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
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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以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持创新互联。
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