Incompatible pointer types sending 'UITapGestureRecognizer *' to parameter of type 'UIView * _Nonnull'

Question

UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapGestureAction)];
tapGestureRecognizer.numberOfTapsRequired = 1;

self.fullScreenImageView = [[UIImageView alloc]initWithFrame:self.frame];
self.fullScreenImageView.image = [UIImage imageNamed:@"family"];
self.fullScreenImageView.userInteractionEnabled = YES;
[self addSubview:self.fullScreenImageView];
[self.fullScreenImageView addSubview:tapGestureRecognizer];

what's wrong with these code.
Xcode 7.0 gives this error :

Incompatible pointer types sending 'UITapGestureRecognizer *' to parameter of type 'UIView * _Nonnull'

Answer 1

You should use addGestureRecognizer for adding a gesture to a UI object

// [self.fullScreenImageView addSubview:tapGestureRecognizer];

[self.fullScreenImageView addGestureRecognizer: tapGestureRecognizer];

Answer 2

    UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapGestureAction)];
    tapGestureRecognizer.numberOfTapsRequired = 1;
    [self addGestureRecognizer:tapGestureRecognizer];

    self.fullScreenImageView = [[UIImageView alloc]initWithFrame:self.frame];
    self.fullScreenImageView.image = [UIImage imageNamed:@"family"];
    self.fullScreenImageView.userInteractionEnabled = YES;
    [self addSubview:self.fullScreenImageView];

this is the solution. i found thanks @anhtu