_tableView.estimatedRowHeight = 50;//预估行高
_tableView.rowHeight = UITableViewAutomaticDimension;//设置行高自动计算
cell里视图用Masonry做约束
[self.bgImgView mas_makeConstraints:^(MASConstraintMaker *make) {
make.top.left.equalTo(self.contentView).offset(10);
// 提高约束的优先级
make.size.mas_equalTo(CGSizeMake(100, 100)).priorityHigh();
}];
[self.conLabel mas_makeConstraints:^(MASConstraintMaker *make) {
make.top.equalTo(self.bgImgView.mas_bottom).offset(10);
make.left.equalTo(self.contentView).offset(10);
make.bottom.right.equalTo(self.contentView).offset(-10);
}];
