Ios simple gesture operation-modal View

1. Create a single view project

2. ViewController. h

@ Interface ViewController: UIViewController
 
  
{UIImageView * _ imgView; // display image} @ end
 

3. ViewController. m initialize _ imgView

// Initialize image view _ imgView = [[UIImageView alloc] initWithFrame: CGRectMake (0, 0,320,460)]; _ imgView. backgroundColor = [UIColor yellowColor]; _ imgView. userInteractionEnabled = YES; // remember to enable the user interaction in the Image view [self. view addSubview: _ imgView]; [_ imgView release];

4. Add a gesture operation for _ imgView

// Gesture UITapGestureRecognizer * tap = [[UITapGestureRecognizer alloc] initWithTarget: self action: @ selector (selectImage)]; // tap. numberOfTapsRequired = 2; // double-click the trigger // tap. numberOfTouchesRequired = 2; // double-finger touch trigger [_ imgView addGestureRecognizer: tap]; [tap release];

5. Implement the selectImage Method

-(Void) selectImage {UIImagePickerController * ipc = [[UIImagePickerController alloc] init]; ipc. sourceType = UIImagePickerControllerSourceTypePhotoLibrary; // you can specify the image ipc. delegate = self; [self presentViewController: ipc animated: YES completion: nil]; // modal view [ipc release];}

6. Implement two proxy Methods

// Select image call-(void) imagePickerController :( UIImagePickerController *) picker didFinishPickingMediaWithInfo :( NSDictionary *) info {_ imgView. image = [info objectForKey: Custom]; // [self dismissViewControllerAnimated: YES completion: nil];} // click Cancel call-(void) imagePickerControllerDidCancel :( UIImagePickerController *) picker {[self dismissViewControllerAnimated: YES completion: nil];}