IOS第18天(4,核心动画,时钟效果，定时器，图片旋转角度，CALayer 锚点，获取当前，小时，秒，分）

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#import "HMViewController.h"
 
// 每秒秒针转6度
#define perSecendA 6
 
// 每分钟分针转6度
#define perMinuteA 6
 
// 每小时时针转6度
#define perHourA 30
 
// 每分钟时针转6度
#define perMinuteHourA 0.5
 
#define angle2radian(x) ((x) / 180.0 * M_PI)
 
@interface HMViewController ()
{
    CALayer *_second;
    CALayer *_minute;
    CALayer *_hour;
}
@property (weak, nonatomic) IBOutlet UIView *redView;
@property (weak, nonatomic) IBOutlet UIImageView *clockView;
 
@end
 
@implementation HMViewController
 
- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    // 1.添加秒针
    [self addSecond];
 
    // 2.添加分针
    [self addMintue];
 
    // 3.添加时针
    [self addHour];
 
    // 创建定时器
    [NSTimer scheduledTimerWithTimeInterval: target:self selector:@selector(update) userInfo:nil repeats:YES];
 
    [self update];
}
 
- (void)addHour
{
    CGFloat imageW = _clockView.bounds.size.width;
    CGFloat imageH = _clockView.bounds.size.height;
 
    // 1.添加时针
    CALayer *hour = [CALayer layer];
 
    // 2.设置锚点
    hour.anchorPoint = CGPointMake(0.5, );
 
    // 3.设置位置
    hour.position = CGPointMake(imageW * 0.5, imageH * 0.5);
 
    // 4.设置尺寸
    hour.bounds = CGRectMake(, , , imageH * 0.5 - );
 
    // 5.红色
    hour.backgroundColor = [UIColor blackColor].CGColor;
 
    hour.cornerRadius = ;
 
    // 添加到图层上
    [_clockView.layer addSublayer:hour];
 
    _hour = hour;
}
 
// 添加分针
- (void)addMintue
{
    CGFloat imageW = _clockView.bounds.size.width;
    CGFloat imageH = _clockView.bounds.size.height;
 
    // 1.添加分针
    CALayer *minute = [CALayer layer];
 
    // 2.设置锚点
    minute.anchorPoint = CGPointMake(0.5, );
 
    // 3.设置位置
    minute.position = CGPointMake(imageW * 0.5, imageH * 0.5);
 
    // 4.设置尺寸
    minute.bounds = CGRectMake(, , , imageH * 0.5 - );
 
    // 5.红色
    minute.backgroundColor = [UIColor blueColor].CGColor;
 
    // 添加到图层上
    [_clockView.layer addSublayer:minute];
 
    _minute = minute;
}
 
// 添加秒针
- (void)addSecond
{
    CGFloat imageW = _clockView.bounds.size.width;
    CGFloat imageH = _clockView.bounds.size.height;
 
    // 1.添加秒针
    CALayer *second = [CALayer layer];
 
    // 2.设置锚点
    second.anchorPoint = CGPointMake(0.5, );
 
    // 3.设置位置
    second.position = CGPointMake(imageW * 0.5, imageH * 0.5);
 
    // 4.设置尺寸
    second.bounds = CGRectMake(, , , imageH * 0.5 - );
 
    // 5.红色
    second.backgroundColor = [UIColor redColor].CGColor;
 
    // 添加到图层上
    [_clockView.layer addSublayer:second];
 
    _second = second;
}
 
- (void)update
{
    // 获取秒数
    // 获取日历对象
    NSCalendar *calendar = [NSCalendar currentCalendar];
 
    // 获取日期组件
    NSDateComponents *compoents = [calendar components:NSCalendarUnitSecond | NSCalendarUnitMinute | NSCalendarUnitHour fromDate:[NSDate date]];
 
    // 获取秒数
    CGFloat sec = compoents.second;
 
    // 获取分钟
    CGFloat minute = compoents.minute;
 
    // 获取小时
    CGFloat hour = compoents.hour;
 
    // 算出秒针旋转多少°
    CGFloat secondA = sec * perSecendA;
 
    // 算出分针旋转多少°
    CGFloat minuteA = minute * perMinuteA;
 
    // 算出时针旋转多少°
    CGFloat hourA = hour * perHourA;
    hourA += minute * perMinuteHourA;
 
    // 旋转秒针
    _second.transform = CATransform3DMakeRotation(angle2radian(secondA), , , );
 
    // 旋转分针
    _minute.transform = CATransform3DMakeRotation(angle2radian(minuteA), , , );
 
    // 旋转时针
    _hour.transform = CATransform3DMakeRotation(angle2radian(hourA), , , );
 
}
@end