCell *)cell shouldAssignHeight:(CGFloat)newHeight;

@end

2. CustomQuestionCell.m (webViewDidFinishLoad:)

- (void)webViewDidFinishLoad:(UIWebView *)aWebView {
    CGRect frame = aWebView.frame;
    frame.size.height = 1;
    aWebView.frame = frame;
    CGSize fittingSize = [aWebView sizeThatFits:CGSizeZero];
    frame.size = fittingSize;
    aWebView.frame = frame;

    NSLog(@"webview frame size %f",aWebView.frame.size.height);
    [aWebView setOpaque:NO];
    [aWebView setBackgroundColor:[UIColor colorWithRed:249.0/255 green:243.0/255 blue:236.0/255 alpha:1.0]];

    [activityLoad stopAnimating];
    [mywebView setHidden:NO];
}

- (void)checkHeight {
    if([self.delegate respondsToSelector:@selector(customQuestionCell:shouldAssignHeight:)]) {
        [self.delegate customQuestionCell:self shouldAssignHeight:aWebView.frame.size.height];
    }
}

3. MainViewController.m (tableView:cellForRowAtIndexPath:)

CustomQuestionCell *cell = (CustomQuestionCell *)[tableView dequeueReusableCellWithIdentifier:MyIdentifier];

if(cell == nil) {

    [[NSBundle mainBundle] loadNibNamed:@"CustomQuestionCellView" owner:self options:nil];
    cell = tblQuestionCell;
}

cell.delegate = self; // <-- add this

[cell AssignWebView:[ListOfQuestions objectAtIndex:indexPath.row]];

if([[didReloadRowsBools objectForKey:[NSString stringWithFormat:@"%d",indexPath.row]] boolValue] != YES) {
    [cell checkHeight];
}

return cell;

4. MainViewController.m (add theese methods wherever you want)

- (void)customQuestionCell:(CustomQuestionCell *)cell shouldAssignHeight:(CGFloat)newHeight {
    NSIndexPath *indexPath = [tableView indexPathForCell:cell];
    [cellHeights setObject:newHeight forKey:[NSString stringWithFormat:@"%d",indexPath.row]];
    [didReloadRowsBools setObject:[NSNumber numberWithBool:YES] forKey:[NSString stringWithFormat:@"%d",indexPath.row]];
    [tableView beginUpdates];
    [tableView reloadRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
    [tableView endUpdates];
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
    NSString *key = [NSString stringWithFormat:@"%d",indexPath.row];
    if([cellHeights objectForKey:key] == nil) {
        return 44; // change it to your default height
    } else {
        return [cellHeights objectForKey:key];
    }
}

5. MainViewController.h

#import "CustomQuestionCell.h"

@interface MainViewController : UIViewController <CustomQuestionCellDelegate> {

    NSMutableDictionary *cellHeights; // <-- add this
    NSMutableDictionary *didReloadRowsBools; <-- and this

}

@end

---

I have not actually tried this, but I would have an NSMutableArray of float values for the heights. In webViewDidFinishLoad, assign to the array at the proper index with aWebView.frame.size.height, then reload that cell.

heightForRowAtIndexPath can then simply point to the the height array at index indexPath.row.