IOS仿桌面拖动桌面图标

手势拖动

1UIPanGestureRecognizer * panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self
2                                                                                                    action:@selector(doMoveAction:)];

核心部分

拖到到前面还是后面的判断

1Boolean preMove =true;
2                    //判断前后移动四种情况
3                    //(ex<startPoint.x && ey<startPoint.y)||(ex>startPoint.x && ey<startPoint.y) ||(ex==startPoint.x && ey<startPoint.y)  || (ey==startPoint.y && ex <startPoint.x)
4                    //偏差5都认为相等
5                    CGFloat diff =10;
6                    if ((startPoint.x-ex>diff && startPoint.y-ey>diff)||(ex>(startPoint.x+diff) && (ey+diff)<startPoint.y) ||(fabs(ex-startPoint.x)<=diff && (ey+diff)<startPoint.y)|| (fabs(ey-startPoint.y)<=diff && (ex+diff) <startPoint.x) )

完整代码