#import "ViewController.h"@interface ViewController ()/** <#注释#> */@property (nonatomic, weak)  CALayer *layer;@property (weak, nonatomic) IBOutlet UIView *redView;@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];            CALayer *layer = [CALayer layer];    layer.backgroundColor = [UIColor redColor].CGColor;    layer.frame = CGRectMake(50, 50, 100, 100);    self.layer = layer;    [self.view.layer addSublayer:layer];        }-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {        //只有非根层才有隐式动画,(自己手动创建的图片)    [CATransaction begin];    [CATransaction setDisableActions:NO];//此属性可设置关掉隐士动画    [CATransaction setAnimationDuration:5];    self.layer.backgroundColor = [UIColor greenColor].CGColor;    [CATransaction commit];        self.layer.bounds = CGRectMake(0, 0, 90, 90);    self.layer.backgroundColor = [UIColor greenColor].CGColor;    self.layer.position = CGPointMake(100, 400);            self.redView.layer.position = CGPointMake(300, 400);    self.redView.layer.bounds = CGRectMake(0, 0, 100, 100);    self.redView.layer.backgroundColor = [UIColor greenColor].CGColor;    }@end

#import "ViewController.h"//每一秒旋转的度数#define perSecA 6//每一分旋转的度数#define perMinA 6//每一小时旋转的度数#define perHourA 30//每一分,时针旋转的度数#define perMinHour 0.5#define angle2Rad(angle) ((angle) / 180.0 * M_PI)@interface ViewController ()@property (weak, nonatomic) IBOutlet UIImageView *colockView;/** 当前的秒针 */@property (nonatomic, weak)   CALayer *secL;/** 当前的分针 */@property (nonatomic, weak)   CALayer *minL;/** 当前的针针 */@property (nonatomic, weak)   CALayer *hourL;@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    //添加时针    [self setHour];        //添加分针    [self setMin];    //添加秒针    [self setSec];            //添加定时器：scheduledTimerWithTimeInterval不用加到runLoop，因为已经默认添加到了runLoop    [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(timeChange) userInfo:nil repeats:YES];    //添加的定时器不会立即执行，而是过一秒才会执行，此时可以调用定时器的fire方法，立即执行，也可以手动调用定时器的方法    [self timeChange];}//第一称调用一次- (void)timeChange {                NSCalendar *cal = [NSCalendar currentCalendar];    //components:日历的组件,年,月,日 ,时,分,秒.    //fromDate:从什么时间开始获取    NSDateComponents *cmp = [cal components:NSCalendarUnitSecond | NSCalendarUnitMinute | NSCalendarUnitHour  fromDate:[NSDate date]];    //获取当前多少秒    NSInteger curSec = cmp.second + 1;            //秒针开始旋转    //计算秒针当前旋转的角度.    //angle  = 当前多少秒 * 每一秒旋转多少度.    /**     *    CATransform3DMakeRotation:3D旋转：1：必须是在layear层才能进行3D旋转，用transform，旋转的角度为弧度制，2：#define angle2Rad(angle) ((angle) / 180.0 * M_PI) 3：分xyz轴，     */    CGFloat secA = curSec * perSecA;    self.secL.transform = CATransform3DMakeRotation(angle2Rad(secA), 0, 0, 1);            //获取当前多少秒    NSInteger curMin = cmp.minute;    NSLog(@"%ld",curMin);    //分针开始旋转    //计算分针当前旋转的角度.    //angle  = 当前多少分 * 每一分旋转多少度.    CGFloat minA = curMin * perMinA;    self.minL.transform = CATransform3DMakeRotation(angle2Rad(minA), 0, 0, 1);        //获取当前是多少小时    NSInteger curHour = cmp.hour;    NSLog(@"%ld",curMin);    //分针开始旋转    //计算分针当前旋转的角度.    //angle  = 当前多少小时 * 每一小时旋转多少度.    CGFloat hourA = curHour * perHourA + curMin * perMinHour;    self.hourL.transform = CATransform3DMakeRotation(angle2Rad(hourA), 0, 0, 1);        }/** *  1:搭建时针秒针分针的UI效果：1：UIView和CALayear是一样的效果，但是UIView比CALyear多了一个处理点击事件，则CALyear相对于UIView来说更加轻量级，更加高效 2：非根层的layear也就是自己创建的layear都存在隐士动画，要关闭隐式动画，用动画事物CATransaction去关闭：    开启事务     [CATransaction begin];     设置事务没有动画     [CATransaction setDisableActions:YES];     设置动画执行的时长     [CATransaction setAnimationDuration:2];     提交事务     [CATransaction commit];   3：无论是旋转,缩放都是绕着锚点进行的.也就是默认情况下是绕着中心点center进行的。所以要改变其绕着最后的节点旋转，需要先定义好layear的position，在定义锚点，最后的效果是锚点与point点重合。position的位置为表盘的中心点，锚点的默认位置为0.5 ，0.5,修改表盘的锚点位置让锚点与position点重合，这样旋转的时候就会绕着锚点旋转。再把此layear添加到表盘的layear上。 * * *///添加秒针//无论是旋转,缩放都是绕着锚点进行的.- (void)setSec {        CALayer *secL = [CALayer layer];    secL.bounds = CGRectMake(0, 0, 1, 80);    secL.backgroundColor = [UIColor redColor].CGColor;    secL.anchorPoint = CGPointMake(0.5, 1);    secL.position = CGPointMake(self.colockView.bounds.size.width * 0.5, self.colockView.bounds.size.height * 0.5);    [self.colockView.layer addSublayer:secL];    self.secL = secL;    }//添加分针- (void)setMin {        CALayer *minL = [CALayer layer];    minL.bounds = CGRectMake(0, 0, 3, 70);    minL.backgroundColor = [UIColor blackColor].CGColor;    minL.anchorPoint = CGPointMake(0.5, 1);    minL.cornerRadius = 1.5;    minL.position = CGPointMake(self.colockView.bounds.size.width * 0.5, self.colockView.bounds.size.height * 0.5);    [self.colockView.layer addSublayer:minL];    self.minL = minL;    }//时针- (void)setHour {        CALayer *hourL = [CALayer layer];    hourL.bounds = CGRectMake(0, 0, 3, 50);    hourL.backgroundColor = [UIColor blackColor].CGColor;    hourL.anchorPoint = CGPointMake(0.5, 1);    hourL.cornerRadius = 1.5;    hourL.position = CGPointMake(self.colockView.bounds.size.width * 0.5, self.colockView.bounds.size.height * 0.5);    [self.colockView.layer addSublayer:hourL];    self.hourL = hourL;    }//-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {////    //所有旋转,缩放,都是绕着锚点进行.//    self.secL.transform = CATransform3DMakeRotation(M_PI, 0, 0, 1);//}@end