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。
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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.
}
}
