模仿网易新闻客户端的滚动菜单

模仿网易新闻客户端的滚动菜单，点击菜单的时候有放大标题的动画效果。demo地址：https://github.com/BigHub/ScrollMenuViewTest

需要用到facebook的开源动画引擎pop 实现代码：

JWSegmentMenuView.swift

  1 //
  2 //  JWSegmentMenuView.swift
  3 //  ScrollMenuViewTest
  4 //
  5 //  Created by jianwei on 15/8/11.
  6 //  Copyright (c) 2015年 Jianwei. All rights reserved.
  7 //
  8
  9 import UIKit
 10
 11 @objc protocol JWSegmentMenuViewDelegate{
 12    optional func selectItem(index:Int);
 13 }
 14
 15 class JWSegmentMenuView: UIScrollView {
 16     //MARK: - 代理
 17     weak var segmentMenuViewDelegate:JWSegmentMenuViewDelegate?
 18
 19     //MARK: 选中的item
 20     var seletedItem:JWSegmentMenuItem?{
 21         didSet{
 22
 23             var scaleAnimation = POPBasicAnimation(propertyNamed: kPOPViewScaleXY)
 24             scaleAnimation.duration = 0.2
 25             scaleAnimation.toValue = NSValue(CGPoint: CGPointMake(1.0, 1.0))
 26             oldValue?.pop_addAnimation(scaleAnimation, forKey: "scaleAnimation")
 27             oldValue?.selected = false
 28             oldValue?.showBorderLine = false
 29
 30             var scaleAnimation2 = POPBasicAnimation(propertyNamed: kPOPViewScaleXY)
 31             scaleAnimation2.duration = 0.2
 32             scaleAnimation2.toValue = NSValue(CGPoint: CGPointMake(1.3, 1.3 ))
 33             seletedItem?.pop_addAnimation(scaleAnimation2, forKey: "scaleAnimation2")
 34             seletedItem?.selected = true
 35             seletedItem?.showBorderLine = true
 36
 37             let index = (self.subviews as NSArray).indexOfObject(seletedItem!)
 38             let previousIndex = index-1
 39             let nextIndex = index + 1
 40
 41             var visibleRect:CGRect?
 42             if previousIndex >= 0 && nextIndex < titlesArray!.count {
 43                 var preItem = self.subviews[previousIndex] as! JWSegmentMenuItem
 44                 var nextItem = self.subviews[nextIndex] as! JWSegmentMenuItem
 45                 visibleRect = CGRectMake(preItem.frame.origin.x, preItem.frame.origin.y, preItem.frame.size.width + nextItem.frame.size.width + seletedItem!.frame.size.width, preItem.frame.size.height)
 46             }else if previousIndex < 0 || nextIndex >= titlesArray?.count {
 47                 visibleRect = seletedItem!.frame
 48             }
 49
 50             self.scrollRectToVisible(visibleRect!, animated: true)
 51         }
 52     }
 53
 54     //MARK: 菜单名称列表
 55     var titlesArray:NSArray?{
 56         didSet{
 57
 58             if oldValue?.count > 0 {
 59                 (self.subviews as NSArray).enumerateObjectsUsingBlock({ (obj:AnyObject!, index:Int, stop:UnsafeMutablePointer<ObjCBool>) -> Void in
 60                     (obj as! UIButton).removeFromSuperview()
 61                 })
 62             }
 63
 64             if let titles = titlesArray {
 65                 var x:CGFloat = 0
 66                 titles.enumerateObjectsUsingBlock({ (obj:AnyObject!, index:Int, stop:UnsafeMutablePointer<ObjCBool>) -> Void in
 67                     var button:JWSegmentMenuItem = JWSegmentMenuItem.buttonWithType(UIButtonType.Custom) as! JWSegmentMenuItem
 68                     button.titleLabel?.font = UIFont.boldSystemFontOfSize(16)
 69                     print(button.titleLabel!.frame)
 70                     button.titleLabel?.frame = button.bounds
 71                     print(button.titleLabel!.frame)
 72                     button.setTitle(obj as? String, forState: UIControlState.Normal)
 73                     button.setTitleColor(self.menuTitleColor, forState: UIControlState.Normal)
 74                     button.setTitleColor(self.menuTitleTintColor, forState: UIControlState.Selected)
 75                     button.addTarget(self, action: "selectItem:", forControlEvents: UIControlEvents.TouchUpInside)
 76                     var str = NSString(string: obj as! String)
 77                     var size = str.sizeWithAttributes([NSFontAttributeName:UIFont(name: button.titleLabel!.font.fontName, size: button.titleLabel!.font.pointSize)!])
 78                     size.width += 20
 79                     size.height = self.frame.size.height
 80                     button.frame = CGRectMake(x, 0.0 as CGFloat, size.width, size.height)
