UIGestureRecognizerDelegate implemenation doesn't work - ios

Question

I've tried to implement the UIGestureRecognizerDelegate in my ViewController and somehow the methods aren't called. This is the controller:
#import "DiaryEntryViewController.h"
#import "UINavigationController+BarManagement.h"
#interface DiaryEntryViewController ()<UIGestureRecognizerDelegate>
#property (strong, nonatomic) NSManagedObjectContext *managedObjectContext;
#property (weak, nonatomic) IBOutlet UITextView *textView;
#end
#implementation DiaryEntryViewController
-(void)viewWillAppear:(BOOL)inAnimated{
[super viewWillAppear:inAnimated];
self.navigationController.barsHidden = NO;
}
-(void)viewDidAppear:(BOOL)inAnimated{
[super viewDidAppear:inAnimated];
[self.navigationController hideBarsWithDelay:2.0];
}
-(void)viewWillDisappear:(BOOL)inAnimated{
[self.navigationController setBarsHidden:NO animated:YES];
[super viewWillDisappear:inAnimated];
}
-(NSManagedObjectContext *)managedObjectContext{
return self.diaryEntry.managedObjectContext;
}
-(BOOL)saveDiaryEntry{
BOOL theResult = NO;
NSError *theError = nil;
theResult = [self.managedObjectContext save:&theError];
if(!theResult){
NSLog(#"saveItem %#", theError);
}
return theResult;
}
-(CGRect)visibleBounds{
CGRect theBounds = self.view.bounds;
if([self respondsToSelector:#selector(topLayoutGuide)] && [self respondsToSelector:#selector(bottomLayoutGuide)]){
theBounds.origin.y = [self.topLayoutGuide length];
theBounds.size.height -= [self.topLayoutGuide length] + [self.bottomLayoutGuide length];
}
return theBounds;
}
-(IBAction)toogleBars:(id)sender{
NSLog(#"toogleBars");
UINavigationController *theController = self.navigationController;
BOOL theHiddenFlag = theController.barsHidden;
[theController setBarsHidden:!theHiddenFlag animated:YES];
if(theHiddenFlag){
[theController hideBarsWithDelay:2.0];
}
}
-(BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)inRecognizer{
NSLog(#"gestureRecognizerShouldBegin");
UIView *theView = self.textView;
CGPoint thePoint = [inRecognizer locationInView:theView];
return !CGRectContainsPoint(theView.bounds, thePoint);
}
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldBeRequiredToFailByGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
NSLog(#"bla");
return YES;
}
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRequireFailureOfGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
NSLog(#"ble");
return YES;
}
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
NSLog(#"blä");
return YES;
}
#end
It does call toogleBars methods, but none of the recognizer methods.

Answer 1

Do not forget to declare and add the recognizer to the view you want to detect that tap or swipe in
example:
Add a property like "theTapRecognizer" to the VC.
Alloc and init that recognizer:
self.theTapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget: self action: #selector(someMethod:)];
self.theTapRecognizer.delegate = self;
[someView addGestureRecognizer: selftheTapRecognizer];
someView is the placeholder text to the view you want to init that recognizer in, it can be the whole self.view or some subview,
you can listen for any interaction with that gesture recognizer with the following delegate method
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch

Answer 2

Assuming you have added the UIGestureRecognizer from the storyboard, you need to remember to CTRL + Drag the gesture object to the UIViewController yellow circle image and set the delegate.
Your UIGestureRecognizer object will be on the top of the UIViewController view. CTL Drag this to the yellow circle ViewController icon
Then this pop-up will show and select 'Delegate' so that the gesutureRecognizer will use the delegate methods.