//// ViewController.m// 時(shí)鐘效果//// Created by Daniel on 16/4/7.// Copyright © 2016年 Daniel. All rights reserved.// #define kClockWH _clockView.bounds.size.width //一秒鐘秒針轉(zhuǎn)多少度#define preSecondA 6 //一分鐘分針轉(zhuǎn)多少度#define preMinuteA 6 //一小時(shí)時(shí)針轉(zhuǎn)多少度#define preHourA 30 //每分鐘時(shí)針轉(zhuǎn)多少度#define preHourMinute 0.5 //每秒鐘分針轉(zhuǎn)多少度#define preMinuteSecond 0.1 #define angle2raditon(a) ((a) / 180.0 * M_PI) #import "ViewController.h" @interface ViewController ()@property (weak, nonatomic) IBOutlet UIImageView *clockView; /** 秒針 */@property(nonatomic, strong) CALayer *secondL; /** 分針 */@property(nonatomic, strong) CALayer *minuteL; /** 時(shí)針 */@property(nonatomic, strong) CALayer *hourL; @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad];   //添加時(shí)針 [self setUpHourLayer];   //添加分針 [self setUpMinuteLayer];  //添加秒針 [self setUpSecondLayer];   //添加定時(shí)器 [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(timeChange) userInfo:nil repeats:YES];   //開(kāi)始運(yùn)行時(shí)就獲取時(shí)間，這樣在啟動(dòng)時(shí)就不會(huì)有停頓的感覺(jué) [self timeChange];  } - (void)timeChange {   //獲取當(dāng)前系統(tǒng)時(shí)間 NSCalendar *calendar = [NSCalendar currentCalendar];   NSDateComponents *cmp = [calendar components:NSCalendarUnitSecond | NSCalendarUnitMinute | NSCalendarUnitHour fromDate:[NSDate date]];   //獲取秒 NSInteger second = cmp.second;   //獲取分 NSInteger minute = cmp.minute;   //獲取小時(shí) NSInteger hour = cmp.hour;   //計(jì)算秒針轉(zhuǎn)多少度 CGFloat secondA = second * preSecondA;   //計(jì)算分針轉(zhuǎn)多少度 CGFloat minuteA = minute * preMinuteA + second * preMinuteSecond;   //計(jì)算時(shí)針轉(zhuǎn)多少度 CGFloat hourA = hour * preHourA + minute * preHourMinute;   //旋轉(zhuǎn)秒針 _secondL.transform = CATransform3DMakeRotation(angle2raditon(secondA), 0, 0, 1);   //旋轉(zhuǎn)分針 _minuteL.transform = CATransform3DMakeRotation(angle2raditon(minuteA), 0, 0, 1);   //旋轉(zhuǎn)時(shí)針 _hourL.transform = CATransform3DMakeRotation(angle2raditon(hourA), 0, 0, 1);  } #pragma mark - 初始化時(shí)針- (void)setUpHourLayer {   CALayer *hourL = [CALayer layer];   //設(shè)置秒針背景色 hourL.backgroundColor = [UIColor blackColor].CGColor;   //設(shè)置秒針錨點(diǎn) hourL.anchorPoint = CGPointMake(0.5, 1);   //設(shè)置秒針錨點(diǎn)在父控件的位置 hourL.position = CGPointMake(kClockWH * 0.5, kClockWH * 0.5);   hourL.cornerRadius = 4;   //設(shè)置秒針bounds hourL.bounds = CGRectMake(0, 0, 4, kClockWH * 0.5 - 40);   //把秒針添加到clockView圖層上 [_clockView.layer addSublayer:hourL];   _hourL = hourL;  }  #pragma mark - 初始化分針- (void)setUpMinuteLayer {   CALayer *minuteL = [CALayer layer];   //設(shè)置秒針背景色 minuteL.backgroundColor = [UIColor blackColor].CGColor;   //設(shè)置秒針錨點(diǎn) minuteL.anchorPoint = CGPointMake(0.5, 1);   //設(shè)置秒針錨點(diǎn)在父控件的位置 minuteL.position = CGPointMake(kClockWH * 0.5, kClockWH * 0.5);   minuteL.cornerRadius = 4;   //設(shè)置秒針bounds minuteL.bounds = CGRectMake(0, 0, 4, kClockWH * 0.5 - 20);   //把秒針添加到clockView圖層上 [_clockView.layer addSublayer:minuteL];   _minuteL = minuteL;  } #pragma mark - 初始化秒針- (void)setUpSecondLayer {   CALayer *secondL = [CALayer layer];   //設(shè)置秒針背景色 secondL.backgroundColor = [UIColor redColor].CGColor;   //設(shè)置秒針錨點(diǎn) secondL.anchorPoint = CGPointMake(0.5, 1);   //設(shè)置秒針錨點(diǎn)在父控件的位置 secondL.position = CGPointMake(kClockWH * 0.5, kClockWH * 0.5);     //設(shè)置秒針bounds secondL.bounds = CGRectMake(0, 0, 1.5, kClockWH * 0.5 - 20);   //把秒針添加到clockView圖層上 [_clockView.layer addSublayer:secondL];   _secondL = secondL;  }  @end