addTargetのViewControllerに関するエラー

Type "ViewController" has no member "num"というエラーが出ます。UIButtonをタップした時にUILabelに"0"を表示させたいのですが、いろいろ試行錯誤していますが、うまくいきません。

import UIKit

class ViewController: UIViewController {

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    self.Calculation()
}

func Calculation(){
    
    let backView = UIView() //背景
    backView.frame = CGRect(x:0.8, y:20.0, width:373.0, height:646.0)
    backView.backgroundColor = UIColor.whiteColor()
    self.view.addSubview(backView)
    
    
    let label0 = UIButton() //1
    label0.frame = CGRectMake(230, 10, 40, 40)
    label0.backgroundColor = UIColor.blackColor()
    label0.setTitle("0", forState: .Normal)
    label0.setTitleColor(UIColor.cyanColor(), forState: UIControlState .Normal)
    label0.titleLabel!.font =  UIFont.systemFontOfSize(29)
    label0.tag = 0
    label0.addTarget(self, action: #selector(ViewController.num(_:)), forControlEvents: UIControlEvents .TouchDown) ここでエラーが出ます
    backView.addSubview(label0)
    
           
    let labelresult = UILabel()
    labelresult.frame = CGRectMake(1,60,370,210)
    labelresult.backgroundColor = UIColor.redColor()
    backView.addSubview(labelresult)
    
    func num(sender:UIButton){
        switch sender.tag {
        case 0 :
            labelresult.text = "0"
        default:break
        }
    }
}

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

}
エラーの原因だけでなく、これ以外にやり方があるのならば教えてください!m(_)m

行動規範の内容に同意します

回答1件

ベストアンサー

以下の２点を修正することで"０"が表示されます。

swift
1
2func Calculation(){
3    // ボタン生成等・・・
4}
5
6// 変更①
7// ViewControllerのメソッドとして呼び出せる様にCalculation()メソッドのブロックから外に出します。
8func num(sender:UIButton){
9    switch sender.tag {
10    case 0 :
11        labelresult.text = "0"
12    default:break
13    }
14}
15
16// 上記を修正するとlabelresultが定義されていないとエラーになりますので、以下の様にlabelresultをインスタンス変数で定義します。
17// ※ Calculation()の中にある let labelresult = UILabel()は消してください。
18// 変更②
19import UIKit
20
21class ViewController: UIViewController {
22    let labelresult = UILabel()
23    // ・・・
24}

