Core animation 或者叫Quartz Core是一个Objective C类库，位于iOS框架的Media层。

在project中使用Core Animation时，首先要将QuartzCore.framework链接到project中，然后在使用animation的类中引入对应的h文件

#import <QuartzCore/QuartzCore.h>

添加动画：

1.使用UIKit中提供的animation API

UIKit中有一些接口可以创建简单的动画，例如：

    CGRect smallRect = CGRectMake(0, 0, 20, 30);
    CGRect bigRect = CGRectMake(0, 0, 200, 300);
    
    UIImageView *imgview = [[UIImageView alloc] initWithFrame:smallRect];
    imgview.backgroundColor = [UIColor redColor];
    [self.view addSubview:imgview];
    
    [UIView animateWithDuration:2 animations:^{
        imgview.frame = bigRect;
    }];
    
    [UIView animateWithDuration:2 animations:^{
        imgview.frame = bigRect;
    } completion:^(BOOL finished){
        if(finished){
            imgview.backgroundColor = [UIColor blueColor];
        }
    }];
    
    // set delay time,duration time,animation clock,completion block
    [UIView animateWithDuration:2 delay:5 options:0 animations:^{
        imgview.frame = bigRect;
    }completion:^(BOOL finished){
        if(finished){
            imgview.backgroundColor = [UIColor blueColor];
        }
    }];

2.使用Core Animation

使用Core Animation可以创建嵌套的对象，并且可以沿着x、y、z轴对它们旋转rotation、缩放scale和转换transform。使用Core animation，你可以创建动态的用户界面而不用使用更底层的图形API，如OpenGL ES。

一张图片在一定范围内，水平左右移动：

	[self.imageView setImage:[UIImage imageNamed:@"推荐页登录按钮.png"]];
        CABasicAnimation *theAnimation;    
        theAnimation=[CABasicAnimation animationWithKeyPath:@"transform.translation.x"];
        theAnimation.duration=1;
        theAnimation.repeatCount=INT_MAX;
        theAnimation.autoreverses=YES;
        theAnimation.fromValue=[NSNumber numberWithFloat:0];
        theAnimation.toValue=[NSNumber numberWithFloat:-60];
        [self.imageView.layer addAnimation:theAnimation forKey:@"animateLayer"];

一张图片逆时针旋转

       [self.imageView setImage:[UIImage imageNamed:@"推荐页登录按钮.png"]];
        CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"transform"];
        animation.delegate = self;
        animation.toValue = [NSValue valueWithCATransform3D:CATransform3DMakeRotation(M_PI , 0, 0, 1.0)];
        animation.duration = 1;
        animation.cumulative = YES;
        animation.repeatCount = INT_MAX;
        [self.imageView.layer addAnimation:animation forKey:@"animation"];

Core Animation相关动画

Core Animation教学：关键桢动画

Core Animation教学：窗口淡入淡出特效

Core Animation教学：使用Transitions制作带动画效果的向导对话框

    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:0.5];
    [_headerView.activityIndicator stopAnimating];
    _headerView.hidden = YES;
    
    CGRect tFrame = self.tableView.frame;
    CGRect hFrame = _headerView.frame;
    self.tableView.frame = CGRectMake(hFrame.origin.x, hFrame.origin.y, tFrame.size.width, tFrame.size.height);
    
    [UIView commitAnimations];

Core Animation学习