如何在特定点停止 NSTimer? [英] How to stop NSTimer at a specific point?

问题描述

我创建了一个简单的按钮游戏，每次点击按钮都会为用户提供一个点.该按钮每 1.5 秒随机出现在屏幕上.我希望游戏在 30 秒或 20 个随机按钮弹出后结束.我一直在使用下面的代码让按钮在屏幕上随机弹出:

I've created a simple button game that gives the user a point with every tap of the button. The button randomly appears on screen every 1.5 seconds. I want the game to end after 30 seconds or after 20 random button pop ups. I've been using the code below to have the button randomly pop-up on the screen:

timer = [NSTimer scheduledTimerWithTimeInterval: 1.5 target:self
         selector:@selector(moveButton:) 
         userInfo:nil 
         repeats:YES];

我已经在头文件中声明了定时器:

I've declared the timer in the header file:

NSTimer *timer;
@property (nonatomic, retain) NSTimer *timer;

我在 使用计时器 但未能完全理解它.我想也许我可以使用:

I've read Apple Docs on Using Timers but fail to fully understand it. I thought maybe I could use:

- (void)countedTimerFireMethod:(NSTimer *)timer{
  count ++;
  if(count > 20){
     [self.timer invalidate];
     self.timer = nil;

但是它不能正常工作.我究竟做错了什么?我是 Objective-C 的新手，所以我不太熟悉它的工作原理.

But it does not work properly. What am I doing wrong? I'm new to objective-C so I'm not that familiar with how things work.

推荐答案

问题出在您的计时器方法上，您正在传递 moveButton 方法，但在下面的方法中，您正在停止计时器的方法名称不同，因此请尝试以下操作:-

The problem is on your timer method you are passing moveButton method but in below method where you are stopping the timer that method name is different so try this:-

  self.timer = [NSTimer     
  scheduledTimerWithTimeInterval: 1.5 target:self
     selector:@selector(moveButton:) 
     userInfo:nil 
     repeats:YES];

//只需更改下面的方法名称

//just change the method name below

 - (void)moveButton:(NSTimer *)timer{
  count ++;
  if(count > 20){
    [self.timer invalidate];
    self.timer = nil;}

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