iOS時鐘實現

#####時鐘實現 #####1.首先來看看整體效果 #####2.先來實現秒針的變化 #####2.1先來看效果圖片 #####2.2添加UIimageView加載圖片，而後添layer

-(void) setUpSecodLayer{
    CALayer *layer=[CALayer layer];
    CGFloat clockW=self.imageView.bounds.size.width;
    layer.position=self.imageView.center;
    layer.anchorPoint=CGPointMake(0.5, 1);
    layer.bounds=CGRectMake(0, 0, 1,clockW*0.5-20);
    layer.backgroundColor=[UIColor redColor].CGColor;
    self.secondLayer=layer;
    [self.view.layer addSublayer:layer];
}

#####2.3添加一個定時器，不停旋轉

- (void)viewDidLoad {
    [super viewDidLoad];
    [self setUpSecodLayer];
        //
    [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(timeChange) userInfo:nil repeats:YES];
}
-(void) timeChange{
    //獲取當前日曆對象
    NSCalendar *calendar=[NSCalendar currentCalendar];
    //獲取日期的組件：年月日時分秒
    //components:須要獲取的日期組件
    //formDate:獲取哪一個日期的組件
    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;
    //
//    NSLog(@"%li",(long)second);
    CGFloat secondAngle=(second*6)*(M_PI*2)/360;
    self.secondLayer.transform=CATransform3DMakeRotation(secondAngle, 0, 0, 1);

}

#####3源代碼詳細地址

• github