Xcode 6：iOS Swift。 如何获得游戏帧率（fps）？

Question

In my current Swift project for iOS, I need to divide a variable by current FPS on the device I am running it on. In my case, the program is running on my iPad mini. I don't see a function, or any capability to do this. Any ideas? Thanks in advance!

There is however, in "GameViewController.swift" a line:

skView.showsFPS = true

But I cannot access this value.

Answer 1

You can access the SKView frameInterval property in the didMoveToView:(SKView *)view method.

If the value is 1 you are running a 60 FPS. If the value is 2 you are running at 30 FPS. Anything else, get out your calculator.

You can read up more detail in the Apple SKView docs .

You set the FPS in the GameViewController:

skView.frameInterval = 2;

Convert an integer to a float:

int myInt = 10;
float myFloat = (float)myInt;

Answer 2

I never used iOS before, but on android I used something like this on the onDraw function:

dt = currentTime - lastTime;
lastTime = currentTime;         
tempDt += dt;
fps += 1;
if (tempDt >= 1000) {
    Log.d("FPS", String.format("%d", fps));
    tempDt = 0;
    fps = 0;
}