iOS时钟开发案例分享

//
// ViewController.m
// 时钟效果
//
// Created by Daniel on 16/4/7.
// Copyright © 2016年 Daniel. All rights reserved.
//
 
#define kClockWH _clockView.bounds.size.width
 
//一秒钟秒针转多少度
#define preSecondA 6
 
//一分钟分针转多少度
#define preMinuteA 6
 
//一小时时针转多少度
#define preHourA 30
 
//每分钟时针转多少度
#define preHourMinute 0.5
 
//每秒钟分针转多少度
#define preMinuteSecond 0.1
 
#define angle2raditon(a) ((a) / 180.0 * M_PI)
 
#import "ViewController.h"
 
@interface ViewController ()
@property (weak, nonatomic) IBOutlet UIImageView *clockView;
 
/** 秒针 */
@property(nonatomic, strong) CALayer *secondL;
 
/** 分针 */
@property(nonatomic, strong) CALayer *minuteL;
 
/** 时针 */
@property(nonatomic, strong) CALayer *hourL;
 
@end
 
@implementation ViewController
 
- (void)viewDidLoad {
 [super viewDidLoad];
  
 //添加时针
 [self setUpHourLayer];
  
 //添加分针
 [self setUpMinuteLayer];
 
 //添加秒针
 [self setUpSecondLayer];
  
 //添加定时器
 [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(timeChange) userInfo:nil repeats:YES];
  
 //开始运行时就获取时间，这样在启动时就不会有停顿的感觉
 [self timeChange];
  
}
 
- (void)timeChange {
  
 //获取当前系统时间
 NSCalendar *calendar = [NSCalendar currentCalendar];
  
 NSDateComponents *cmp = [calendar components:NSCalendarUnitSecond | NSCalendarUnitMinute | NSCalendarUnitHour fromDate:[NSDate date]];
  
 //获取秒
 NSInteger second = cmp.second;
  
 //获取分
 NSInteger minute = cmp.minute;
  
 //获取小时
 NSInteger hour = cmp.hour;
  
 //计算秒针转多少度
 CGFloat secondA = second * preSecondA;
  
 //计算分针转多少度
 CGFloat minuteA = minute * preMinuteA + second * preMinuteSecond;
  
 //计算时针转多少度
 CGFloat hourA = hour * preHourA + minute * preHourMinute;
  
 //旋转秒针
 _secondL.transform = CATransform3DMakeRotation(angle2raditon(secondA), 0, 0, 1);
  
 //旋转分针
 _minuteL.transform = CATransform3DMakeRotation(angle2raditon(minuteA), 0, 0, 1);
  
 //旋转时针
 _hourL.transform = CATransform3DMakeRotation(angle2raditon(hourA), 0, 0, 1);
  
}
 
#pragma mark - 初始化时针
- (void)setUpHourLayer {
  
 CALayer *hourL = [CALayer layer];
  
 //设置秒针背景色
 hourL.backgroundColor = [UIColor blackColor].CGColor;
  
 //设置秒针锚点
 hourL.anchorPoint = CGPointMake(0.5, 1);
  
 //设置秒针锚点在父控件的位置
 hourL.position = CGPointMake(kClockWH * 0.5, kClockWH * 0.5);
  
 hourL.cornerRadius = 4;
  
 //设置秒针bounds
 hourL.bounds = CGRectMake(0, 0, 4, kClockWH * 0.5 - 40);
  
 //把秒针添加到clockView图层上
 [_clockView.layer addSublayer:hourL];
  
 _hourL = hourL;
  
}
 
 
#pragma mark - 初始化分针
- (void)setUpMinuteLayer {
  
 CALayer *minuteL = [CALayer layer];
  
 //设置秒针背景色
 minuteL.backgroundColor = [UIColor blackColor].CGColor;
  
 //设置秒针锚点
 minuteL.anchorPoint = CGPointMake(0.5, 1);
  
 //设置秒针锚点在父控件的位置
 minuteL.position = CGPointMake(kClockWH * 0.5, kClockWH * 0.5);
  
 minuteL.cornerRadius = 4;
  
 //设置秒针bounds
 minuteL.bounds = CGRectMake(0, 0, 4, kClockWH * 0.5 - 20);
  
 //把秒针添加到clockView图层上
 [_clockView.layer addSublayer:minuteL];
  
 _minuteL = minuteL;
  
}
 
#pragma mark - 初始化秒针
- (void)setUpSecondLayer {
  
 CALayer *secondL = [CALayer layer];
  
 //设置秒针背景色
 secondL.backgroundColor = [UIColor redColor].CGColor;
  
 //设置秒针锚点
 secondL.anchorPoint = CGPointMake(0.5, 1);
  
 //设置秒针锚点在父控件的位置
 secondL.position = CGPointMake(kClockWH * 0.5, kClockWH * 0.5);
  
  
 //设置秒针bounds
 secondL.bounds = CGRectMake(0, 0, 1.5, kClockWH * 0.5 - 20);
  
 //把秒针添加到clockView图层上
 [_clockView.layer addSublayer:secondL];
  
 _secondL = secondL;
  
}
 
 
@end