`cancelPerformSelectorsWithTarget:` 与 `cancelPreviousPerformRequestsWithTarget:`
我正在构建一种“刻度”之间的间隔越来越小的模拟：
- (void) simulationTick {
if (self.currentTick >= kNumberOfSimulationTicks)
return; // recursion anchor
// ... do stuff ...
self.currentTick = self.currentTick + 1;
[self performSelector:@selector(simulationTick) withObject:nil
afterDelay:2.5 * pow(0.95,(double)self.currentTick)]; // acceleration
}
当离开模拟屏幕时，我想停止模拟，所以我用
[NSObject cancelPreviousPerformRequestsWithTarget:self]
我第一次尝试使用的方法
[[NSRunLoop currentRunLoop] cancelPerformSelectorsWithTarget:self]
来做到这一点……但这不起作用。
为什么不呢？
I am building a kind of simulation with ever-smaller intervals between "ticks":
- (void) simulationTick {
if (self.currentTick >= kNumberOfSimulationTicks)
return; // recursion anchor
// ... do stuff ...
self.currentTick = self.currentTick + 1;
[self performSelector:@selector(simulationTick) withObject:nil
afterDelay:2.5 * pow(0.95,(double)self.currentTick)]; // acceleration
}
When leaving the Simulation screen, I want to stop the simulation, so I do this with
[NSObject cancelPreviousPerformRequestsWithTarget:self]
I first tried using
[[NSRunLoop currentRunLoop] cancelPerformSelectorsWithTarget:self]
… but this didn’t work.
Why not?
Apparently there are many others who had the same problem and the same solution. But nowhere could I find exactly why. What’s the difference between the two?
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