在ios中以编程方式单击UIImageView上的Event

Question

我从代码中显示图像是代码

UIImageView *preArrowImage =[[UIImageView alloc]init ];
preArrowImage.image =[UIImage imageNamed:@"arrowprev.png"];
preArrowImage.frame = CGRectMake(20, 60, 10, 30);
[self.view addSubview:preArrowImage];

我想以编程方式处理preArrowImage上的触摸事件。

Answer 1

Objective-c

UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapDetected)];
singleTap.numberOfTapsRequired = 1;
[preArrowImage setUserInteractionEnabled:YES];
[preArrowImage addGestureRecognizer:singleTap];

-(void)tapDetected{
    NSLog(@"single Tap on imageview");
  }

SWIFT 4.2

let preArrowImage : UIImageView // also give it frame
let singleTap = UITapGestureRecognizer(target: self, action: #selector(tapDetected))
preArrowImage.isUserInteractionEnabled = true
preArrowImage.addGestureRecognizer(singleTap)

//Action
@objc func tapDetected() {
    print("Imageview Clicked")
}

Answer 2

只需在图片上添加UITapGesture，但请记住启用 UserInteraction 。

    UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self 
    action:@selector(singleTapGestureCaptured:)];
    [preArrowImage addGestureRecognizer:singleTap];
    [preArrowImage setMultipleTouchEnabled:YES];
    [preArrowImage setUserInteractionEnabled:YES];

Answer 3

现在在Swift！

let singleTap = UITapGestureRecognizer(target: self, action: Selector("tapDetected"))
singleTap.numberOfTapsRequired = 1

preArrowImage.userInteractionEnabled = true
preArrowImage.addGestureRecognizer(singleTap)


//Action
func tapDetected() {
    println("Single Tap on imageview")
}

Answer 4

Swift 3

在 UIImageView上启用UserInterAction

 override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
        super.touchesEnded(touches, with: event)

        if let touch = touches.first {
            if touch.view == self.imgVwPostPreview { //image View property

                //Do your actions
                //self.delegate?.didClickOnCellImageView(indexPath: self.cellIndexPath!)
            }
        }
    }

Answer 5

在视图控制器中使用带有视图的故事板。

选择其中一个手势识别器后，将其拖动到控制器。
现在它将显示在＆＃34;文档大纲＆＃34;和视图控制器xib的标题。

将手势拖动到UILable

在头文件中创建IBAction方法
现在将它从处理程序拖到xib中的手势图标

Answer 6

如果你的UIImageView是一个从Storyboard或Nib获得的IBOutlet，你可以在图像视图中添加一个UIGestureRecognizer，启用用户交互并将IBAction连接到手势识别器。

有关详情，请查看我对此问题的回答：How to you make a UIImageView on the storyboard clickable (swift)

Answer 7

这是另一种选择：作弊。

我的意思是，横向思考。

按照你想要的方式设置你的UIImage，裁剪，方面适合等等。

用UIView（等尺寸，位置等）覆盖它

将背景设置为clearcolour，将类设置为UIControl。

将事件内部的触摸指向处理程序，瞧。

Answer 8

Xamarin.iOS

UIImageView preArrowImage; // also give it frame
var singleTap = new UITapGestureRecognizer(TapDetected);
singleTap.ShouldReceiveTouch -= TapGesture_ShouldReceiveTouch;
singleTap.ShouldReceiveTouch += TapGesture_ShouldReceiveTouch;
preArrowImage.UserInteractionEnabled = true;
preArrowImage.AddGestureRecognizer(singleTap)

bool TapGesture_ShouldReceiveTouch(UIGestureRecognizer recognizer, UITouch touch)
{
    return true;
}

void TapDetected(UITapGestureRecognizer tapGestureRecognizer)
{
    print("Imageview Clicked")
}