71 lines
3.0 KiB
Swift
71 lines
3.0 KiB
Swift
import UIKit
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public final class TextView : UITextView, UITextViewDelegate {
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private let usesDefaultHeight: Bool
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private let height: CGFloat
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private let horizontalInset: CGFloat
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private let verticalInset: CGFloat
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private let placeholder: String
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public override var contentSize: CGSize { didSet { centerTextVertically() } }
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private lazy var placeholderLabel: UILabel = {
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let result = UILabel()
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result.font = .systemFont(ofSize: Values.smallFontSize)
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result.textColor = Colors.text.withAlphaComponent(Values.mediumOpacity)
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return result
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}()
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public init(placeholder: String, usesDefaultHeight: Bool = true, customHeight: CGFloat? = nil, customHorizontalInset: CGFloat? = nil, customVerticalInset: CGFloat? = nil) {
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self.usesDefaultHeight = usesDefaultHeight
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self.height = customHeight ?? TextField.height
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self.horizontalInset = customHorizontalInset ?? (isIPhone5OrSmaller ? Values.mediumSpacing : Values.largeSpacing)
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self.verticalInset = customVerticalInset ?? (isIPhone5OrSmaller ? Values.smallSpacing : Values.largeSpacing)
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self.placeholder = placeholder
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super.init(frame: CGRect.zero, textContainer: nil)
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self.delegate = self
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setUpStyle()
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}
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public override init(frame: CGRect, textContainer: NSTextContainer?) {
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preconditionFailure("Use init(placeholder:) instead.")
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}
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public required init?(coder: NSCoder) {
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preconditionFailure("Use init(placeholder:) instead.")
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}
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private func setUpStyle() {
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showsHorizontalScrollIndicator = false
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showsVerticalScrollIndicator = false
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placeholderLabel.text = placeholder
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backgroundColor = .clear
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textColor = Colors.text
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font = .systemFont(ofSize: Values.smallFontSize)
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tintColor = Colors.accent
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keyboardAppearance = isLightMode ? .light : .dark
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if usesDefaultHeight {
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set(.height, to: height)
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}
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layer.borderColor = isLightMode ? Colors.text.cgColor : Colors.border.withAlphaComponent(Values.lowOpacity).cgColor
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layer.borderWidth = 1
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layer.cornerRadius = TextField.cornerRadius
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let horizontalInset = usesDefaultHeight ? self.horizontalInset : Values.mediumSpacing
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textContainerInset = UIEdgeInsets(top: 0, left: horizontalInset, bottom: 0, right: horizontalInset)
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addSubview(placeholderLabel)
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placeholderLabel.pin(.leading, to: .leading, of: self, withInset: horizontalInset + 3) // Slight visual adjustment
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placeholderLabel.pin(.top, to: .top, of: self)
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pin(.trailing, to: .trailing, of: placeholderLabel, withInset: horizontalInset)
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pin(.bottom, to: .bottom, of: placeholderLabel)
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}
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public func textViewDidChange(_ textView: UITextView) {
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placeholderLabel.isHidden = !text.isEmpty
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}
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private func centerTextVertically() {
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let topInset = max(0, (bounds.size.height - contentSize.height * zoomScale) / 2)
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contentInset = UIEdgeInsets(top: topInset, left: 0, bottom: 0, right: 0)
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}
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}
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