IOS动画 旋转两圈

//

//  ViewController.m

//  KeyFrameAnimation

//

//  Created by vincent_guo on 13-9-6.

//  Copyright (c) 2013年 vincent_guo. All rights reserved.

//

 

#import "ViewController.h"

#import <QuartzCore/QuartzCore.h>

 

@interface ViewController (){

     UIImageView *_imageView;

}

 

@end

 

@implementation ViewController

 

- ( void )viewDidLoad

{

     [super viewDidLoad];

     // Do any additional setup after loading the view, typically from a nib.

     _imageView = [[UIImageView alloc] init];

     _imageView.bounds = CGRectMake(0, 0, 80, 80);

     _imageView.center = CGPointMake(160, 50);

     _imageView.image = [UIImage imageNamed:@ "clock" ];

     [self.view addSubview:_imageView];

     [_imageView release];

}

 

-( void )click:(id)sender{

     [self turnTwoRound2];

}

 

#pragma mark 使用CABasicAnimation让View向左转两圈，要向右转两圈，把-M_PI负号去掉就可以了

-( void )turnTwoRound1 {

     CABasicAnimation* rotationAnimation;

     rotationAnimation = [CABasicAnimation animationWithKeyPath:@ "transform.rotation.z" ];

     rotationAnimation.toValue = [NSNumber numberWithFloat: -M_PI * 2.0 ];

     rotationAnimation.duration = 0.5;

     rotationAnimation.repeatCount = 2; //动画执行两次

     [_imageView.layer addAnimation:rotationAnimation forKey:@ "rotationAnimation" ];

}

 

 

#pragma mark 使用CAKeyframeAnimation让View向左转两圈，要向右转两圈，把-M_PI负号去掉就可以了

-( void )turnTwoRound2{

     CAKeyframeAnimation *rotateAnimation = [CAKeyframeAnimation animationWithKeyPath:@ "transform.rotation.z" ];

     rotateAnimation.duration = 0.5;

     //先从原始位置向左转180度，再向左转180度是-M_PI*4,不是-M_PI*2哦，自己好好理解下)

     rotateAnimation.values = [NSArray arrayWithObjects:

                               [NSNumber numberWithFloat:0.0f],

                               [NSNumber numberWithFloat:-M_PI * 2],

                               [NSNumber numberWithFloat:-M_PI * 4], nil];

     [_imageView.layer addAnimation:rotateAnimation forKey:@ "rotationAnimation" ];

}

 

@end

转自：http://www.cnblogs.com/vincent-guo/p/3305428.html