Try the following. Write a class which derives from the Overlay class and override the onTap() method. Then you can add your overlay to the your MapView. A GeoPoint object, which represents the position of you tap, is passed to the onTap() method when you tab somewhere on the map.
First, conform the class to the UIGestureRecognizerDelegate protocol Then, in the view setup: UITapGestureRecognizer *tapToSelect = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tappedToSelectRow:)]; tapToSelect.delegate = self; [self.pickerView addGestureRecognizer:tapToSelect]; And elsewhere: #pragma mark – Actions – (IBAction)tappedToSelectRow:(UITapGestureRecognizer *)tapRecognizer { if (tapRecognizer.state == UIGestureRecognizerStateEnded) { CGFloat rowHeight = [self.pickerView rowSizeForComponent:0].height; CGRect selectedRowFrame = CGRectInset(self.pickerView.bounds, 0.0, (CGRectGetHeight(self.pickerView.frame) – rowHeight) / 2.0 ); … Read more
I know this is a question that’s already answered but the chosen answer doesn’t really solve the OP’s problem, so I thought I would post this. This solution gives you the aggregate exception (i.e. all the exceptions that were thrown by the various tasks) and doesn’t block (workflow is still asynchronous). async Task Main() { … Read more
With .NET 4.5 (or .NET 4.0 + Microsoft.Bcl.Async), the best way is to use Task-based API and async/await. It allows to use the convenient (pseudo-)sequential code workflow and have structured exception handling. Example: private async void Start(object sender, RoutedEventArgs e) { try { await Task.Run(() => { int progress = 0; for (; ; ) … Read more