我正在尝试旋转UIImageView 360度，并在线查看了几个教程。 UIView停止或跳到新位置，我就无法工作。
我尝试过的最新事情是：
[UIView animateWithDuration:1.0
delay:0.0
options:0
animations:^{
imageToMove.transform = CGAffineTransformMakeRotation(M_PI);
}
completion:^(BOOL finished){
NSLog(@"Done!");
}];
但是如果我使用2 * pi，它根本不会移动（因为它是相同的位置）。如果我尝试只做pi（180度），它可以工作，但如果我再次调用该方法，它会向后旋转。
修改：
[UIView animateWithDuration:1.0
delay:0.0
options:0
animations:^{
[UIView setAnimationRepeatCount:HUGE_VALF];
[UIView setAnimationBeginsFromCurrentState:YES];
imageToMove.transform = CGAffineTransformMakeRotation(M_PI);
}
completion:^(BOOL finished){
NSLog(@"Done!");
}];
也不起作用。它会转到180度，暂停一会儿，然后重新开始重新调整为0度。
答案 0 :(得分：328)
找到了一个方法（我修改了一下），对我来说非常有效：iphone UIImageView rotation
#import <QuartzCore/QuartzCore.h>
- (void) runSpinAnimationOnView:(UIView*)view duration:(CGFloat)duration rotations:(CGFloat)rotations repeat:(float)repeat {
CABasicAnimation* rotationAnimation;
rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
rotationAnimation.toValue = [NSNumber numberWithFloat: M_PI * 2.0 /* full rotation*/ * rotations * duration ];
rotationAnimation.duration = duration;
rotationAnimation.cumulative = YES;
rotationAnimation.repeatCount = repeat ? HUGE_VALF : 0;
[view.layer addAnimation:rotationAnimation forKey:@"rotationAnimation"];
}
答案 1 :(得分：107)
感谢Richard J. Ross III的想法，但我发现他的代码并不是我所需要的。我相信options的默认值是给你UIViewAnimationOptionCurveEaseInOut，它在连续动画中看起来不正确。另外，我添加了一张支票，这样如果我需要（不是无限，但是无限期持续时间），我可以在偶数四分之一圈停止动画，并进行加速斜坡在前90度期间上升，在最后90度期间减速（在请求停止后）：
// an ivar for your class:
BOOL animating;
- (void)spinWithOptions:(UIViewAnimationOptions)options {
// this spin completes 360 degrees every 2 seconds
[UIView animateWithDuration:0.5
delay:0
options:options
animations:^{
self.imageToMove.transform = CGAffineTransformRotate(imageToMove.transform, M_PI / 2);
}
completion:^(BOOL finished) {
if (finished) {
if (animating) {
// if flag still set, keep spinning with constant speed
[self spinWithOptions: UIViewAnimationOptionCurveLinear];
} else if (options != UIViewAnimationOptionCurveEaseOut) {
// one last spin, with deceleration
[self spinWithOptions: UIViewAnimationOptionCurveEaseOut];
}
}
}];
}
- (void)startSpin {
if (!animating) {
animating = YES;
[self spinWithOptions: UIViewAnimationOptionCurveEaseIn];
}
}
- (void)stopSpin {
// set the flag to stop spinning after one last 90 degree increment
animating = NO;
}
我添加了处理再次开始旋转的请求的能力（startSpin），而之前的旋转正在逐渐减少（完成）。示例项目here on Github。
答案 2 :(得分：67)
在Swift中，您可以使用以下代码进行无限循环：
extension UIView {
private static let kRotationAnimationKey = "rotationanimationkey"
func rotate(duration: Double = 1) {
if layer.animation(forKey: UIView.kRotationAnimationKey) == nil {
let rotationAnimation = CABasicAnimation(keyPath: "transform.rotation")
rotationAnimation.fromValue = 0.0
rotationAnimation.toValue = Float.pi * 2.0
rotationAnimation.duration = duration
rotationAnimation.repeatCount = Float.infinity
layer.add(rotationAnimation, forKey: UIView.kRotationAnimationKey)
}
}
func stopRotating() {
if layer.animation(forKey: UIView.kRotationAnimationKey) != nil {
