Question

我是iOS的新手。

我正在开发一个我有2 NSMutableArray的应用。我想将数组图像加载到ImageView。

我想拍摄第一张图片并将其添加到ImageView。当使用向左滑动时，我想要将数组中的下一个图像添加到新的ImageView并显示。如果他们向后滑动，请加载以前的e.t.c

当用户双击图像时，我还想将第二个数组中的图像加载到ImageView。

我试过这个

AppDelegate * delegate=(AppDelegate *)[[UIApplication sharedApplication]delegate];

    NSLog(@"%lu",(unsigned long)[delegate.FrontsCards count]);
    ImgView= [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];

    //ImgView.image=[UIImage imageNamed:@"cloub1.png"];

    int random=arc4random()%[delegate.FrontsCards count];
     NSLog(@"%d",random);

    ImgView.image=[delegate.FrontsCards objectAtIndex:random];
    [self.view addSubview:ImgView];
    currentImageIndex = 0;
    ImgView.userInteractionEnabled = YES;

    UISwipeGestureRecognizer *recognizer;

    recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)];
    [recognizer setDirection:(UISwipeGestureRecognizerDirectionLeft)];
    [[self view] addGestureRecognizer:recognizer];

    [super viewDidLoad];

}

-(void)handleSwipeFrom:(UISwipeGestureRecognizer *)recognizer
{
    NSLog(@"Swipe received.");

    AppDelegate * delegate=(AppDelegate *)[[UIApplication sharedApplication]delegate];

    for(int i=0;i<52;i++)
    {
        NSLog(@"%d",i);
        ImgView.image=[delegate.FrontsCards objectAtIndex:i];
    }

    ImgView.image=[UIImage imageNamed:@"cloub3.png"];
}

有人可以帮我这么做吗？提前谢谢。

Answer 1

首先，您是否仅为iOS 6及更高版本构建应用程序？如果是，您可以使用UICollectionView启用分页，一次只能看到一个项目。博文"Creating a Paged Photo Gallery With a UICollectionView"解释了如何做到这一点。

如果您正在构建iOS 6以下的应用，您可以找到类似的自定义网格视图来替换像GMGridView或AQGridView这样的UICollectionView。另一种选择是在其中构建一个带有3个UIImageView的自定义UIScrollView，然后在用户滚动到列表末尾时相应地调整滚动视图偏移。但是，需要一些时间来使自定义UIScrollView像其他现有的开源网格视图或UICollectionView一样进行优化。

对于双击，您可以在UICollectionView或网格视图或自定义滚动视图中使用UITapGestureRecognizer numberOfTapsRequired = 2。双击发生后，计算点击发生的索引路径（使用indexPathForItemAtPoint: UICollectionView或indexForItemAtPoint: AQGridView或任何其他类似方式）。获得索引后，您可以使用第二个数组执行所需的操作。

Answer 2

有两种方法：

滑动手势：如果您想编写自己的滑动手势，可以执行以下操作：

不仅定义属性图像名称的属性，还定义一个索引，显示您正在查看的卡片：

@property (nonatomic, strong) NSMutableArray *imageNames;
@property (nonatomic) NSInteger imageIndex;

将手势添加到图片视图中：

UISwipeGestureRecognizer *swipe;

// by the way, if not using ARC, make sure to add `autorelease` to
// the following alloc/init statements

swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipe:)];
swipe.direction = UISwipeGestureRecognizerDirectionLeft;
[self.imageView addGestureRecognizer:swipe];

swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipe:)];
swipe.direction = UISwipeGestureRecognizerDirectionRight;
[self.imageView addGestureRecognizer:swipe];

编写手势识别器处理程序：

- (void)handleSwipe:(UISwipeGestureRecognizer *)gesture
{
    UIViewAnimationOptions option = kNilOptions;

    if (gesture.direction == UISwipeGestureRecognizerDirectionRight)
    {
        // if we're at the first card, don't do anything

        if (self.imageIndex == 0)
            return;

        // if swiping to the right, maybe it's like putting a card
        // back on the top of the deck of cards

        option = UIViewAnimationOptionTransitionCurlDown;

        // adjust the index of the next card to be shown

        self.imageIndex--;
    }
    else if (gesture.direction == UISwipeGestureRecognizerDirectionLeft)
    {
        // if we're at the last card, don't do anything

        if (self.imageIndex == ([self.imageNames count] - 1))
            return;

        // if swiping to the left, it's like pulling a card off the 
        // top of the deck of cards

        option = UIViewAnimationOptionTransitionCurlUp;

        // adjust the index of the next card to be shown

        self.imageIndex++;
    }

    // now animate going to the next card; the view you apply the 
    // animation to is the container view that is holding the image
    // view. In this example, I have the image view on the main view,
    // but if you want to constrain the animation to only a portion of
    // the screen, you'd define a simple `UIView` that is the dimensions
    // that you want to animate and then put the image view inside
    // that view, and replace the `self.view` reference below with the
    // view that contains the image view.

    [UIView transitionWithView:self.view
                      duration:0.5
                       options:option
                    animations:^{
                        self.imageView.image = [UIImage imageWithContentsOfFile:self.imageNames[self.imageIndex]];
                    }
                    completion:nil];
}

显然，如果你想编写自己的双击手势，请继续为此创建一个手势，以及该手势的处理程序，例如：

UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTap:)];
tap.numberOfTapsRequired = 2;
[self.imageView addGestureRecognizer:tap];

正如其他人所建议的那样，如果你不想像上面那样编写自己的图像处理代码，你可以使用各种其他控件，例如：一个UIPageViewController，一个UICollectionView或其他类别中的任何一个，可以促进一组图像之间的导航。

Answer 3

单步：

您需要将一个滑动手势识别器放在imageView上，当您收到回调时，从阵列中选择正确的图像。

UISwipeGestureRecognizer *g = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeDetected:)];

-

'更好的IMO将是一个滚动视图 - 当你滑动'

时会获得动画

Swipegesture在IOS中识别

3 个答案: