IOS仿桌面拖动桌面图标

手势拖动

UIPanGestureRecognizer * panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self
                                                                                                    action:@selector(doMoveAction:)];

核心部分

拖到到前面还是后面的判断

                    Boolean preMove =true;
                    //判断前后移动四种情况
                    //(exstartPoint.x && ey  || (ey==startPoint.y && ex //偏差5都认为相等
                    CGFloat diff =10;
                    if ((startPoint.x-ex>diff && startPoint.y-ey>diff)||(ex>(startPoint.x+diff) && (ey+diff) ||(fabs(ex-startPoint.x)<=diff && (ey+diff)





完整代码