質問編集履歴
4
利用できない変数に書き直してしまっていたため修正、エラー文言も違ったので修正
test
CHANGED
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File without changes
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test
CHANGED
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@@ -20,7 +20,7 @@
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20
20
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21
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### エラー内容
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22
22
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23
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-
>
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23
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+
> Cannot convert value of type '(Item?) -> ()' to expected argument type '(A.T?) -> Void' (aka '(Optional<Item>) -> ()')
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24
24
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25
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@@ -32,9 +32,9 @@
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32
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33
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protocol P {
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34
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35
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-
associatedtype T
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35
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+
associatedtype T: Codable
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36
36
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37
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-
static func get(request: Request, completion: @escaping(_ data: T
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37
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+
static func get(request: Request, completion: @escaping(_ data: T?) -> Void)
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38
38
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}
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40
40
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@@ -42,13 +42,13 @@
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42
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extension P {
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44
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45
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-
static func get(request: Request, completion: @escaping(_ data: T
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45
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+
static func get(request: Request, completion: @escaping(_ data: T?) -> Void) {
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46
46
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let jsonData = getSomeJsonData()
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48
48
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do {
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50
50
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51
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-
let data = try JSONDecoder().decode(T
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51
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+
let data = try JSONDecoder().decode(T.self, from: jsonData)
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52
52
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53
53
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completion(data)
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54
54
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@@ -68,7 +68,7 @@
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68
68
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69
69
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class A: P {
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70
70
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71
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-
typealias T
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71
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+
typealias T = Item // ItemはCodableなstruct
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72
72
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73
73
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}
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74
74
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@@ -80,7 +80,7 @@
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80
80
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81
81
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func printItem() {
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82
82
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83
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-
A.get(request: request) { (data: Item?) in // エラー！
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83
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+
A.get(request: request) { (data: Item?) in // エラー！ Cannot convert value of type '(Item?) -> ()' to expected argument type '(A.T?) -> Void' (aka '(Optional<Item>) -> ()')
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84
84
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85
85
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print(data)
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86
86
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3
実際の変数名が入ってしまっていたので修正
test
CHANGED
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File without changes
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test
CHANGED
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@@ -44,9 +44,11 @@
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44
44
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45
45
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static func get(request: Request, completion: @escaping(_ data: Type?) -> Void) {
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46
46
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47
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+
let jsonData = getSomeJsonData()
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48
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+
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47
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do {
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48
50
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49
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-
let data = try JSONDecoder().decode(
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51
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+
let data = try JSONDecoder().decode(Type.self, from: jsonData)
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50
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51
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completion(data)
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52
54
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2
extension P の中のメソッドが実態に即していなかったため修正
test
CHANGED
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File without changes
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test
CHANGED
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@@ -44,9 +44,19 @@
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44
44
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45
45
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static func get(request: Request, completion: @escaping(_ data: Type?) -> Void) {
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46
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47
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-
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47
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+
do {
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48
48
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49
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+
let data = try JSONDecoder().decode(ResultDataType.self, from: jsonData)
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50
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+
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49
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-
completion(
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51
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+
completion(data)
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52
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+
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53
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+
} catch {
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54
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+
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55
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+
print(error.localizedDescription)
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56
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+
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57
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+
completion(nil)
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58
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+
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59
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+
}
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50
60
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51
61
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}
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52
62
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@@ -66,7 +76,7 @@
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66
76
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67
77
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class B {
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68
78
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69
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-
func
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79
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+
func printItem() {
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70
80
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71
81
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A.get(request: request) { (data: Item?) in // エラー！ 'Item' is not convertible to 'A.Type' (aka 'Item')
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72
82
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1
実際の実装と差異がありました。
test
CHANGED
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File without changes
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test
CHANGED
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@@ -40,17 +40,23 @@
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40
40
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41
41
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42
42
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43
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-
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43
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+
extension P {
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44
44
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45
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-
typealias Type = Item // ItemはCodableなstruct
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46
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-
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47
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-
static func get(request: Request, completion: @escaping(_ data:
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45
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+
static func get(request: Request, completion: @escaping(_ data: Type?) -> Void) {
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48
46
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49
47
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let item = Item()
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50
48
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51
49
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completion(item)
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52
50
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53
51
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}
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52
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+
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53
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+
}
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54
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+
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55
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+
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56
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+
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57
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+
class A: P {
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58
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+
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59
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+
typealias Type = Item // ItemはCodableなstruct
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54
60
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55
61
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}
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56
62
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