Drag & Drop iOS

In iOS, we can detect drag and drop(swipe operation).
This is a sample for it.

Sample

This sample is to create new view in ViewController and set pan event
using UIPanGestureRecognizer

ViewController.m

@interface ViewController ()
@property (nonatomic) UIView *dragView;
@end

- (void)viewDidLoad
{
    [super viewDidLoad];
	// Do any additional setup after loading the view, typically from a nib.
    [self.view setBackgroundColor:[UIColor blueColor]];
    
    // Test Drag
    [self dragViewTest];
}

#pragma mark -
#pragma mark - Drag and Drop
-(void)dragViewTest {
    // Create View
    CGRect rect = CGRectMake(10, 10, 300, 100);
    self.dragView = [[UIView alloc] initWithFrame:rect];
    [self.dragView setBackgroundColor:[UIColor redColor]];
    [self.view addSubview:self.dragView];
    
    // Drag
    UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(dragView:)];
    // Add Gesture to view
    [self.dragView addGestureRecognizer:pan];
}

-(void)dragView:(UIPanGestureRecognizer *)sender {
    CGPoint location = [sender translationInView:self.view];
    NSLog(@"Drag x %f, y %f", location.x, location.y);
    
    self.dragView.frame = CGRectMake(location.x, 10, 300, 100);
}

The important thing is to create UIPanGestureRecognizer instance and set it to the target view. In this case, it is view which is created in dragViewTest method.

Result