//// ViewController.m// 時鐘效果//// Created by Daniel on 16/4/7.// Copyright © 2016年 Daniel. All rights reserved.// #define kClockWH _clockView.bounds.size.width //一秒鐘秒針轉多少度#define preSecondA 6 //一分鐘分針轉多少度#define preMinuteA 6 //一小時時針轉多少度#define preHourA 30 //每分鐘時針轉多少度#define preHourMinute 0.5 //每秒鐘分針轉多少度#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; /** 時針 */@property(nonatomic, strong) CALayer *hourL; @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad];   //添加時針 [self setUpHourLayer];   //添加分針 [self setUpMinuteLayer];  //添加秒針 [self setUpSecondLayer];   //添加定時器 [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(timeChange) userInfo:nil repeats:YES];   //開始運行時就獲取時間，這樣在啟動時就不會有停頓的感覺 [self timeChange];  } - (void)timeChange {   //獲取當前系統時間 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 NSInteger hour = cmp.hour;   //計算秒針轉多少度 CGFloat secondA = second * preSecondA;   //計算分針轉多少度 CGFloat minuteA = minute * preMinuteA + second * preMinuteSecond;   //計算時針轉多少度 CGFloat hourA = hour * preHourA + minute * preHourMinute;   //旋轉秒針 _secondL.transform = CATransform3DMakeRotation(angle2raditon(secondA), 0, 0, 1);   //旋轉分針 _minuteL.transform = CATransform3DMakeRotation(angle2raditon(minuteA), 0, 0, 1);   //旋轉時針 _hourL.transform = CATransform3DMakeRotation(angle2raditon(hourA), 0, 0, 1);  } #pragma mark - 初始化時針- (void)setUpHourLayer {   CALayer *hourL = [CALayer layer];   //設置秒針背景色 hourL.backgroundColor = [UIColor blackColor].CGColor;   //設置秒針錨點 hourL.anchorPoint = CGPointMake(0.5, 1);   //設置秒針錨點在父控件的位置 hourL.position = CGPointMake(kClockWH * 0.5, kClockWH * 0.5);   hourL.cornerRadius = 4;   //設置秒針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];   //設置秒針背景色 minuteL.backgroundColor = [UIColor blackColor].CGColor;   //設置秒針錨點 minuteL.anchorPoint = CGPointMake(0.5, 1);   //設置秒針錨點在父控件的位置 minuteL.position = CGPointMake(kClockWH * 0.5, kClockWH * 0.5);   minuteL.cornerRadius = 4;   //設置秒針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];   //設置秒針背景色 secondL.backgroundColor = [UIColor redColor].CGColor;   //設置秒針錨點 secondL.anchorPoint = CGPointMake(0.5, 1);   //設置秒針錨點在父控件的位置 secondL.position = CGPointMake(kClockWH * 0.5, kClockWH * 0.5);     //設置秒針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