Question

我有UIScrollView个UIImageViews。我需要将图片从UIScrollView拖放到另一个视图。在scrollView touch之外工作。但内部滚动视图触摸不起作用。我使用了touchesBegan，touchesMoved等方法。请帮我。

-(IBAction)selectBut:(id)sender
{

 scrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(x,y,w,h)];

 scrollView.userInteractionEnabled = YES;

 int y = 0;

 for (int i = 0; i < [myArray count]; i++) {

UIImageView *image = [[UIImageView alloc]initWithFrame:CGRectMake(0, y, 75, 30)];

 image.userInteractionEnabled = YES;

  y=y+35;

 [scrollView addSubview:image];

}

[self.view addSubview:scrollView];

[scrollView setContentSize:CGSizeMake(150, 300)]

}

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event

{

   UITouch *touch = [touches anyObject];

    if ([touch tapCount] == 1) {

        NSLog(@"One touch !!");
    }

}

Answer 1

您需要使用UIImageView自己的视图继承来自定义UIImageView。在该自定义子类中提供触摸方法，并将其添加到UIScrollView ..

UIScrollview的子视图永远不会直接调用touchesBegan方法。您需要使用子视图进行自定义，以获取添加的子视图/自定义视图的touchesBegan属性。

我的意思是说像ImageView的子类一样

CustomImageView *imageView = [[CustomImageView alloc] initWithFrame:CGRectMake(0, 0, 200, 200)];
[imageView setUserInteractionEnabled:YES];
[scrollView addSubview:imageView];
[imageView release];

CustomImageView类应该从UIImageView继承，如

 @interface CustomImageView : UIImageView
  {
  }

<。>文件中的

  #import "CustomImageView.h"

@implementation CustomImageView


    - (id)initWithFrame:(CGRect)frame
   {
self = [super initWithFrame:frame];
if (self) {

}
return self;
}



    - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
      NSLog(@"%s", __FUNCTION__);

     }

    - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {


    }

    - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {


    UITouch *touch = [touches anyObject];

      if ([touch tapCount] == 2) {
    drawImageView.image = nil;
    return;
    }

     }

Answer 2

在滚动视图中添加Tap手势识别器，以便在滚动视图内启用触摸：

UITapGestureRecognizer *singlTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(methodName:)];
singlTap.cancelsTouchesInView = NO; //Default value for cancelsTouchesInView is YES, which will prevent buttons to be clicked
[scrollViewName addGestureRecognizer:singlTap];

然后用指定的方法编写代码。

-(void)methodName:(UITapGestureRecognizer *)gesture
{
     //your code here
}

Answer 3

我不知道这对你有帮助吗。但请尝试将exclusiveTouch的{{1}}属性设置为UIImageView。

Answer 4

您是否将滚动视图添加为IBOutlet？如果它来自xib并且如你所说的触摸可以在滚动之外而不是在内部，我猜你可能不小心取消选中阻止触摸事件的scrollview的 userInteractionEnabled 。并且您已将UIImageViews添加为UIScrollView的子视图。对于UIImageView，您必须先将 userInteractionEnabled 设置为 YES ，然后根据需要添加任何手势以获取事件或使用 touchesBegan，touchesMoved 方法。除非您启用了交互功能，否则您将无法在UIImageView上接收触摸事件。如果父视图我的意思是UIScrollView的交互被禁用，你也不会接触到UIImageView。希望这会有所帮助：）

检测UIImage的触摸作为UIScrollView的子视图添加

4 个答案: