转载自：http://bbs.weiphone.com/read-htm-tid-590862.html
把CGPoint放入数组的过程是这样的：
NSArray
*array=[NSArray arrayWithObjects:NSStringFromCGPoint(0.0f,0.0f),NSStringFromCGPoint(0.0f,0.0f),nil];
从数组中取值的过程是这样的：
CGPoint
point=CGPointFromNSString（[array objectAtIndex:2]）；