第三十八篇：CAKeyframeAnimation--+CAShapeLayer+UIBezierPath用法，关键帧动画

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有个很关键的属性：rotationMode

// 把rotationMode设置=kCAAnimationRotateAuto根据曲线的切线自动旋转

    keyframeAnimation.rotationMode =kCAAnimationRotateAuto ;

//
//  ViewController.m
//  CAKeyframeAnimation--+CAShapeLayer+UIBezierPath用法
//
//  Created by 瞿杰 on 2017/3/24.
//  Copyright © 2017年 yiniu. All rights reserved.
//#import "ViewController.h"@interface ViewController ()@property (nonatomic , strong) UIView * contentView ;@end@implementation ViewController- (void)viewDidLoad {[super viewDidLoad];CGFloat screenWidth = [UIScreen mainScreen].bounds.size.width ;CGFloat screenHeight = [UIScreen mainScreen].bounds.size.height ;self.contentView = [[UIView alloc] initWithFrame:CGRectMake(0, 0,screenWidth , screenHeight)];self.contentView.backgroundColor = [UIColor blackColor];[self.view addSubview:self.contentView];UIBezierPath * bezierPath = [UIBezierPath bezierPath];[bezierPath moveToPoint:CGPointMake(0, 150)];[bezierPath addCurveToPoint:CGPointMake(300, 150) controlPoint1:CGPointMake(300.0*1/4, 0) controlPoint2:CGPointMake(300.0*3/4, 300)];CAShapeLayer * shapeLayer = [CAShapeLayer layer];shapeLayer.path = bezierPath.CGPath ;shapeLayer.lineWidth = 3.0 ;
//    shapeLayer.backgroundColor = [UIColor grayColor].CGColor ;shapeLayer.fillColor = [UIColor blueColor].CGColor ;shapeLayer.strokeColor = [UIColor redColor].CGColor ;[self.contentView.layer addSublayer:shapeLayer];// 添加一个滑动的图层CALayer * slipLayer = [CALayer layer];slipLayer.frame = CGRectMake(0, 0, 50, 50);slipLayer.position = CGPointMake(0, 150);slipLayer.contents = (__bridge id)[UIImage imageNamed:@"icon_tmpImageName"].CGImage ;slipLayer.affineTransform = CGAffineTransformRotate(CGAffineTransformIdentity, M_PI_4);[self.contentView.layer addSublayer:slipLayer];// 根据position创建一个(图层的中心点)关建帧动画，CAKeyframeAnimation * keyframeAnimation = [CAKeyframeAnimation animationWithKeyPath:@"position"];keyframeAnimation.duration = 4.0 ;keyframeAnimation.path = bezierPath.CGPath ;keyframeAnimation.repeatCount = 100 ;// 把rotationMode设置=kCAAnimationRotateAuto 根据曲线的切线自动旋转keyframeAnimation.rotationMode = kCAAnimationRotateAuto ;// slipLayer 添加一个动画[slipLayer addAnimation:keyframeAnimation forKey:nil];}- (void)didReceiveMemoryWarning {[super didReceiveMemoryWarning];// Dispose of any resources that can be recreated.
}@end

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