手表（锚点）

// ViewController.m

// UI-NO-37-1 模拟手表

// Created by 容伟 on 15/9/16.

#import "ViewController.h"

@interface ViewController ()

{

CALayer *sLayer; // 秒针

CALayer *mLayer; // 分针

CALayer *hLayer; // 时针

}

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

// 表盘

[self addWatchFace];

// 秒针

[self pointLayer];

CADisplayLink *link = [CADisplayLink displayLinkWithTarget:self selector:@selector(fireTime)];

[link addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];

// 定时器调用指针旋转

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

}

// 添加表盘

- (void)addWatchFace {

UIImage *image = [UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"表盘" ofType:@"png"]];

UIImageView *imageView = [[UIImageView alloc] initWithImage:image];

imageView.frame = CGRectMake(0, 0, image.size.width/3, image.size.height/3);

imageView.center = self.view.center;

[self.view addSubview:imageView];

}

- (void)pointLayer {

// 秒针分针时针

UIImage *image = [UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"指针" ofType:@"png"]];

sLayer = [[CALayer alloc] init];

sLayer.bounds = CGRectMake(0, 0, image.size.width/8, image.size.height/4);

sLayer.position = self.view.center;

sLayer.anchorPoint = CGPointMake(0.5, 0.65);

sLayer.contents = (__bridge id)(image.CGImage);

[self.view.layer addSublayer:sLayer];

// 分针

mLayer = [[CALayer alloc] init];

mLayer.bounds = CGRectMake(0, 0, image.size.width/7, image.size.height/5);

mLayer.position = self.view.center;

mLayer.anchorPoint = CGPointMake(0.5, 0.65);

mLayer.contents = (id)image.CGImage;

[self.view.layer addSublayer:mLayer];

// 时针

hLayer = [[CALayer alloc] init];

hLayer.bounds = CGRectMake(0, 0, image.size.width/6, image.size.height/7);

hLayer.position = self.view.center;

hLayer.anchorPoint = CGPointMake(0.5, 0.65);

hLayer.contents = (id)image.CGImage;

[self.view.layer addSublayer:hLayer];

}

// 定时器调用方法

- (void)fireTime {

NSCalendar *calendar = [NSCalendar currentCalendar];

// 获得当前的时间小时

// component:fromDate: 从日历里面的某个日期获得某个组件

NSInteger h =[calendar component:NSCalendarUnitHour fromDate:[NSDate date]];

// NSLog(@"%ld", (long)h);

// 获得当前时间分

NSInteger m =[calendar component:NSCalendarUnitMinute fromDate:[NSDate date]];

// 获得当前时间秒

NSInteger s =[calendar component:NSCalendarUnitSecond fromDate:[NSDate date]];

sLayer.transform = CATransform3DMakeRotation(M_PI/30*s, 0, 0, 1);

#warning 有错

mLayer.transform = CATransform3DMakeRotation(M_PI/30*m + (M_PI/(30*60))*s, 0, 0, 1);

hLayer.transform = CATransform3DMakeRotation(M_PI/6*h + (M_PI/(6*60))*m, 0, 0, 1);

}

- (void)didReceiveMemoryWarning {

[super didReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

@end