tableview单元格的方法未在iOS 13和xcode 11中返回完美的单元格大小

Question

实际上，我有一个要在tableview单元格内的视图上应用阴影。该视图的高度是动态的（基于内容），这意味着tableview单元格是其自身大小的单元格。在iOS 13和xcode 11之前，我的代码可以完美运行，因为tableview单元的“ setSelected”方法返回单元的所有子视图的完美大小。在iOS 13和xcode 11中，所有子视图的tableview单元格的“ setSelected”方法返回的大小与xib中的设置相同。

使用下面的代码在视图上应用阴影：-

// Below method return correct size of view_margin (UIView) after content update in xcode 12 , but in xcode 13 below method return view_margin size same as size define in xib means not update size based on content 
// Below method is tableview cell method
- (void)setSelected:(BOOL)selected animated:(BOOL)animated 
{
    UIBezierPath *shadowPath = [UIBezierPath bezierPathWithRect:self.view_margin.bounds];
    self.view_margin.layer.shadowColor = [UIColor blackColor].CGColor;
    self.view_margin.layer.shadowOffset = CGSizeMake(0.0, 2.0);
    self.view_margin.layer.shadowOpacity = 0.2;
    self.view_margin.layer.shadowPath = shadowPath.CGPath;
    self.view_margin.layer.masksToBounds = NO;
}

仅在xcode 11和iOS 13中会出现此问题

Answer 1

尝试一下：

- (void)setSelected:(BOOL)selected animated:(BOOL)animated 
{

    dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.1 * NSEC_PER_SEC));
    dispatch_after(popTime, dispatch_get_main_queue(), ^(void){

            UIBezierPath *shadowPath = [UIBezierPath bezierPathWithRect:self.view_margin.bounds];
            self.view_margin.layer.shadowColor = [UIColor blackColor].CGColor;
            self.view_margin.layer.shadowOffset = CGSizeMake(0.0, 2.0);
            self.view_margin.layer.shadowOpacity = 0.2;
            self.view_margin.layer.shadowPath = shadowPath.CGPath;
            self.view_margin.layer.masksToBounds = NO;

    });

}