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UIImageView上的旋转动画

[英]Rotation Animation on UIImageView

 原文  2010-12-01 11:01:40  7   4    ios/ iphone/ animation/ uiimageview/ core-animation

问题描述

我有阳光图像。 我喜欢将其放在背景上，并使其以慢动作连续旋转。

图像是这个。

替代文字

我曾尝试使用CABasicAnimation旋转它，但它旋转了整个框架..我只希望阳光在背景而不是整个框架上旋转。

有什么办法吗？

更新：

这是我在做什么...请指出我的错误... :(

我没有你解释过的explained .. :(

这是我在做什么... 

 - (void)viewDidLoad {
sunraysContainer = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 1024, 768)];
sunraysContainer.clipsToBounds = YES;
[self.view addSubview:sunraysContainer];


sunrays = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 1024, 768)];
[sunrays setImage:[UIImage imageNamed:@"sunlight-background copy2.jpg"]];
[sunraysContainer addSubview:sunrays];

backgroundBuilding = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 1024, 768)];
[backgroundBuilding setImage:[UIImage imageNamed:@"hira-background_fade.png"]];
 [sunraysContainer addSubview:backgroundBuilding];

[UIView beginAnimations:nil context:nil];
 [UIView setAnimationDuration:5];
 CABasicAnimation *rotationAnimation;
 rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
 rotationAnimation.toValue = [NSNumber numberWithFloat:M_PI * 2.0 * 4.0];
 rotationAnimation.duration = 1;
 rotationAnimation.cumulative = YES;
 rotationAnimation.repeatCount = 10;
 rotationAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];
 [sunrays.layer addAnimation:rotationAnimation forKey:@"rotationAnimation"];
 [UIView commitAnimations];

 }

更新中...

我做了你说的玉米片...谢谢你的答复，但是我得到了黑屏.. :(

我已经编码了... 

   sunrays = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"sunlight-background copy2.jpg"]];
UIView *container = [[UIView alloc] initWithFrame:CGRectMake(0,0,sunrays.frame.size.height,sunrays.frame.size.height)];
[container setClipsToBounds:YES];
[container addSubview:sunrays];
[sunrays setCenter:CGPointMake(container.bounds.size.width/2, container.bounds.size.height/2)]; 
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:5];
CABasicAnimation *rotationAnimation;
rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
rotationAnimation.toValue = [NSNumber numberWithFloat:M_PI * 2.0 * 4.0];
rotationAnimation.duration = 1;
rotationAnimation.cumulative = YES;
rotationAnimation.repeatCount = 10;
rotationAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];
[sunrays.layer addAnimation:rotationAnimation forKey:@"rotationAnimation"];
[UIView commitAnimations];

