swift UIAlertController使用 UIAlertController的宽度 为270

     
添加子控件  
1. 有标题， alert标题高度大概 是 40， 子控件的 Y一般在40 ，如果中间有换行， 
 的高度大概是30 
2.alert的宽度 是270， 设置frame 的时候注意



   /// 


 多打几行 可以添加 空间高度
        let alert = UIAlertController(title: "预约
信息


", message: "", preferredStyle: UIAlertControllerStyle.alert)
        
        /// 添加输入框
        let textView = UITextView()
        textView.text = self.dataArr[row].remark
        textView.textColor = UIColor.black
        textView.backgroundColor = UIColor.red
        //        textView.delegate = self
        textView.frame = CGRect(x: 10, y: 40 + 30,  250 , height: 90)
        alert.view.addSubview(textView)
        
        //添加确定按钮
        alert.addAction(UIAlertAction.init(title: "确定", style: UIAlertActionStyle.default, handler: { (_) in
            DDLOG(message: "点了确定 = (textView.text)")
        }))
        
        //添加取消按钮
        alert.addAction(UIAlertAction.init(title: "取消", style: UIAlertActionStyle.cancel, handler: { (_) in
            DDLOG(message: "点了取消")
        }))

        self.present(alert, animated: true) {
            DDLOG(message: "添加完成")
        }

　　

2. 自定义文字大小颜色等

 private func showTipAlert(tipStr:String,
                              leftStr:String,
                              leftColor:UIColor,
                              leftBlock:(()->())?,
                              rightStr:String,
                              rightColor:UIColor,
                              rightBlock:(()->())?){
        let alert = UIAlertController(title: nil, message: nil, preferredStyle: UIAlertController.Style.alert)
        
        //修改title
        let alertTitle = NSMutableAttributedString(string: tipStr, attributes: [NSAttributedString.Key.foregroundColor :  UIColor.init(hexString: "#424242") ,NSAttributedString.Key.font: UIFont.systemFont(ofSize: 14)])
       
        alert.setValue(alertTitle, forKey: "attributedTitle")
        
        /// 左边的按钮
        let leftAction = UIAlertAction(title: leftStr, style: UIAlertAction.Style.default) { (_) in
            leftBlock?()
        }
        leftAction.setValue(leftColor, forKey: "titleTextColor")
        alert.addAction(leftAction)
        
        /// 右边的按钮
        let rightAction = UIAlertAction(title: rightStr, style: UIAlertAction.Style.default, handler: { (_) in
            rightBlock?()
        })
        rightAction.setValue(rightColor, forKey: "titleTextColor")
        alert.addAction(rightAction)
        self.present(alert, animated: true, completion: nil)
    }

添加 自定义view参考 

Swift - 自定义UIAlertController的样式2（添加自定义视图）：https://www.hangge.com/blog/cache/detail_1657.html