layer.removeAnimation(forKey: UIView.kRotationAnimationKey)
}
}
}
let kRotationAnimationKey = "com.myapplication.rotationanimationkey" // Any key
func rotateView(view: UIView, duration: Double = 1) {
if view.layer.animationForKey(kRotationAnimationKey) == nil {
let rotationAnimation = CABasicAnimation(keyPath: "transform.rotation")
rotationAnimation.fromValue = 0.0
rotationAnimation.toValue = Float(M_PI * 2.0)
rotationAnimation.duration = duration
rotationAnimation.repeatCount = Float.infinity
view.layer.addAnimation(rotationAnimation, forKey: kRotationAnimationKey)
}
}
停止就像：
func stopRotatingView(view: UIView) {
if view.layer.animationForKey(kRotationAnimationKey) != nil {
view.layer.removeAnimationForKey(kRotationAnimationKey)
}
}
答案 3 :(得分：65)
Nate的上述答案非常适合停止和开始动画并提供更好的控制。我很好奇你为什么不工作而他的确如此。我想在这里分享我的发现和一个更简单的代码版本，它可以连续动画UIView而不会拖延。
这是我使用的代码，
- (void)rotateImageView
{
[UIView animateWithDuration:1 delay:0 options:UIViewAnimationOptionCurveLinear animations:^{
[self.imageView setTransform:CGAffineTransformRotate(self.imageView.transform, M_PI_2)];
}completion:^(BOOL finished){
if (finished) {
[self rotateImageView];
}
}];
}
我使用'CGAffineTransformRotate'而不是'CGAffineTransformMakeRotation'，因为前者返回在动画进行时保存的结果。这样可以防止在动画过程中跳转或重置视图。
另一件事是不使用'UIViewAnimationOptionRepeat'，因为在动画开始重复之前，它会重置变换，使视图跳回到原始位置。您可以递归而不是重复，以便永远不会将变换重置为原始值，因为动画块实际上永远不会结束。
最后一点是，你必须以90度（M_PI / 2）而不是360度或180度（2 * M_PI或M_PI）的步长变换视图。因为变换是正弦和余弦值的矩阵乘法。
t' = [ cos(angle) sin(angle) -sin(angle) cos(angle) 0 0 ] * t
所以，如果你使用180度变换，180的余弦产生-1，每次都使视图反向相反（如果你将变换的弧度值改为M_PI，Note-Nate的答案也会有这个问题）。 360度转换只是要求视图保持原样，因此您根本看不到任何旋转。
答案 4 :(得分：21)
如果你想做的只是无休止地旋转图像，这很有效，而且非常简单：
NSTimeInterval duration = 10.0f;
CGFloat angle = M_PI / 2.0f;
CGAffineTransform rotateTransform = CGAffineTransformRotate(imageView.transform, angle);
[UIView animateWithDuration:duration delay:0 options:UIViewAnimationOptionRepeat| UIViewAnimationOptionCurveLinear animations:^{
imageView.transform = rotateTransform;
} completion:nil];
根据我的经验，这可以完美地工作，但请确保您的图像能够在没有任何偏移的情况下围绕其中心旋转，或者图像动画一旦到达PI就会“跳跃”。
要更改旋转的方向，请更改angle（angle *= -1）的符号。
更新 @AlexPretzlav的评论让我重新审视了这一点，我意识到当我写这篇文章时，我正在旋转的图像沿着垂直轴和水平轴镜像，这意味着图像确实只是旋转90度，然后重置，虽然看起来就像它继续一直旋转一样。
因此，如果您的图像与我的图像相似，则效果会很好，但是，如果图像不对称，则会在90度后注意到“捕捉”回原始方向。
要旋转非对称图像，最好使用接受的答案。
如下所示，这些不太优雅的解决方案之一将真正旋转图像，但重新启动动画时可能会出现明显的卡顿：
- (void)spin
{
NSTimeInterval duration = 0.5f;
CGFloat angle = M_PI_2;
CGAffineTransform rotateTransform = CGAffineTransformRotate(self.imageView.transform, angle);
[UIView animateWithDuration:duration delay:0 options:UIViewAnimationOptionCurveLinear animations:^{
self.imageView.transform = rotateTransform;
} completion:^(BOOL finished) {
[self spin];
}];
}
正如@ richard-j-ross-iii建议的那样，您也可以使用块来执行此操作，但是由于块正在捕获自身，因此您将收到保留循环警告：
__block void(^spin)() = ^{
NSTimeInterval duration = 0.5f;
CGFloat angle = M_PI_2;
CGAffineTransform rotateTransform = CGAffineTransformRotate(self.imageView.transform, angle);
[UIView animateWithDuration:duration delay:0 options:UIViewAnimationOptionCurveLinear animations:^{
self.imageView.transform = rotateTransform;
} completion:^(BOOL finished) {
spin();