什么是错误的代码？

4 个解决方案

解决方案1
 3  2012-10-24 13:56:34

好吧，我认为您应该生成不同的图像，然后尝试对此进行动画处理 

imgLoading.animationImages = [NSArray arrayWithObjects:
                              [UIImage imageNamed:@"Img1.png"]
                              [UIImage imageWithCGImage:
                               [self CGImageRotatedByAngle:
                                [[UIImage imageNamed:@"Img1.png"] CGImage]angle:30.0]],
                              [UIImage imageWithCGImage:
                               [self CGImageRotatedByAngle:
                                [[UIImage imageNamed:@"Img1.png"] CGImage]angle:60.0]],
                              [UIImage imageWithCGImage:
                               [self CGImageRotatedByAngle:
                                [[UIImage imageNamed:@"Img1.png"] CGImage]angle:90.0]],
                              [UIImage imageWithCGImage:
                               [self CGImageRotatedByAngle:
                                [[UIImage imageNamed:@"Img1.png"] CGImage]angle:120.0]],
                              [UIImage imageWithCGImage:
                               [self CGImageRotatedByAngle:
                                [[UIImage imageNamed:@"Img1.png"] CGImage]angle:150.0]],
                              [UIImage imageWithCGImage:
                               [self CGImageRotatedByAngle:
                                [[UIImage imageNamed:@"Img1.png"] CGImage]angle:180.0]],
                              [UIImage imageWithCGImage:
                               [self CGImageRotatedByAngle:
                                [[UIImage imageNamed:@"Img1.png"] CGImage]angle:210.0]],
                              [UIImage imageWithCGImage:
                               [self CGImageRotatedByAngle:
                                [[UIImage imageNamed:@"Img1.png"] CGImage]angle:240.0]],
                              [UIImage imageWithCGImage:
                               [self CGImageRotatedByAngle:
                                [[UIImage imageNamed:@"Img1.png"] CGImage]angle:270.0]],
                              [UIImage imageWithCGImage:
                               [self CGImageRotatedByAngle:
                                [[UIImage imageNamed:@"Img1.png"] CGImage]angle:300.0]],
                              [UIImage imageWithCGImage:
                               [self CGImageRotatedByAngle:
                                [[UIImage imageNamed:@"Img1.png"] CGImage]angle:330.0]],
                              [UIImage imageWithCGImage:
                               [self CGImageRotatedByAngle:
                                [[UIImage imageNamed:@"Img1.png"] CGImage]angle:360.0]], nil];

imgLoading.animationRepeatCount=0;
imgLoading.animationDuration=.5;
[imgLoading startAnimating];

在上面的代码中，我分别添加了图像，但是您可以循环填充它们。 

- (CGImageRef)CGImageRotatedByAngle:(CGImageRef)imgRef angle:(CGFloat)angle

{ 

CGFloat angleInRadians = angle * (M_PI / 180);
CGFloat width = CGImageGetWidth(imgRef);
CGFloat height = CGImageGetHeight(imgRef);

CGRect imgRect = CGRectMake(0, 0, width, height);
CGAffineTransform transform = CGAffineTransformMakeRotation(angleInRadians);
CGRect rotatedRect = CGRectApplyAffineTransform(imgRect, transform);

CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();

CGContextRef bmContext = CGBitmapContextCreate(NULL,
                                               rotatedRect.size.width,
                                               rotatedRect.size.height,
                                               8,
                                               0,
                                               colorSpace,
                                               kCGImageAlphaPremultipliedFirst);
CGContextSetAllowsAntialiasing(bmContext, YES);
CGContextSetShouldAntialias(bmContext, YES);
CGContextSetInterpolationQuality(bmContext, kCGInterpolationHigh);
CGColorSpaceRelease(colorSpace);
CGContextTranslateCTM(bmContext,
                      +(rotatedRect.size.width/2),
                      +(rotatedRect.size.height/2));
CGContextRotateCTM(bmContext, angleInRadians);
CGContextTranslateCTM(bmContext,
                      -(rotatedRect.size.width/2),
                      -(rotatedRect.size.height/2));
CGContextDrawImage(bmContext, CGRectMake(0, 0,
                                         rotatedRect.size.width,
                                         rotatedRect.size.height),
                   imgRef);



CGImageRef rotatedImage = CGBitmapContextCreateImage(bmContext);
CFRelease(bmContext);
[(id)rotatedImage autorelease];

return rotatedImage;

}

上述功能可用于提供旋转的图像。

解决方案2
 1  2010-12-01 11:13:32

我认为您的方法是正确的；）您必须有一个容器对其进行修剪，以免看起来像孔框架在旋转。 

UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"image.png"]];
UIView *container = [UIView alloc] initWithFrame:CGRectMake(0,0,imageView.frame.size.height, image.frame.size.height)]; //i used the height because is the min(height, width).
[container setClipsToBounds:YES];
[container addSubview:imageView];
[imageView setCenter:CGPointMake(container.bounds.size.width/2, container.bounds.size.height/2)];
//animate your image here
...

