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自定义tableViewCell，并在.m 文件执行以下代码

- (void)layoutSubviews{
    [super layoutSubviews];
    for (UIView *subView in self.subviews) {
        if([subView isKindOfClass:NSClassFromString(@"UITableViewCellDeleteConfirmationView")]) {
            // 拿到subView之后再获取子控件
            UIView *deleteConfirmationView = subView.subviews[0];
            for (UIView *deleteView in deleteConfirmationView.subviews) {
                UIImageView *deleteImage = [[UIImageView alloc] init];
                deleteImage.contentMode = UIViewContentModeScaleAspectFit;
              //Delete为图片
                deleteImage.image = [UIImage imageNamed:@"Delete"];
                deleteImage.frame = CGRectMake(0, 0, deleteView.frame.size.width, deleteView.frame.size.height);
                [deleteView addSubview:deleteImage];
            }
        }
    }
}