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）

#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:1 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, 1);

// 3.设置位置
hour.position = CGPointMake(imageW * 0.5, imageH * 0.5);

// 4.设置尺寸
hour.bounds = CGRectMake(0, 0, 4, imageH * 0.5 - 50);

// 5.红色
hour.backgroundColor = [UIColor blackColor].CGColor;

hour.cornerRadius = 4;

// 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, 1);

// 3.设置位置
minute.position = CGPointMake(imageW * 0.5, imageH * 0.5);

// 4.设置尺寸
minute.bounds = CGRectMake(0, 0, 2, imageH * 0.5 - 30);

// 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, 1);

// 3.设置位置
second.position = CGPointMake(imageW * 0.5, imageH * 0.5);

// 4.设置尺寸
second.bounds = CGRectMake(0, 0, 1, imageH * 0.5 - 20);

// 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), 0, 0, 1);

// 旋转分针
_minute.transform = CATransform3DMakeRotation(angle2radian(minuteA), 0, 0, 1);

// 旋转时针
_hour.transform = CATransform3DMakeRotation(angle2radian(hourA), 0, 0, 1);

}
@end