年月日, 周几, 分秒, 代码
NSDate *date = [NSDate date];
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *comps;
// 年月日获得
comps = [calendar components:(NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit)
fromDate:date];
NSInteger year = [comps year];
NSInteger month = [comps month];
NSInteger day = [comps day];
NSLog(@"year: %d month: %d, day: %d", year, month, day);
//当前的时分秒获得
comps = [calendar components:(NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit)
fromDate:date];
NSInteger hour = [comps hour];
NSInteger minute = [comps minute];
NSInteger second = [comps second];
NSLog(@"hour: %d minute: %d second: %d", hour, minute, second);
// 周几和星期几获得
comps = [calendar components:(NSWeekCalendarUnit | NSWeekdayCalendarUnit | NSWeekdayOrdinalCalendarUnit)
fromDate:date];
NSInteger week = [comps week]; // 今年的第几周
NSInteger weekday = [comps weekday]; // 星期几（注意，周日是“1”，周一是“2”。。。。）
NSInteger weekdayOrdinal = [comps weekdayOrdinal]; // 这个月的第几周
NSLog(@"week: %d weekday: %d weekday ordinal: %d", week, weekday, weekdayOrdinal);
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
if(dateSwitch.on)
[dateFormatter setDateFormat:@"dd-MMM-yyy,hh:mm:ss"];
else
[dateFormatter setDateFormat:@"hh:mm:ss"];
labelTime.text = [dateFormatter stringFromDate:[NSDate date]];
labelTime.font = [UIFont systemFontOfSize:fontSlider.value];
[dateFormatter release];
教科书代码 用 UISwitch UISlider 控制大小 和显示格式