如何在UICollectionView中按下视图时关闭UIImageView

Question

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{ 
    UICollectionViewFlowLayout *myLayout=[[UICollectionViewFlowLayout alloc]init]; 
    myLayout.scrollDirection=UICollectionViewScrollDirectionHorizontal; 
    [self.collectionView setCollectionViewLayout:myLayout animated:YES]; 

    UIImageView *recipeImageView=[[UIImageView alloc]initWithFrame:CGRectMake(35, 100, 250, 250)]; 
    recipeImageView.layer.borderColor = [UIColor redColor].CGColor; 
    recipeImageView.layer.borderWidth = 8.0; 
    [self.view addSubview:recipeImageView]; 
    NSString *selectedRecipeImageFileName = [self.getName objectAtIndex:indexPath.row]; 
    UIImage *selectedRecipeImage = [UIImage imageNamed:selectedRecipeImageFileName]; 
    recipeImageView.image = selectedRecipeImage; 
} 

我正在使用集合视图。首先，我按下任何图像，然后在视图上显示UIImageView。如果我按下其他图像，那么该图像将再次出现。此时它正常工作。之后，我想拥有它，所以如果我按下空白处，然后图像视图隐藏。请给我一些想法。

Answer 1

添加到您的点触手势：

[recipeImageView removeFromSuperview]; 

但你的图像视图必须是任何函数访问。所以你可以创建一个函数，然后随时调用它。

UPDATE

对不起，延迟响应。在您的.h文件中

：试试这个

首先在@interface ......添加<UIGestureRecognizerDelegate>

和@interface之后：

@property UIImageView *recipeImageView; 

在.m文件 viewDidLoad

：

UIGestureRecognizer *taps = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(removeImageView)]; 
    taps.cancelsTouchesInView = NO; 
    taps.delegate = self; 
    [self.view addGestureRecognizer:taps]; 

和你的.m文件中的某个地方：

-(void)removeImageView 
{ 
    [_recipeImageView removeFromSuperview]; 
} 

Answer 2

保留一个指向该UIImageView的指针并在其上调用removeFromSuperview。

Answer 3

在主视图上使用轻击手势可将UIImageView从超级视图中移除。

//inside viewDidLoad initilise tap gesture 
    tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(removeImageView:)]; 
    tapRecognizer.numberOfTapsRequired = 1; 

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{ 
UICollectionViewFlowLayout *myLayout=[[UICollectionViewFlowLayout alloc]init]; 
myLayout.scrollDirection=UICollectionViewScrollDirectionHorizontal; 
[self.collectionView setCollectionViewLayout:myLayout animated:YES]; 

UIImageView *recipeImageView=[[UIImageView alloc]initWithFrame:CGRectMake(35, 100, 250, 250)]; 
recipeImageView.layer.borderColor = [UIColor redColor].CGColor; 
recipeImageView.layer.borderWidth = 8.0; 

// tap gesture was initialised globally. 
[self.view addGestureRecognizer:tapGesture]; 

[self.view addSubview:recipeImageView]; 

NSString *selectedRecipeImageFileName = [self.getName objectAtIndex:indexPath.row]; 
UIImage *selectedRecipeImage = [UIImage imageNamed:selectedRecipeImageFileName]; 
recipeImageView.image = selectedRecipeImage; 

}

现在removeImageView内：

- (void)removeImageView:(UITapGestureRecognizer*)sender { 
    UIView *view = sender.view; 
    //Now here check the views on which user is taping and match if user is taping on desired view where you want remove the images from superView. and also remove the tap gesture from view. 

}