微信输入框的粘贴图片--Swift

废话不多说，其实也是相当于给UITextField，UITextView添加自定义的系统弹出菜单。
那第一当然是先添加一个UIMenuItem

let pasteboard = UIPasteboard.generalPasteboard()
        
        if pasteboard.image != nil {
            let menuController = UIMenuController.sharedMenuController()
            let pasteMenuItem = UIMenuItem.init(title: "粘贴", action: "pasteImage")
            menuController.menuItems = [pasteMenuItem]
            menuController.menuVisible = true
        }

然后在程序里加入下面这个方法，这个方法主要用来出来那些动作是被响应的，比如说：copy，cut，paste以及自定义的一些响应方法等等，有兴趣的可以在自己的工程里试试，返回YES表示响应对应的操作，返回NO则表示不响应：(其实这里不写也是行的)

override func canPerformAction(action: Selector, withSender sender: AnyObject?) -> Bool {
        if action == "pasteImage" {
            return true
        }
        return false
    }

在然后就是显示图片咯

func pasteImage() {
let pasteboard = UIPasteboard.generalPasteboard()
            self.pasteImageView = UIImageView.init(image: pasteboard.image)
            
            UIApplication.sharedApplication().keyWindow?.addSubview(self.pasteImageView)
            self.pasteImageView.center = self.view.center
            self.pasteImageView.bounds = CGRectMake(0, 0, self.view.frame.size.width-30, (self.view.frame.size.width-30)*(pasteboard.image?.size.height)!/(pasteboard.image?.size.width)!)
            self.pasteImageView.transform = CGAffineTransformMakeTranslation(0, self.view.frame.size.height)
            
            UIView.animateWithDuration(1, delay: 0.0, usingSpringWithDamping: 0.8, initialSpringVelocity: 1, options: .CurveEaseInOut, animations: { () -> Void in
                self.pasteImageView.transform = CGAffineTransformMakeTranslation(0, 0)
                }, completion: nil)
    self.view.endEditing(true)
    }

效果图

image

源码demo