也。 如果可能，请使用CALayer代替imageView;） 

CALayer *imageLayer = [CALayer layer];
imageLayer.contents = (id)[UIImage imageNamed:@"myimage.png"].CGImage;
// and do basically the same as above,
[container.layer addSublayer:imageLayer];
//...

注意：上面的代码是经过大脑编译的，因此可能会有一些小错误，但是思路很清楚;）

希望能帮助到你

编辑：

嘿;）我想您忘了在视图中添加容器。 ;）

我刚刚尝试了代码，但我意识到容器的帧计算是不精确的（即使您不这样做也可以，但是动画看起来有点难看）这是代码： 

    UIImage *image = [UIImage imageNamed:@"sunrays.jpg"];
    UIImageView *sunrays = [[UIImageView alloc] initWithImage:image];
    float side = (MIN(image.size.height, image.size.width)/(2.0*sqrt(2)));
    UIView *container = [[UIView alloc] initWithFrame:CGRectMake(0,0,side,side)];
    [container setClipsToBounds:YES];
    [container addSubview:sunrays];
    [sunrays setCenter:CGPointMake(container.bounds.size.width/2, container.bounds.size.height/2)]; 

    [self.view addSubview:container]; //you forgot this? ;)

    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:5];
    CABasicAnimation *rotationAnimation;
    rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
    rotationAnimation.toValue = [NSNumber numberWithFloat:M_PI * 2.0 * 4.0];
    rotationAnimation.duration = 1;
    rotationAnimation.cumulative = YES;
    rotationAnimation.repeatCount = 10;
    rotationAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];
    [sunrays.layer addAnimation:rotationAnimation forKey:@"rotationAnimation"];
    [UIView commitAnimations];

解决方案3
 0  2014-01-01 04:24:41

我知道这是很旧的帖子。 一种解决方案是使图像的黄色部分透明。 您可以使用免费工具pngweasel。 使黄色部分透明-这只会产生阳光的图像。 对于该图像使用纯黄色背景。 现在，您可以使用以下代码轻松旋转新的（阳光）图像 

CABasicAnimation *rotate;
rotate = [CABasicAnimation animationWithKeyPath:@"transform.rotation"];
rotate.fromValue = [NSNumber numberWithFloat:0];
rotate.toValue = [NSNumber numberWithFloat:(0.0175*180)]; //[NSNumber numberWithFloat:deg2rad(10)];
rotate.duration = 0.5;
rotate.repeatCount = 1;
[self.image.layer addAnimation:rotate forKey:@"10"];

解决方案4
 0  2017-07-27 17:54:27

斯威夫特3： 

var rotationAnimation = CABasicAnimation()
rotationAnimation = CABasicAnimation.init(keyPath: "transform.rotation.z")
rotationAnimation.toValue = NSNumber(value: (Double.pi))
rotationAnimation.duration = 1.0
rotationAnimation.isCumulative = true
rotationAnimation.repeatCount = 100.0
imageView.layer.add(rotationAnimation, forKey: "rotationAnimation")


这是UIView的扩展功能，可处理开始和停止旋转操作： 

extension UIImageView {

    func startRotation() {
        let rotation : CABasicAnimation = CABasicAnimation(keyPath: "transform.rotation.z")
        rotation.fromValue = 0
        rotation.toValue = NSNumber(value: Double.pi)
        rotation.duration = 5.0
        rotation.isCumulative = true
        rotation.repeatCount = FLT_MAX
        self.layer.add(rotation, forKey: "rotationAnimation")
    }

    func stopRotation() {
        self.layer.removeAnimation(forKey: "rotationAnimation")
    }
}


现在使用UIView.animation闭包： 

UIView.animate(withDuration: 0.5, animations: { 
      imageView.transform = CGAffineTransform(rotationAngle: (CGFloat(Double.pi)) 
}) { (isAnimationComplete) in
    // Animation completed 
}

使用扩展名查看结果：

在此处输入图片说明

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