MacOS（macOS Monterey12.0.1）、Xcode（13.1）、swift（5.5.1）
現在、FCalenderを利用してタスクを表示するアプリを開発しているます。
どのようにしたらカレンダーにて日付けをタッチしたら必ずラベルに対して日時を表示してからデータベースからデータを持ってくるメソッドを実行できるようになりますでしょうか？
Thread 1: Fatal error: Unexpectedly found nil while unwrapping an Optional value
すいません原因がよくわからないので少し長いですがソースを貼ります。
swift
1 //選択日付を表示する
2 func calendar ( _ calendar : FSCalendar , didSelect date : Date , at monthPosition : FSCalendarMonthPosition ) {
3 //選択日付をフォーマット
4 let tmpDate = Calendar ( identifier : . gregorian )
5 let year = tmpDate . component ( . year , from : date )
6 let month = tmpDate . component ( . month , from : date )
7 let day = tmpDate . component ( . day , from : date )
8 let formatDate = getFormattedDateString ( dateString : " \( year ) \( month ) \( day ) " )
9 labelDate . text = formatDate
10 TableView . reloadData ( )
11 }
12
13 func getFormattedDateString ( dateString : String , from fromFormat : String = "yyyyMdd" , to toFormat : String = "yyyy年MM月dd日" ) - > String ? {
14 let dateFormatter = DateFormatter ( )
15 dateFormatter . locale = . current
16 dateFormatter . dateFormat = fromFormat
17 guard let date = dateFormatter . date ( from : dateString ) else { return nil }
18 dateFormatter . dateFormat = toFormat
19 return dateFormatter . string ( from : date )
20 }
21
22 // 任意の日付に点マークをつける
23 func calendar ( _ calendar : FSCalendar , numberOfEventsFor date : Date ) - > Int {
24
25 let formatter = DateFormatter ( )
26 formatter . dateFormat = "yyyy年MM月dd日"
27 formatter . calendar = Calendar ( identifier : . gregorian )
28 formatter . timeZone = TimeZone . current
29 formatter . locale = Locale . current
30 let calendarDay = formatter . string ( from : date )
31
32 // Realmオブジェクトの生成
33 let realm = try ! Realm ( )
34 // 参照（全データを取得）
35 let todos = realm . objects ( calender . self )
36
37 if todos . count > 0 {
38 for i in 0 . . < todos . count {
39 if i == 0 {
40 datesWithEvents = [ todos [ i ] . date ]
41 } else {
42 datesWithEvents . insert ( todos [ i ] . date )
43 }
44 }
45 } else {
46 datesWithEvents = [ ]
47 }
48 return datesWithEvents . contains ( calendarDay ) ? 1 : 0
49 }
50
51 var selectdate : String ?
52 //プラスボタンクリック
53 @IBAction func plusBottun ( _ sender : Any ) {
54
55 selectdate = labelDate . text
56 //画面遷移(スケジュール登録ページ)
57 // SubViewController へ遷移するために Segue を呼び出す
58 performSegue ( withIdentifier : "out" , sender : nil )
59 }
60
61
62
63 @IBAction func MinusButton ( _ sender : Any ) {
64 selectdate = labelDate . text
65 //画面遷移(スケジュール登録ページ)
66 // SubViewController へ遷移するために Segue を呼び出す
67 performSegue ( withIdentifier : "income" , sender : nil )
68 }
69
70 // Segue 準備
71 override func prepare ( for segue : UIStoryboardSegue , sender : Any ! ) {
72 //プラスボタンクリック時
73 if ( segue . identifier == "out" ) {
74 let calender = ( segue . destination as ? out ) !
75 //選択した日付けを次画面へ
76 calender . selectdate = selectdate
77 } else if ( segue . identifier == "income" ) {
78 let calender = ( segue . destination as ? income ) !
