Iphone 仅当用户点击图像视图时，在UIScrollView上为图像显示UIButton Done

如何编写UIButton代码，使其仅在用户点击UIScrollView查看图像时显示

 - (void)viewDidLoad

{    
 self.view.backgroundColor = [UIColor blackColor];
  UIScrollView *imageScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
   imageScrollView.pagingEnabled = YES;
NSInteger numberOfViews = 61;
for (int i = 0; i < numberOfViews; i++) {
    CGFloat xOrigin = i * self.view.frame.size.width;

    UIButton *myButton = [UIButton buttonWithType:UIButtonTypeCustom];

    [myButton addTarget:self action:@selector(dismissView:) forControlEvents:UIControlEventTouchUpInside];

    myButton.frame = CGRectMake(xOrigin, 10, 60, 35);

    [myButton.layer setMasksToBounds:YES];

    [myButton.layer setCornerRadius:10.0f];

    myButton.layer.borderWidth = 2;

    myButton.layer.borderColor = [[UIColor whiteColor] CGColor];

    [myButton setTitle:@"Done" forState:UIControlStateNormal];

    myButton.backgroundColor = [UIColor blackColor];

    NSString *imageName = [NSString stringWithFormat:@"image%d.png", i];
    UIImage *image = [UIImage imageNamed:imageName];
    UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
    imageView.frame = CGRectMake(xOrigin, 0, self.view.frame.size.width, self.view.frame.size.height);
    [imageScrollView addSubview:imageView];
    [imageScrollView addSubview:myButton];
    [imageView release];
}
imageScrollView.contentSize = CGSizeMake(self.view.frame.size.width * numberOfViews, self.view.frame.size.height);
[self.view addSubview:imageScrollView];
[imageScrollView release];
}

并启动手势识别器

  UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTap:)];
   tap.numberOfTapsRequired = 1;
  [self addGestureRecognizer:tap];
  [tap release];

那个么，当用户点击图像视图时，我如何在handle tap方法中编写代码来显示done按钮呢

 - (void)handleTap:(UIGestureRecognizer*)tap {

   }

---

谢谢您的帮助。

您需要在图像视图而不是ViewController上添加手势识别器

此外，您还需要启用图像视图的用户交互，如下所示：

imageView.userInteractionEnabled = YES;

---

当您滚动显示按钮时，请选中

UIScrollViewDelegate

方法，然后如果要隐藏该按钮，请将其隐藏

对于handleTap，您可以设置

[imageView addgestureRecognitor:tap]

而不是

[自添加手势识别器：点击]

在
ViewDidLoad
中创建按钮，并在用户点击刚刚设置的图像时将其隐藏`

button.hidden = NO;

UITapGestureRecognizer*点击=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector（handleTap:）]；tap.numberOfTapsRequired=1；[imageView ADDGESTURE识别器：点击]；-（void）handleTap：（id）当点击设置委托（如点击.delegate=self）时，发送方{{u myButton.hidden=NO；}不工作；然后转到.h文件并写下你能告诉我你面临什么问题吗？在handleTap中放置一个断点，然后检查它是否指向该方法。我在句柄点击处添加了断点，它将指向该方法。想知道为什么不显示done button Set button.hidden=否；并设置背景色以检查按钮框。
button.hidden = NO;