映射，筛选，连接，猜数器

1.map :映射 （类型转换，如转换成字符串，作用在数组等集合上）
filter：筛选 （作用在数组等集合上）
reduce：连接 （不是一个数组了，只有一个值了）
0 是初始值，不是第一个元素，如sum，就是从0开始加起 。
连写的时候要注意！！！---->（），有时可能就是忘了（）。
字符串打印出来和数字看上去一样，都是数字。
2.convert(转换)
只建立一个带主函数的工程：OS X --->Application --->Command Line Tool
font:字体
bord：边界
nav.divenedu.com png/jpg bm

3.unwrapping : 打开，展开，
unwarpping an optional value 打开一个可选的值，意思是要定义为变量
一般就是label前的let 应该去掉。

4. var label : UILabel!
   var textField:UITextField!
   var result = arc4random_uniform(100)
   //

   override func viewDidLoad() {
   super.viewDidLoad()

    label = UILabel()
    label.frame = CGRect(x: 80, y: 80, width: 100, height: 40)
    label.text = "猜一猜"
    label.backgroundColor = UIColor.redColor()
    label.textColor = UIColor.greenColor()
    label.font = UIFont.systemFontOfSize(28)
    label.textAlignment = .Center
    self.view.addSubview(label)
   

   let label1 = UILabel()
   label1.frame = CGRect(x: 50, y: 150, width: 40, height: 40)
   label1.text = "0"
   label1.backgroundColor = UIColor.redColor()
   label1.textColor = UIColor.greenColor()
   label1.font = UIFont.systemFontOfSize(28)
   label1.textAlignment = .Center
   self.view.addSubview(label1)

   let label2 = UILabel()
   label2.frame = CGRect(x: 100, y: 150, width: 40, height: 40)
   label2.text = "到"
   label2.backgroundColor = UIColor.redColor()
   label2.textColor = UIColor.greenColor()
   label2.font = UIFont.systemFontOfSize(28)
   label2.textAlignment = .Center
   self.view.addSubview(label2)

   let label3 = UILabel()
   label3.frame = CGRect(x: 150, y: 150, width: 60, height: 40)
   label3.text = "100"
   label3.backgroundColor = UIColor.redColor()
   label3.textColor = UIColor.greenColor()
   label3.font = UIFont.systemFontOfSize(28)
   label3.textAlignment = .Center
   self.view.addSubview(label3)

    textField = UITextField()
    
    textField.frame = CGRect(x: 100, y: 200, width: 100, height: 40)
    textField.textColor = UIColor.blueColor()
    textField.borderStyle = .RoundedRect
    textField.placeholder = "请输入数字"
    textField.keyboardType = .NumberPad
    self.view.addSubview(textField)
    
    let btn = UIButton(type: .System)
// btn.setTitle("确定", forState: .Normal)

// btn.setTitle("高亮", forState: .Highlighted)
// btn.setTitle("选用", forState: .Selected)
// btn.setTitle("禁用", forState: .Disabled)
//

   let image = UIImage(named: "check")
    btn.setBackgroundImage(image, forState: .Normal)
    btn.frame = CGRect(x: 100, y: 300, width: 100, height: 100)
    btn.addTarget(self, action: #selector(didClick), forControlEvents:.TouchUpInside)
    
    
    self.view.addSubview(btn)
    
    
    
    
    
    // Do any additional setup after loading the view, typically from a nib.
}
func didClick(){
    
    let number = UInt32(textField.text!)

// //number自己输入的数字，result为系统生成的数字

    if result == number {
        label.text = "猜对了"
        result = arc4random_uniform(100)
    }else if result < number {
        label.text = "猜大了"
    }else{
        label.text = "猜小了"
    }

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

}