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IOS学习笔记之十七 (NSDate、NSDateFormatter、NSCalendar、NSDateComponents、NSTimer)
1、NSDate
时间与日期的初始化,主要有
[NSDate date];
2、NSDateFormatter
主要用于NSString和Date之间相互转化
//NSDate转NSString
stringFromDate:dt
//NSString转NSDate
dateFromString
3、NSCalendar和NSDateComponents
Date打印出具体时间的年月日和把年月日转化为Date
4、NSTimer
定时器
+ (NSTimer *)timerWithTimeInterval:(NSTimeInterval)ti invocation:(NSInvocation *)invocation repeats:(BOOL)yesOrNo;
+ (NSTimer *)scheduledTimerWithTimeInterval:(NSTimeInterval)ti invocation:(NSInvocation *)invocation repeats:(BOOL)yesOrNo;
+ (NSTimer *)timerWithTimeInterval:(NSTimeInterval)ti target:(id)aTarget selector:(SEL)aSelector userInfo:(nullable id)userInfo repeats:(BOOL)yesOrNo;
+ (NSTimer *)scheduledTimerWithTimeInterval:(NSTimeInterval)ti target:(id)aTarget selector:(SEL)aSelector userInfo:(nullable id)userInfo repeats:(BOOL)yesOrNo;
5、测试Demo
main.m文件
int main(int argc, char * argv[]) {
@autoreleasepool {
//NSDate常用方法
NSDate *date = [NSDate date];
NSLog(@"%@", date);
NSDate *date1 = [[NSDate alloc] initWithTimeIntervalSinceNow:3600 * 24];
NSLog(@"date1 is %@", date1);
NSDate *date2 = [[NSDate alloc] initWithTimeIntervalSinceNow:-3 * 3600 * 24];
NSLog(@"date1 is %@", date2);
NSLocale *cn = [NSLocale currentLocale];
NSLog(@"%@", [date1 descriptionWithLocale:cn]);
NSLog(@"%@", [date1 earlierDate:date2]);
//NSDate转NSString
NSDate *dt = [NSDate dateWithTimeIntervalSince1970:3600 * 24 * 366 * 20];
NSDate *dt1 = [NSDate dateWithTimeIntervalSince1970:0];
NSLog(@"%@", dt1);
NSDateFormatter *df = [[NSDateFormatter alloc] init];
[df setDateFormat:@"公元yyyy年MM月DD日 HH时mm分"];
NSLog(@"%@", [df stringFromDate:dt]);
//NSString转NSDate
NSString *str = @"2018-03-02";
NSDateFormatter *df1 = [[NSDateFormatter alloc] init];
[df1 setDateFormat:@"yyyy-MM-dd"];
NSLog(@"%@", [df1 dateFromString:str]);
//NSCalendar和NSDateComponents使用
NSCalendar *car = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDate *date3 = [NSDate date];
unsigned unit = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit | NSWeekdayCalendarUnit;
NSDateComponents *comp = [car components:unit fromDate:date3];
NSLog(@"现在是%ld年", comp.year);
NSLog(@"现在是%ld月", comp.month);
NSLog(@"现在是%ld日", comp.day);
NSLog(@"现在是%ld时", comp.hour);
NSLog(@"现在是%ld分", comp.minute);
NSLog(@"现在是%ld秒", comp.second);
NSLog(@"现在是星期%ld", comp.weekday);
NSDateComponents *comp1 = [[NSDateComponents alloc] init];
comp1.year = 2015;
comp1.month = 4;
comp1.day = 5;
comp1.hour = 18;
comp1.minute = 34;
NSDate *date4 = [car dateFromComponents:comp1];
NSLog(@"date is %@:", date4);
return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
}
}
ViewControl.m文件(这里实现的定时器)
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Control *control = [Control new];
// control.delegate = self;
// [control willShowAlert];
NSTimer* timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(Timered:) userInfo:nil repeats:YES];
}
- (void)Timered:(NSTimer*)timer {
NSLog(@"hello chenyu");
}
@end
6、运行的结果
2018-07-12 23:03:31.634870+0800 cyTest[37918:6787840] hello chenyu
2018-07-12 23:03:32.634915+0800 cyTest[37918:6787840] hello chenyu
2018-07-12 23:03:33.634881+0800 cyTest[37918:6787840] hello chenyu
2018-07-12 23:03:34.634938+0800 cyTest[37918:6787840] hello chenyu
2018-07-12 23:03:35.634998+0800 cyTest[37918:6787840] hello chenyu
2018-07-12 23:03:36.635095+0800 cyTest[37918:6787840] hello chenyu
2018-07-12 23:03:37.635086+0800 cyTest[37918:6787840] hello chenyu
2018-07-12 23:14:23.789640+0800 cyTest[38218:6796894] Thu Jul 12 23:14:23 2018
2018-07-12 23:14:23.790844+0800 cyTest[38218:6796894] date1 is Fri Jul 13 23:14:23 2018
2018-07-12 23:14:23.791492+0800 cyTest[38218:6796894] date1 is Mon Jul 9 23:14:23 2018
2018-07-12 23:14:23.804598+0800 cyTest[38218:6796894] Friday, July 13, 2018 at 11:14:23 PM China Standard Time
2018-07-12 23:14:23.804853+0800 cyTest[38218:6796894] Mon Jul 9 23:14:23 2018
2018-07-12 23:14:23.805346+0800 cyTest[38218:6796894] Thu Jan 1 08:00:00 1970
2018-07-12 23:14:23.805927+0800 cyTest[38218:6796894] 公元1990年01月16日 08时00分
2018-07-12 23:14:23.808330+0800 cyTest[38218:6796894] Fri Mar 2 00:00:00 2018
2018-07-12 23:14:23.808982+0800 cyTest[38218:6796894] 现在是2018年
2018-07-12 23:14:23.809150+0800 cyTest[38218:6796894] 现在是7月
2018-07-12 23:14:23.809354+0800 cyTest[38218:6796894] 现在是12日
2018-07-12 23:14:23.809558+0800 cyTest[38218:6796894] 现在是23时
2018-07-12 23:14:23.809684+0800 cyTest[38218:6796894] 现在是14分
2018-07-12 23:14:23.809834+0800 cyTest[38218:6796894] 现在是23秒
2018-07-12 23:14:23.810407+0800 cyTest[38218:6796894] 现在是星期5
2018-07-12 23:14:23.811211+0800 cyTest[38218:6796894] date is Sun Apr 5 18:34:00 2015:
2018-07-12 23:14:27.764633+0800 cyTest[38218:6796894] hello chenyu
2018-07-12 23:14:28.764758+0800 cyTest[38218:6796894] hello chenyu
2018-07-12 23:14:29.765776+0800 cyTest[38218:6796894] hello chenyu
2018-07-12 23:14:30.765792+0800 cyTest[38218:6796894] hello chenyu
2018-07-12 23:14:31.765426+0800 cyTest[38218:6796894] hello chenyu
作者：chen.yu
深信服三年半工作经验，目前就职游戏厂商，希望能和大家交流和学习,
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