79 calender . selectdate = selectdate
80 }
81 }
82
83
84
85 //データベース上に保存されているデータを配列に格納する。
86 func getModel ( date : String ) - > [ [ String : String ] ] {
87 let realm = try ! Realm ( )
88 let results = realm . objects ( calender . self ) . filter ( "date == %@" , date )
89 var param : [ [ String : String ] ] = [ ]
90 for result in results {
91 param . append ( [ "reason" : result . reason ,
92 "money" : String ( result . AmountOfMoney ) ,
93 "date" : result . date ,
94 "flag" : result . flag
95 ] )
96
97 }
98 return param
99 }
100
101 //セルの編集許可
102 func tableView ( _ tableView : UITableView , canEditRowAt indexPath : IndexPath ) - > Bool
103 {
104 return true
105 }
106
107 func tableView ( _ tableView : UITableView , trailingSwipeActionsConfigurationForRowAt indexPath : IndexPath ) - > UISwipeActionsConfiguration ? {
108 let action = UIContextualAction ( style : . destructive ,
109 title : "削除" ) { ( action , view , completionHandler ) in
110 self . showAlert ( deleteIndexPath : indexPath )
111 completionHandler ( true )
112 }
113 action . backgroundColor = . red
114 let configuration = UISwipeActionsConfiguration ( actions : [ action ] )
115 return configuration
116 }
117
118 func showAlert ( deleteIndexPath indexPath : IndexPath ) {
119 let date = labelDate . text !
120 let dialog = UIAlertController ( title : "削除" ,
121 message : "削除してよろしいですか？" ,
122 preferredStyle : . alert )
123 var array = getModel ( date : date )
124 dialog . addAction ( UIAlertAction ( title : "削除" , style : . default , handler : { ( _ ) in
125 array . remove ( at : indexPath . row )
126 self . deleteModel ( selectedDate : date , indexPath : indexPath . row )
127 self . TableView . deleteRows ( at : [ indexPath ] , with : . automatic )
128
129 } ) )
130 dialog . addAction ( UIAlertAction ( title : "やめる" , style : . cancel , handler : nil ) )
131 self . present ( dialog , animated : true , completion : nil )
132 }
133 }
134
135 extension calendar : UITableViewDelegate , UITableViewDataSource {
136 //セルの個数を返すメソッド
137 func tableView ( _ tableView : UITableView , numberOfRowsInSection section : Int ) - > Int {
138 let length : Int = getModel ( date : labelDate . text ! ) . count
139 return length
140
141
142 }
143
144 //セクション内に表示するセルのテキストを返すメソッド
145 func tableView ( _ tableView : UITableView , cellForRowAt IndexPath : IndexPath ) - > UITableViewCell {
146 let cell = TableView . dequeueReusableCell ( withIdentifier : "calendarCell" , for : IndexPath )
147 let data = getModel ( date : labelDate . text ! ) [ IndexPath . row ]
148 let reasonLabel = cell . contentView . viewWithTag ( 1 ) as ! UILabel
149 let dateLabel = cell . contentView . viewWithTag ( 2 ) as ! UILabel
150 let moneyLabel = cell . contentView . viewWithTag ( 3 ) as ! UILabel
151 //支出なら色を変える
152 if ( data [ "flag" ] == "0" ) {
153 reasonLabel . textColor = UIColor . red
154 dateLabel . textColor = UIColor . red
155 moneyLabel . textColor = UIColor . red
156 }
157 if let reason = data [ "reason" ] ? . description ,
158 let date = data [ "date" ] ? . description ,
159 let money = data [ "money" ] ? . description {
160 reasonLabel . text = reason
161 dateLabel . text = date
162 moneyLabel . text = " \( money ) 円"
163 }
164
165 return cell
166 }
167
168
169
170
171
172
173
174 func deleteModel ( selectedDate : String , indexPath : Int ) {
175 let realm = try ! Realm ( )
176 let results = realm . objects ( calender . self ) . filter ( "date == ' \( selectedDate ) '" )
177 do {
178 try realm . write {
179 realm . delete ( results [ indexPath ] )
180 getModel ( date : labelDate . text ! )
181 }
182 } catch {
183 print ( "delete data error." )
184 }
185 }
186 }
187
Q&A
