长路漫漫，唯剑作伴--Core Animation

Posted 2020-09-07 来事啊

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一、UIView和CALayer

关系
- 在创建UIView对象时，UIView内部会自动创建一个层(即CALayer对象)，通过UIView的layer属性可以访问这个层。当UIView需要显示到屏幕上时，会调用drawRect:方法进行绘图，并且会将所有内容绘制在自己的层上，绘图完毕后，系统会将层拷贝到屏幕上，于是就完成了UIView的显示。
- 换句话说，UIView本身不具备显示的功能，是它内部的层才有显示功能。
- 两者都有树状层级结构，layer 内部有 SubLayers，View 内部有 SubViews.但是 Layer 比 View 多了个AnchorPoint
不同
- 两者最明显的区别是 View可以接受并处理事件，而 Layer 不可以.
- UIView主要是对显示内容的管理而 CALayer 主要侧重显示内容的绘制。
- 在做 ios 动画的时候，修改非 RootLayer的属性（譬如位置、背景色等）会默认产生隐式动画，而修改UIView则不会。

修改CALayer的属性

- (IBAction)changeCorners:(UIButton *)sender {
    self.layer.cornerRadius = (self.layer.cornerRadius == 0.0f) ? 30.0f : 0.0f;
    NSLog(@"%@",sender.nextResponder);
}
- (IBAction)changeOpacity:(UIButton *)sender {
    self.layer.opacity = (self.layer.opacity == 1.0f) ? 0.8f : 1.0f;
}
- (IBAction)changeBorders:(UIButton *)sender {
    self.layer.borderWidth = (self.layer.borderWidth == 10) ? 0 : 10;
}
- (IBAction)changeColors:(UIButton *)sender {
    self.layer.backgroundColor = (self.layer.backgroundColor == [UIColor blueColor].CGColor) ? [UIColor redColor].CGColor : [UIColor blueColor].CGColor;
}
- (IBAction)changePositon:(UIButton *)sender {
    self.layer.position = (self.layer.position.x == 207) ? CGPointMake(300, 368) : CGPointMake(207, 368);
}
- (IBAction)changeBounds:(UIButton *)sender {
    self.layer.bounds = (self.layer.bounds.size.width == 100) ? CGRectMake(0, 0, 150, 100) : CGRectMake(0, 0, 100, 100);
}
- (IBAction)changeTransform:(UIButton *)sender {
    self.layer.transform = CATransform3DMakeRotation(M_PI_4, 0, 0, 1);
}

二、Core Animation

CABasicAnimation

- (IBAction)translation:(UIButton *)sender {
    CABasicAnimation *anim = [CABasicAnimation animationWithKeyPath:@"position"];
    anim.delegate = self;
    anim.duration = 1.5;
    anim.toValue = [NSValue valueWithCGPoint:CGPointMake(200, 300)];
//    anim.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];
//    anim.removedOnCompletion = NO;
//    anim.fillMode = kCAFillModeForwards;
    [self.redView.layer addAnimation:anim forKey:@"ppposition"];
}
- (void)translation {
    CABasicAnimation *anim = [CABasicAnimation animationWithKeyPath:@"transform"];
    anim.delegate = self;
    anim.duration = 1.5;
    CATransform3D form = CATransform3DMakeTranslation(200, 300, 0);
    anim.toValue = [NSValue valueWithCATransform3D:form];
//    anim.removedOnCompletion = NO;
//    anim.fillMode = kCAFillModeForwards;
    [self.redView.layer addAnimation:anim forKey:@"position"];
}
- (IBAction)scale:(UIButton *)sender {
    CABasicAnimation *anim = [CABasicAnimation animationWithKeyPath:@"bounds"];
    anim.duration = 1.5;
    anim.delegate = self;
    anim.toValue = [NSValue valueWithCGRect:CGRectMake(0, 0, 200, 200)];
    [self.redView.layer addAnimation:anim forKey:@"ssscale"];
}
- (void)scale {
    CABasicAnimation *anim = [CABasicAnimation animationWithKeyPath:@"transform"];
    anim.delegate = self;
    anim.duration = 1.5;
    anim.fromValue = [NSValue valueWithCATransform3D:CATransform3DMakeScale(1, 1, 1)];
    anim.toValue = [NSValue valueWithCATransform3D:CATransform3DMakeScale(2, 2, 1)];
    [self.redView.layer addAnimation:anim forKey:nil];
}
- (IBAction)rotation:(UIButton *)sender {
    CABasicAnimation *anim = [CABasicAnimation animationWithKeyPath:@"transform"];
    anim.duration = 1.5;
    anim.delegate = self;
    anim.toValue = [NSValue valueWithCATransform3D:CATransform3DMakeRotation(M_PI_4, 0, 0, 1)];
    [self.redView.layer addAnimation:anim forKey:nil];
}


