IOS開(kāi)發(fā)基礎(chǔ)之時(shí)鐘的實(shí)現(xiàn)

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// // ViewController.m // 29-時(shí)鐘練習(xí) // // Created by 魯軍 on 2021/2/21. //#import "ViewController.h"@interface ViewController ()@property(nonatomic,weak)CALayer *second;@end@implementation ViewController- (void)viewDidLoad {[super viewDidLoad];//self.view.backgroundColor=[UIColor systemPinkColor];CALayer *clock= [[CALayer alloc] init];clock.bounds= CGRectMake(0, 0, 200, 200);clock.position = CGPointMake(160, 200);clock.contents =(__bridge id)([UIImage imageNamed:@"appleWatcher"].CGImage);clock.cornerRadius = 100;clock.masksToBounds=YES;//創(chuàng)建秒針CALayer *second = [[CALayer alloc] init];second.bounds = CGRectMake(0, 0, 2, 100);second.position = clock.position;second.backgroundColor = [UIColor redColor].CGColor;//錨點(diǎn) 定位點(diǎn)second.anchorPoint = CGPointMake(0.5, 0.8);[self.view.layer addSublayer:clock];[self.view.layer addSublayer:second];self.second = second;// 定時(shí)器/*[NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(timeChange) userInfo:nil repeats:YES];*///顯示連接CADisplayLink *link = [CADisplayLink displayLinkWithTarget:self selector:@selector(timeChange)];[link addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode];[self timeChange]; }-(void)timeChange{CGFloat angle = 2*M_PI/60;NSDate *date = [NSDate date];/*第一種方法NSDateFormatter *formatter = [[NSDateFormatter alloc] init];formatter.dateFormat =@"ss";CGFloat time = [[formatter stringFromDate:date] floatValue];*///第二種方法NSCalendar *cal = [NSCalendar currentCalendar];CGFloat time2= [cal component:NSCalendarUnitSecond fromDate:date];//self.second.affineTransform = CGAffineTransformRotate(self.second.affineTransform, angle);self.second.affineTransform = CGAffineTransformMakeRotation(time2*angle); }@end

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