问iOS - 在触摸UITextField外部时关闭键盘？

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{

      [self.view endEditing:YES];// this will do the trick

}

UIGestureRecognizer *tapper;

- (void)viewDidLoad

{

    [super viewDidLoad];

    tapper = [[UITapGestureRecognizer alloc]

                initWithTarget:self action:@selector(handleSingleTap:)];

    tapper.cancelsTouchesInView = NO;

    [self.view addGestureRecognizer:tapper];

}

- (void)handleSingleTap:(UITapGestureRecognizer *) sende

{

    [self.view endEditing:YES];

}

UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(dismissKeyboard)];

[self.view addGestureRecognizer:tap];

-(void)dismissKeyboard 

{

    [aTextField resignFirstResponder];

}

let tapGesture = UITapGestureRecognizer(target: self, action: #selector(self.dismissKeyboard (_:)))

self.view.addGestureRecognizer(tapGesture)

func dismissKeyboard (_ sender: UITapGestureRecognizer) {

    aTextField.resignFirstResponder()

}