小编EdS*_*per的帖子

如何检测MKPolyline是否与自身相交？我试过研究这个,但只发现有两行或更多行的问题.如何检测我是否只有一行/一笔？我希望在用户释放触摸后检测到它.

我目前在touchEnded函数中有这个代码.

            CGPoint location = [touch locationInView:self.mapView];
            CLLocationCoordinate2D coordinate = [self.mapView convertPoint:location toCoordinateFromView:self.mapView];
            [self.coordinates addObject:[NSValue valueWithMKCoordinate:coordinate]];
            NSInteger numberOfPoints = [self.coordinates count];

            if(numberOfPoints > 2)
            {
                [self setLineLength:[self getLengthArea]];
                if([self lineLength] < 401)
                {
                    if (numberOfPoints > 2)
                    {
                        CLLocationCoordinate2D points[numberOfPoints];
                        for (NSInteger i = 0; i < numberOfPoints; i++) {
                            points[i] = [self.coordinates[i] MKCoordinateValue];
                        }
                        [self.mapView addOverlay:[MKPolyline polylineWithCoordinates:points count:numberOfPoints]];
                    }

                    PCAnnotation *ann = [[PCAnnotation alloc] init];
                    [ann setCoordinate:coordinate];
                    ann.title = @"End";
                    [self.mapView addAnnotation:ann];
                }
                else
                {
                    NSArray *overlayItems = [self.mapView …

我的页面中有一个数据表,其中包含状态列和视图详细信息列.单击视图详细信息后,它将弹出一个模态,模态包含一个状态下拉列表,当更改时,数据库中的某个值将更改.但是,在关闭模态后,数据表中的值不会更改.如何重新加载数据表而不重新初始化它,或者如何获取我单击的列和行,以便我可以更改某个列和行的值.我有这个代码用于初始化doc.ready上的数据表

 function createTable(data){
        for (i in data){
            var message = "<tr>";
            var statusHolder = "";


            if(data[i].status == "open"){
                statusHolder = "Open";
            } else if (data[i].status == "resolved"){
                statusHolder = "Resolved";
            } else {
                statusHolder = "Closed";
            }
            var id = data[i].id;
            message+= "<td>" + statusHolder + "</td>";
            message+= "<td><input id = 'ticketId' type ='hidden' value = " + data[i].id +" /><input type = 'hidden' id = 'support-type-name' value = 'call-back'/><a href='javascript:retrieveCommentsInfo(" + data[i].id +")' id='view-ticket-info'>" + " View details" + …