IOS development,

IOS development,
Principle FPS computing

CoreAnimation has a very useful classCADisplayLinkThis class is called before each frame is drawn and can obtain the timestamp. Therefore, we only need to calculate the number of frames in 1 s.

-(Void) envokeDisplayLink :( CADisplayLink *) displayLink {if (_ lastTimestamp =-1) {_ lastTimestamp = displayLink. timestamp; return ;}_ countPerFrame ++; NSTimeInterval interval = displayLink. timestamp-_ lastTimestamp; if (interval <1) {return ;}_ lastTimestamp = displayLink. timestamp; CGFloat fps = _ countPerFrame/interval ;//...}

Acquisition of memory and CPU Information

The methods in the mach header file are used to obtain the CPU and memory. The underlying API is called and the C method is used to obtain the information.

• LHPerformanceUtil