每隔一段时间比较变量的值
嘿，我在以特定时间间隔将 CGPoint（具有两个整数的结构：x 和 y）的值与另一个值进行比较时遇到问题。
一种称为位置，具有光标所在位置的值。每隔半秒左右，我想看看它是否改变了。我该怎么做？语言是 Objective-C（所以 C++/C 的东西应该可以工作）
Hey I have a problem comparing the value of a CGPoint (struct with two ints: x and y) with another at certain time intervals.
One is called location and has the value of where the cursor is. Every half a second or so, I want to see if it changed. How do I do this? The language is Objective-C (so C++/C stuff should work)
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你想用这个做什么？使用键值观察来观察一个或两个值何时发生变化是否更有意义？
What are you trying to do with this? Would it make more sense to use Key Value Observing to observe when one or both values change?
查看 NSTimer 文档。它做你想做的事。
Take a look at the NSTimer documentation. It does what you want.
正如 CGGeometry 文档中所述，Apple 提供了一个函数 CGPointEqualToPoint() 来执行此操作。您将有一个 CGPoint 变量来存储旧值并将其与获得的新值进行比较。
As noted in the CGGeometry docs, Apple provides a function,
CGPointEqualToPoint(), for doing just this. You would have a CGPoint variable that stores the old value and compare it to the new value you get.