iOS开发 自定义拖动视图

Simulator Screen Shot 2016年3月23日 上午11.02.35.png

DragSquaresView.gif

DragSquaresView.swift

import UIKit

class DragSquaresView: UIView {

    let itemArray = NSMutableArray()
    var contain:Bool!
    var startPoint: CGPoint!
    var originPoint: CGPoint!
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        createdView()
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    
   func createdView() {
    
    let W = UIScreen.mainScreen().bounds.width //屏幕宽度
    _ = UIScreen.mainScreen().bounds.height //屏幕高度
    
    let allView = 40 // 全部视图个数
    
    let mainViewW:CGFloat = W/4   //视图宽度
    let mainViewH:CGFloat = W/4 //视图高度
    let totalloc = 4 //列数
    
    let margin = (W - mainViewW * CGFloat(totalloc))/5 //边缘
    
    for i in 0..<allView {
        
        let loc = i%totalloc //列数
        let row = i/totalloc //行数(1/3=0,2/3=0,3/3=1）
        
        let viewX = margin + (margin + mainViewW) * CGFloat(loc)
        let viewY = margin + (margin + mainViewH) * CGFloat(row)
        
        //创建视图
        let btn = UIButton(frame: CGRect(x: viewX, y: viewY+20, width: mainViewW, height: mainViewH))
        btn.tag = i
        btn.titleLabel?.font = UIFont.systemFontOfSize(20)
        btn.backgroundColor = randonColor()
        btn.setTitle("\(i+1)", forState: .Normal)
        self.addSubview(btn)
        
        let longGesture = UILongPressGestureRecognizer(target: self, action: "buttonLongPressed:")
        btn.addGestureRecognizer(longGesture) //创建手势
        itemArray.addObject(btn)
        }
    }
    
    // 手势方法
    func buttonLongPressed(sender: UILongPressGestureRecognizer) {
        
        let btn = sender.view as! UIButton
        switch sender.state {
        case .Began:
            startPoint = sender.locationInView(sender.view)
            originPoint = btn.center
            
            UIView.animateWithDuration(0.2, animations: { () -> Void in
                btn.transform = CGAffineTransformMakeScale(1.1, 1.1)
                btn.alpha = 0.7
            })
        case .Changed:
            let newPoint = sender.locationInView(sender.view)
            let deltaX = newPoint.x - startPoint.x
            let deltaY = newPoint.y - startPoint.y
            btn.center = CGPoint(x: btn.center.x + deltaX, y: btn.center.y + deltaY)
            let index = indexOfPoint(btn.center, withButton: btn)
            if index < 0 {
                contain = false
            } else {
                
                UIView.animateWithDuration(0.2, animations: { () -> Void in
                    var temp = CGPointZero
                    let button = self.itemArray[index] as! UIButton
                    temp = button.center
                    button.center = self.originPoint
                    btn.center = temp
                    self.originPoint = btn.center
                    self.contain = true
                })
            }
        case .Ended:
            
            UIView.animateWithDuration(0.2, animations: { () -> Void in
                btn.transform = CGAffineTransformIdentity
                btn.alpha = 1.0
                if self.contain != nil {
                    btn.center = self.originPoint
                }
            })
        default:
            break
        }
    }
    
    func indexOfPoint(point: CGPoint, withButton btn: UIButton) -> Int {
        for i in 0..<itemArray.count {
            let button = itemArray[i] as! UIButton
            if button != btn {
                if CGRectContainsPoint(button.frame, point) {
                    return i
                }
            }
        }
        return -1
    }
    
    //随机颜色
    func randonColor() -> UIColor {
        
        let randomR:CGFloat = CGFloat(drand48())
        let randomG:CGFloat = CGFloat(drand48())
        let randomB:CGFloat = CGFloat(drand48())
        return UIColor(red: randomR, green: randomG, blue: randomB, alpha: 1.0)
    }
}

ViewController.swift

import UIKit

class ViewController: UIViewController {
    
    override func viewDidLoad() {
        super.viewDidLoad()

        //使用
        let dragView = DragSquaresView(frame: self.view.frame)
        self.view.addSubview(dragView)
    }  
}