objective c - something strange about TouchesMoved -


i want output coordinate of each touch. , here code:

- (void)drawrect:(cgrect)rect {     [[uicolor blackcolor] set];     (int = 0; i<_touches.count; i++){         cgpoint pos=[[_touches objectatindex:i] locationinview:self];         nsstring* str = [nsstring stringwithformat:@" %d:(%d,%d)",i+1,(int)pos.x, (int)pos.y];         [str drawatpoint:cgpointmake(0,16+16*i) withfont:font];     } }  - (void)touchesbegan:(nsset *)touches withevent:(uievent *)event{     nsarray* objects = [touches allobjects];     (int i=0;i<objects.count;i++){         [_touches addobject:[objects objectatindex:i]];     }     [self setneedsdisplay]; }  - (void)touchesmoved:(nsset *)touches withevent:(uievent *)event{     [self setneedsdisplay]; }

it works. output like: 1:(20, 50) 2:(30, 69) ... thing is, every time dragging on screen, coordinate of latest touch changing while dragging. believe touchesmoved doesn't have effects _touches coordinate of each touch stored, latest coordinate should not changing while moving (dragging). helps appreciated. lot.


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