How to drag label and drop on a box in objective c

Question

I have a couple of labels and boxes in a view and i want to drag and drop labels on the boxes but the some of labels become hide under the boxes why this happen. I make a subview gameLayer and apply touches methods on this view. Here is code

for (int i = 0; i < length; i++)
{

    // Create UILabel for Column
    _lbl = [[UILabel alloc] initWithFrame:rect1];
    _lbl.tag = 100+i;
    _lbl.textAlignment = NSTextAlignmentCenter;
    _lbl.backgroundColor = [UIColor blueColor];
    _lbl.textColor = [UIColor whiteColor];
    _lbl.font = [UIFont fontWithName:@"Verdana-Bold" size:17.0];
    [self.gameLayer addSubview:_lbl];
     _lbl.text=[MainArrayFirst objectAtIndex:i];
    [_lbl sizeToFit];

    // Create UILabel Box for ColumnB
    box = [[UILabel alloc] initWithFrame:rect1];
    box.tag = 300+i;
    box.layer.borderColor = [UIColor blueColor].CGColor;
    box.layer.borderWidth = 2.0;
    [self.gameLayer addSubview:box];



  //touches

   -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
    {
      CGPoint pt = [[touches anyObject] locationInView:self.gameLayer];
      _xOffset = pt.x - self.gameLayer.center.x;
      _yOffset = pt.y - self.gameLayer.center.y;

       }

    - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {

       UITouch *touch = [[event allTouches] anyObject];
       CGPoint currentPoint = [touch locationInView:self.gameLayer];

if (touch.view != self.gameLayer)
    [touch view].center = currentPoint;
     }

score 1 · Accepted Answer · edited May 23 '17 at 11:54

let go throught the iteration when your for loop called

i == 0 label1 add box1 add

i == 1 label2 add box2 add

now when you try to drag label1 on Box2 it will be below the box because it add after it so its z order is grater than label1

so for solve your problem you can set your label z order

for (int i = 0; i < length; i++)
{

    // Create UILabel for Column
    _lbl = [[UILabel alloc] initWithFrame:rect1];
    _lbl.tag = 100+i;
    _lbl.textAlignment = NSTextAlignmentCenter;
    _lbl.backgroundColor = [UIColor blueColor];
    _lbl.textColor = [UIColor whiteColor];
    _lbl.font = [UIFont fontWithName:@"Verdana-Bold" size:17.0];
    [self.gameLayer addSubview:_lbl];
     _lbl.text=[MainArrayFirst objectAtIndex:i];
    _lbl.layer.zPosition = 2;
    [_lbl sizeToFit];

    // Create UILabel Box for ColumnB
    box = [[UILabel alloc] initWithFrame:rect1];
    box.tag = 300+i;
    box.layer.borderColor = [UIColor blueColor].CGColor;
    box.layer.borderWidth = 2.0;
    box.layer.zPosition = 1;
    [self.gameLayer addSubview:box];
}

also there are many ways to do this stuff you can refers this link

score 0 · Answer 2 · answered Apr 28 '17 at 14:11

0

Go to your storyboard select the viewController and try changing the order of the label and "boxes" on 'Document Outline'(The list shown on the left of storyboard window). This might bring up your label to the front.

answered Apr 28 '17 at 14:11

John Xavier

27
7

I,m not using storyboards as labels and boxes are created programmatically ,my reputation is low otherwise i will down vote you as it is not a proper answer.... – Alex Apr 29 '17 at 04:47

How to drag label and drop on a box in objective c

2 Answers2