Question

是否可以获得触摸的x和y坐标？如果是这样，请有人提供一个非常简单的示例，其中坐标刚刚记录到控制台。

Answer 1

使用touchesBegan事件

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [[event allTouches] anyObject];
    CGPoint touchPoint = [touch locationInView:self.view];
    NSLog(@"Touch x : %f y : %f", touchPoint.x, touchPoint.y);
}

触摸开始时会触发此事件。

使用手势

在viewDidLoad:方法

中注册您的UITapGestureRecognizer

- (void)viewDidLoad {
    [super viewDidLoad];
    UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapGestureRecognizer:)];
    [self.view setUserInteractionEnabled:YES];
    [self.view addGestureRecognizer:tapGesture];
}

设置tapGestureRecognizer功能

// Tap GestureRecognizer function
- (void)tapGestureRecognizer:(UIGestureRecognizer *)recognizer {
    CGPoint tappedPoint = [recognizer locationInView:self.view];
    CGFloat xCoordinate = tappedPoint.x;
    CGFloat yCoordinate = tappedPoint.y;

    NSLog(@"Touch Using UITapGestureRecognizer x : %f y : %f", xCoordinate, yCoordinate);
}

Sample Project

Answer 2

首先，您需要为所需的视图添加手势识别器。

UITapGestureRecognizer *myTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(myTapRecognizer:)];
[self.myView setUserInteractionEnabled:YES];
[self.myView addGestureRecognizer:myTap];

然后在手势识别器方法中，您可以拨打locationInView:

- (void)myTapRecognizer:(UIGestureRecognizer *)recognizer
{
    CGPoint tappedPoint = [recognizer locationInView:self.myView];
    CGFloat xCoordinate = tappedPoint.x;
    CGFloat yCoordinate = tappedPoint.y;
}

你可能想看看苹果的UIGestureRecognizer Class Reference

Answer 3

这是一个非常基本的示例（将其置于视图控制器中）：

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [touches anyObject];
    CGPoint currentPoint = [touch locationInView:self.view];
    NSLog(@"%@", NSStringFromCGPoint(currentPoint));
}

每次触摸移动时都会触发。您还可以使用触摸开始时触发的touchesBegan:withEvent:和触摸结束时触发的touchesEnded:withEvent:（即手指抬起）。

您也可以使用UIGestureRecognizer执行此操作，这在许多情况下更实用。

是否可以获得触摸的x和y坐标？

3 个答案: