session-ios/SignalMessaging/Views/OWSFlatButton.swift

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//
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// Copyright (c) 2018 Open Whisper Systems. All rights reserved.
//
import Foundation
import SignalServiceKit
@objc
public class OWSFlatButton: UIView {
let TAG = "[OWSFlatButton]"
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private let button: UIButton
private var pressedBlock : (() -> Void)?
private var upColor: UIColor?
private var downColor: UIColor?
override public var backgroundColor: UIColor? {
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willSet {
owsFail("Use setBackgroundColors(upColor:) instead.")
}
}
@objc
public init() {
AssertIsOnMainThread()
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button = UIButton(type:.custom)
super.init(frame:CGRect.zero)
createContent()
}
@available(*, unavailable, message:"use other constructor instead.")
required public init?(coder aDecoder: NSCoder) {
fatalError("\(#function) is unimplemented.")
}
private func createContent() {
self.addSubview(button)
button.addTarget(self, action:#selector(buttonPressed), for:.touchUpInside)
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button.autoPinToSuperviewEdges()
}
@objc
public class func button(title: String,
font: UIFont,
titleColor: UIColor,
backgroundColor: UIColor,
width: CGFloat,
height: CGFloat,
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target: Any,
selector: Selector) -> OWSFlatButton {
let button = OWSFlatButton()
button.setTitle(title:title,
font: font,
titleColor: titleColor )
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button.setBackgroundColors(upColor:backgroundColor)
button.useDefaultCornerRadius()
button.setSize(width:width, height:height)
button.addTarget(target:target, selector:selector)
return button
}
@objc
public class func button(title: String,
titleColor: UIColor,
backgroundColor: UIColor,
width: CGFloat,
height: CGFloat,
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target: Any,
selector: Selector) -> OWSFlatButton {
return OWSFlatButton.button(title:title,
font:fontForHeight(height),
titleColor:titleColor,
backgroundColor:backgroundColor,
width:width,
height:height,
target:target,
selector:selector)
}
@objc
public class func button(title: String,
font: UIFont,
titleColor: UIColor,
backgroundColor: UIColor,
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target: Any,
selector: Selector) -> OWSFlatButton {
let button = OWSFlatButton()
button.setTitle(title:title,
font: font,
titleColor: titleColor )
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button.setBackgroundColors(upColor:backgroundColor)
button.useDefaultCornerRadius()
button.addTarget(target:target, selector:selector)
return button
}
@objc
public class func fontForHeight(_ height: CGFloat) -> UIFont {
// Cap the "button height" at 40pt or button text can look
// excessively large.
let fontPointSize = round(min(40, height) * 0.45)
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return UIFont.ows_mediumFont(withSize:fontPointSize)
}
// MARK: Methods
@objc
public func setTitle(title: String, font: UIFont,
titleColor: UIColor ) {
button.setTitle(title, for: .normal)
button.setTitleColor(titleColor, for: .normal)
button.titleLabel!.font = font
}
@objc
public func setBackgroundColors(upColor: UIColor,
downColor: UIColor ) {
button.setBackgroundImage(UIImage(color:upColor), for: .normal)
button.setBackgroundImage(UIImage(color:downColor), for: .highlighted)
}
@objc
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public func setBackgroundColors(upColor: UIColor ) {
setBackgroundColors(upColor: upColor,
downColor: upColor.withAlphaComponent(0.7) )
}
@objc
public func setSize(width: CGFloat, height: CGFloat) {
button.autoSetDimension(.width, toSize:width)
button.autoSetDimension(.height, toSize:height)
}
@objc
public func useDefaultCornerRadius() {
// To my eye, this radius tends to look right regardless of button size
// (within reason) or device size.
button.layer.cornerRadius = 5
button.clipsToBounds = true
}
@objc
public func setEnabled(_ isEnabled: Bool) {
button.isEnabled = isEnabled
}
@objc
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public func addTarget(target: Any,
selector: Selector) {
button.addTarget(target, action:selector, for:.touchUpInside)
}
@objc
public func setPressedBlock(_ pressedBlock: @escaping () -> Void) {
guard self.pressedBlock == nil else {
owsFail("Button already has pressed block.")
return
}
self.pressedBlock = pressedBlock
}
@objc
internal func buttonPressed() {
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pressedBlock?()
}
}