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[英]How to get input from user using Swift in playground project in Xcode 8.2?
[英]how to get input from user using swift in playground project in xcode 9.2
這給ios11一個錯誤,知道嗎!?
來自主題:如何在Xcode 8.2的Playground項目中使用Swift獲得用戶輸入
import UIKit
import PlaygroundSupport
// new code user input
class V: UIViewController {
var textField = UITextField(frame: CGRect(x: 20, y: 20, width: 200, height: 24))
override func viewDidLoad() {
super.viewDidLoad()
//view.addSubview(textField)
textField.backgroundColor = .white
textField.delegate = self
}
}
extension V: UITextFieldDelegate {
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
// Do stuff here
print("Please enter your name")
var name = readLine()
print("name: \(name!)")
return true
}
}
let v = V()
v.view.frame = CGRect(x: 0, y: 0, width: 300, height: 300)
PlaygroundPage.current.liveView = v.view
PlaygroundPage.current.needsIndefiniteExecution = true
您不能在快速的操場上使用readline()
。 為此,您必須使用命令行工具。
另外,您的代碼僅顯示黑色;)..我對其進行了修改,因此您可以看到一個文本字段:
import UIKit
import PlaygroundSupport
// new code user input
class V: UIViewController {
var textField: UITextField!
override func loadView() {
//super.viewDidLoad()
//view.addSubview(textField)
let view = UIView()
view.backgroundColor = .white
textField = UITextField()
textField.backgroundColor = .white
textField.delegate = self
textField.borderStyle = .roundedRect
view.addSubview(textField)
textField.text = "Hello world!"
// Layout
textField.translatesAutoresizingMaskIntoConstraints = false
let margins = view.layoutMarginsGuide
NSLayoutConstraint.activate([
textField.topAnchor.constraint(equalTo: margins.topAnchor, constant: 20),
textField.leadingAnchor.constraint(equalTo: margins.leadingAnchor),
textField.trailingAnchor.constraint(equalTo: margins.trailingAnchor),
])
self.view = view
}
}
extension V: UITextFieldDelegate {
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
// Do stuff here
print("Please enter your name")
var name = readLine()
print("name: \(name!)")
return true
}
}
let v = V()
//v.view.frame = CGRect(x: 0, y: 0, width: 300, height: 300)
PlaygroundPage.current.liveView = v
//PlaygroundPage.current.needsIndefiniteExecution = true
一個很好且更完整的示例可以在這里找到: https : //www.ralfebert.de/ios-examples/uikit/uicatalog-playground/UITextField/
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