}];
};
spin();
答案 5 :(得分：20)
我对已检查解决方案中的Swift扩展的贡献：
Swift 4.0
extension UIView{
func rotate() {
let rotation : CABasicAnimation = CABasicAnimation(keyPath: "transform.rotation.z")
rotation.toValue = NSNumber(value: Double.pi * 2)
rotation.duration = 1
rotation.isCumulative = true
rotation.repeatCount = Float.greatestFiniteMagnitude
self.layer.add(rotation, forKey: "rotationAnimation")
}
}
已弃用：
extension UIView{
func rotate() {
let rotation : CABasicAnimation = CABasicAnimation(keyPath: "transform.rotation.z")
rotation.toValue = NSNumber(double: M_PI * 2)
rotation.duration = 1
rotation.cumulative = true
rotation.repeatCount = FLT_MAX
self.layer.addAnimation(rotation, forKey: "rotationAnimation")
}
}
答案 6 :(得分：10)
使用四分之一圈，并逐渐增加转弯。
void (^block)() = ^{
imageToMove.transform = CGAffineTransformRotate(imageToMove.transform, M_PI / 2);
}
void (^completion)(BOOL) = ^(BOOL finished){
[UIView animateWithDuration:1.0
delay:0.0
options:0
animations:block
completion:completion];
}
completion(YES);
答案 7 :(得分：10)
这对我有用：
[UIView animateWithDuration:1.0
animations:^
{
self.imageView.transform = CGAffineTransformMakeRotation(M_PI);
self.imageView.transform = CGAffineTransformMakeRotation(0);
}];
答案 8 :(得分：9)
我在repository，
中找到了很好的代码以下是我的代码，根据我对速度的需求，我做了一些小改动：）
<强>的UIImageView + Rotate.h
#import <Foundation/Foundation.h>
@interface UIImageView (Rotate)
- (void)rotate360WithDuration:(CGFloat)duration repeatCount:(float)repeatCount;
- (void)pauseAnimations;
- (void)resumeAnimations;
- (void)stopAllAnimations;
@end
<强>的UIImageView + Rotate.m
#import <QuartzCore/QuartzCore.h>
#import "UIImageView+Rotate.h"
@implementation UIImageView (Rotate)
- (void)rotate360WithDuration:(CGFloat)duration repeatCount:(float)repeatCount
{
CABasicAnimation *fullRotation;
fullRotation = [CABasicAnimation animationWithKeyPath:@"transform.rotation"];
fullRotation.fromValue = [NSNumber numberWithFloat:0];
//fullRotation.toValue = [NSNumber numberWithFloat:(2*M_PI)];
fullRotation.toValue = [NSNumber numberWithFloat:-(2*M_PI)]; // added this minus sign as i want to rotate it to anticlockwise
fullRotation.duration = duration;
fullRotation.speed = 2.0f; // Changed rotation speed
if (repeatCount == 0)
fullRotation.repeatCount = MAXFLOAT;
else
fullRotation.repeatCount = repeatCount;
[self.layer addAnimation:fullRotation forKey:@"360"];
}
//Not using this methods :)
- (void)stopAllAnimations
{
[self.layer removeAllAnimations];
};
- (void)pauseAnimations
{
[self pauseLayer:self.layer];
}
- (void)resumeAnimations
{
[self resumeLayer:self.layer];
}
- (void)pauseLayer:(CALayer *)layer
{
CFTimeInterval pausedTime = [layer convertTime:CACurrentMediaTime() fromLayer:nil];
layer.speed = 0.0;
layer.timeOffset = pausedTime;
}
- (void)resumeLayer:(CALayer *)layer
{
CFTimeInterval pausedTime = [layer timeOffset];
layer.speed = 1.0;
layer.timeOffset = 0.0;
layer.beginTime = 0.0;
CFTimeInterval timeSincePause = [layer convertTime:CACurrentMediaTime() fromLayer:nil] - pausedTime;
layer.beginTime = timeSincePause;
}
@end
答案 9 :(得分：9)
Swift3版本：
extension UIView {
func startRotate() {
