标签：核心 sla res sub 过程 style 长度 pac fill
一.简单介绍 CAPropertyAnimation的子类
属性解析:
fromValue：keyPath相应属性的初始值
toValue：keyPath相应属性的结束值
随着动画的进行，在长度为duration的持续时间内，keyPath相应属性的值从fromValue渐渐的变为toValue。
如果 fillMode=kCAFillModeForwards和removedOnComletion=NO，那么在动画执行完毕后，图层会保持显示动画执行后的状态。但在实质上，图层的属性值还是动画执行前的初始值，并没有真正被改变。
比如，CALayer的position初始值为(0,0)，CABasicAnimation的fromValue为(10,10)，toValue为(100,100)，虽然动画执行完毕后图层保持在(100,100)这个位置，实质上图层的position还是为(0,0)。
二.平移动画
#import "ViewController.h"
@interface ViewController () @property(nonatomic,strong) CALayer *myLayer; @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; //创建layer CALayer *layer = [CALayer layer]; //设置layer属性 layer.bounds = CGRectMake(0, 0, 50, 80); layer.backgroundColor = [UIColor yellowColor].CGColor; layer.position = CGPointMake(50, 50); layer.anchorPoint = CGPointMake(0, 0); layer.cornerRadius = 20; //添加layer [self.view.layer addSublayer:layer]; _myLayer = layer; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } //设置动画(基础动画) - (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{ //创建核心动画 CABasicAnimation *animation = [CABasicAnimation animation]; //告诉系统要执行什么的动画 animation.keyPath = @"position"; //设置通过动画，将layer从哪儿移动到哪儿 animation.fromValue = [NSValue valueWithCGPoint:CGPointMake(0, 0)]; animation.toValue = [NSValue valueWithCGPoint:CGPointMake(200, 300)]; //设置动画执行完毕之后不删除动画 animation.removedOnCompletion = NO; //设置保持动画的最新状态 animation.fillMode = kCAFillModeForwards; //添加核心动画到layer [self.myLayer addAnimation:animation forKey:nil]; } @end
说明: byValue和toValue的区别，前者是在当前的位置上增加多少，后者是到指定的位置。 设置代理：设置动画的代理，可以监听动画的执行过程，这里设置控制器为代理。
#import <QuartzCore/QuartzCore.h> @interface ViewController ()<CAAnimationDelegate> @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; //创建layer CALayer *layer = [CALayer layer]; //设置layer的属性 layer.bounds = CGRectMake(0, 0, 50, 80); layer.backgroundColor = [UIColor yellowColor].CGColor; layer.position = CGPointMake(50, 50); layer.anchorPoint = CGPointMake(0, 0); layer.cornerRadius = 20; //添加layer [self.view.layer addSublayer:layer]; self.myLayer = layer; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } //设置动画(基础动画) - (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{ //创建核心动画 CABasicAnimation *animation = [CABasicAnimation animation]; //告诉系统要执行什么样的动画 animation.keyPath = @"position"; //设置通过动画,将layer从哪儿移动到哪儿 animation.fromValue = [NSValue valueWithCGPoint:CGPointMake(0, 0)]; animation.toValue = [NSValue valueWithCGPoint:CGPointMake(200, 300)]; //设置动画执行完毕之后不删除动画 animation.removedOnCompletion = NO; //设置保持动画的最新状态 animation.fillMode = kCAFillModeForwards; animation.delegate = self; //打印 NSString *str = NSStringFromCGPoint(self.myLayer.position); NSLog(@"执行前:%@",str); //添加核心动画到layer [_myLayer addAnimation:animation forKey:nil]; } #pragma mark -Core Animation Delegate - (void)animationDidStart:(CAAnimation *)anim{ NSLog(@"开始执行动画"); } - (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag{ //动画执行完毕，打印执行完毕后的position值 NSString *str = NSStringFromCGPoint(_myLayer.position); NSLog(@"执行后:%@",str); } @end
通过打印结构可以看出，属性值还是动画执行前的初始值{50,50}，并没有真正被改变为{200,300}。
三.缩放动画
#import "ViewController.h" @interface ViewController () @property(nonatomic,strong) CALayer *myLayer; @end
@implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; //创建layer CALayer *layer = [CALayer layer]; //设置layer的属性 layer.bounds = CGRectMake(0, 0, 50, 80); layer.backgroundColor = [UIColor yellowColor].CGColor; layer.position = CGPointMake(50, 50); layer.anchorPoint = CGPointMake(0, 0); layer.cornerRadius = 20; //添加layer [self.view.layer addSublayer:layer]; self.myLayer = layer; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } //设置动画(基础动画) - (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{ //创建动画 CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"bounds"]; //设置动画执行时间 animation.duration = 2.0; //设置动画执行完毕后不删除动画 animation.removedOnCompletion = NO; //设置保持动画的最新状态 animation.fillMode = kCAFillModeForwards; //修改属性，执行动画 animation.toValue = [NSValue valueWithCGRect:CGRectMake(0, 0, 200, 200)]; //添加动画到layer [_myLayer addAnimation:animation forKey:nil]; } #pragma mark -Core Animation Delegate - (void)animationDidStart:(CAAnimation *)anim{ } - (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag{ } @end
四.旋转动画
#import "ViewController.h" @interface ViewController () @property(nonatomic,strong) CALayer *myLayer; @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; //创建layer CALayer *layer = [CALayer layer]; //设置layer的属性 layer.bounds = CGRectMake(0, 0, 50, 80); layer.backgroundColor = [UIColor yellowColor].CGColor; layer.position = CGPointMake(50, 50); layer.anchorPoint = CGPointMake(0, 0); layer.cornerRadius = 20; //添加layer [self.view.layer addSublayer:layer]; self.myLayer = layer; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } //设置动画(基础动画) - (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{ //创建动画 CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"transform"]; //设置动画执行时间 animation.duration = 2.0; //设置动画执行完毕后不删除动画 animation.removedOnCompletion = NO; //设置保持动画的最新状态 animation.fillMode = kCAFillModeForwards; //修改属性，执行动画 animation.toValue = [NSValue valueWithCATransform3D:CATransform3DMakeRotation(M_PI_2+M_PI_4, 1, 1, 0)]; //添加动画到layer [_myLayer addAnimation:animation forKey:nil]; } #pragma mark -Core Animation Delegate - (void)animationDidStart:(CAAnimation *)anim{} - (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag{} @end
提示：如果要让图形以2D的方式旋转，只需要把CATransform3DMakeRotation在z方向上的值改为1即可。
五.补充
可以通过transform (KVC)的方式来进行设置
@interface ViewController () @property(nonatomic,strong) CALayer *myLayer; @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; //创建layer CALayer *layer = [CALayer layer]; //设置layer的属性 layer.bounds = CGRectMake(0, 0, 50, 80); layer.backgroundColor = [UIColor yellowColor].CGColor; layer.position = CGPointMake(50, 50); layer.anchorPoint = CGPointMake(0, 0); layer.cornerRadius = 20; //添加layer [self.view.layer addSublayer:layer]; self.myLayer = layer; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } //设置动画(基础动画) - (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{ //创建动画 CABasicAnimation *animation = [CABasicAnimation animation]; animation.keyPath = @"transform"; //设置动画执行时间 animation.duration = 2.0; //设置动画执行完毕后不删除动画 animation.removedOnCompletion = NO; //设置保持动画的最新状态 animation.fillMode = kCAFillModeForwards; //修改属性，执行动画 animation.toValue = [NSValue valueWithCATransform3D:CATransform3DMakeTranslation(0, 100, 1)]; //添加动画到layer [_myLayer addAnimation:animation forKey:nil]; } #pragma mark -Core Animation Delegate - (void)animationDidStart:(CAAnimation *)anim{} - (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag{} @end
标签：核心 sla res sub 过程 style 长度 pac fill
原文地址：https://www.cnblogs.com/jiuyi/p/10104868.html
