Question

我创建了一个照片幻灯片放映应用程序，其中包含数组中的图像显示在滚动视图中。我已经为它添加了触摸事件。触摸它应该是UIimageView上触摸图像的详细视图但我没有通过鼠标点击（我在模拟器上运行它），但我通过alt +鼠标点击得到它 - 当时有两点就像在地图上缩放我知道这是正确的方法，所以如何在单击鼠标时获得适当的触摸？

添加代码

 - (void)viewDidLoad
{
    [super viewDidLoad];
    scrollView.delegate = self;
    scrollView.scrollEnabled = YES;
    int scrollWidth = 120;
    scrollView.contentSize = CGSizeMake(scrollWidth,80);

    int xOffset = 0;
    imageView.image = [UIImage imageNamed:[imagesName objectAtIndex:0]];

    for(int index=0; index < [imagesName count]; index++)
    {
        UIImageView *img = [[UIImageView alloc] init];
        img.bounds = CGRectMake(10, 10, 50, 50);
        img.frame = CGRectMake(5+xOffset, 0, 160, 110);
        NSLog(@"image: %@",[imagesName objectAtIndex:index]);
        img.image = [UIImage imageNamed:[imagesName objectAtIndex:index]];
        [images insertObject:img atIndex:index];



        scrollView.contentSize = CGSizeMake(scrollWidth+xOffset,110);
        [scrollView addSubview:[images objectAtIndex:index]];

        xOffset += 170;
    }
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
     [self.nextResponder touchesBegan:touches withEvent:event];

     UITouch * touch = [[event allTouches] anyObject];

     for(int index=0;index<[images count];index++)
     {
         UIImageView *imgView = [images objectAtIndex:index];


         NSLog(@"x=%f,y=%f,width=%f,height=%f",     
  imgView.frame.origin.x,imgView.frame.origin.y,
  imgView.frame.size.width,imgView.frame.size.height);
  NSLog(@"x= %f,y=%f",[touch locationInView:self.view].x,[touch      
  locationInView:self.view].y) ;


         if(CGRectContainsPoint([imgView frame], [touch locationInView:scrollView]))
         {
             [self ShowDetailView:imgView];
             break;
         }
    }
}

-(void)ShowDetailView:(UIImageView *)imgView
{
    imageView.image = imgView.image;
}

Answer 1

我不会在touchesBegan:方法中自行执行所有命中测试，而是高度推荐使用UITapGestureRecognizer。像这样修改你的代码：

- (void)viewDidLoad
{
    //...

    for(int index=0; index < [imagesName count]; index++)
    {
        UIImageView *img = [[UIImageView alloc] init];
        img.bounds = CGRectMake(10, 10, 50, 50);
        img.frame = CGRectMake(5+xOffset, 0, 160, 110);
        NSLog(@"image: %@",[imagesName objectAtIndex:index]);
        img.image = [UIImage imageNamed:[imagesName objectAtIndex:index]];
        [images insertObject:img atIndex:index];

        UITapGestureRecognizer *tapGR = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTap:)]

        [img addGestureRecognizer:tapGR];
        img.userInteractionEnabled = YES;

        /...

    }
}

- (void)handleTap:(UIGestureRecognizer *)sender
{
     UIImageView *iv = sender.view;
     [self ShowDetailView:iv];
}

如何通过图像视图上的触摸事件进入详细视图？

1 个答案: