swift　Viewのサイズがうまくいかない

swift
1import UIKit
2
3class ViewController: UIViewController {
4    
5    var correctAnswer:Int?
6    var iv:UIImageView?
7    var questionView = UITextView()
8    var buttonList:[UIButton] = []
9    
10    var quizList:[Quiz] = Array(Quiz.defQuizzes)
11    
12    
13    var num = 0
14    var correctCount = 0
15    
16    override func viewDidLoad() {
17        super.viewDidLoad()
18        // Do any additional setup after loading the view.
19        
20        iv = setUpJudgmentImage()
21        
22        questionView = setUpquestion(contents: quizList[num].question)
23        
24        correctAnswer = quizList[num].answer
25        
26        let c = setUpChoices(c1: quizList[num].choices[0], c2: quizList[num].choices[1], c3: quizList[num].choices[2])
27        buttonList.append(c.0)
28        buttonList.append(c.1)
29        buttonList.append(c.2)
30    }
31    
32    func setUpquestion(contents:String) -> UITextView{
33        let question = UITextView()
34        question.isEditable = false
35        question.backgroundColor = .systemBlue
36        question.isSelectable = false
37        question.font = UIFont.systemFont(ofSize: 23)
38        question.textColor = .lightGray
39        question.text = contents
40        question.sizeToFit()
41        question.center = self.view.center
42        
43        self.view.addSubview(question)
44        
45        return question
46    }
47    
48    func modQuestion(view: UITextView,contents:String){
49        view.text = contents//位置が問題変わるごとに変わっていくバグ
50        view.sizeToFit()
51    }
52    
53    func setUpChoices(c1:String,c2:String,c3:String) -> (UIButton,UIButton,UIButton){
54        let button1 = UIButton()
55        button1.setTitle(c1, for: .normal)
56        button1.sizeToFit()
57        button1.setTitleColor(.systemBlue, for: .normal)
58        button1.center = CGPoint(x: self.view.bounds.width / 4, y: self.view.bounds.height * 3 / 4)
59        button1.tag = 0
60        button1.addTarget(self, action: #selector(buttonAction(_:)), for: .touchUpInside)
61        self.view.addSubview(button1)
62        
63        let button2 = UIButton()
64        button2.setTitle(c2, for: .normal)
65        button2.sizeToFit()
66        button2.setTitleColor(.systemBlue, for: .normal)
67        button2.center = CGPoint(x: self.view.bounds.width / 2, y: self.view.bounds.height * 3 / 4)
68        button2.tag = 1
69        button2.addTarget(self, action: #selector(buttonAction(_:)), for: .touchUpInside)
70        self.view.addSubview(button2)
71        
72        let button3 = UIButton()
73        button3.setTitle(c3, for: .normal)
74        button3.sizeToFit()
75        button3.setTitleColor(.systemBlue, for: .normal)
76        button3.center = CGPoint(x: self.view.bounds.width * 3 / 4, y: self.view.bounds.height * 3 / 4)
77        button3.tag = 2
78        button3.addTarget(self, action: #selector(buttonAction(_:)), for: .touchUpInside)
79        self.view.addSubview(button3)
80        
81        return (button1,button2,button3)
82    }
83    
84    func modButton(button:UIButton,str:String?){
85        button.isEnabled = true//次のボタンでは押せるようにする
86        button.setTitle(str, for: .normal)
87        button.sizeToFit()
88        
89    }
90    
91    @objc func buttonAction(_ sender:UIButton){
92        
93        if let ansNum = correctAnswer{
94            if sender.tag == ansNum{
95                print("正解")
96                judgmentImage(bool: true)
97                correctCount += 1
98            }else{
99                print("不正解")
100                judgmentImage(bool: false)
101            }
102        }else{
103            print("エラー")
104            judgmentImage(bool: nil)
105        }
106        
107        num += 1
108        //一回ボタンを押したら押したボタンと他のボタンを押せなくする処理
109        buttonList[0].isEnabled = false
110        buttonList[1].isEnabled = false
111        buttonList[2].isEnabled = false
112        
113        
114        DispatchQueue.main.asyncAfter(deadline: .now() + 5){
115            if self.num == self.quizList.count {
