0125——时钟

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#import "ViewController.h"

@interface ViewController ()
@property (nonatomic,strong) CALayer *hourLayer;
@property (nonatomic,strong) CALayer *minLayer;
@property (nonatomic,strong) CALayer *secLayer;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    //创建时针，分针，秒针；
    self.hourLayer= [CALayer layer];
    _hourLayer.backgroundColor = [UIColor blackColor].CGColor;
    _hourLayer.bounds = CGRectMake(0, 0, 4, 40);
    _hourLayer.position = self.view.center;
    _hourLayer.anchorPoint = CGPointMake(0.5, 0.8);
    
    [self.view.layer addSublayer:_hourLayer];
    
    self.minLayer = [CALayer layer];
    _minLayer.backgroundColor = [UIColor blackColor].CGColor;
    _minLayer.bounds = CGRectMake(0,  0, 2, 70);
    _minLayer.position = self.view.center;
    _minLayer.anchorPoint = CGPointMake(0.5, 0.8);
    [self.view.layer addSublayer:_minLayer];
    
    self.secLayer = [CALayer layer];
    _secLayer.backgroundColor = [UIColor redColor].CGColor;
    _secLayer.bounds = CGRectMake(0, 0, 2, 90);
    _secLayer.position = self.view.center;
    _secLayer.anchorPoint = CGPointMake(0.5, 0.8);
    [self.view.layer addSublayer:_secLayer];
    
    //创建中心点
    CALayer *centerLayer = [CALayer layer];
    centerLayer.bounds = CGRectMake(0, 0 , 8, 8);
    centerLayer.cornerRadius = 4;
    centerLayer.backgroundColor = [UIColor blackColor].CGColor;
    centerLayer.position = self.view.center;
    [self.view.layer addSublayer:centerLayer];
    
    //获取当前时间
    NSDate *nowDate = [NSDate date];
    NSDateFormatter *formater = [NSDateFormatter new];
    formater.dateFormat  = @"K:m:s";
    NSString *dateString = [formater stringFromDate:nowDate];
    
    //对时间按照：进行分离
    NSArray *numsArray = [dateString componentsSeparatedByString:@":"];
    
    //取出数组中的数字，设置对应的时分秒针旋转度数
    int hour = [[numsArray objectAtIndex:0]intValue];
    int min = [[numsArray objectAtIndex:1]intValue];
    int sec = [[numsArray objectAtIndex:2]intValue];
    //时针
    _hourLayer.transform = CATransform3DRotate(_hourLayer.transform, (hour + min/60.0)*30.0/180.0*M_PI , 0, 0, 1);
    
    //分针
    _minLayer.transform = CATransform3DRotate(_minLayer.transform, (min + sec/60.0)*6.0/180.0*M_PI, 0, 0, 1);
    
    //秒针
    _secLayer.transform = CATransform3DRotate(_secLayer.transform, sec*6/180.0 *M_PI, 0, 0, 1);
    
    [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(rotate) userInfo:nil repeats:YES];
    

}

　//旋转
-(void)rotate{
    _secLayer.transform = CATransform3DRotate(_secLayer.transform, 6/180.0 * M_PI, 0, 0, 1);
    _minLayer.transform = CATransform3DRotate(_minLayer.transform, (6/60.0)/180.0 *M_PI, 0, 0, 1);
    _hourLayer.transform  = CATransform3DRotate(_hourLayer.transform, (30/3600.0)/180.0 *M_PI, 0, 0, 1);
}



@end

0125——时钟

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原文地址：http://www.cnblogs.com/damonWq/p/5158564.html