iOS实现简易钟表

本文实例为大家分享了iOS实现简易钟表的具体代码，供大家参考，具体内容如下

效果图：

注意：表盘是一个UIImageView控件，设置image为表盘图片

核心代码：

//
// ViewController.m
// 时钟
//
// Created by llkj on 2017/8/29.
// Copyright © 2017年 LayneCheung. All rights reserved.
//

#import "ViewController.h"

//每一秒旋转多少度
#define perSecA 6
//每一分旋转多少度
#define perMinA 6
//每一小时旋转多少度
#define perHourA 30

//每一分时针旋转的度数
#define perMinHour 0.5
//角度转弧度
#define angle2Rad(angle) ((angle) / 180.0 * M_PI)
@interface ViewController ()

@property (weak, nonatomic) IBOutlet UIImageView *clockView;
@property (nonatomic, weak) CALayer *secL;
@property (nonatomic, weak) CALayer *minL;
@property (nonatomic, weak) CALayer *hourL;
@end

@implementation ViewController

- (void)viewDidLoad {
  [super viewDidLoad];

  [self setHour];
  [self setMin];
  [self setSec];

  [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(timeChange) userInfo:nil repeats:YES];
  [self timeChange];
}

- (void)timeChange{

  //获取当前秒
  NSCalendar *cal = [NSCalendar currentCalendar];
  NSDateComponents *cmp = [cal components:NSCalendarUnitSecond | NSCalendarUnitMinute | NSCalendarUnitHour fromDate:[NSDate date]];
  NSInteger curSec = cmp.second + 1;
  NSInteger curMin = cmp.minute;
  NSInteger curHour = cmp.hour;

  //秒针开始旋转
  //计算秒针当前旋转的角度
  // angle = 当前多少秒 * 每一秒旋转多少度
  CGFloat secA = curSec * perSecA;
  //旋转方向是Z轴
  self.secL.transform = CATransform3DMakeRotation(angle2Rad(secA), 0, 0, 1);

  //分针开始旋转
  //计算分针当前旋转的角度
  // angle = 当前多少分 * 每一分旋转多少度
  CGFloat minA = curMin * perMinA;
  self.minL.transform = CATransform3DMakeRotation(angle2Rad(minA), 0, 0, 1);

  //时针开始旋转
  //计算时针当前旋转的角度
  // angle = 当前多少时 * 每一小时旋转多少度
  CGFloat hourA = curHour * perHourA + curMin * perMinHour;

  self.hourL.transform = CATransform3DMakeRotation(angle2Rad(hourA), 0, 0, 1);
}
//添加秒针
- (void)setSec{

  CALayer *secL = [CALayer layer];
  secL.bounds = CGRectMake(0, 0, 1, 80);
  secL.backgroundColor = [UIColor redColor].CGColor;
  //绕着锚点旋转
  secL.anchorPoint = CGPointMake(0.5, 1);
  secL.position = CGPointMake(self.clockView.bounds.size.width * 0.5, self.clockView.bounds.size.height * 0.5);
  [self.clockView.layer addSublayer:secL];
  self.secL = secL;

}

//添加分针
- (void)setMin{

  CALayer *minL = [CALayer layer];
  minL.bounds = CGRectMake(0, 0, 3, 70);
  minL.cornerRadius = 1.5;
  minL.backgroundColor = [UIColor blackColor].CGColor;
  minL.anchorPoint = CGPointMake(0.5, 1);
  minL.position = CGPointMake(self.clockView.bounds.size.width * 0.5, self.clockView.bounds.size.height * 0.5);
  [self.clockView.layer addSublayer:minL];
  self.minL = minL;

}

//添加时针
- (void)setHour{

  CALayer *hourL = [CALayer layer];
  hourL.bounds = CGRectMake(0, 0, 3, 60);
  hourL.backgroundColor = [UIColor blackColor].CGColor;
  hourL.anchorPoint = CGPointMake(0.5, 1);
  hourL.position = CGPointMake(self.clockView.bounds.size.width * 0.5, self.clockView.bounds.size.height * 0.5);
  [self.clockView.layer addSublayer:hourL];
  self.hourL = hourL;

}
- (void)didReceiveMemoryWarning {
  [super didReceiveMemoryWarning];
  // Dispose of any resources that can be recreated.
}

@end

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