iphone - 如何制作启用多点触控的ios应用

Question

我做了一个应用程序，我想使其兼容多点触控。我曾尝试环顾四周，但答案并非特定于我。
这是我的工作:

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摸的复选框

3)我构建并运行我的应用程序，它会正确打开，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)(我正在尝试使computerPaddle和playerPaddle都移动)，但一次只能进行一项操作

我必须尝试修复它，但我不明白我要去哪里。

任何帮助都是有用的。
谢谢。

Answer 1

看这条线

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

您只需要轻轻一按，就忽略休息，这就是为什么只有一件事可以移动的原因

所以用for循环替换应该可以解决问题

- (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;
        }
    }
}
}