如何使用 NSTimer

发布于 2024-09-13 16:28:40 字数 652 浏览 3 评论 0原文

我在我的应用程序中使用了很多计时器。用于记录时间、移动物体、淡入淡出等。我在不同时间、同一视图中使用相同的计时器来实现多个目的。我应该如何正确声明和无效或释放我的计时器？

Atm 我这样声明计时器：

fadeTimer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(bortInfo) userInfo:nil repeats:YES];

一旦我不使用它，我就会这样做：

[fadeTimer invalidate]; 
fadeTimer = nil;

当我离开视图时，每个计时器上的保留计数都是 0。我也应该在释放中释放计时器吗？我的应用程序运行得很好，但有时会崩溃。

我用于更新时间标签的时钟计时器

[[NSRunLoop mainRunLoop] addTimer:clockTimer forMode:NSRunLoopCommonModes];

一旦使时钟计时器无效，我是否需要对此 mainLoop 执行任何操作？

总而言之，请支持我提供一些有关使用计时器的信息。

非常感谢！

乔金

原文

Im using alot of timers in my application. For recording time, moving object, fading etc. I use the same timer for several puposes in the same view at different times. How should I declare and invalidate or release my timers properly?

Atm Im declaring the timers like this:

fadeTimer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(bortInfo) userInfo:nil repeats:YES];

and as soon as im not using it im doing this:

[fadeTimer invalidate]; 
fadeTimer = nil;

The retain count when im leaving the view is 0 on every timer. Should i release the timer in the dealloc aswell? My app runs quite good, but from time to time it crashes.

The clockTimer that i use for updating a label with the time uses

[[NSRunLoop mainRunLoop] addTimer:clockTimer forMode:NSRunLoopCommonModes];

Do i need to do anything with this mainLoop once i invalidate the clockTimer?

All in all please support me with some info about working with timers.

Thank you very much!

Joakim

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溺孤伤于心 2024-09-20 16:28:40

您没有正确保留计时器 - 如果您想再次引用它们，您应该保留它们。我会使用头文件中的属性（即）来执行此操作

@property (nonatomic, retain) NSTimer *fadeTimer;

，并将代码更改为

self.fadeTimer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(bortInfo) userInfo:nil repeats:YES];

// Put this whenever you want to remove your timer and in your dealloc method.
[fadeTimer invalidate];
self.fadeTimer = nil;

“这将确保您的计时器由您的对象保留”。否则，您只能希望计时器保持不变并且不会被 iPhone 自动释放。正如你所说，它偶尔会崩溃，这可能就是原因；）

恐怕我对运行循环了解不多，但很困惑为什么你不只使用普通的 NSTimer 来安排事情 - 为什么要费心与运行循环交互呢？

You're not retaining your timers properly - if you want to refer to them again you should retain them. I'd do this with a property i.e. in your header file

@property (nonatomic, retain) NSTimer *fadeTimer;

and change your code to say

self.fadeTimer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(bortInfo) userInfo:nil repeats:YES];

// Put this whenever you want to remove your timer and in your dealloc method.
[fadeTimer invalidate];
self.fadeTimer = nil;

This will make sure that your timer is retained by your object. Otherwise you just have to hope that the timer stays around and doesn't get autoreleased by the iPhone. And as you say it's crashing occasionally, this might be the reason ;)

I'm afraid I don't know much about run loop but am confused why your don't just use a normal NSTimer to schedule things - why bother interacting with the run loop at all?

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樱桃奶球 2024-09-20 16:28:40

预定的计时器由运行循环保留，并保留其目标。如果你想保留计时器，你必须跳过几个环节来防止保留循环（我写了一个非保留代理类，有点乱，但它有效）。
除非您知道自己在做什么（我不知道），否则不要操纵运行循环。 “预定”计时器已添加到主运行循环中。如果您像 fadeTimer 一样生成 ClockTimer，那么它会被添加到运行循环中两次。
“有时会崩溃”对任何人都没有帮助。在调试器中运行它并查看它崩溃的位置。如果幸运的话，它甚至可能会向控制台打印一些消息。

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打小就很酷 2024-09-20 16:28:40

*also you can use and this is a better and optimize way to write this line
if (theTimer != nil) {
        if([theTimer isValid]){
            [theTimer invalidate];
        }
        theTimer = nil;
    }*

*also you can use and this is a better and optimize way to write this line
if (theTimer != nil) {
        if([theTimer isValid]){
            [theTimer invalidate];
        }
        theTimer = nil;
    }*

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