.h文件中定义一个枚举，有三个值，代表不同的动画效果
#import <UIKit/UIKit.h>
typedef NS_ENUM(NSUInteger, YSCAnimatinType) {
YSCAnimatinTypeBasic,
YSCAnimatinTypeKeyFrame,
YSCAnimatinTypeKeyFramePath
};
@interface YSCLayerAnimationViewController : UIViewController
@end
.m文件中实现代码如下
//
// YSCLayerAnimationViewController.m
// 动画
//
// Created by 韩燕辉 on 16/9/20.
// Copyright © 2016年 hyh. All rights reserved.
//
#import "YSCLayerAnimationViewController.h"
@implementation YSCLayerAnimationViewController
- (void)viewDidLoad
{
[super viewDidLoad];
self.view.backgroundColor = [UIColor whiteColor];
//画圆
[self addShadowLayer];
//添加蓝色圆
CALayer *subLayer = [[CALayer alloc] init];
subLayer.position = CGPointMake(50, 100);
subLayer.bounds = CGRectMake(0, 0, 30, 30);
subLayer.backgroundColor = [UIColor blueColor].CGColor;
subLayer.masksToBounds = YES;
subLayer.cornerRadius = 15;
[self.view.layer addSublayer:subLayer];
[subLayer setNeedsDisplay];
}
//画圆
- (void)addShadowLayer
{
CALayer *shadowLayer = [[CALayer alloc] init];
shadowLayer.position = CGPointMake(50, 100);
shadowLayer.bounds = CGRectMake(0, 0, 30, 30);
shadowLayer.cornerRadius = 15;
shadowLayer.shadowColor = [UIColor yellowColor].CGColor;
shadowLayer.shadowOffset = CGSizeMake(3, 3);
shadowLayer.shadowOpacity = 0.5;
shadowLayer.borderColor = [UIColor redColor].CGColor;
shadowLayer.borderWidth = 2;
[self.view.layer addSublayer:shadowLayer];
}
- (void)drawLayer:(CALayer *)layer inContext:(CGContextRef)ctx
{
// CGContextScaleCTM(ctx, 1, -1);
// CGContextTranslateCTM(ctx, 0, -30);
// CGImageRef imageRef = [UIImage imageNamed:@"tree.jpg"].CGImage;
// CGContextDrawImage(ctx, CGRectMake(0, 0, 100, 100), imageRef);
// CGImageRelease(imageRef);
}
- (void)addAnimationToLayerWithMode:(YSCAnimatinType)mode endPoint:(CGPoint)endPoint
{
NSArray *subLayers = [self.view.layer sublayers];
CALayer *animationLayer = [subLayers lastObject];
if (YSCAnimatinTypeBasic == mode) {
CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"position"];
animation.fromValue = [NSValue valueWithCGPoint:CGPointMake(50, 100)];
animation.toValue = [NSValue valueWithCGPoint:endPoint];
animation.duration = 3;
[animationLayer addAnimation:animation forKey:@"animaton-position"];
} else if (YSCAnimatinTypeKeyFrame == mode) {
CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"position"];
animation.values = [NSArray arrayWithObjects:[NSValue valueWithCGPoint:CGPointMake(50, 100)], [NSValue valueWithCGPoint:CGPointMake(150, 200)], [NSValue valueWithCGPoint:CGPointMake(50, 300)], [NSValue valueWithCGPoint:endPoint], nil];
animation.duration = 4;
animation.calculationMode = kCAAnimationPaced;//kCAAnimationLinear:每个keyValue间匀速 kCAAnimationCubic:平滑移动 kCAAnimationDiscrete:跳动，没有中间的滑动 kCAAnimationPaced:整个动画匀速，动画时间相关参数默认设置好 kCAAnimationCubicPaced:整个动画平滑匀速，动画时间相关参数默认设置好
animation.keyTimes = [NSArray arrayWithObjects:[NSNumber numberWithFloat:0.0], [NSNumber numberWithFloat:0.3], [NSNumber numberWithFloat:0.6], [NSNumber numberWithFloat:0.7], [NSNumber numberWithFloat:1.0], nil];//kCAAnimationDiscrete 需要多添一个time值，最后一个时间间隔用于动画结束后返回layer的初始状态或新设置的，kCAAnimationPaced和kCAAnimationCubicPaced对time属性不起作用，其他的keyValue数与time数相同，代表value的起始时间
animation.delegate = self;//得放在addAnimation:之前，否则代理不会调用
//存储当前位置在动画结束后使用
[animation setValue:[NSValue valueWithCGPoint:endPoint] forKey:@"AnimationLocation"];
[animationLayer addAnimation:animation forKey:@"animation-point"];
