Question

我正在使用Xcode for iOS制作游戏。这是我所拥有的一段代码，可以在点击屏幕时跳过精灵：

//tap/touch to jump (& play sound)
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *) event{
       [self playSound];
       jumpUp = 16;
}

我怎样才能实现它，以便精灵不断上升而你只是轻触屏幕而不是一次点击？

//Pseudo code:
while touchingScreen {
    jumpUp +=1;
}

Answer 1

你需要在触摸持续时运行的touchesBegan中启动某种循环。然后在touchesEnded（并取消！）使该循环停止。您可以使用重复的NSTimer或类似以下内容。您可能需要进行一些调整，以使游戏更加流畅。

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    [super touchesBegan:touches withEvent:event];

    // touching is a BOOL that keeps track of the touch event
    // YES means that a touch is happening at the moment
    touching = YES;
    dispatch_async(dispatch_get_main_queue(), ^{
        [self performSelector:@selector(up) withObject:nil afterDelay:.0];
    });
}

- (void)up {
    // move your sprite further up
    NSLog(@"up");
    if (touching) {
        // if the user is still touching repeat moving the sprite up
        [self performSelector:@selector(up) withObject:nil afterDelay:0.1];
    }
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    [super touchesEnded:touches withEvent:event];
    // The finger was lifted, stop the up movement
    touching = NO;
}

- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
{
    [super touchesCancelled:touches withEvent:event];
    touching = NO;
}

方法＆＃39; while＆＃39;触摸屏

1 个答案: