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typo and code format (#1217)

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This commit is contained in:
Jie Liu
2023-03-04 11:19:02 +08:00
committed by GitHub
parent fe2c9ede92
commit 9a000a2ff0
1 changed files with 16 additions and 15 deletions
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31
source/01_welcome_to_swift/03_a_swift_tour.md
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@ -626,22 +626,23 @@ let threeOfSpadesDescription = threeOfSpades.simpleDescription()
使用 `async` 标记异步运行的函数 使用 `async` 标记异步运行的函数
```swift ```swift
func fetchUserID(from server: String) async -> Int{ func fetchUserID(from server: String) async -> Int {
if server == "primary" if server == "primary" {
return 97 return 97
}
return 501
} }
return 501
``` ```
您还可以通过在函数名前添加 `await` 来标记对异步函数的调用 您还可以通过在函数名前添加 `await` 来标记对异步函数的调用
```swift ```swift
func fetchUsername(from server:String) async -> String{ func fetchUsername(from server: String) async -> String {
let userID = await fetchUserID(from: server) let userID = await fetchUserID(from: server)
if userID == 501{ if userID == 501 {
return "John Appleseed" return "John Appleseed"
} }
return "Guest" return "Guest"
} }
``` ```
@ -649,11 +650,11 @@ func fetchUsername(from server:String) async -> String{
使用 `await` 以使用该异步函数返回的值。 使用 `await` 以使用该异步函数返回的值。
```swift ```swift
func connectUser(to server: String) async{ func connectUser(to server: String) async {
async let userID = fetchUserID(from: server) async let userID = fetchUserID(from: server)
async let username = fetchUsername(from: server) async let username = fetchUsername(from: server)
let greeting = await "Hello \(username), user ID \(userID)" let greeting = await "Hello \(username), user ID \(userID)"
print(greeting) print(greeting)
} }
``` ```