有没有办法复制Siri按钮发光动画?它看起来绝对华丽,但我目前不知道如何入手...是否有在线预格式化的旋转PNG文件?或者是用CoreAnimation完成的?
有没有办法复制Siri按钮发光动画?它看起来绝对华丽,但我目前不知道如何入手...是否有在线预格式化的旋转PNG文件?或者是用CoreAnimation完成的?
// create emitter layer
self.emitterLayer = [CAEmitterLayer layer];
self.emitterLayer.frame = CGRectMake(0, 0, self.view.bounds.size.width, self.view.bounds.size.height);
self.emitterLayer.emitterMode = kCAEmitterLayerOutline;
self.emitterLayer.emitterShape = kCAEmitterLayerLine;
self.emitterLayer.renderMode = kCAEmitterLayerAdditive;
[self.emitterLayer setEmitterSize:CGSizeMake(4, 4)];
// create the ball emitter cell
CAEmitterCell *ball = [CAEmitterCell emitterCell];
ball.color = [[UIColor colorWithRed:111.0/255.0 green:80.0/255.0 blue:241.0/255.0 alpha:0.10] CGColor];
ball.contents = (id)[[UIImage imageNamed:@"ball.png"] CGImage]; // ball.png is simply an image of white circle
[ball setName:@"ball"];
self.emitterLayer.emitterCells = [NSArray arrayWithObject:ball];
[self.view.layer addSublayer:self.emitterLayer];
float factor = 1.5; // you should play around with this value
[self.emitterLayer setValue:[NSNumber numberWithInt:(factor * 500)] forKeyPath:@"emitterCells.ball.birthRate"];
[self.emitterLayer setValue:[NSNumber numberWithFloat:factor * 0.25] forKeyPath:@"emitterCells.ball.lifetime"];
[self.emitterLayer setValue:[NSNumber numberWithFloat:(factor * 0.15)] forKeyPath:@"emitterCells.ball.lifetimeRange"];
// animation code
CAKeyframeAnimation* circularAnimation = [CAKeyframeAnimation animationWithKeyPath:@"emitterPosition"];
CGMutablePathRef path = CGPathCreateMutable();
CGRect pathRect = CGRectMake(0, 0, 200, 200); // define circle bounds with rectangle
CGPathAddEllipseInRect(path, NULL, pathRect);
circularAnimation.path = path;
CGPathRelease(path);
circularAnimation.duration = 2;
circularAnimation.repeatDuration = 0;
circularAnimation.repeatCount = 3;
circularAnimation.calculationMode = kCAAnimationPaced;
[self.emitterLayer addAnimation:circularAnimation forKey:@"circularAnimation"];
CAEmitterCell和CAEmitterLayer类有许多属性,因此请查阅文档获取更多信息。
- (void)viewDidLoad {
[super viewDidLoad];
NSArray * imageArray = [[NSArray alloc] initWithObjects:
[UIImage imageNamed:@"1.png"],
[UIImage imageNamed:@"2.png"],
[UIImage imageNamed:@"3.png"],
[UIImage imageNamed:@"4.png"],
[UIImage imageNamed:@"5.png"],
[UIImage imageNamed:@"6.png"],
[UIImage imageNamed:@"7.png"],
[UIImage imageNamed:@"8.png"],
[UIImage imageNamed:@"9.png"],
[UIImage imageNamed:@"10.png"],
[UIImage imageNamed:@"11.png"],
[UIImage imageNamed:@"12.png"],
nil];
UIImageView * ryuJump = [[UIImageView alloc] initWithFrame:
CGRectMake(100, 125, 150, 130)];
ryuJump.animationImages = imageArray;
ryuJump.animationDuration = 1.1;
ryuJump.contentMode = UIViewContentModeBottomLeft;
[self.view addSubview:ryuJump];
[ryuJump startAnimating];
}
来源: http://www.icodeblog.com/2009/07/24/iphone-programming-tutorial-animating-a-game-sprite/
本教程将向您展示如何使用iPhone SDK中的UIImageView和UIImage类来制作动画游戏精灵。这个教程旨在帮助那些想要进一步了解iPhone游戏开发的人。UIImageView有一个名为animationImages的属性,您可以使用它来指定一系列图像,以便按顺序播放,就像动画GIF一样。如果您想要精确控制效果,那可能是最简单的方法。
使用单个图像并使用CGAffineTransformMakeRotation(angle)动画其view.transform属性也可以通过CoreAnimation实现类似的效果。