倒计时demo

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController

@property (strong,nonatomic) UILabel *titleLable;

@property (strong,nonatomic) UILabel *showTimeLable;

@property (strong,nonatomic) UIView *bottomView;

@property (strong,nonatomic) NSString *setTime;

@property (strong,nonatomic) NSArray *timeArr;

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

self.titleLable = [[UILabel alloc] initWithFrame:CGRectMake(88, 40, 200, 140)];

self.titleLable.backgroundColor = [UIColor clearColor];

self.titleLable.numberOfLines = 0;

self.titleLable.textColor = [UIColor purpleColor];

self.titleLable.textAlignment = NSTextAlignmentCenter;

self.titleLable.font = [UIFont systemFontOfSize:30];

[self.view addSubview:self.titleLable];

self.showTimeLable = [[UILabel alloc] initWithFrame:CGRectMake(88, 190, 200, 200)];

self.showTimeLable.backgroundColor = [UIColor grayColor];

self.showTimeLable.textAlignment = NSTextAlignmentCenter;

self.showTimeLable.font = [UIFont systemFontOfSize:30];

self.showTimeLable.numberOfLines = 0;

self.showTimeLable.textColor = [UIColor yellowColor];

self.showTimeLable.layer.cornerRadius = self.showTimeLable.frame.size.width / 2;

self.showTimeLable.clipsToBounds = YES;

[self.view addSubview:self.showTimeLable];

self.setTime = @"2016-6-1";

self.timeArr = [self.setTime componentsSeparatedByString:@"-"];

[self refreshTime];

[NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(refreshTime) userInfo:nil repeats:YES];

}

-(void)refreshTime

{

NSCalendar *laterCalender = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];

NSDateComponents *latercomponents = [[NSDateComponents alloc] init];

latercomponents.year = [self.timeArr[0] integerValue];

latercomponents.month = [self.timeArr[1] integerValue];

latercomponents.day = [self.timeArr [2] integerValue];

NSDate *laterDate = [laterCalender dateFromComponents:latercomponents];

NSDateComponents *betweenDate = [laterCalender components:NSCalendarUnitSecond fromDate:[NSDate date] toDate:laterDate options:0];

if (betweenDate.second < 0) {

self.showTimeLable.text = [self DayHourMunintSecond:-betweenDate.second];

self.titleLable.text = [NSString stringWithFormat:@"距离\n%@\n已经过时",self.setTime];

}

else{

self.showTimeLable.text = [self DayHourMunintSecond:betweenDate.second];

self.titleLable.text = [NSString stringWithFormat:@"距离\n%@\n结课还有",self.setTime];

}

}

-(NSString *)DayHourMunintSecond:(NSInteger)time

{

NSString *timeString;

timeString = [NSString stringWithFormat:@"%ld秒",time % 60];

time /= 60;

if (time > 0) {

timeString = [NSString stringWithFormat:@"%ld分\n%@",time % 60,timeString];

}

time /= 60;

if (time > 0) {

timeString = [NSString stringWithFormat:@"%ld时\n%@",time % 24,timeString];

}

time /= 24;

if (time > 0) {

timeString = [NSString  stringWithFormat:@"%ld天\n%@",time,timeString];

}

return timeString;

}