let rotation : CABasicAnimation = CABasicAnimation(keyPath: "transform.rotation.z")
rotation.fromValue = 0
rotation.toValue = NSNumber(value: M_PI * 2)
rotation.duration = 2
rotation.isCumulative = true
rotation.repeatCount = FLT_MAX
self.layer.add(rotation, forKey: "rotationAnimation")
}
func stopRotate() {
self.layer.removeAnimation(forKey: "rotationAnimation")
}
}
请记得在startRotate中拨打viewWillAppear而不是viewDidLoad。
答案 10 :(得分：9)
这是我作为UIView扩展的快速解决方案。它可以被视为在任何UIImageView上模拟UIActivityIndicator行为。
import UIKit
extension UIView
{
/**
Starts rotating the view around Z axis.
@param duration Duration of one full 360 degrees rotation. One second is default.
@param repeatCount How many times the spin should be done. If not provided, the view will spin forever.
@param clockwise Direction of the rotation. Default is clockwise (true).
*/
func startZRotation(duration duration: CFTimeInterval = 1, repeatCount: Float = Float.infinity, clockwise: Bool = true)
{
if self.layer.animationForKey("transform.rotation.z") != nil {
return
}
let animation = CABasicAnimation(keyPath: "transform.rotation.z")
let direction = clockwise ? 1.0 : -1.0
animation.toValue = NSNumber(double: M_PI * 2 * direction)
animation.duration = duration
animation.cumulative = true
animation.repeatCount = repeatCount
self.layer.addAnimation(animation, forKey:"transform.rotation.z")
}
/// Stop rotating the view around Z axis.
func stopZRotation()
{
self.layer.removeAnimationForKey("transform.rotation.z")
}
}
答案 11 :(得分：8)
David Rysanek的精彩回答更新为 Swift 4 ：
import UIKit
extension UIView {
func startRotating(duration: CFTimeInterval = 3, repeatCount: Float = Float.infinity, clockwise: Bool = true) {
if self.layer.animation(forKey: "transform.rotation.z") != nil {
return
}
let animation = CABasicAnimation(keyPath: "transform.rotation.z")
let direction = clockwise ? 1.0 : -1.0
animation.toValue = NSNumber(value: .pi * 2 * direction)
animation.duration = duration
animation.isCumulative = true
animation.repeatCount = repeatCount
self.layer.add(animation, forKey:"transform.rotation.z")
}
func stopRotating() {
self.layer.removeAnimation(forKey: "transform.rotation.z")
}
}
}
答案 12 :(得分：3)
您还可以使用UIView和块执行相同类型的动画。这是一个类扩展方法，可以以任何角度旋转视图。
- (void)rotationWithDuration:(NSTimeInterval)duration angle:(CGFloat)angle options:(UIViewAnimationOptions)options
{
// Repeat a quarter rotation as many times as needed to complete the full rotation
CGFloat sign = angle > 0 ? 1 : -1;
__block NSUInteger numberRepeats = floorf(fabsf(angle) / M_PI_2);
CGFloat quarterDuration = duration * M_PI_2 / fabs(angle);
CGFloat lastRotation = angle - sign * numberRepeats * M_PI_2;
CGFloat lastDuration = duration - quarterDuration * numberRepeats;
__block UIViewAnimationOptions startOptions = UIViewAnimationOptionBeginFromCurrentState;
UIViewAnimationOptions endOptions = UIViewAnimationOptionBeginFromCurrentState;
if (options & UIViewAnimationOptionCurveEaseIn || options == UIViewAnimationOptionCurveEaseInOut) {
startOptions |= UIViewAnimationOptionCurveEaseIn;
} else {
startOptions |= UIViewAnimationOptionCurveLinear;