} else if (YSCAnimatinTypeKeyFramePath == mode) {
animationLayer.position = CGPointMake(350, 100);//加在添加动画前，先把layer的状态设为动画的最后状态，可避免动画完成后产生一个从初始位置到最终设置位置的快速隐式动画；若加在添加动画后，会产生一个从初始位置到最终设置位置的快速隐式动画，然后再开始添加的动画；采用代理的方式，在动画结束后，设置layer的最终状态（删除隐式动画），则可能出现一个从初始位置到最终设置位置的快速闪动。
CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"position"];
CGMutablePathRef pathRef = CGPathCreateMutable();
CGPathMoveToPoint(pathRef, NULL, 50, 100);
CGPathAddCurveToPoint(pathRef, NULL, 70, 200, 230, 200, 250, 100);
CGPathAddCurveToPoint(pathRef, NULL, 270, 200, 330, 200, 350, 100);
animation.path = pathRef;
CGPathRelease(pathRef);
animation.duration = 3;
// animation.beginTime = CACurrentMediaTime() + 2;//此beginTime为图层的本地时间
animation.calculationMode = kCAAnimationLinear;
animation.keyTimes = [NSArray arrayWithObjects:[NSNumber numberWithFloat:0.0], [NSNumber numberWithFloat:0.3], [NSNumber numberWithFloat:1.0], nil];//对于keyValues类型，标识各个value间的起始时间，个数为value数相同（kCAAnimationDiscrete会多一个）；对于path则表示各个线段的起始时间，包括直线或曲线
animation.delegate = self;//得放在addAnimation:之前，否则代理不会调用
//存储当前位置在动画结束后使用
[animation setValue:[NSValue valueWithCGPoint:CGPointMake(350, 100)] forKey:@"AnimationLocation"];
[animationLayer addAnimation:animation forKey:@"animation-point"];
}
}
-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint point = [touch locationInView:self.view];
NSArray *subLayers = [self.view.layer sublayers];
CALayer *animationLayer = [subLayers lastObject];
CAAnimation *animation = [animationLayer animationForKey:@"animation-point"];
CFTimeInterval timeInterval = [animationLayer convertTime:CACurrentMediaTime() fromLayer:nil];
NSLog(@"CurrentMediaTime:%f",timeInterval);
if (animation) {
if (0 == animationLayer.speed) {
[self resumeAnimation];
} else {
[self pauseAnimation];
}
} else {
NSInteger mode = YSCAnimatinTypeKeyFrame;
[self addAnimationToLayerWithMode:mode endPoint:point];
animationLayer.beginTime = 1;
}
}
- (void)resumeAnimation
{
NSArray *subLayers = [self.view.layer sublayers];
CALayer *animationLayer = [subLayers lastObject];
animationLayer.beginTime = CACurrentMediaTime() - animationLayer.timeOffset;
animationLayer.timeOffset = 0;
animationLayer.speed = 1;
}
- (void)pauseAnimation
{
NSArray *subLayers = [self.view.layer sublayers];
CALayer *animationLayer = [subLayers lastObject];
CFTimeInterval timeInterval = [animationLayer convertTime:CACurrentMediaTime() fromLayer:nil];
animationLayer.timeOffset = timeInterval;
animationLayer.speed = 0;
}
#pragma mark - CAAnimationDelegate
- (void)animationDidStart:(CAAnimation *)anim
{
}
//停止动画
- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag
{
NSArray *subLayers = [self.view.layer sublayers];
CALayer *animationLayer = [subLayers lastObject];
//animationLayer.position = [[anim valueForKey:@"AnimationLocation"] CGPointValue];//直接设置最终位置，会产生一个从初始位置到最终设置位置的快速隐式动画，解决这个问题有两种办法：关闭图层隐式动画、设置动画图层为根图层
//关闭图层隐式动画
//开启事务
[CATransaction begin];
//禁用隐式动画
[CATransaction setDisableActions:YES];
animationLayer.position=[[anim valueForKey:@"AnimationLocation"] CGPointValue];//设置最终位置，否则，layer会回到初始位置，动画并没有改变layer。
//提交事务
[CATransaction commit];
}
@end
注意点，在YSCAnimatinTypeBasic中，动画结束的时候要设置这两个属性，才能保证结束的时候停留在动画结束的最后时刻
animation.removedOnCompletion = NO;
animation.fillMode = kCAFillModeForwards;
YSCAnimatinTypeBasic
Snip20160920_1.png
YSCAnimatinTypeKeyFrame
Snip20160920_2.png
YSCAnimatinTypeKeyFramePath
Snip20160920_3.png
