신속하게 줄 바꿈없이 인쇄

신속하게 줄 바꿈없이 인쇄

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swift 2.0에서는 print()자동으로 개행 문자를 추가합니다. 신속한 1.2, println()및 print()개별 기능 사용. 그래서 swift는 더 이상 줄 바꿈을 추가하지 않는 인쇄 기능이 없기 때문에 텍스트를 인쇄하고 줄 바꿈을 추가하지 않는 방법은 무엇입니까?

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Swift 2.0부터 개행없이 인쇄하는 권장 방법은 다음과 같습니다.

print("Hello", terminator:"")

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print기능은 Swift 의 후반 개정 이후 완전히 변경 되었으므로 이제 훨씬 간단 해 보이며 표준 콘솔에 인쇄 할 수있는 다양한 방법이 있습니다.

인쇄를위한 메서드 서명은 다음과 같습니다.

public func print<Target>(_ items: Any..., separator: String = default, terminator: String = default, to output: inout Target) where Target : TextOutputStream

여기 몇 가지 사용 사례가 있습니다.

print("Swift is awesome.")
print("Swift", "is", "awesome", separator:" ")
print("Swift", "is", "awesome", separator:" ", terminator:".")

인쇄물:

Swift is awesome.
Swift is awesome
Swift is awesome.

연결

print("This is wild", terminator: " ")
print("world")

인쇄물:

This is wild world

따라서 터미네이터를 사용하면 내용이 같은 줄과 관련이 있는지주의해야합니다.

CustomStringConvertible로 개체 인쇄

struct Address {
  let city: String
}

class Person {
  let name = "Jack"
  let addresses = [
    Address(city: "Helsinki"),
    Address(city: "Tampere")
  ]
}

extension Person: CustomStringConvertible {
  var description: String {
    let objectAddress = unsafeBitCast(self, to: Int.self)
    return String(format: "<name: \(name) %p>", objectAddress)
  }
}

let jack = Person()
print(jack)

인쇄물:

<name: Jack 0x608000041c20>

CustomDebugStringConvertible

extension Person: CustomDebugStringConvertible {
  var debugDescription: String {
    let objectAddress = unsafeBitCast(self, to: Int.self)

    let addressString = addresses.map { $0.city }.joined(separator: ",")
    return String(format: "<name: \(name), addresses: \(addressString) %p>",objectAddress)
  }
}

Now, with lldb, you can use po command and it will print object as this in lldb console,

<name: Jack, addresses: Helsinki,Tampere 0x60c000044860>

Logging to file using TextOutputStream

struct MyStreamer: TextOutputStream {

  lazy var fileHandle: FileHandle? = {
    let fileHandle = FileHandle(forWritingAtPath: self.logPath)
    return fileHandle
  }()

  var logPath: String = "My file path"

  mutating func write(_ string: String) {
    fileHandle?.seekToEndOfFile()
    fileHandle?.write(string.data(using:.utf8)!)
  }
}

Now, using print to stream,

print("First of all", to: &myStream )
print("Then after", to: &myStream)
print("And, finally", to: &myStream)

Prints to file:

First of all
Then after
And finally

CustomReflectable

extension Person: CustomReflectable {
  var customMirror: Mirror {
    return Mirror(self, children: ["name": name, "address1": addresses[0], "address2": addresses[1]])
  }
}

Now, in lldb debugger, if you use command po,

> po person

Result would be something like this,

▿ <name: Jack, addresses: Tampere Helsinki  0x7feb82f26e80>
  - name : "Jack"
  ▿ address1 : Address
    - city : "Helsinki"
  ▿ address2 : Address
    - city : "Tampere"

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In Swift 2.0 you can do this:

Basic version

print("Hello World")
result "Hello World\n"

Using terminator

print("Hello World", terminator:"")
result "Hello World"

Using separator

print("Hello", "World", separator:" ")
result "Hello World\n"

Using separator and terminator

print("Hello", "World", separator:" ", terminator:"")
result "Hello World"

Using one variable

var helloworld = "Hello World"
print(helloworld)
result "Hello World\n"

Using two variables

var hello = "Hello"
var world = "World"
print (hello, world)
result "Hello World\n"

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If you want same line in loop:

for i in 1...4
{
    print("", i, separator: " ", terminator:"")
}
print()

Output: 1 2 3 4

참고URL : https://stackoverflow.com/questions/30865233/print-without-newline-in-swift