}
if (options & UIViewAnimationOptionCurveEaseOut || options == UIViewAnimationOptionCurveEaseInOut) {
endOptions |= UIViewAnimationOptionCurveEaseOut;
} else {
endOptions |= UIViewAnimationOptionCurveLinear;
}
void (^lastRotationBlock)(void) = ^ {
[UIView animateWithDuration:lastDuration
delay:0
options:endOptions
animations:^{
self.transform = CGAffineTransformRotate(self.transform, lastRotation);
}
completion:^(BOOL finished) {
NSLog(@"Animation completed");
}
];
};
if (numberRepeats) {
__block void (^quarterSpinningBlock)(void) = ^{
[UIView animateWithDuration:quarterDuration
delay:0
options:startOptions
animations:^{
self.transform = CGAffineTransformRotate(self.transform, M_PI_2);
numberRepeats--;
}
completion:^(BOOL finished) {
if (numberRepeats > 0) {
startOptions = UIViewAnimationOptionBeginFromCurrentState | UIViewAnimationOptionCurveLinear;
quarterSpinningBlock();
} else {
lastRotationBlock();
}NSLog(@"Animation completed");
}
];
};
quarterSpinningBlock();
} else {
lastRotationBlock();
}
}
答案 13 :(得分：3)
如果有人想要nates＆＃39;解决方案，但在迅速，然后这是一个粗略的快速翻译：
class SomeClass: UIViewController {
var animating : Bool = false
@IBOutlet weak var activityIndicatorImage: UIImageView!
func startSpinning() {
if(!animating) {
animating = true;
spinWithOptions(UIViewAnimationOptions.CurveEaseIn);
}
}
func stopSpinning() {
animating = false
}
func spinWithOptions(options: UIViewAnimationOptions) {
UIView.animateWithDuration(0.5, delay: 0.0, options: options, animations: { () -> Void in
let val : CGFloat = CGFloat((M_PI / Double(2.0)));
self.activityIndicatorImage.transform = CGAffineTransformRotate(self.activityIndicatorImage.transform,val)
}) { (finished: Bool) -> Void in
if(finished) {
if(self.animating){
self.spinWithOptions(UIViewAnimationOptions.CurveLinear)
} else if (options != UIViewAnimationOptions.CurveEaseOut) {
self.spinWithOptions(UIViewAnimationOptions.CurveEaseOut)
}
}
}
}
override func viewDidLoad() {
startSpinning()
}
}
答案 14 :(得分：3)
for xamarin ios：
public static void RotateAnimation (this UIView view, float duration=1, float rotations=1, float repeat=int.MaxValue)
{
var rotationAnimation = CABasicAnimation.FromKeyPath ("transform.rotation.z");
rotationAnimation.To = new NSNumber (Math.PI * 2.0 /* full rotation*/ * 1 * 1);
rotationAnimation.Duration = 1;
rotationAnimation.Cumulative = true;
rotationAnimation.RepeatCount = int.MaxValue;
rotationAnimation.RemovedOnCompletion = false;
view.Layer.AddAnimation (rotationAnimation, "rotationAnimation");
}
答案 15 :(得分：2)
这就是我向正确方向旋转360的方式。
[UIView animateWithDuration:1.0f delay:0.0f options:UIViewAnimationOptionRepeat|UIViewAnimationOptionCurveLinear
animations:^{
[imageIndView setTransform:CGAffineTransformRotate([imageIndView transform], M_PI-0.00001f)];
} completion:nil];
答案 16 :(得分：2)
使用UIView执行360度动画有以下不同方法。
使用 CABasicAnimation
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
view.layer.add(rotationAnimation, forKey: "rotationAnimation")
这是UIView的扩展函数，用于处理start＆amp;停止旋转操作：
extension UIView {
// Start rotation
func startRotation() {
let rotation = CABasicAnimation(keyPath: "transform.rotation.z")
rotation.fromValue = 0
rotation.toValue = NSNumber(value: Double.pi)
rotation.duration = 1.0
rotation.isCumulative = true
rotation.repeatCount = FLT_MAX
self.layer.add(rotation, forKey: "rotationAnimation")
}
// Stop rotation
func stopRotation() {
self.layer.removeAnimation(forKey: "rotationAnimation")
}
}
现在使用 UIView.animation 关闭：
UIView.animate(withDuration: 0.5, animations: {
view.transform = CGAffineTransform(rotationAngle: (CGFloat(Double.pi))
}) { (isAnimationComplete) in
// Animation completed
}
答案 17 :(得分：2)
Swift 4.0
func rotateImageView()
{
UIView.animate(withDuration: 0.3, delay: 0, options: .curveLinear, animations: {() -> Void in
self.imageView.transform = self.imageView.transform.rotated(by: .pi / 2)
}, completion: {(_ finished: Bool) -> Void in
if finished {
rotateImageView()
}
})
}
答案 18 :(得分：2)
制作动画
- (CABasicAnimation *)spinAnimationWithDuration:(CGFloat)duration clockwise:(BOOL)clockwise repeat:(BOOL)repeats
{
CABasicAnimation *anim = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
anim.toValue = clockwise ? @(M_PI * 2.0) : @(M_PI * -2.0);
anim.duration = duration;
anim.cumulative = YES;
anim.repeatCount = repeats ? CGFLOAT_MAX : 0;
return anim;
}
将其添加到此类视图中
CABasicAnimation *animation = [self spinAnimationWithDuration:1.0 clockwise:YES repeat:YES];
[self.spinningView.layer addAnimation:animation forKey:@"rotationAnimation"];
这个答案有何不同？如果大多数函数返回对象而不是仅仅操作某些对象，那么您将获得更清晰的代码。
答案 19 :(得分：2)
@ ram的answer真有帮助。这是答案的Swift版本。
private func rotateImageView() {
UIView.animateWithDuration(1, delay: 0, options: UIViewAnimationOptions.CurveLinear, animations: { () -> Void in
self.imageView.transform = CGAffineTransformRotate(self.imageView.transform, CGFloat(M_PI_2))
}) { (finished) -> Void in
if finished {
self.rotateImageView()
}
}
}
答案 20 :(得分：1)
我开发了一个闪亮的动画框架，可以为您节省时间！ 使用它可以很容易地创建这个动画：
private var endlessRotater: EndlessAnimator!
override func viewDidAppear(animated: Bool)
{
super.viewDidAppear(animated)
let rotationAnimation = AdditiveRotateAnimator(M_PI).to(targetView).duration(2.0).baseAnimation(.CurveLinear)
endlessRotater = EndlessAnimator(rotationAnimation)
endlessRotater.animate()
}
要停止此动画，只需将nil设置为endlessRotater。
如果您有兴趣，请查看：https://github.com/hip4yes/Animatics
答案 21 :(得分：1)
Swift 4 ，
func rotateImage(image: UIImageView) {
UIView.animate(withDuration: 1, animations: {
image.transform = CGAffineTransform(rotationAngle: CGFloat.pi)
image.transform = CGAffineTransform.identity
}) { (completed) in
self.rotateImage()
}
}
答案 22 :(得分：0)
使用关键帧动画Swift 5 UIView扩展
这种方法使我们可以直接使用UIView.AnimationOptions.repeat
public extension UIView {
func animateRotation(duration: TimeInterval, repeat: Bool, completion: ((Bool) -> ())?) {
var options = UIView.KeyframeAnimationOptions(rawValue: UIView.AnimationOptions.curveLinear.rawValue)
if `repeat` {
options.insert(.repeat)
}
UIView.animateKeyframes(withDuration: duration, delay: 0, options: options, animations: {
UIView.addKeyframe(withRelativeStartTime: 0, relativeDuration: 0.25, animations: {
self.transform = CGAffineTransform(rotationAngle: CGFloat.pi/2)
