第八天的作业练习

作业一（创建三个滑竿来改变视图的背景色）

import UIKit

class ViewController: UIViewController {
//定义为全局变量
    var sliderRed:UISlider! = nil
    var sliderGreen:UISlider! = nil
    var sliderBlue:UISlider! = nil
    override func viewDidLoad() {
        super.viewDidLoad()
       sliderRed = UISlider(frame: CGRect(x: 50, y: 100, width: 200, height: 30))
        sliderRed.maximumValue = 255
        sliderRed.minimumValue = 0
        sliderRed.thumbTintColor = #colorLiteral(red: 0.9254902005, green: 0.2352941185, blue: 0.1019607857, alpha: 1)
        self.view.addSubview(sliderRed)
        sliderRed.addTarget(self, action: #selector(sliderAction), for: .valueChanged)
        sliderGreen = UISlider(frame: CGRect(x: 50, y: 150, width: 200, height: 30))
        sliderGreen.addTarget(self, action: #selector(sliderAction), for: .valueChanged)
        sliderGreen.maximumValue = 255
        sliderGreen.minimumValue = 0
        sliderGreen.thumbTintColor = #colorLiteral(red: 0.3411764801, green: 0.6235294342, blue: 0.1686274558, alpha: 1)
        self.view.addSubview(sliderGreen)
       sliderBlue = UISlider(frame: CGRect(x: 50, y: 200, width: 200, height: 30))
        sliderBlue.addTarget(self, action: #selector(sliderAction), for: .valueChanged)
        sliderBlue.thumbTintColor = #colorLiteral(red: 0.2392156869, green: 0.6745098233, blue: 0.9686274529, alpha: 1)
        sliderBlue.maximumValue = 255
        sliderBlue.minimumValue = 0
        self.view.addSubview(sliderBlue)
        
    }
    func sliderAction(slider:UISlider){
       let color = UIColor(colorLiteralRed: sliderRed.value/255, green: sliderGreen.value/255, blue: sliderBlue.value/255, alpha: 1.0)
        self.view.backgroundColor = color
    }

}

**运行结果如下图所示，滑动滑竿可以改变view的背景色

作业二（创建一个Book类, Book中有书名和书的内容两个属性, 实现手势切换）

import UIKit
class Book: NSObject {
    var titleName:String?
    var content:String?
    init(titleName:String,content:String) {
        self.titleName = titleName
        self.content = content
    }
}
class ViewController: UIViewController {

    var bookArr = [Book]()//书的数组
    var titleLabel:UILabel! = nil
    var contentLabel:UILabel! = nil
    var index:Int = 0  //显示第0本书
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        for index in 0...5{
            let book = Book(titleName: "第\(index)篇文章", content: "第\(index)篇文章的内容")
            
           self.bookArr.append(book)
        }
       //初始化手势
        let swip = UISwipeGestureRecognizer()
        swip.direction = .left
        self.view.addGestureRecognizer(swip)
        
        swip.addTarget(self, action: #selector(swipAction(swip:)))
        
        let swip1 = UISwipeGestureRecognizer()
        swip1.direction = .right
        self.view.addGestureRecognizer(swip1)
        
        swip1.addTarget(self, action: #selector(swipAction(swip:)))

        //添加两个label
        self.titleLabel = UILabel(frame: CGRect(x: 100, y: 100, width: 100, height: 40))
        self.view.addSubview(titleLabel)
        
        self.contentLabel = UILabel(frame: CGRect(x: 100, y: 200, width: 300, height: 40))
        self.view.addSubview(contentLabel)
        
        //加载内容
        //先获取第0本书
        let currentBook = bookArr[index]
        self.titleLabel.text = currentBook.titleName
        self.contentLabel.text = currentBook.content
    }
    
    func swipAction(swip:UISwipeGestureRecognizer){
       
        //判断方向
        if swip.direction == .right {
            index-=1
            if index < 0 {
                index = bookArr.count - 1
            }
        } else if swip.direction == .left {
            index+=1
            if index >= bookArr.count {
                index = 0
            }
        }
        let currentBook = bookArr[index]
        self.titleLabel.text = currentBook.titleName
        self.contentLabel.text = currentBook.content
        
    }
}

**运行结果如下图所示

作业三（注册界面）

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        var label = UILabel(frame: CGRect(x: 100, y: 50, width: 100, height: 40))
        label.text = "注册"
        label.textColor = #colorLiteral(red: 0.2392156869, green: 0.6745098233, blue: 0.9686274529, alpha: 1)
        label.textAlignment = .center
        self.view.addSubview(label)
        
        var usename = UITextField(frame: CGRect(x: 50, y: 100, width: 200, height: 50))
        
        usename.textColor = #colorLiteral(red: 0, green: 0, blue: 0, alpha: 1)
        usename.backgroundColor = #colorLiteral(red: 0.501960814, green: 0.501960814, blue: 0.501960814, alpha: 1)
        usename.leftView = UIImageView(image: UIImage(named: "xr.png"))
        usename.leftViewMode = .always
        self.view.addSubview(usename)
        usename.placeholder = "请输入用户名"
        //编辑时出现（❌）
        usename.clearButtonMode = .whileEditing
        usename.borderStyle = .roundedRect
        
        var password = UITextField(frame: CGRect(x: 50, y: 180, width: 200, height: 50))
        password.textColor = #colorLiteral(red: 0, green: 0, blue: 0, alpha: 1)
        password.backgroundColor = #colorLiteral(red: 0.501960814, green: 0.501960814, blue: 0.501960814, alpha: 1)
        password.leftView = UIImageView(image: UIImage(named: "yaoshi.jpg"))
        password.leftViewMode = .always
        self.view.addSubview(password)
        password.placeholder = "请输入密码"
        password.borderStyle = .roundedRect
        password.clearButtonMode = .whileEditing
        
        var btn = UIButton(type: .system)
        btn.addTarget(self, action: #selector(btnAction(btn:)), for: .valueChanged)
        btn.setTitle("注册", for: .normal)
        btn.frame = CGRect(x: 200, y: 240, width: 50, height: 50)
        self.view.addSubview(btn)
        
        var enter = UIButton(type: .system)
        enter.addTarget(self, action: #selector(enterAction(enter:)), for: .valueChanged)
        enter.frame = CGRect(x: 60, y: 240, width: 50, height: 50)
        enter.setTitle("登录", for: .normal)
        self.view.addSubview(enter)
       
    }
    func btnAction(btn:UIButton){
        print("注册成功")
    }

    func enterAction(enter:UIButton){
        print("登录成功")
    }
    
}

**运行结果如下图所示