在 iPhone 上制作无限循环的弹跳球动画的最佳方法是什么？

发布于 2024-07-25 13:29:33 字数 670 浏览 3 评论 0原文

我正在开发一款 iPhone 游戏，其中鸟类会弹跳。

我已经设置了用于为飞鸟的翅膀设置动画的图像，如下所示：

[imgBird[i] setAnimationImages:birdArrayConstant];
[imgBird[i] setAnimationDuration:1.0];
[imgBird[i] startAnimating];

现在，我如何让鸟移动是使用 NSTimer 每 0.03 秒触发一次，这会从 imgBird[i] 的 x 或 y 坐标中加/减 1 。中心。

我从这里学会了这样做。 http://icodeblog .com/2008/10/28/iphone-programming-tutorial-animating-a-ball-using-an-nstimer/

但问题是，一旦另一个计时器（用于移动我的船当我停止移动船时，以同样的方式射击并返回到原始速度。

除了 NSTimer 之外，还有更好的方法让小鸟保持移动吗？

鸟的运动是无限循环的。

原文

I am developing an iPhone game in which birds bounce.

I have set up the images for animating the wings of the flying bird like this:

[imgBird[i] setAnimationImages:birdArrayConstant];
[imgBird[i] setAnimationDuration:1.0];
[imgBird[i] startAnimating];

Now how I make the bird move is to use an NSTimer to fire every 0.03 seconds which adds/subtracts 1 from the x or y coordinate from imgBird[i].center.

I learnt about doing it like this from here. http://icodeblog.com/2008/10/28/iphone-programming-tutorial-animating-a-ball-using-an-nstimer/

But the issue is the birds slow down as soon as another timer (for moving my ship the same way) fires and returns back to original speed as i stop moving the ship.

Is there a better way to keep the bird moving except NSTimer?

The movement of bird is an infinite loop.

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吝吻 2024-08-01 13:29:34

您需要将 CoreGraphics 和 QuartzCore 框架导入到您的项目中。

将这些行添加到文件的顶部。

#import <QuartzCore/QuartzCore.h>
#import <CoreGraphics/CoreGraphics.h>

...

UIImageView *bird = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"bird2.png"]];

CALayer *b = bird.layer;

// Create a keyframe animation to follow a path to the projected point

CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"scale"];
animation.removedOnCompletion = NO;


// Create the path for the bounces
CGMutablePathRef thePath = CGPathCreateMutable();

// Start the path at my current location
CGPathMoveToPoint(thePath, NULL, bird.center.x, bird.center.y);
CGPathAddLineToPoint(thePath, NULL,20, 500.0);

/*  // very cool path system.
CGMutablePathRef thePath = CGPathCreateMutable();
CGPathMoveToPoint(thePath,NULL,74.0,74.0);

CGPathAddCurveToPoint(thePath,NULL,74.0,500.0,
                      320.0,500.0,
                      320.0,74.0);
CGPathAddCurveToPoint(thePath,NULL,320.0,500.0,
                      566.0,500.0,
                      566.0,74.0);
*/

//animation.rotationMode = kCAAnimationRotateAuto;

animation.path = thePath;

animation.speed = 0.011;
//animation.delegate = self;
animation.repeatCount = 1000000;

// Add the animation to the layer
[b addAnimation:animation forKey:@"move"];

希望有点帮助。

You will need to import CoreGraphics and the QuartzCore frameworks into you project.

Add these lines to the top of your file.

#import <QuartzCore/QuartzCore.h>
#import <CoreGraphics/CoreGraphics.h>

...

UIImageView *bird = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"bird2.png"]];

CALayer *b = bird.layer;

// Create a keyframe animation to follow a path to the projected point

CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"scale"];
animation.removedOnCompletion = NO;


// Create the path for the bounces
CGMutablePathRef thePath = CGPathCreateMutable();

// Start the path at my current location
CGPathMoveToPoint(thePath, NULL, bird.center.x, bird.center.y);
CGPathAddLineToPoint(thePath, NULL,20, 500.0);

/*  // very cool path system.
CGMutablePathRef thePath = CGPathCreateMutable();
CGPathMoveToPoint(thePath,NULL,74.0,74.0);

CGPathAddCurveToPoint(thePath,NULL,74.0,500.0,
                      320.0,500.0,
                      320.0,74.0);
CGPathAddCurveToPoint(thePath,NULL,320.0,500.0,
                      566.0,500.0,
                      566.0,74.0);
*/

//animation.rotationMode = kCAAnimationRotateAuto;

animation.path = thePath;

animation.speed = 0.011;
//animation.delegate = self;
animation.repeatCount = 1000000;

// Add the animation to the layer
[b addAnimation:animation forKey:@"move"];

Hope that helps a bit.

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断爱 2024-08-01 13:29:34

从你的问题来看，你似乎使用了多个计时器。只需使用一个即可为所有对象添加动画效果。在某个地方，当您的应用程序启动时，请执行以下操作：

[NSTimer scheduledTimerWithTimeInterval:0.03 target:self selector:@selector(mainLoop:) userInfo:nil repeats:YES];

然后，在主循环中，执行如下操作：

- (void)mainLoop:(NSTimer *)timer
{
    // compute new position for imgBirds
    for (int i=0; i<kBirdCount; i++)
    {
        imgBirds[i].center = CGPointMake(somex, somey);
    }

    // compute new position for ship
    ship.center = CGPointMake(somex, somey);
}

另外，您应该将 somex 和 somey 计算为计时器间隔的函数。这样，如果你改变它，你的动画看起来仍然是一样的。

From your question it seems you are using more than one timer. Use just one to animate all your objects. Somewhere, when your app starts, have this:

[NSTimer scheduledTimerWithTimeInterval:0.03 target:self selector:@selector(mainLoop:) userInfo:nil repeats:YES];

Then, in main loop, something like this:

- (void)mainLoop:(NSTimer *)timer
{
    // compute new position for imgBirds
    for (int i=0; i<kBirdCount; i++)
    {
        imgBirds[i].center = CGPointMake(somex, somey);
    }

    // compute new position for ship
    ship.center = CGPointMake(somex, somey);
}

Also, you should compute somex and somey as a function of your timer interval. In that way, if you change it, your animation will still look the same.

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