Question

我制作了一个应用程序，我想让它与多点触控兼容。我试过环顾四周，但答案并不是我特有的。这是我做的：

1）我的编码：

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

[self touchesMoved:touches withEvent:event];
if (gameState == kGameStatePaused) {(gameState = kGameStateRunning);}
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
if(gameState == kGameStateRunning) {

    UITouch *touch = [[event allTouches] anyObject];
    CGPoint location = [touch locationInView:touch.view];
    if(location.x > 400) {

        CGPoint yLocation = CGPointMake(playerPaddle.center.x, location.y);
        playerPaddle.center = yLocation;
    }

    if (gameStyle == kGameStyleTwoP) {
        if(location.x < 100) {

            CGPoint yLocation2 = CGPointMake(computerPaddle.center.x, location.y);
            computerPaddle.center = yLocation2;
        }
    }
}

2）我已经进入Interface Builder并选中了启用多点触控的方框

3）我构建并运行我的应用程序，它正常打开，当我去测试多点触控时，我按住“选项键”并单击并移动鼠标

4）（我试图让computerPaddle和playerPaddle都移动）但是一次只能做一件作品

我必须尝试修复它，但我无法理解我哪里出错了。

任何帮助都很有用。 THX。

Answer 1

UIView上有一个名为multipleTouchEnabled的属性，您可以将其设置为YES以启用它（默认为NO）。

此外，您应该循环处理touches中收到的touchesMoved集中的所有触摸。

Answer 2

看这一行

UITouch *touch = [[event allTouches] anyObject];

你只需要一次触摸并忽略休息，这就是为什么只有一件事可以移动

所以用for循环替换应该解决问题

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
if(gameState == kGameStateRunning) {

    for (UITouch *touch in [event allTouches]) {
    CGPoint location = [touch locationInView:touch.view];
    if(location.x > 400) {

        CGPoint yLocation = CGPointMake(playerPaddle.center.x, location.y);
        playerPaddle.center = yLocation;
    }

    if (gameStyle == kGameStyleTwoP) {
        if(location.x < 100) {

            CGPoint yLocation2 = CGPointMake(computerPaddle.center.x, location.y);
            computerPaddle.center = yLocation2;
        }
    }
}
}

如何使多点触控启用ios应用程序

2 个答案: