获取当前时间:
NSDate *localDate = [NSDate date];
获取UIDatePicker的时间:
NSDate *pickerDate = [self.datePicker date];
NSDate格式转换为NSString格式:
- (NSString*)getSelectedDateStr{
NSDate *pickerDate = [self.datePicker date]; // 获取用户通过UIDatePicker设置的日期和时间
NSDateFormatter*formatter = [[NSDateFormatteralloc]init]; // 创建一个日期格式器
[formattersetDateFormat:@"yyyy-MM-dd HH:mm:ss"];
return [formatterstringFromDate:self.datePicker.date];
}
NSString格式转换为NSDate格式:
- (NSDate *)getDateAction{
NSString *birthdayStr=@"2010-08-04 16:01:03";
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
[dateFormatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:8]];//解决8小时时间差问题
NSDate *date = [dateFormatter dateFromString:birthdayStr];
NSLog(@"*****%@",date);
return date;
}
为UIDatePicker设置最值:
- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor orangeColor];
self.datePicker = [[UIDatePicker alloc]initWithFrame:CGRectMake(0, 80, self.view.frame.size.width, 216)];
self.datePicker.backgroundColor = [UIColor groupTableViewBackgroundColor];
[self.view addSubview:self.datePicker];
[self.datePicker addTarget:self action:@selector(dateChanged:) forControlEvents:UIControlEventValueChanged ];//重点：UIControlEventValueChanged
//设置显示格式
//默认根据手机本地设置显示为中文还是其他语言
NSLocale *locale = [[NSLocale alloc] initWithLocaleIdentifier:@"zh_CN"];//设置为中文显示
self.datePicker.locale = locale;
//当前时间创建NSDate
NSDate *localDate = [NSDate date];
//在当前时间加上的时间：格里高利历
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *offsetComponents = [[NSDateComponents alloc] init];
//设置时间
[offsetComponents setYear:0];
[offsetComponents setMonth:0];
[offsetComponents setDay:5];// 当前时间最多推后5天
[offsetComponents setHour:20];// 最多推后20小时
[offsetComponents setMinute:0];
[offsetComponents setSecond:0];
//设置最大值时间
NSDate *maxDate = [gregorian dateByAddingComponents:offsetComponents toDate:localDate options:0];
//设置属性
self.datePicker.minimumDate = localDate;
self.datePicker.maximumDate = maxDate;
}
UIDatePicker响应事件的实现:
- (void)dateChanged:(id)sender{
UIDatePicker *control = (UIDatePicker*)sender;
NSDate* date = control.date;
//添加你自己响应代码
NSLog(@"dateChanged响应事件：%@",date);
//NSDate格式转换为NSString格式
NSString *dateString = [self getSelectedDateStr];
//打印显示日期时间
NSLog(@"格式化显示时间：%@",dateString);
}
日期比较:
/**
NSComparisonResult的取值
NSOrderedAscending // 升序, 越往右边越大
NSOrderedSame, // 相等
NSOrderedDescending // 降序, 越往右边越小
*/
NSComparisonResult result = [aDate compare:bDate];
if (result == NSOrderedAscending) { // 升序, 越往右边越大
NSLog(@"bDate > aDate");
} else if (result == NSOrderedDescending) { // 降序, 越往右边越小
NSLog(@"aDate > bDate");
} else {
NSLog(@"aDate == bDate");
}
