getcoin.lua

local composer = require("composer")

local scene = composer.newScene()
local physics = require("physics")
physics.start()
function scene:create(event)
    local player = display.newImageRect("images/bomb.png", 50, 50)
    physics.addBody(player, "static")
    player.x = display.contentCenterX
    player.y = 400
    local screenWidth = display.contentWidth

    local line = display.newRect(0, 0, screenWidth * 2, 2)
    line.y = 500
    line:setFillColor(0, 0, 0)
    physics.addBody(line, "static")
end

function scene:show(event)
    local sceneGroup = self.view
    local phase = event.phase

    if (phase == "will") then
        local speed = 2
        local touch_x
        local score = 0
        local on_touch
        local scoreText = display.newText("Score: 0", display.contentCenterX, 10, native.systemFont, 20)

        local function updateScore()
            scoreText.text = "Score: " .. score
        end

        local move = function()
            local target_x = player.x
            if touch_x > player.x then
                target_x = math.min(touch_x, player.x + 10)
            elseif touch_x < player.x then
                target_x = math.max(touch_x, player.x - 10)
            end

            if target_x ~= player.x then
                transition.to(player,
                    { x = target_x, time = math.abs(target_x - player.x) / speed, onComplete = on_touch })
            end
        end

        on_touch = function(event)
            if event.phase == "began" then
                touch_x = event.x
                move()
                return true
            elseif event.phase == "moved" then
                touch_x = event.x
                move()
            elseif event.phase == "ended" then
                touch_x = player.x
                move()
            else
                move()
            end
        end

        local min_x = 40
        local max_x = 300
        local min_delay = 0.3
        local max_delay = 1.02
        local coin = {}


        local generateCoin

        generateCoin = function()
            local x = math.random(min_x, max_x)
            local y = 100

            local coin = display.newImageRect("images/coin.png", 50, 50)
            coin.x = x
            coin.y = y
            physics.addBody(coin)
            local drop_time = 4000
            local drop_distance = 1000

            transition.to(coin, { y = display.contentHeight, time = drop_time }) --,onComplete = function() coin:removeSelf() end})
        end

        Runtime:addEventListener("touch", on_touch)

        local timeLeft = 10
        local function updateTimer()
            timeLeft = timeLeft - 1
            print(timeLeft)
            if timeLeft == 0 then
                print("结束")
                scene:hide()
                return
            else
                generateCoin()
            end
        end

        local timerID = timer.performWithDelay(1000, updateTimer, timeLeft)

        local function touchcoin(event)
            if (event.phase == "began") then
                if (event.object1 == player) then
                    event.object2:removeSelf()
                    print("collision!")
                    score = score + 1
                    print("score:" .. score)
                    updateScore()
                elseif (event.object2 == player) then
                    event.object1:removeSelf()
                    print("collision!")
                    score = score + 1
                    print("score:" .. score)
                    updateScore()
                elseif (event.object1 == line) then
                    event.object2:removeSelf()
                    print("lost")
                elseif (event.object2 == line) then
                    event.object1:removeSelf()
                    print("lost")
                end
            end
        end
        Runtime:addEventListener("collision", touchcoin)
    end
end

function scene:hide( event )
 
    local sceneGroup = self.view
    local phase = event.phase
 
    if ( phase == "will" ) then
       display.removeSelf(player)

 
    end
end

scene:addEventListener( "create", scene )
scene:addEventListener( "show", scene )
scene:addEventListener( "hide", scene )

return scene