Question

我有100张图像存储在数组中并使用swipe gesture.

随机显示在单个imageview中

在双击时，我想将该特定图像存储在NSUserDefault中。任何人都可以帮助我实现这一目标。

我试过这个

randIdx=arc4random()%[FrontsCards count];

NSString *imageName=[FrontsCards objectAtIndex:randIdx];

NSString *fullImageName=[NSString stringWithFormat:@"%@",imageName];

int padding=0;

CGRect imageViewFrame=CGRectMake(scrollView.frame.size.width*m+padding, scrollView.frame.origin.y, scrollView.frame.size.width-2*padding, scrollView.frame.size.height);

ImgView=[[UIImageView alloc]initWithFrame:imageViewFrame];

[ImgView setImage:[UIImage imageNamed:fullImageName]];

[scrollView addSubview:ImgView];

[ImgView setAccessibilityIdentifier:[FrontsCards objectAtIndex:randIdx]];


[[NSUserDefaults standardUserDefaults]setObject:UIImagePNGRepresentation(@"") forKey:@""];

先谢谢。

Answer 1

在-viewDidLoad中为您的图片添加UITapGestureRecognizer。您需要在默认设置为UIImageView的{{1}}上启用用户互动。

NO

然后添加@selector来处理双击，如下所示：

- (void)viewDidLoad {
    [super viewDidLoad];

    [self.imgView setUserInteractionEnabled:YES];

    imgArray = [NSArray arrayWithObjects:@"Default.png", @"Default2.png", @"Default3.png", nil];
    NSInteger randomNumber = arc4random() % [imgArray count];

    UITapGestureRecognizer *doubleTapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleDoubleTap:)];
    NSString *strImgName = [imgArray objectAtIndex:randomNumber];
    [self.imgView setImage:[UIImage imageNamed:strImgName]];
    NSLog(@"Image Name = %@", strImgName);
    [self.imgView setTag:randomNumber];

    doubleTapGestureRecognizer.numberOfTapsRequired = 2;
    [self.imgView addGestureRecognizer:doubleTapGestureRecognizer];
}

Sample Project Dropbox Link

Answer 2

您可以像这样在viewDidLoad中为您的图片添加UITapGestureRecognizer

- (void)viewDidLoad
{

     UITapGestureRecognizer *gestureTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(doubleTap:)];
     [myImageView addGestureRecognizer:gestureTap];
     gestureTap.delegate = self;
     gestureTap.numberOfTapsRequired = 2;

     [self.imageView addGestureRecognizer:gestureTap];
}

然后在手势的动作中，您可以将图像保存到NSUserDefault，就像这样

 -(void)doubleTap2:(UITapGestureRecognizer *)gesture
 {
     [[NSUserDefaults standardUserDefaults] setValue:self.imageView.image forKey:@"imagesaved"];
     [[NSUserDefaults standardUserDefaults] synchronize];
 }

Answer 3

您可以尝试这样：

显示：

  YourMethod {

    randIdx=arc4random()%[FrontsCards count];

    NSString *imageName=[FrontsCards objectAtIndex:randIdx];

    NSString *fullImageName=[NSString stringWithFormat:@"%@",imageName];

    int padding=0;

    CGRect imageViewFrame=CGRectMake(scrollView.frame.size.width*m+padding, scrollView.frame.origin.y, scrollView.frame.size.width-2*padding, scrollView.frame.size.height);

    ImgView=[[UIImageView alloc]initWithFrame:imageViewFrame];

    [ImgView setImage:[UIImage imageNamed:fullImageName]];
    UITapGestureRecognizer *tapped = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tappedAction:)];
    tapped.numberOfTapsRequired = 2;
    [ImgView addGestureRecognizer:tapped];
    [ImgView setTag:randIndx];
    [scrollView addSubview:ImgView];

}

存储......

  -(void)tappedAction:(UITapGestureRecognizer*)gesture
  {
   // storing in nsuserdefault ...
    int indArr = [sender.view tag];
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
   NSData *imageData = UIImagePNGRepresentation([sender.view image]);
    NSString *thKey = [NSString stringWithFormat:@"%i", indArr];
    [defaults setObject:imageData forKey:theKey];

}

想要双击图像

3 个答案: