Nicht möglich, Schaltfläche oben rechts in UITextView programmgesteuert in Swift

Question

die Textansicht ist dynamisch, die eine Schaltfläche in der oberen rechten Ecke enthält. es funktioniert für Textfeld. nicht Schaltfläche in Textview zeigt ..

Warten ....

class CommonTextView: UITextView { 

private let microphoneButton = UIButton(type: .System) 

required init?(coder aDecoder: NSCoder) { 
    super.init(coder: aDecoder) 

    initTextView() 
} 

func initTextView() -> Void { 

    self.layer.cornerRadius = 7 

    microphoneButton.translatesAutoresizingMaskIntoConstraints = false 
    //microphoneButton.backgroundColor = UIColor.lightGrayColor().colorWithAlphaComponent(0.3) 
    microphoneButton.setImage(UIImage(named: "mic"), forState: .Normal) 
    microphoneButton.tintColor = UIColor.darkGrayColor() 
    microphoneButton.addTarget(self, action: #selector(self.microphonePressed), forControlEvents: .TouchUpInside) 
    self.addSubview(microphoneButton) 

    let trailingConstraint = NSLayoutConstraint(item: microphoneButton, attribute: .Trailing, relatedBy: .Equal, toItem: self, attribute: .Trailing, multiplier: 1, constant: 0) 
    let topConstraint = NSLayoutConstraint(item: microphoneButton, attribute: .Top, relatedBy: .Equal, toItem: self, attribute: .Top, multiplier: 1, constant: 0) 
    let widthConstraint = NSLayoutConstraint(item: microphoneButton, attribute: .Width, relatedBy: .Equal, toItem: nil, attribute: .NotAnAttribute, multiplier: 1, constant: 40) 
    let heightConstraint = NSLayoutConstraint(item: microphoneButton, attribute: .Height, relatedBy: .Equal, toItem: nil, attribute: .NotAnAttribute, multiplier: 1, constant: 40) 
    self.addConstraints([trailingConstraint, topConstraint, widthConstraint, heightConstraint]) 

} 

Answer 1

Es ist zu kompliziert mit NSLayoutConstraint zu beschäftigen. Versuchen Sie stattdessen diesen einfachen Anchor-Layout-Code. Ersetzen Sie alles unter self.addSubView diesen einfachen fünf Zeilen Code

let margins = view.layoutMarginsGuide 
microphoneButton.trailingAnchor.constraint(equalTo: margins.trailingAnchor, constant: 0).isActive = true 
microphoneButton.topAnchor.constraint(equalTo: margins.topAnchor, constant: 100).isActive = true 
microphoneButton.widthAnchor.constraint(equalToConstant: 100).isActive = true 
microphoneButton.heightAnchor.constraint(equalToConstant: 30).isActive = true 

Answer 2

für die richtigen Constraints Siehe rightAnchor arbeiten Textview nicht geben ihm self.view.rightAnchor

Das schwarze Teil ist textView und das orange Teil ist Button

import UIKit 

class ViewController: UIViewController { 


    override func viewDidLoad() { 
     super.viewDidLoad() 
     // Do any additional setup after loading the view, typically from a nib. 
     view.addSubview(textView) 
     textView.leftAnchor.constraint(equalTo: view.leftAnchor).isActive = true 
     textView.rightAnchor.constraint(equalTo: view.rightAnchor).isActive = true 
     textView.heightAnchor.constraint(equalToConstant: 200).isActive = true 
     textView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true 


     textView.addSubview(button) 


     button.heightAnchor.constraint(equalToConstant: 50).isActive = true 
     button.widthAnchor.constraint(equalToConstant: 100).isActive = true 
     button.topAnchor.constraint(equalTo: textView.topAnchor).isActive = true 
     **button.rightAnchor.constraint(equalTo: view.rightAnchor).isActive = true** 
     view.bringSubview(toFront: button) 

    } 

    override func didReceiveMemoryWarning() { 
     super.didReceiveMemoryWarning() 
     // Dispose of any resources that can be recreated. 
    } 

    let textView: UITextView = { 
     let label = UITextView() 
     // label.text = "Jeevan Chandra Tiwari" 
     label.backgroundColor = .black 
     label.textColor = .white 
     label.translatesAutoresizingMaskIntoConstraints = false 
     return label 
    }() 

    let button: UIButton = { 
     let button = UIButton(type: .system) 
     button.backgroundColor = .orange 
     button.setTitle("Click Me", for: .normal) 
     button.translatesAutoresizingMaskIntoConstraints = false 
     return button 
    }() 



}