/**
* 将时间点转化成日历形式
*/
- (NSDate *)getCustomDateWithHour:(NSInteger)hour {
//获取当前时间
NSDate * destinationDateNow = [NSDate date];
NSCalendar *currentCalendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *currentComps = [[NSDateComponents alloc] init];
NSInteger unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;
currentComps = [currentCalendar components:unitFlags fromDate:destinationDateNow];
//设置当前的时间点
NSDateComponents *resultComps = [[NSDateComponents alloc] init];
[resultComps setYear:[currentComps year]];
[resultComps setMonth:[currentComps month]];
[resultComps setDay:[currentComps day]];
[resultComps setHour:hour];
NSCalendar *resultCalendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
return [resultCalendar dateFromComponents:resultComps];
}
/**
* 获取时间段
*/
- (NSString *)getTheTimeBucket {
// NSDate * currentDate = [self getNowDateFromatAnDate:[NSDate date]];
NSDate * currentDate = [NSDate date];
if ([currentDate compare:[self getCustomDateWithHour:0]] == NSOrderedDescending && [currentDate compare:[self getCustomDateWithHour:9]] == NSOrderedAscending) {
return @"早上好";
} else if ([currentDate compare:[self getCustomDateWithHour:9]] == NSOrderedDescending && [currentDate compare:[self getCustomDateWithHour:11]] == NSOrderedAscending) {
return @"上午好";
} else if ([currentDate compare:[self getCustomDateWithHour:11]] == NSOrderedDescending && [currentDate compare:[self getCustomDateWithHour:13]] == NSOrderedAscending) {
return @"中午好";
} else if ([currentDate compare:[self getCustomDateWithHour:13]] == NSOrderedDescending && [currentDate compare:[self getCustomDateWithHour:18]] == NSOrderedAscending) {
return @"下午好";
} else {
return @"晚上好";
}
}
/**
* [self getTheTimeBucket] 这样就得到时间段了 扩展 通过[NSDate date]获得的时间可能与当前的系统时间不一样，这是因为时区时差的缘故
* 考虑时区，获取准备的系统时间方法
*/
- (NSDate *)getNowDateFromatAnDate:(NSDate *)anyDate {
//设置源日期时区
NSTimeZone* sourceTimeZone = [NSTimeZone timeZoneWithAbbreviation:@"UTC"];//或GMT
//设置转换后的目标日期时区
NSTimeZone* destinationTimeZone = [NSTimeZone localTimeZone];
//得到源日期与世界标准时间的偏移量
NSInteger sourceGMTOffset = [sourceTimeZone secondsFromGMTForDate:anyDate];
//目标日期与本地时区的偏移量
NSInteger destinationGMTOffset = [destinationTimeZone secondsFromGMTForDate:anyDate];
//得到时间偏移量的差值
NSTimeInterval interval = destinationGMTOffset - sourceGMTOffset;
//转为现在时间
NSDate* destinationDateNow = [[NSDate alloc] initWithTimeInterval:interval sinceDate:anyDate];
return destinationDateNow;
}