 81                     x += size.width
 82                     self.addSubview(button)
 83                 })
 84                 self.contentSize = CGSizeMake(x, self.frame.size.height)
 85             }
 86         }
 87     }
 88
 89     //MARK: 菜单背景色
 90     var menuBackgroundColor:UIColor = UIColor(red: 172/255.0, green: 220/255.0, blue: 30/255.0, alpha: 1)
 91     {
 92         didSet{
 93             self.backgroundColor = menuBackgroundColor
 94         }
 95     }
 96
 97     //MARK: 菜单名称字体颜色
 98     var menuTitleColor:UIColor?
 99     {
100         didSet{
101             for item in self.subviews {
102                 if item is JWSegmentMenuItem {
103                     (item as! JWSegmentMenuItem).setTitleColor(menuTitleColor, forState: UIControlState.Normal)
104                 }
105             }
106         }
107     }
108
109     //MARK: 菜单被选中时的名称字体颜色
110     var menuTitleTintColor:UIColor?
111     {
112         didSet{
113             for item in self.subviews {
114                 if item is JWSegmentMenuItem {
115                     (item as! JWSegmentMenuItem).setTitleColor(menuTitleTintColor, forState: UIControlState.Selected)
116                 }
117             }
118
119         }
120     }
121
122     //MARK: 菜单背景的下划线颜色
123     var menuBackgroundUnderlineColor:UIColor = UIColor.lightGrayColor()
124     {
125         didSet{
126             self.setNeedsDisplay()
127         }
128     }
129
130
131     override init(frame:CGRect){
132         super.init(frame: frame)
133         self.showsHorizontalScrollIndicator = false
134         self.showsVerticalScrollIndicator = false
135         self.backgroundColor = menuBackgroundColor
136         menuTitleTintColor = UIColor.redColor()
137         menuTitleColor = UIColor.whiteColor()
138     }
139
140     required init(coder aDecoder: NSCoder) {
141         fatalError("init(coder:) has not been implemented")
142     }
143
144 //    override func drawRect(rect: CGRect) {
145 //        let underLinePath = UIBezierPath()
146 //        underLinePath.moveToPoint(CGPointMake(0, self.frame.size.height))
147 //        underLinePath.addLineToPoint(CGPointMake(self.frame.size.width, self.frame.size.height))
148 //        underLinePath.lineWidth = 4
149 //        menuBackgroundUnderlineColor.set()
150 //        underLinePath.stroke()
151 //    }
152
153     //MARK: - 选中item触发的方法
154     func selectItem(item:JWSegmentMenuItem){
155         seletedItem = item
156         segmentMenuViewDelegate?.selectItem!((self.subviews as NSArray).indexOfObject(seletedItem!))
157     }
158
159 }
160
161 class JWSegmentMenuItem: UIButton {
162     //MARK: 是否显示菜单item的下划线
163     var showBorderLine:Bool = false {
164         didSet{
165             self.setNeedsDisplay()
166         }
167     }
168
169 //    override func drawRect(rect: CGRect) {
170 //        if showBorderLine {
171 //            let path = UIBezierPath();
172 //            path.moveToPoint(CGPointMake(0, self.frame.height))
173 //            path.addLineToPoint(CGPointMake(self.frame.width, self.frame.height))
174 //            path.lineWidth = 6
175 //            titleColorForState(UIControlState.Selected)?.set()
176 //            path.stroke()
177 //        }
178 //    }
179
180 }

使用：

ViewController.swift

//
//  ViewController.swift
//  ScrollMenuViewTest
//
//  Created by jianwei on 15/8/10.
//  Copyright (c) 2015年 Jianwei. All rights reserved.
//

import UIKitclass ViewController: UIViewController,JWSegmentMenuViewDelegate {@IBOutlet weak var textLabel: UILabel!var segmentView:JWSegmentMenuView?lazy var titlesArray:[String] = {return ["按钮一","按钮二","按钮","按钮四","按钮五","按钮六","按钮七","按钮八","按钮九","按钮十","按钮十一","按钮十二","按钮十三"]}()override func viewDidLoad() {super.viewDidLoad()segmentView = JWSegmentMenuView(frame: CGRectMake(0, 20, self.view.frame.size.width, 33))segmentView?.titlesArray = titlesArraysegmentView?.segmentMenuViewDelegate = selfself.view.addSubview(segmentView!)}//MARK: - JWSegmentMenuViewDelegate
    func selectItem(index: Int) {textLabel.text = titlesArray[index]}
}

转载于:https://www.cnblogs.com/mysticode/p/4723483.html

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