Core Animation中的基础动画

基础动画

在开发过程中很多情况下通过基础动画就可以满足开发需求，前面例子中使用的UIView代码块进行图像放大缩小的演示动画也是基础动画（在iOS7 中UIView也对关键帧动画进行了封装），只是UIView装饰方法隐藏了更多的细节。如果不使用UIView封装的方法，动画创建一般分为以下几步：

1.初始化动画并设置动画属性

2.设置动画属性初始值（可以省略）、结束值以及其他动画属性

3.给图层添加动画

//
//  ViewController.m
//  Demo0218
//
//  Created by wiseman on 16/2/18.
//  Copyright (c) 2016年 wiseman. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()

{
    CALayer *_layer;
}

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    [self test1];
}

-(void)test1{
    //CA核心动画：基础动画，关键帧动画，动画组
    _layer = [[CALayer alloc]init];
    _layer.bounds = CGRectMake(0, 0, 10, 20);
    _layer.position = CGPointMake(50, 150);
    _layer.backgroundColor = [UIColor redColor].CGColor;
    [self.view.layer addSublayer:_layer];
    
}

//移动动画
-(void)translatonAnimation:(CGPoint)location{
    //创建动画并制定动画属性
    CABasicAnimation *basicAnimation = [CABasicAnimation animationWithKeyPath:@"position"];
    //设置动画属性的初始值和结束值
//    basicAnimation.fromValue = [NSValue valueWithCGPoint:CGPointMake(0, 0)];
    basicAnimation.toValue = [NSValue valueWithCGPoint:location];
    basicAnimation.duration = 2.0;
    //运行一次是否删除动画
//    basicAnimation.removedOnCompletion = NO;
    //设置重复次数,HUGE_VALF可看做无穷大，起到循环动画的效果
//    basicAnimation.repeatCount = HUGE_VALF;
    
    //代理
    basicAnimation.delegate = self;
    [basicAnimation setValue:[NSValue valueWithCGPoint:location] forKey:@"KCBasicAnimationLocation"];
    [basicAnimation setValue:@"fuck1" forKey:@"AnimName"];
    
    //添加动画到图层，注意key相当于给动画进行命名，以后获得该动画时可以使用此名称获取
    [_layer addAnimation:basicAnimation forKey:@"fuck"];
}

//旋转动画
-(void)rotationAnimation{
    //创建动画并制定动画属性
    CABasicAnimation *basicAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
    //设置动画属性的初始值和结束值
    //    basicAnimation.fromValue = [NSValue valueWithCGPoint:CGPointMake(0, 0)];
    basicAnimation.toValue=[NSNumber numberWithFloat:M_PI_2*4];
    basicAnimation.duration = 3.0;
//    basicAnimation.autoreverses = true;//旋转后再旋转到原来的位置
    basicAnimation.repeatCount = HUGE_VALF;

    //添加动画到图层，注意key相当于给动画进行命名，以后获得该动画时可以使用此名称获取
    [_layer addAnimation:basicAnimation forKey:@"fuck2"];
}

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    UITouch *touch = touches.anyObject;
    CGPoint location = [touch locationInView:self.view];
    //创建并开始动画
    [self translatonAnimation:location];
    [self rotationAnimation];
}

- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag{
    
    NSString *str = [anim valueForKey:@"AnimName"];
    
    if ([str isEqualToString:@"fuck1"]) {
        CGPoint point = [[anim valueForKey:@"KCBasicAnimationLocation"] CGPointValue];
        //开启事务
        [CATransaction begin];
        //禁用隐式动画
        [CATransaction setDisableActions:YES];
        
        _layer.position = point;
        
        //提交事务
        [CATransaction commit];
    }
    
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end