IOS 根据屏幕高度设置tableview中图片元素的大小

尝试该方法无法实现：

cell.bankbgImageView.contentMode = UIViewContentModeCenter;   
cell.bankbgImageView.frame = CGRectMake(0, 0, 50, 50); 

直接在tableview中修改cell 元素的大小是无法实现的，只有通过下面的做法调整：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *cellid = @"BankCradCell";
    BankCradCell * cell = [tableView dequeueReusableCellWithIdentifier:cellid];

    if (!cell) {
        cell = [[[NSBundle mainBundle] loadNibNamed:@"BankCradCell" owner:self options:nil]firstObject];
    }
    //imagview 赋值
    cell.bankbgImageView.image = [UIImage imageNamed:@"bank_ny"];
    //根据屏幕高度调整图片大小
   CGFloat cellHeight = 100*__kRatio;
    //调整大小
    CGSize itemSize = CGSizeMake(cellHeight*3.25, cellHeight);
    UIGraphicsBeginImageContextWithOptions(itemSize, NO, UIScreen.mainScreen.scale);
    CGRect imageRect = CGRectMake(0.0, 0.0, itemSize.width, itemSize.height);
    [cell.bankbgImageView.image drawInRect:imageRect];
    cell.bankbgImageView.image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return cell；
    }

赶紧试试吧!