给TableView添加动画及cell的自适应高度

弹出效果：

//给cell添加动画
-(void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
{
    //设置Cell的动画效果为3D效果
    //设置x和y的初始值为0.1；
    cell.layer.transform = CATransform3DMakeScale(0.1, 0.1, 1);
    //x和y的最终值为1
    [UIView animateWithDuration:1 animations:^{
        cell.layer.transform = CATransform3DMakeScale(1, 1, 1);
    }];
}

翻转效果：

 // 从锚点位置出发，逆时针绕 Y 和 Z 坐标轴旋转90度
    CATransform3D transform3D = CATransform3DMakeRotation(M_PI_2, 0.0, 1.0, 1.0);
    
    // 定义 cell 的初始状态
    cell.alpha = 0.0;
    cell.layer.transform = transform3D;
    cell.layer.anchorPoint = CGPointMake(0.0, 0.5); // 设置锚点位置；默认为中心点(0.5, 0.5)
    
    // 定义 cell 的最终状态，执行动画效果
    // 方式一：普通操作设置动画
    [UIView beginAnimations:@"transform" context:NULL];
    [UIView setAnimationDuration:0.5];
    cell.alpha = 1.0;
    cell.layer.transform = CATransform3DIdentity;
    CGRect rect = cell.frame;
    rect.origin.x = 0.0;
    cell.frame = rect;
    [UIView commitAnimations];

---

1.写一个获取lable高度的方法

-(NSAttributedString *)attributedBodyTextAtIndexPath:(NSIndexPath *)indexPath

{
    
    NSString *text = muarr[indexPath.row];
    
    UIFont *font = [UIFont systemFontOfSize:17];
    
    NSDictionary *testDic = [NSDictionary dictionaryWithObject:font forKey:NSFontAttributeName];
    
    NSAttributedString *string = [[NSAttributedString alloc]initWithString:text attributes:testDic];
    
    return string;
    
}

2.设置cell 高度

-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
    // －20    左右距两边各为10;
    CGFloat labelWidth = self.tableview.bounds.size.width - 20;
    
    NSAttributedString *test = [self attributedBodyTextAtIndexPath:indexPath];
    
    NSStringDrawingOptions options = NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading;
    
    CGRect rect = [test boundingRectWithSize:CGSizeMake(labelWidth, 0) options:options context:nil];
    
    return (CGFloat)(ceil(rect.size.height) + 20);
    
}