核心动画——CAAnimation

#import "ViewController.h"

#define Angle(a) (a)*M_PI/180
#define SAngle 6 //每秒旋转多少度

@interface ViewController ()
{
    CALayer *layer;
    float s;
}

@property(nonatomic,strong)CALayer *pointLayer;
@property(nonatomic,strong)CALayer *minuteLayer;
@property(nonatomic,strong)CALayer *SecondtLayer;

@end


@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    //**图层不能跟用户交互，不能添加响应事件
    //初始化CALayer  addSubLayer:添加到父图层的方法
    /*
    layer = [CALayer layer];
    layer.frame = CGRectMake(0, 0, 100, 100);
    layer.cornerRadius = 50;
    layer.backgroundColor = [UIColor yellowColor].CGColor;
    [self.view.layer addSublayer:layer];
    */
    
    
    UIImageView *image = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.width)];
    image.image = [UIImage imageNamed:@"biaopan"];
    image.contentMode = UIViewContentModeScaleAspectFit;
    image.center = self.view.center;
    [self.view addSubview:image];
    
    
    self.SecondtLayer.anchorPoint = CGPointMake(0.5, 0.9);
    self.SecondtLayer.contents = (id)[UIImage imageNamed:@"miaozhen"].CGImage;
    
    self.minuteLayer.anchorPoint = CGPointMake(0.5, 0.9);
    self.minuteLayer.contents = (id)[UIImage imageNamed:@"fenzhen"].CGImage;
    
    self.pointLayer.anchorPoint = CGPointMake(0.5, 0.9);
    //图层上要的是颜色CGColorRef 图片CGImageRef
    self.pointLayer.contents = (id)[UIImage imageNamed:@"shizhen"].CGImage;
    [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(start) userInfo:nil repeats:YES];
}

- (void)start{
    
    //日历的一个类NSCalendar 获得年月日时分秒
    //NSDateComponents 组件
    
    NSCalendar *calendar = [NSCalendar currentCalendar];
    ///(NSCalendarUnit)需要的组件  获得哪个日期的组件
    NSDateComponents *component = [calendar components:NSCalendarUnitHour|NSCalendarUnitMinute|NSCalendarUnitSecond fromDate:[NSDate date]];
    
    s = component.second*SAngle;
    self.SecondtLayer.transform = CATransform3DMakeRotation(Angle(s),0, 0, 1);
    self.SecondtLayer.anchorPoint = CGPointMake(0.5, 0.9);
    self.SecondtLayer.contents = (id)[UIImage imageNamed:@"miaozhen"].CGImage;
    
    float m = component.minute*SAngle;
    self.minuteLayer.transform = CATransform3DMakeRotation(Angle(m),0, 0, 1);
    self.minuteLayer.anchorPoint = CGPointMake(0.5, 0.9);
    self.minuteLayer.contents = (id)[UIImage imageNamed:@"fenzhen"].CGImage;
    
    float h = component.hour*SAngle;
    self.pointLayer.transform = CATransform3DMakeRotation(Angle(h), 0, 0, 1);
    self.pointLayer.anchorPoint = CGPointMake(0.5, 0.9);
    self.pointLayer.contents = (id)[UIImage imageNamed:@"shizhen"].CGImage;
}

- (CALayer *)pointLayer{
    if (_pointLayer) {
        return _pointLayer;
    }
    _pointLayer = [CALayer layer];
    _pointLayer.bounds = CGRectMake(0, 0, 29, 200);
    _pointLayer.position = self.view.center;
    [self.view.layer addSublayer:_pointLayer];
    return _pointLayer;
}

- (CALayer *)minuteLayer{
    if (_minuteLayer) {
        return _minuteLayer;
    }
    _minuteLayer = [CALayer layer];
    _minuteLayer.bounds = CGRectMake(0, 0, 21, 210);
    _minuteLayer.position = self.view.center;
    [self.view.layer addSublayer:_minuteLayer];
    return _minuteLayer;
}

- (CALayer *)SecondtLayer{
    if (_SecondtLayer) {
        return _SecondtLayer;
    }
    _SecondtLayer = [CALayer layer];
    _SecondtLayer.bounds = CGRectMake(0, 0, 21, 230);
    _SecondtLayer.position = self.view.center;
    [self.view.layer addSublayer:_SecondtLayer];
    return _SecondtLayer;
}

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    /*
    UITouch *touch = [touches anyObject];
    layer.position = [touch locationInView:self.view];
    CGFloat width = CGRectGetWidth(layer.bounds)!= 100?100:25;
    layer.bounds = CGRectMake(0, 0, width, width);
    
    CGColorRef color = [UIColor lightGrayColor].CGColor != layer.backgroundColor?[UIColor lightGrayColor].CGColor:[UIColor yellowColor].CGColor;
    layer.backgroundColor = color;
    layer.shadowColor = [UIColor blackColor].CGColor;
    layer.geometryFlipped = YES;
    layer.cornerRadius = layer.cornerRadius != 50?50:0;
    //图层的透明度
    layer.opacity = 0;
    */
    
    //緢点
    self.SecondtLayer.transform = CATransform3DMakeRotation(Angle(Angle(60)), 0, 0, 1);
    self.minuteLayer.transform = CATransform3DMakeRotation(Angle(s/60), 0, 0, 1);
    self.pointLayer.transform = CATransform3DMakeRotation(Angle(s/360), 0, 0, 1);
    
    
}

- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    
    //layer.opacity = 1;
    self.pointLayer.transform = CATransform3DIdentity;
    
}


@end