よくよく見ると今回の回答は
前回の質問(Thread 1 : breakpoint 1.1)のTakeOneさんの回答１と２ですね。

回答追記

swift
1import UIKit
2
3class ViewController: UIViewController {
4    
5    let labelresult = UILabel() //計算結果を表示させる
6    
7    override func viewDidLoad() {
8        super.viewDidLoad()
9        // Do any additional setup after loading the view, typically from a nib.
10        self.Calculation()
11    }
12    
13    func Calculation() {
14        
15        let backView = UIView() //背景
16        backView.frame = CGRect(x:0.8, y:20.0, width:373.0, height:646.0)
17        backView.backgroundColor = UIColor.whiteColor()
18        self.view.addSubview(backView)
19        
20        let label0 = UIButton() //1
21        label0.frame = CGRectMake(230, 10, 40, 40)
22        label0.backgroundColor = UIColor.blackColor()
23        label0.setTitle("0", forState: .Normal)
24        label0.setTitleColor(UIColor.cyanColor(), forState: UIControlState .Normal)
25        label0.titleLabel!.font =  UIFont.systemFontOfSize(29)
26        label0.addTarget(self, action: #selector(ViewController.num(_:)), forControlEvents: UIControlEvents .TouchDown)
27        label0.tag = 0
28        backView.addSubview(label0)
29        
30        let label1 = UIButton() //1
31        label1.frame = CGRectMake(1, 272, 124, 124)
32        label1.backgroundColor = UIColor.redColor()
33        label1.setTitle("1", forState: .Normal)
34        label1.setTitleColor(UIColor.cyanColor(), forState: UIControlState.Normal)
35        label1.titleLabel!.font =  UIFont.systemFontOfSize(29)
36        label1.tag = 1
37        backView.addSubview(label1)
38        
39        let label2 = UIButton() //2
40        label2.frame = CGRectMake(126, 272, 124, 124)
41        label2.backgroundColor = UIColor.redColor()
42        label2.setTitle("2", forState: .Normal)
43        label2.setTitleColor(UIColor.cyanColor(), forState: UIControlState.Normal)
44        label2.titleLabel!.font =  UIFont.systemFontOfSize(29)
45        label2.tag = 2
46        backView.addSubview(label2)
47        
48        let label3 = UIButton() //3
49        label3.frame = CGRectMake(251,272, 124, 124)
50        label3.backgroundColor = UIColor.redColor()
51        label3.setTitle("3", forState: .Normal)
52        label3.setTitleColor(UIColor.cyanColor(), forState: UIControlState.Normal)
53        label3.titleLabel!.font =  UIFont.systemFontOfSize(29)
54        label3.tag = 3
55        backView.addSubview(label3)
56        
57        let label4 = UIButton() //4
58        label4.frame = CGRectMake( 1, 397, 124, 124)
59        label4.backgroundColor = UIColor.blackColor()
60        label4.setTitle("4", forState: .Normal)
61        label4.setTitleColor(UIColor.cyanColor(), forState: UIControlState.Normal)
62        label4.titleLabel!.font =  UIFont.systemFontOfSize(29)
63        label4.tag = 4
64        backView.addSubview(label4)
65        
66        let label5 = UIButton() //5
67        label5.frame = CGRectMake(126,397, 124, 124)
68        label5.backgroundColor = UIColor.blackColor()
69        label5.setTitle("5", forState: .Normal)
70        label5.setTitleColor(UIColor.cyanColor(), forState: UIControlState.Normal)
71        label5.titleLabel!.font =  UIFont.systemFontOfSize(29)
72        label5.tag = 5
73        backView.addSubview(label5)
74        
75        let label6 = UIButton() //6
76        label6.frame = CGRectMake(251, 397, 124, 124)
77        label6.backgroundColor = UIColor.blackColor()
78        label6.setTitle("6", forState: .Normal)
79        label6.setTitleColor(UIColor.cyanColor(), forState: UIControlState.Normal)
80        label6.titleLabel!.font =  UIFont.systemFontOfSize(29)
81        label6.tag = 6
82        backView.addSubview(label6)
83        
84        let label7 = UIButton() //7
85        label7.frame = CGRectMake(1, 522, 124, 124)
86        label7.backgroundColor = UIColor.blueColor()
87        label7.setTitle("7", forState: .Normal)
88        label7.setTitleColor(UIColor.cyanColor(), forState: UIControlState.Normal)
89        label7.titleLabel!.font =  UIFont.systemFontOfSize(29)
90        label7.tag = 7
91        backView.addSubview(label7)
92        
93        let label8 = UIButton() //8
94        label8.frame = CGRectMake(126, 522, 124, 124)
95        label8.backgroundColor = UIColor.blueColor()
96        label8.setTitle("8", forState: .Normal)
97        label8.setTitleColor(UIColor.cyanColor(), forState: UIControlState.Normal)
98        label8.titleLabel!.font =  UIFont.systemFontOfSize(29)
99        label6.tag = 8
100        backView.addSubview(label8)
101        
102        let label9 = UIButton()   //9
103        label9.frame = CGRectMake(251, 522, 124, 124)
104        label9.backgroundColor = UIColor.blueColor()
105        label9.setTitle("9", forState: .Normal)
106        label9.setTitleColor(UIColor.cyanColor(), forState: UIControlState.Normal)
107        label9.titleLabel!.font =  UIFont.systemFontOfSize(29)
108        label6.tag = 9
109        backView.addSubview(label9)
110        
111        //足し算
112        let labelplus = UIButton()
113        labelplus.frame = CGRect(x: 10, y: 10, width: 40, height: 40)
114        labelplus.backgroundColor = UIColor.blackColor()
115        labelplus.setTitle("+", forState: .Normal)
116        labelplus.setTitleColor(UIColor.cyanColor(), forState: UIControlState.Normal)
117        labelplus.titleLabel!.font =  UIFont.systemFontOfSize(29)
118        labelplus.tag = 01
119        backView.addSubview(labelplus)
120        
121        let labelminus = UIButton()   //引き算
122        labelminus.frame = CGRect(x: 60, y: 10, width: 40, height: 40)
123        labelminus.backgroundColor = UIColor.blackColor()
124        labelminus.setTitle("-", forState: .Normal)
125        labelminus.setTitleColor(UIColor.cyanColor(), forState: UIControlState.Normal)
126        labelminus.titleLabel!.font =  UIFont.systemFontOfSize(29)
127        labelminus.tag = 02
128        backView.addSubview(labelminus)
129        
130        let labelproduct = UIButton() //掛け算
131        labelproduct.frame = CGRect(x: 110, y: 10, width: 40, height: 40)
132        labelproduct.backgroundColor = UIColor.blackColor()
133        labelproduct.setTitle("x", forState: .Normal)
134        labelproduct.setTitleColor(UIColor.cyanColor(), forState: UIControlState.Normal)
135        labelproduct.titleLabel!.font =  UIFont.systemFontOfSize(29)
136        labelproduct.tag = 03
137        backView.addSubview(labelproduct)
138        
139        let labelquontient = UIButton() //割り算
140        labelquontient.frame = CGRect(x: 180, y: 10, width: 40, height: 40)
141        labelquontient.backgroundColor = UIColor.blackColor()
142        labelquontient.setTitle("/", forState: .Normal)
143        labelquontient.setTitleColor(UIColor.cyanColor(), forState: UIControlState.Normal)
144        labelquontient.titleLabel!.font =  UIFont.systemFontOfSize(29)
145        labelquontient.tag = 04
146        backView.addSubview(labelquontient)
147        
148        let labelclear = UIButton() //現在の計算結果を0にリセット
149        labelclear.frame = CGRect(x: 280, y: 10, width: 40, height: 40)
150        labelclear.backgroundColor = UIColor.blackColor()
151        labelclear.setTitle("C", forState: .Normal)
152        labelclear.setTitleColor(UIColor.cyanColor(), forState: UIControlState.Normal)
153        labelclear.titleLabel!.font =  UIFont.systemFontOfSize(29)
154        labelclear.tag = 05
155        backView.addSubview(labelclear)
156        
157        
158        labelresult.frame = CGRect(x: 1, y: 60, width: 370, height: 210)
159        labelresult.backgroundColor = UIColor.lightGrayColor()
160        backView.addSubview(labelresult)
161    }
162    
163    func num(sender:UIButton){
164        switch sender.tag {
165        case 0:
166            labelresult.text = "0"
167        default: break
168        }
169    }
170    
171    override func didReceiveMemoryWarning() {
172        super.didReceiveMemoryWarning() 
173        // Dispose of any resources that can be recreated. 
174    }
175    
176}