[Swift]最强UIButton解析 | #selector()绑定点击事件

  1 //
  2 //  ViewController.swift
  3 //  demo
  4 //
  5 //  Created by qiang zeng on 2020/2/20.
  6 //  Copyright © 2020 strengthen All rights reserved.
  7 //
  8 
  9 import UIKit
 10 
 11 class ViewController: UIViewController {
 12     override func viewDidLoad() {
 13         super.viewDidLoad()
 14         //初始化一个按钮
 15         let button:UIButton = getButton()
 16         //将按钮添加到视图中
 17         self.view.addSubview(button)
 18         
 19         //设置按钮的点击事件：button.addTarget(Any?, action: Selector, for: UIControlEvents)
 20         //1、touchDown：单点触摸按下事件，点触屏幕
 21         //2、touchDownRepeat：多点触摸按下事件，点触计数大于1，按下第2、3或第4根手指的时候
 22         //3、touchDragInside：触摸在控件内拖动时
 23         //4、touchDragOutside：触摸在控件外拖动时
 24         //5、touchDragEnter：触摸从控件之外拖动到内部时
 25         //6、touchDragExit：触摸从控件内部拖动到外部时
 26         //7、touchUpInside：在控件之内触摸并抬起事件
 27         //8、touchUpOutside：在控件之外触摸抬起事件
 28         //9、touchCancel：触摸取消事件，即一次触摸因为放上太多手指而被取消，或者电话打断
 29         
 30         //按钮绑定点击事件,无参数传递方式1
 31         button.addTarget(self, action: #selector(buttonClick1), for: .touchUpInside)
 32         button.addTarget(self, action: #selector(buttonClick2), for: .touchUpInside)
 33         button.addTarget(self, action: #selector(buttonClick3), for: .touchUpInside)
 34         //按钮绑定点击事件,无参数传递方式2
 35         //Swift提倡用方式2
 36         button.addTarget(self, action: #selector(ViewController.buttonClick1), for: .touchUpInside)
 37         button.addTarget(self, action: #selector(ViewController.buttonClick2), for: .touchUpInside)
 38         button.addTarget(self, action: #selector(ViewController.buttonClick3), for: .touchUpInside)
 39         
 40         //按钮绑定点击事件,带button参数传递
 41         //与点击方法的参数相同，无参数标签使用参数名称，传递点击的按钮
 42         button.addTarget(self, action: #selector(buttonClick2(button:)), for: .touchUpInside)
 43         
 44         //与点击方法的参数相同，有参数标签使用参数标签
 45         button.addTarget(self, action: #selector(buttonClick3(_ :)), for: .touchUpInside)
 46     }
 47     
 48     //MARK:按钮点击1
 49     @objc func buttonClick1()
 50     {
 51         //TODO
 52     }
 53     
 54     //MARK:按钮点击2
 55     @objc func buttonClick2(button:UIButton)
 56     {
 57         //TODO
 58     }
 59     
 60     //MARK:按钮点击3
 61     @objc func buttonClick3(_ button:UIButton)
 62     {
 63         //TODO
 64     }
 65     
 66     //MARK:获取按钮
 67     func getButton() -> UIButton
 68     {
 69         //1、UIButtonType.system：前面不带图标，默认文字颜色为蓝色，有触摸时的高亮效果
 70         //2、UIButtonType.custom：定制按钮，前面不带图标，默认文字颜色为白色，无触摸时的高亮效果
 71         //3、UIButtonType.contactAdd：前面带“+”图标按钮，默认文字颜色为蓝色，有触摸时的高亮效果
 72         //4、UIButtonType.detailDisclosure：前面带“!”图标按钮，默认文字颜色为蓝色，有触摸时的高亮效果
 73         //5、UIButtonType.infoDark：为感叹号“!”圆形按钮
 74         //6、UIButtonType.infoLight：为感叹号“!”圆形按钮
 75         let button:UIButton = UIButton(type:.custom)
 76         
 77         //设置按钮的坐标和显示区域
 78         button.frame = CGRect(x:50, y:50, width:50,height: 50)
 79         //设置按钮的背景颜色
 80         button.backgroundColor = UIColor.red
 81         //设置按钮背景图片：button.setBackgroundImage(UIImage?, for: UIControlState)
 82         button.setBackgroundImage(UIImage(named:"bg"), for: .normal)
 83         //设置按钮字体和大小
 84         button.titleLabel?.font = UIFont.init(name:"Arial",size:16)
 85         //设置字体大小
 86         button.titleLabel?.font = UIFont.systemFont(ofSize: 22)
 87         //Tag
 88         button.tag = 1
 89         //高亮状态
 90         button.isHighlighted = true
 91         //设置镂空图片的颜色
 92         button.tintColor = UIColor.white
 93         //设置圆角
 94         button.layer.masksToBounds = true
 95         //圆角半径
 96         button.layer.cornerRadius = 10
 97         //边框粗细
 98         button.layer.borderWidth = 0.5
 99         //设置边框
100         button.layer.borderColor = UIColor.black.cgColor
101         
102         //设置按钮不同状态下的文字、颜色和阴影颜色
103         //1、UIControlState.normal//普通状态
104         //2、UIControlState.highlighted//触摸状态
105         //3、UIControlState.disabled//禁用状态
106         //设置各个状态的文字内容
107         button.setTitle("普通状态", for: .normal)
108         button.setTitle("触摸状态", for: .highlighted)
109         button.setTitle("禁用状态", for: .disabled)
110         //设置各个状态下文字阴影的颜色
111         button.setTitleShadowColor(UIColor.green, for:.normal)
