IPhone 5 Purple Flare

Question

when the camera works some times,displaying pink lines,but last times i havent seen this problem,is this software or hardware problem?

Answer 1

What you describe has nothing to do with software, and nothing to do with hardware. It is a fact of life that all serious photographers know about; it is caused by "lens flare" and happens on every camera when the light source's angle of incidence is less than the angle of refraction of the lens material. It is purple on the iPhone because the lens is made of sapphire crystal; on other cameras it may be white, or other colors depending on the lens coating. To mitigate lens flare photographers use a lens hood that keeps the light source from striking the lens directly, or arrange themselves and the camera so the light source is behind the camera.
It is more pronounced on the iPhone because the lens has no protection from the light source striking the lens directly (that is, the lens isn't recessed). So it is your job as the photographer (as it would be with any camera) to keep the light source from reaching the lens directly. You can do this by buying a lens hood for the iPhone camera (they exist), keeping the light source at your back, or, if you can't, by holding a hand between the iPhone and the light source (but not in front of the lens, of course).
There have been a number of articles (including one by David Pogue, technology editor for the NY Times) about lens flare and cell phone cameras. It can be seen on any camera, but especially cell phone cameras (regardless of manufacturer) because the lens is usually flush with the back of the camera and thus has no protection from the light source (or a bright reflection of the light source) from striking the lens directly.