在uitextfield中添加图标-iOS Swift

Question

I'm trying to add icon in textfield. This is how my UI looks now with code below

Im expecting my UI should look similar to this image

// creating view (holderView) to hold icon image(image) and add view to textField (txtEmail)

    let holderView = UIView(frame: CGRect(x:0, y:0, width: 40, height: 40))

    let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 20, height: 20))

    let image = UIImage(named: "ic_lock_48pt")

    imageView.image = image

    holderView.backgroundColor = UIColor.lightGray

    holderView.addSubview(imageView)

    imageView.center = CGPoint(x: holderView.frame.size.width / 2, y: holderView.frame.size.height / 2)

    txtEmail.leftView = holderView

( If im doing long process to fix this please let me know )

so I wanted to add constraints programatically to fix and below is the code

    holderView.translatesAutoresizingMaskIntoConstraints = false

    let leadingConstraint = NSLayoutConstraint(item: holderView, attribute: .leading, relatedBy: .equal, toItem: emailView, attribute: .leading, multiplier: 1, constant: 0)

    let trailingConstraint = NSLayoutConstraint(item: holderView, attribute: .trailing, relatedBy: .equal, toItem: emailView, attribute: .trailing, multiplier: 0.12, constant: 0)

    let topConstraint = NSLayoutConstraint(item: holderView, attribute: .top, relatedBy: .equal, toItem: emailView, attribute: .top, multiplier: 1, constant: 0)

    let bottomConstraint = NSLayoutConstraint(item: holderView, attribute: .bottom, relatedBy: .equal, toItem: emailView, attribute: .bottom, multiplier: 1, constant: 0)

//I have txtEmail in another view (emailView) //Error while running any of two lines of code below

    emailView.addConstraints([leadingConstraint, trailingConstraint, topConstraint, bottomConstraint]) //or
   txtEmail.addConstraints([leadingConstraint, trailingConstraint, topConstraint, bottomConstraint])

Kindly suugest me how to fix this

Answer 1

Try his code:

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    textfield.leftViewMode = UITextFieldViewMode.always
    let imageView = UIImageView(frame: CGRect(x: -1, y: 0, width: 30, height: 40))
    let image = UIImage(named: "q.png")
    imageView.backgroundColor = UIColor(white: 0.7, alpha: 0.6)
    imageView.image = image
    textfield.leftView = imageView

    textfield.layer.borderColor = UIColor(white: 0.7, alpha: 0.6).cgColor
    textfield.layer.borderWidth = 2

    imageView.layer.borderColor = UIColor(white: 0.7, alpha: 0.6).cgColor
    imageView.layer.borderWidth = 2

    textfield.layer.cornerRadius = 5
    textfield.layer.masksToBounds = true

 }

Note: You have to create an icon image similar to below image to achieve the effect.Its all about creating an icon and place it in a right position.hope this helps..

Output: