Question

I’m trying to implement a uitableview that its rows can be dragged to right and left (and show something behind them).
The code works fine, I’ve implemented it using the following methods:

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event;
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event;
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event;

My problem is that the rows also contain UIButtons that when clicking them- should be clicked but when dragging – should drag the entire cell.
I’ve found this solution. Basically to bubble up the events when clicking on the UIButtons:

[super touchesBegan:touches withEvent:event];
[self.nextResponder touchesBegan:touches withEvent:event]; 

But, it seems taht the event touchesMoved only bubbles once.

I’ve seen all sort of questions in this area. Example. But I don’t see any solution or responses.

Any help, suggestion or creative workaround would be appreciated!

Answer 1

Instead of implementing touchesBegan, etc. why not use a UIPanGestureRecognizer? I tested this with just a simple rectangular view which was mostly covered by a UIButton. The view was dragged, no matter where I touched, and the button method fired if I clicked over the button.

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePanGesture:)];
    [self.theView addGestureRecognizer:panGesture]; //theView is IBOutlet for small view containing a button
}

-(void)viewDidAppear:(BOOL)animated {
    self.currentViewFrame = self.theView.frame;
}

- (IBAction)handlePanGesture:(UIPanGestureRecognizer *)sender {
    CGPoint translate = [sender translationInView:self.view];

    CGRect newFrame = self.currentViewFrame;
    newFrame.origin.x += translate.x;
    newFrame.origin.y += translate.y;
    sender.view.frame = newFrame;

    if (sender.state == UIGestureRecognizerStateEnded)
        self.currentViewFrame = newFrame;
}

-(IBAction)doClick:(id)sender {
    NSLog(@"click");
}