UIButton 各种点击事件封装，事件响应区域修改，文字图片位置（垂直居中，水平居中）
import Foundation
import UIKit
// MARK: - 点击事件闭包与扩充点击范围
typealias BtnAction = (UIButton)->()
extension UIButton{
private struct AssociatedKeys{
static var actionKey = "actionKey"
}
@objc dynamic var action: BtnAction? {
set{
objc_setAssociatedObject(self,&AssociatedKeys.actionKey, newValue, objc_AssociationPolicy.OBJC_ASSOCIATION_COPY)
}
get{
if let action = objc_getAssociatedObject(self, &AssociatedKeys.actionKey) as? BtnAction{
return action
}
return nil
}
}
/// 添加一个点击事件
/// - Parameter action: 点击时执行的闭包
@discardableResult // 消除未使用返回值时的警告
func addClickAction(action:@escaping BtnAction) -> UIButton {
return self.addEvent(event: .touchUpInside, action: action)
}
/// 添加一个事件
/// - Parameters:
/// - event: 添加的事件
/// - action: 事件响应时执行的闭包
@discardableResult //消除未使用返回值时的警告
func addEvent(event:UIControl.Event, action:@escaping BtnAction ) -> UIButton{
self.action = action
self.addTarget(self, action: #selector(touchUpInSideBtnAction), for: event)
return self
}
@objc func touchUpInSideBtnAction(btn: UIButton) {
if let action = self.action {
action(btn)
}
}
@discardableResult //消除未使用返回值时的警告
func addCountdown(time:Int, endAction:@escaping ()->()) -> UIButton {
//倒计时时间
var timeout = time
let queue:DispatchQueue = DispatchQueue.global(qos: DispatchQoS.QoSClass.default)
let _timer:DispatchSource = DispatchSource.makeTimerSource(flags: [], queue: queue) as! DispatchSource
_timer.schedule(wallDeadline: DispatchWallTime.now(), repeating: .seconds(1))
//每秒执行
_timer.setEventHandler(handler: { () -> Void in
if(timeout<=0){ //倒计时结束，关闭
_timer.cancel();
DispatchQueue.main.sync(execute: { () -> Void in
self.isEnabled = true
endAction()
})
}else{//正在倒计时
let seconds = timeout
DispatchQueue.main.sync(execute: { () -> Void in
let str = String(describing: seconds)
let s = "秒"
self.titleLabel?.text = "\(str)\(s)"
self.setTitle("\(str)\(s)", for: .normal)
self.isEnabled = false
})
timeout -= 1;
}
})
_timer.resume()
return self
}
// 改进写法【推荐】
private struct RuntimeKey {
static let clickEdgeInsets = UnsafeRawPointer.init(bitPattern: "clickEdgeInsets".hashValue)
/// ...其他Key声明
}
/// 需要扩充的点击边距
public var addClickEdgeInsets: UIEdgeInsets? {
set {
objc_setAssociatedObject(self, UIButton.RuntimeKey.clickEdgeInsets!, newValue, objc_AssociationPolicy.OBJC_ASSOCIATION_COPY)
}
get {
return objc_getAssociatedObject(self, UIButton.RuntimeKey.clickEdgeInsets!) as? UIEdgeInsets ?? UIEdgeInsets.zero
}
}
// 重写系统方法修改点击区域
open override func point(inside point: CGPoint, with event: UIEvent?) -> Bool {
super.point(inside: point, with: event)
var bounds = self.bounds
if (addClickEdgeInsets != nil) {
let x: CGFloat = -(addClickEdgeInsets?.left ?? 0)
let y: CGFloat = -(addClickEdgeInsets?.top ?? 0)
let width: CGFloat = bounds.width + (addClickEdgeInsets?.left ?? 0) + (addClickEdgeInsets?.right ?? 0)
let height: CGFloat = bounds.height + (addClickEdgeInsets?.top ?? 0) + (addClickEdgeInsets?.bottom ?? 0)
bounds = CGRect(x: x, y: y, width: width, height: height) //负值是方法响应范围
}
return bounds.contains(point)
}
}
// MARK: - 图片文字位置
extension UIButton{
enum RGButtonImagePosition {
case top //图片在上，文字在下，垂直居中对齐
case bottom //图片在下，文字在上，垂直居中对齐
case left //图片在左，文字在右，水平居中对齐
case right //图片在右，文字在左，水平居中对齐
}
/// - Description 设置Button图片的位置
/// - Parameters:
/// - style: 图片位置
/// - spacing: 按钮图片与文字之间的间隔
func imagePosition(style: RGButtonImagePosition, spacing: CGFloat) {
//得到imageView和titleLabel的宽高
let imageWidth = self.imageView?.frame.size.width
let imageHeight = self.imageView?.frame.size.height
var labelWidth: CGFloat! = 0.0
var labelHeight: CGFloat! = 0.0
labelWidth = self.titleLabel?.intrinsicContentSize.width
labelHeight = self.titleLabel?.intrinsicContentSize.height
//初始化imageEdgeInsets和labelEdgeInsets
var imageEdgeInsets = UIEdgeInsets.zero
var labelEdgeInsets = UIEdgeInsets.zero
//根据style和space得到imageEdgeInsets和labelEdgeInsets的值
switch style {
case .top:
//上 左 下 右
imageEdgeInsets = UIEdgeInsets(top: -labelHeight-spacing/2, left: 0, bottom: 0, right: -labelWidth)
labelEdgeInsets = UIEdgeInsets(top: 0, left: -imageWidth!, bottom: -imageHeight!-spacing/2, right: 0)
break;
case .left:
imageEdgeInsets = UIEdgeInsets(top: 0, left: -spacing/2, bottom: 0, right: spacing)
labelEdgeInsets = UIEdgeInsets(top: 0, left: spacing/2, bottom: 0, right: -spacing/2)
break;
case .bottom:
imageEdgeInsets = UIEdgeInsets(top: 0, left: 0, bottom: -labelHeight!-spacing/2, right: -labelWidth)
labelEdgeInsets = UIEdgeInsets(top: -imageHeight!-spacing/2, left: -imageWidth!, bottom: 0, right: 0)
break;
case .right:
imageEdgeInsets = UIEdgeInsets(top: 0, left: labelWidth+spacing/2, bottom: 0, right: -labelWidth-spacing/2)
labelEdgeInsets = UIEdgeInsets(top: 0, left: -imageWidth!-spacing/2, bottom: 0, right: imageWidth!+spacing/2)
break;
}
self.titleEdgeInsets = labelEdgeInsets
self.imageEdgeInsets = imageEdgeInsets
}
}
// MARK: - 其他
extension UIButton {
/// 根据文字创建按钮
/// - Parameters:
/// - title: 文字
/// - font: 字体
/// - titleColor: 字体颜色
/// - Returns: 按钮
static func buildBtn(title: String, font: UIFont, titleColor: UIColor) -> UIButton {
let btn = UIButton(frame: .zero)
btn.backgroundColor = .clear
btn.setTitle(title, for: .normal)
btn.setTitleColor(titleColor, for: .normal)
btn.titleLabel?.font = font
let label = UILabel(frame: CGRect(x: 0, y: 0, width: 1000, height: 1000))
label.text = title
label.textColor = titleColor
label.font = font
label.sizeToFit()
// btn.addSubview(label)
btn.width = label.width
btn.height = label.height
return btn
}
}
demo参考：github
