Question

在我目前的ios项目中，我将屏幕的一侧专用于一个对象，屏幕的另一侧专用于另一个对象，我已将其设置为如果您在屏幕的一侧滑过手指指定的对象会移动。但是，我想做到这一点，你可以在不同的运动中同时移动两个对象，但我无法弄清楚如何这样做。以下是我目前的代码。

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [[event allTouches] anyObject];
    CGPoint location = [touch locationInView:touch.view];

    if (location.x <= 270 ) {
        [Person setCenter:CGPointMake(location.x, Person.center.y)];

    }
    else  {
        [Person1 setCenter:CGPointMake(location.x, Person1.center.y)];
    }
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [[event allTouches] anyObject];
    CGPoint location = [touch locationInView:touch.view];

    if (location.x <= 270 ) {
        [Person setCenter:CGPointMake(location.x, Person.center.y)];
    }
    else  {
        [Person1 setCenter:CGPointMake(location.x, Person1.center.y)];
    }
}

Answer 1

你应该开始处理touches集合中提供的多个触摸 - 循环遍历所有UITouch个对象并进行处理。

编辑：这是你的代码：

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    for(UITouch *touch in [event allTouches]) {
        CGPoint location = [touch locationInView:touch.view];

        if (location.x <= 270 ) {
            [Person setCenter:CGPointMake(location.x, Person.center.y)];
        }
        else  {
            [Person1 setCenter:CGPointMake(location.x, Person1.center.y)];
        }
    }
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    for(UITouch *touch in [event allTouches]) {
        CGPoint location = [touch locationInView:touch.view];

        if (location.x <= 270 ) {
            [Person setCenter:CGPointMake(location.x, Person.center.y)];
        }
        else  {
            [Person1 setCenter:CGPointMake(location.x, Person1.center.y)];
        }
    }
}

Answer 2

如果你移动-touchesBegan＆amp; touchesMoved代码到Person视图类而不是它当前所在的view /或viewController类，然后这些视图可以处理彼此独立且同时处理的触摸。

*编辑：更多信息：目前，您正在使用上面粘贴的代码处理触摸事件（在我猜测UIViewController），如果您将该代码移动到您创建的Person类中，您可以使代码更简单并获得您想要的结果。这将导致人员决定是否被触摸以及相应地移动自己。

在Person.m文件中添加此代码

 -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    UITouch *touch = [[event allTouches] anyObject];
    CGPoint location = [touch locationInView:self.superview];
    [self moveToLocation:location];
}

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
    UITouch *touch = [[event allTouches] anyObject];
    CGPoint location = [touch locationInView:self.superview];
    [self moveToLocation:location];
}

-(void)moveToLocation:(CGPoint)location{
    CGFloat halfOfPersonWidth = self.bounds.size.width /2.0f;
    CGFloat halfOfSuperviewWidth = self.superview.bounds.size.width/2.0f;

    // Stop Person from going off left screen edge
    if ((location.x - halfOfPersonWidth) <= 0.0f){
        return;
    } // Stop Person from going off right screen edge
    else if ((location.x + halfOfPersonWidth) >= self.superview.bounds.size.width){
        return;
    }

    if (self.center.x < halfOfSuperviewWidth) {
        // Person is on the left of the screen and should not move to right side
        if ((location.x + halfOfPersonWidth) > halfOfSuperviewWidth) {
             return;
        }
    } else{
        // Person is on the right of the screen and should not move to left side
        if ((location.x - halfOfPersonWidth) < halfOfSuperviewWidth) {
            return;
        }
    }
    // If we have made it this far then we can move the Person
    // move to touch location on x axis only
    [self setCenter:CGPointMake(location.x, self.center.y)];
    }

现在，在View Controller类中，您可以删除原始-touchesBegan＆amp; -touchesMoved你在这里粘贴的代码，或者如果你想谨慎就把它评论出来

 /* put slash asterisks above the code and asterisks slash below the code to comment out */

如果您构建并运行，您应该能够像以前一样移动每个Person视图，但如果您同时将手指放在每个Person视图上，您应该能够同时移动它们。

同时移动2个物体

2 个答案: