大家好，又见面了，我是全栈君。
@interface FirstViewController ()
@property (nonatomic,assign)BOOL isplay;
@end
@implementation FirstViewController
@synthesize isplay;
– (void)viewDidLoad
{
[super viewDidLoad];
isplay = NO;
//圆角
self.imgview.layer.cornerRadius = 150.0 / 2.0;
self.imgview.layer.masksToBounds = YES;
//加入动画
CABasicAnimation *monkeyAnimation = [CABasicAnimation animationWithKeyPath:@”transform.rotation.z”];
monkeyAnimation.toValue = [NSNumber numberWithFloat:2.0 *M_PI];
monkeyAnimation.duration = 1.5f;
monkeyAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
monkeyAnimation.cumulative = NO;
monkeyAnimation.removedOnCompletion = NO; //No Remove
monkeyAnimation.repeatCount = FLT_MAX;
[self.imgview.layer addAnimation:monkeyAnimation forKey:@”AnimatedKey”];
[self.imgview stopAnimating];
// 载入动画 但不播放动画
self.imgview.layer.speed = 0.2;
}
– (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
//開始动画
– (IBAction)startAnimate:(id)sender {
if (!isplay) {
isplay = YES;
self.imgview.layer.speed = 1.0;
self.imgview.layer.beginTime = 0.0;
CFTimeInterval pausedTime = [self.imgview.layer timeOffset];
CFTimeInterval timeSincePause = [self.imgview.layer convertTime:CACurrentMediaTime() fromLayer:nil] – pausedTime;
self.imgview.layer.beginTime = timeSincePause;
}
}
//停止动画并保存当前的角度
– (IBAction)stioAnimate:(id)sender {
if (isplay) {
isplay = NO;
CFTimeInterval pausedTime = [self.imgview.layer convertTime:CACurrentMediaTime() fromLayer:nil];
self.imgview.layer.speed = 0.0;
self.imgview.layer.timeOffset = pausedTime;
}
}
@end
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