})
UIView.addKeyframe(withRelativeStartTime: 0.25, relativeDuration: 0.25, animations: {
self.transform = CGAffineTransform(rotationAngle: CGFloat.pi)
})
UIView.addKeyframe(withRelativeStartTime: 0.5, relativeDuration: 0.25, animations: {
self.transform = CGAffineTransform(rotationAngle: 3*CGFloat.pi/2)
})
UIView.addKeyframe(withRelativeStartTime: 0.75, relativeDuration: 0.25, animations: {
self.transform = CGAffineTransform(rotationAngle: 2*CGFloat.pi)
})
}, completion: completion)
}
}
答案 23 :(得分：0)
let val = CGFloat(M_PI_2)
UIView.animate(withDuration: 1, delay: 0, options: [.repeat, .curveLinear], animations: {
self.viewToRotate.transform = self.viewToRotate.transform.rotated(by: val)
})
答案 24 :(得分：0)
斯威夫特3：
var rotationAnimation = CABasicAnimation()
rotationAnimation = CABasicAnimation.init(keyPath: "transform.rotation.z")
rotationAnimation.toValue = NSNumber(value: (M_PI * 2.0))
rotationAnimation.duration = 2.0
rotationAnimation.isCumulative = true
rotationAnimation.repeatCount = 10.0
view.layer.add(rotationAnimation, forKey: "rotationAnimation")
答案 25 :(得分：0)
斯威夫特：
func runSpinAnimationOnView(view:UIView , duration:Float, rotations:Double, repeatt:Float ) ->()
{
let rotationAnimation=CABasicAnimation();
rotationAnimation.keyPath="transform.rotation.z"
let toValue = M_PI * 2.0 * rotations ;
// passing it a float
let someInterval = CFTimeInterval(duration)
rotationAnimation.toValue=toValue;
rotationAnimation.duration=someInterval;
rotationAnimation.cumulative=true;
rotationAnimation.repeatCount=repeatt;
view.layer.addAnimation(rotationAnimation, forKey: "rotationAnimation")
}
答案 26 :(得分：-1)
我认为您最好添加UIVIew类别：
#import <QuartzCore/QuartzCore.h>
#import "UIView+Rotate.h"
(void)remrotate360WithDuration:(CGFloat)duration repeatCount: (float)repeatCount
{
CABasicAnimation *fullRotation;
fullRotation = [CABasicAnimation animationWithKeyPath:@"transform.rotation"];
fullRotation.fromValue = [NSNumber numberWithFloat:0];
fullRotation.toValue = [NSNumber numberWithFloat:(2*M_PI)];
// fullRotation.toValue = [NSNumber numberWithFloat:-(2*M_PI)]; // added this minus sign as i want to rotate it to anticlockwise
fullRotation.duration = duration;
fullRotation.speed = 2.0f; // Changed rotation speed
if (repeatCount == 0)
fullRotation.repeatCount = MAXFLOAT;
else
fullRotation.repeatCount = repeatCount;
[self.layer addAnimation:fullRotation forKey:@"360"];
}
(void)remstopAllAnimations
{
[self.layer removeAllAnimations];
};
(void)rempauseAnimations
{
[self rempauseLayer:self.layer];
}
(void)remresumeAnimations
{
[self remresumeLayer:self.layer];
}
(void)rempauseLayer:(CALayer *)layer
{
CFTimeInterval pausedTime = [layer convertTime:CACurrentMediaTime() fromLayer:nil];
layer.speed = 0.0;
layer.timeOffset = pausedTime;
}
(void)remresumeLayer:(CALayer *)layer
{
CFTimeInterval pausedTime = [layer timeOffset];
layer.speed = 1.0;
layer.timeOffset = 0.0;
layer.beginTime = 0.0;
CFTimeInterval timeSincePause = [layer convertTime:CACurrentMediaTime() fromLayer:nil] - pausedTime;
layer.beginTime = timeSincePause;
}