112         button.setTitleShadowColor(UIColor.yellow, for:.highlighted)
113         button.setTitleShadowColor(UIColor.gray, for:.disabled)
114 
115         //设置按钮图标：button.setImage(UIImage?, for: UIControlState)
116         //当按钮类型为custom，处于highlighted和disable状态下图标会变暗，
117         //可以通过设置来禁用这种情况
118         button.setImage(UIImage(named:"img"), for: .normal)
119         button.adjustsImageWhenHighlighted = false //使触摸模式下按钮也不会变暗
120         button.adjustsImageWhenDisabled = false //使禁用模式下按钮也不会变暗
121         
122         //按钮文字太长处理方式：titleLabel 的 lineBreakMode 属性
123         //byTruncatingHead：省略头部文字，省略部分用...代替
124         //byTruncatingMiddle：省略中间部分文字，省略部分用...代替（默认）
125         //byTruncatingTail：省略尾部文字，省略部分用...代替
126         //byClipping：直接将多余的部分截断
127         //byWordWrapping：自动换行（按词拆分）
128         //byCharWrapping：自动换行（按字符拆分）
129         //注意：当设置自动换行后（byWordWrapping 或 byCharWrapping），我们可以在设置 title 时通过 \n 进行手动换行。
130         button.titleLabel?.lineBreakMode = .byWordWrapping
131 
132         //调整文字和图标之间的间距：通过图片偏移量（imageEdgeInsets）设置间距
133         button.imageEdgeInsets = UIEdgeInsets(top: 0, left: -10, bottom: 0, right: 0)
134         //通过文字偏移量（titleEdgeInsets）设置间距
135         button.titleEdgeInsets = UIEdgeInsets(top: 0, left: 10, bottom: 0, right: 0)
136         //调换或调整文字和图片位置：通过设置 titleEdgeInsets 和 imageEdgeInsets 即可实现。
137         let imageSize = button.imageRect(forContentRect: button.frame)//获取图标的CGRect
138         let titleFont = button.titleLabel?.font//获取字体
139         let titleSize = button.currentTitle!.size(withAttributes:[NSAttributedString.Key.font: titleFont!])//获取文字的尺寸
140         button.titleEdgeInsets = UIEdgeInsets(top: 0, left: -(imageSize.width * 2) , bottom: 0, right: 0)
141         button.imageEdgeInsets = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: -(titleSize.width * 2 + 10))
142         
143         //扩展方法示例：快速的设置图片和文字的相对位置，以及间距
144         button.set(icon: UIImage(named:"img"), title: "标题", titleLocation: .top, padding: 10, state: .normal)
145         return button
146     }
147 }
148 
149 //MARK:
150 extension UIButton{
151     func set(icon image: UIImage?, title: String, titleLocation: UIView.ContentMode, padding: CGFloat, state: UIControl.State ) {
152         self.imageView?.contentMode = .center
153         self.setImage(image, for: state)
154         relativeLocation(title: title, location: titleLocation, padding: padding)
155         self.titleLabel?.contentMode = .center
156         self.setTitle(title, for: state)
157     }
158     
159     private func relativeLocation(title: String, location: UIView.ContentMode, padding: CGFloat){
160         let imageSize = self.imageRect(forContentRect: self.frame)
161         let titleFont = self.titleLabel?.font!
162         let titleSize = title.size(withAttributes: [NSAttributedString.Key.font : titleFont!])
163         
164         var titleInsets: UIEdgeInsets
165         var imageInsets: UIEdgeInsets
166         
167         switch location {
168         case .top:
169             titleInsets = UIEdgeInsets(top: -(imageSize.height + titleSize.height + padding),
170                                        left: -(imageSize.width), bottom: 0, right: 0)
171             imageInsets = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: -titleSize.width)
172         case .left:
173             titleInsets = UIEdgeInsets(top: 0, left: -(imageSize.width * 2), bottom: 0, right: 0)
174             imageInsets = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: -(titleSize.width * 2 + padding))
175         case .bottom:
176             titleInsets = UIEdgeInsets(top: (imageSize.height + titleSize.height + padding),
177                                        left: -(imageSize.width), bottom: 0, right: 0)
178             imageInsets = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: -titleSize.width)
179         case .right:
180             titleInsets = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: -padding)
181             imageInsets = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
182         default:
183             titleInsets = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
184             imageInsets = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
185         }
186         self.titleEdgeInsets = titleInsets
187         self.imageEdgeInsets = imageInsets
188     }
189 }