钟表

#import "WatchViewController.h"

//钟表图片的高
#define kWatchH self.watchImage.bounds.size.height
//钟表图片的宽
#define kWatchW self.watchImage.bounds.size.width
//秒针每秒转多少度
#define angle_second 6
//分针每分钟转多少度
#define angle_minute 6
//时针每小时转多少度
#define angle_hour 30
//时针每分钟转多少度
#define anglem_minute_hour 0.5

@interface WatchViewController ()
@property (weak, nonatomic) IBOutlet UIImageView *watchImage;
@property (nonatomic ,retain) NSTimer *timer;
@property (nonatomic ,retain) CALayer *secondL;
@property (nonatomic ,retain) CALayer *minuteL;
@property (nonatomic ,retain) CALayer *hourL;
@end

@implementation WatchViewController
- (void)viewDidDisappear:(BOOL)animated
{
    [_timer invalidate];
    _timer = nil;
}
- (void)viewDidLoad
{
    [super viewDidLoad];
    [self setUpHourLayer];
    [self setUpMinuteLayer];
    [self setUpSecondLayer];
    [self timeChange];
    _timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(timeChange) userInfo:nil repeats:YES];
}
- (void)timeChange
{
    NSCalendar *calendar = [NSCalendar currentCalendar];
    
    NSDateComponents *comp = [calendar components:NSCalendarUnitSecond | NSCalendarUnitMinute | NSCalendarUnitHour fromDate:[NSDate date]];
    
    CGFloat com_second = comp.second;
    CGFloat com_minute = comp.minute;
    CGFloat com_hour = comp.hour;
    CGFloat secondA = (angle_second * com_second)/180 *M_PI;
    CGFloat minuteA = (angle_minute * com_minute)/180 *M_PI;
    CGFloat hourA   = ((angle_hour   * com_hour)+com_minute*anglem_minute_hour)/180 *M_PI;
    
    _secondL.transform = CATransform3DMakeRotation(secondA, 0, 0, 1);
    _minuteL.transform = CATransform3DMakeRotation(minuteA, 0, 0, 1);
    _hourL.transform = CATransform3DMakeRotation(hourA, 0, 0, 1);
}
#pragma mark 生成时针
- (void)setUpHourLayer
{
    CALayer *layer = [CALayer layer];
    
    layer.backgroundColor = [UIColor blackColor].CGColor;
    
    layer.anchorPoint = CGPointMake(0.5, 1);
    
    layer.position = CGPointMake(kWatchW * 0.5,kWatchH * 0.5 );
    
    layer.bounds = CGRectMake(0, 0, 4, kWatchH * 0.5 - 30);
    
    _hourL = layer;
    [_watchImage.layer addSublayer:_hourL];
}
#pragma mark 生成分针
- (void)setUpMinuteLayer
{
    CALayer *layer = [CALayer layer];
    
    layer.backgroundColor = [UIColor blackColor].CGColor;
    
    layer.anchorPoint = CGPointMake(0.5, 1);
    
    layer.position = CGPointMake(kWatchW * 0.5,kWatchH * 0.5 );
    
    layer.bounds = CGRectMake(0, 0, 4, kWatchH * 0.5);
    
    _minuteL = layer;
    [_watchImage.layer addSublayer:_minuteL];
}
#pragma mark 生成秒针
- (void)setUpSecondLayer
{
    CALayer *layer = [CALayer layer];
    
    layer.backgroundColor = [UIColor redColor].CGColor;
    
    layer.anchorPoint = CGPointMake(0.5, 1);
    
    layer.position = CGPointMake(kWatchW * 0.5,kWatchH * 0.5 );
    
    layer.bounds = CGRectMake(0, 0, 1, kWatchH * 0.5);
    
    _secondL = layer;
    [_watchImage.layer addSublayer:_secondL];
}