UITextViewの右上にボタンをプログラムで直接追加することができません

Question

textviewは動的で、右上隅にボタンがあります。それはテキストフィールドのために働く。それはNSLayoutConstraintに対処するにはあまりにも複雑だ

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

....

が待ち...のTextViewでボタンが表示されません。代わりに、この単純なアンカーレイアウトコードを試してみてください。コード

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

適切な制約を与えるself.view.rightAnchor

働いていないのTextViewするrightAnchorを参照してくださいのこれらの単純な5行にself.addSubViewの下ですべてのものを交換してください黒い部分はtextViewで、橙色の部分はボタンです

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 
    }() 



}