- (void)animationDidStart:(CAAnimation *)anim {
    NSLog(@"____animation start");
}
- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag {
    NSLog(@"____animation done");
}

CAKeyframeAnimation

- (IBAction)points:(UIButton *)sender {
    CAKeyframeAnimation *anim = [CAKeyframeAnimation animationWithKeyPath:@"position"];
    anim.duration = 1.5;
    anim.delegate = self;
    NSValue *v1 = [NSValue valueWithCGPoint:CGPointMake(100, 100)];
    NSValue *v2 = [NSValue valueWithCGPoint:CGPointMake(200, 100)];
    NSValue *v3 = [NSValue valueWithCGPoint:CGPointMake(200, 200)];
    NSValue *v4 = [NSValue valueWithCGPoint:CGPointMake(100, 200)];
    anim.values = @[v1, v2, v3, v4];
    [self.redView.layer addAnimation:anim forKey:@""];
}
- (IBAction)path:(UIButton *)sender {
    CAKeyframeAnimation *anim = [CAKeyframeAnimation animationWithKeyPath:@"position"];
    anim.duration = 1.5;
    anim.delegate = self;
    CGMutablePathRef path = CGPathCreateMutable();
    CGPathAddEllipseInRect(path, NULL, CGRectMake(100, 100, 300, 300));
    anim.path = path;
    [self.redView.layer addAnimation:anim forKey:@""];
}
- (void)animationDidStart:(CAAnimation *)anim {
    NSLog(@"____start");
}
- (void)animationDidStop:(CAAnimation *)anim {
    NSLog(@"____done");
}

CAAnimationGroup

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    CABasicAnimation *scale = [CABasicAnimation animationWithKeyPath:@"transform.scale"];
    scale.toValue = @(0.0);
    
    CABasicAnimation *move = [CABasicAnimation animationWithKeyPath:@"transform.translation"];
    move.toValue = [NSValue valueWithCGPoint:CGPointMake(200, 200)];
    
    CABasicAnimation *rotation = [CABasicAnimation animationWithKeyPath:@"transform.rotation"];
    rotation.toValue = @(M_PI);
    
    CAAnimationGroup *group = [CAAnimationGroup animation];
    group.duration = 2;
    group.delegate = self;
    group.animations = @[scale, move, rotation];
    [self.redView.layer addAnimation:group forKey:nil];
}
- (void)animationDidStart:(CAAnimation *)anim {
    NSLog(@"____start");
}
- (void)animationDidStop:(CAAnimation *)anim {
    NSLog(@"____done");
}

CATransition

- (IBAction)pre:(UIButton *)sender {
    self.index--;
    if (self.index == 0) {
        self.index = 4;
    }
    NSString *name = [NSString stringWithFormat:@"%d.png",_index];
    self.imgView.image = [UIImage imageNamed:name];
    CATransition *anim = [CATransition animation];
    //    anim.type = @"cube";
    //    anim.subtype = kCATransitionFromLeft;
    anim.type = @"pageCurl";
    anim.duration = 0.5;
    [self.imgView.layer addAnimation:anim forKey:nil];

}
- (IBAction)nex:(UIButton *)sender {
    self.index++;
    NSLog(@"__%d",self.index);
    if (self.index == 5) {
        self.index = 1;
    }
    NSString *name = [NSString stringWithFormat:@"%d.png",_index];
    self.imgView.image = [UIImage imageNamed:name];
    CATransition *anim = [CATransition animation];
    //    anim.type = @"cube";
    //    anim.subtype = kCATransitionFromLeft;
    anim.type = @"pageUnCurl";
    anim.duration = 0.5;
    [self.imgView.layer addAnimation:anim forKey:nil];
}

三、UIBezierPath

ZYView.h

#import <UIKit/UIKit.h>

typedef NS_ENUM(NSUInteger, ZYBezierPathType) {
    kDefaultPath = 1, // 三角形
    kRectPath = 2, // 矩形
    kCirclePath = 3,//圆
    kOvalPath = 4, // 椭圆
    kRoundedRectPath = 5, // 带圆角的矩形
    kArcPath = 6, // 弧
    kSecondBezierPath = 7, // 二次贝塞尔曲线
    kThirdBezierPath = 8 // 三次贝塞尔曲线
};

@interface ZYView : UIView

@property (nonatomic, assign)ZYBezierPathType type;

@end

ZYView.m

#import "ZYView.h"

@implementation ZYView

- (void)drawRect:(CGRect)rect {
    switch (self.type) {
        case kDefaultPath: {// 三角形
            [self drawTrianglePath];
            break;
        }
        case kRectPath: {// 矩形
            [self drawRectPath];
            break;
        }
        case kCirclePath: {//圆
            [self drawCiclePath];
            break;
        }
        case kOvalPath: {// 椭圆
            [self drawOvalPath];
            break;
        }
        case kRoundedRectPath: {// 带圆角的矩形
            [self drawRoundedRectPath];
            break;
        }
        case kArcPath: {// 弧
            [self drawARCPath];
            break;
        }
        case kSecondBezierPath: {// 二次贝塞尔曲线
            [self drawSecondBezierPath];
            break;
        }
        case kThirdBezierPath: {// 三次贝塞尔曲线
            [self drawThirdBezierPath];
            break;
        }
        default: {
            break;
        }
    }
}

// 画三角形
- (void)drawTrianglePath {
    UIBezierPath *path = [UIBezierPath bezierPath];
    [path moveToPoint:CGPointMake(20, 20)];
    [path addLineToPoint:CGPointMake(self.frame.size.width - 40, 20)];
    [path addLineToPoint:CGPointMake(self.frame.size.width / 2, self.frame.size.height - 20)];
    
    // 最后的闭合线是可以通过调用closePath方法来自动生成的，也可以调用-addLineToPoint:方法来添加
    //  [path addLineToPoint:CGPointMake(20, 20)];
    
    [path closePath];
    
    // 设置线宽
    path.lineWidth = 1.5;
    
    // 设置填充颜色
    UIColor *fillColor = [UIColor greenColor];
    [fillColor set];
    [path fill];
    
    // 设置画笔颜色
    UIColor *strokeColor = [UIColor blueColor];
    [strokeColor set];
    
    // 根据我们设置的各个点连线
    [path stroke];
}

// 画矩形
- (void)drawRectPath {
    UIBezierPath *path = [UIBezierPath bezierPathWithRect:CGRectMake(20, 20, self.frame.size.width - 40, self.frame.size.height - 40)];
    
    path.lineWidth = 1.5;
    path.lineCapStyle = kCGLineCapRound;
    path.lineJoinStyle = kCGLineJoinBevel;
    
    // 设置填充颜色
    UIColor *fillColor = [UIColor greenColor];
    [fillColor set];
    [path fill];
    
    // 设置画笔颜色
    UIColor *strokeColor = [UIColor blueColor];
    [strokeColor set];
    
    // 根据我们设置的各个点连线
    [path stroke];
}

// 画圆
- (void)drawCiclePath {
    // 传的是正方形，因此就可以绘制出圆了
    UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(20, 20, self.frame.size.width - 40, self.frame.size.width - 40)];
    
    // 设置填充颜色
    UIColor *fillColor = [UIColor greenColor];
    [fillColor set];
    [path fill];
    
    // 设置画笔颜色
    UIColor *strokeColor = [UIColor blueColor];
    [strokeColor set];
    
    // 根据我们设置的各个点连线
    [path stroke];
}

// 画椭圆
- (void)drawOvalPath {
    // 传的是不是正方形，因此就可以绘制出椭圆圆了
    UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(20, 20, self.frame.size.width - 80, self.frame.size.height - 40)];
    
    // 设置填充颜色
    UIColor *fillColor = [UIColor greenColor];
    [fillColor set];
    [path fill];
    
    // 设置画笔颜色
    UIColor *strokeColor = [UIColor blueColor];
    [strokeColor set];
    
    // 根据我们设置的各个点连线
    [path stroke];
}

- (void)drawRoundedRectPath {
    //  UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(20, 20, self.frame.size.width - 40, self.frame.size.height - 40) cornerRadius:10];
    
    UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(20, 20, self.frame.size.width - 40, self.frame.size.height - 40) byRoundingCorners:UIRectCornerTopRight cornerRadii:CGSizeMake(20, 20)];
    // 设置填充颜色
    UIColor *fillColor = [UIColor greenColor];
    [fillColor set];
    [path fill];
    
    // 设置画笔颜色
    UIColor *strokeColor = [UIColor blueColor];
    [strokeColor set];
    
    // 根据我们设置的各个点连线
    [path stroke];
}
// 画弧
#define   kDegreesToRadians(degrees)  ((pi * degrees)/ 180)
- (void)drawARCPath {
    const CGFloat pi = 3.14159265359;
    
    CGPoint center = CGPointMake(self.frame.size.width / 2, self.frame.size.height / 2);
    UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:center
                                                        radius:100
                                                    startAngle:0
                                                      endAngle:kDegreesToRadians(135)
                                                     clockwise:YES];
    
    path.lineCapStyle = kCGLineCapRound;
    path.lineJoinStyle = kCGLineJoinRound;
    path.lineWidth = 5.0;
    
    UIColor *strokeColor = [UIColor redColor];
    [strokeColor set];
    
    [path stroke];
}
// 二次贝塞尔曲线
- (void)drawSecondBezierPath {
    UIBezierPath *path = [UIBezierPath bezierPath];
    
    // 首先设置一个起始点
    [path moveToPoint:CGPointMake(20, self.frame.size.height - 100)];
    
    // 添加二次曲线
    [path addQuadCurveToPoint:CGPointMake(self.frame.size.width - 20, self.frame.size.height - 100)
                 controlPoint:CGPointMake(self.frame.size.width / 2, 0)];
    
    path.lineCapStyle = kCGLineCapRound;
    path.lineJoinStyle = kCGLineJoinRound;
    path.lineWidth = 5.0;
    
    UIColor *strokeColor = [UIColor redColor];
    [strokeColor set];
    
    [path stroke];
}
// 三次贝塞尔曲线
- (void)drawThirdBezierPath {
    UIBezierPath *path = [UIBezierPath bezierPath];
    
    // 设置起始端点
    [path moveToPoint:CGPointMake(20, 150)];
    
    [path addCurveToPoint:CGPointMake(300, 150)
            controlPoint1:CGPointMake(160, 0)
            controlPoint2:CGPointMake(160, 250)];
    
    path.lineCapStyle = kCGLineCapRound;
    path.lineJoinStyle = kCGLineJoinRound;
    path.lineWidth = 5.0;
    
    UIColor *strokeColor = [UIColor redColor];
    [strokeColor set];
    
    [path stroke];
}


@end

ViewController.m

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    ZYView *view = [[ZYView alloc] initWithFrame:CGRectMake(100, 100, 250, 250)];
    view.backgroundColor = [UIColor redColor];
    view.type = kDefaultPath;
    [view setNeedsDisplay];
    [self.view addSubview:view];
}

三、CAShaplayer

说到CAShapLayer就不得不说到UIBezierPath： UIBezierPath是在 UIKit 中的一个类，继承于NSObject,可以创建基于矢量的路径。使用此类可以定义常见的圆形、多边形等形状。我们使用直线、弧（arc）来创建复杂的曲线形状。每一个直线段或者曲线段的结束的地方是下一个的开始的地方。每一个连接的直线或者曲线段的集合成为subpath。一个UIBezierPath对象定义一个完整的路径包括一个或者多个subpaths
CAShapeLayer： CAShapeLayer顾名思义，继承于CALayer。每个CAShapeLayer对象都代表着将要被渲染到屏幕上的一个任意的形状(shape)。具体的形状由其path(类型为CGPathRef)属性指定。普通的CALayer是矩形，所以需要frame属性。CAShapeLayer初始化时也需要指定frame值，但 它本身没有形状，它的形状来源于其属性path 。CAShapeLayer有不同于CALayer的属性，它从CALayer继承而来的属性在绘制时是不起作用的
步骤：
1、新建UIBezierPath对象bezierPath
2、新建CAShapeLayer对象caShapeLayer
3、将bezierPath的CGPath赋值给caShapeLayer的path，即caShapeLayer.path = bezierPath.CGPath
4、把caShapeLayer添加到某个显示该图形的layer中