116                self.modQuestion(view: self.questionView, contents: "あなたの正解数は")
117                self.iv?.isHidden = true
118                self.modButton(button: self.buttonList[0], str: nil)
119                self.modButton(button: self.buttonList[1], str: nil)
120                self.modButton(button: self.buttonList[2], str: nil)
121                
122                let _ = self.correctCountView()
123            }else{
124                self.iv?.isHidden = true
125                self.iv = self.setUpJudgmentImage()
126                self.modQuestion(view: self.questionView, contents: self.quizList[self.num].question)
127                
128                self.correctAnswer = self.quizList[self.num].answer
129                
130                self.modButton(button: self.buttonList[0], str: self.quizList[self.num].choices[0])
131                self.modButton(button: self.buttonList[1], str: self.quizList[self.num].choices[1])
132                self.modButton(button: self.buttonList[2], str: self.quizList[self.num].choices[2])
133            }
134            
135    }
136    }
137    
138    func setUpJudgmentImage() -> UIImageView{
139        let imageView = UIImageView(image: nil)
140        imageView.frame = CGRect(x: 0, y: 0, width: self.view.bounds.width / 2, height: self.view.bounds.width / 2)
141        imageView.center = CGPoint(x: self.view.bounds.width / 2, y: self.view.bounds.width / 2)
142        self.view.addSubview(imageView)
143        
144        return imageView
145    }
146    
147    func judgmentImage(bool:Bool?){
148        if let b = bool{
149            if b{
150                iv?.image = UIImage(named: "mark_maru")
151            }else{
152                iv?.image = UIImage(named: "mark_batsu")
153            }
154        }else{
155            iv?.image = nil
156        }
157    }
158    
159    func correctCountView() -> UITextView{
160        let correctCountView = UITextView()
161        correctCountView.isEditable = false
162        correctCountView.isSelectable = false
163        correctCountView.textColor = .systemRed
164        correctCountView.font = UIFont.systemFont(ofSize: 60)
165        correctCountView.textAlignment = .center
166        correctCountView.text = String(correctCount)
167        correctCountView.sizeToFit()
168        correctCountView.center = CGPoint(x: self.view.bounds.width / 2, y: self.view.bounds.height * 2 / 3)
169        self.view.addSubview(correctCountView)
170        
171        return correctCountView
172    }
173}
174

swift
1struct Quiz:Hashable {
2    var question:String
3    var choices:Array<String>
4    var answer:Int
5    var quizList:Set<Quiz>
6    
7    static var defQuizzes:Set<Quiz>{
8        get{
9            var q = "富士山の標高は？"
10            var c = ["3776m","3190m","3193m"]
11            var a = 0
12            var quiz = Quiz(question: q, choices: c, answer: a)
13            quiz.add(quiz: quiz)
14            
15            
16            q = "渋沢栄一は何円札？"
17            c = ["一万円札","五千円札","千円札"]
18            a = 0
19            quiz.add(quiz: Quiz(question: q, choices: c, answer: a))
20            
21            q = "1+1 = ?"
22            c = ["1","2","3"]
23            a = 1
24            quiz.add(quiz: Quiz(question: q, choices: c, answer: a))
25            
26            q = "エベレストの標高は？"
27            c = ["7500m","8849m","8006m"]
28            a = 1
29            quiz.add(quiz: Quiz(question: q, choices: c, answer: a))
30            
31            q = "日本の人口は？"
32            c = ["1億2000万","8000万","5000万"]
33            a = 0
34            quiz.add(quiz: Quiz(question: q, choices: c, answer: a))
35            
36            return quiz.quizList
37        }
38    }
39    
40    init(question:String,choices:Array<String>,answer:Int){
41        self.question = question
42        self.choices = choices
43        self.answer = answer
44        quizList = []
45    }
46    
47    
48    mutating func add(quiz:Quiz){
49        quizList.insert(quiz)
50    }
51    
52    
53}