Question

我的应用程序显示根据当前日期更改UILabel的值：

当前实施：

NSDate* todaysdate = [NSDate date];

NSDateComponents *week1startcomp = [[NSDateComponents alloc] init];
[week1startcomp setMonth:8];
[week1startcomp setDay:4];
[week1startcomp setYear:2014];
NSDate* week1start = [[NSCalendar currentCalendar] dateFromComponents:week1startcomp];

NSDateComponents *week1endcomp = [[NSDateComponents alloc] init];
[week1endcomp setMonth:9];
[week1endcomp setDay:4];
[week1endcomp setYear:2014];
NSDate* week1end = [[NSCalendar currentCalendar] dateFromComponents:week1endcomp];

NSDateComponents *week2startcomp = [[NSDateComponents alloc] init];
[week2startcomp setMonth:9];
[week2startcomp setDay:9];
[week2startcomp setYear:2014];
NSDate* week2start = [[NSCalendar currentCalendar] dateFromComponents:week2startcomp];

NSDateComponents *week2endcomp = [[NSDateComponents alloc] init];
[week2endcomp setMonth:9];
[week2endcomp setDay:15];
[week2endcomp setYear:2014];
NSDate* week2end = [[NSCalendar currentCalendar] dateFromComponents:week2endcomp];

NSDateComponents *week3startcomp = [[NSDateComponents alloc] init];
[week3startcomp setMonth:9];
[week3startcomp setDay:16];
[week3startcomp setYear:2014];
NSDate* week3start = [[NSCalendar currentCalendar] dateFromComponents:week3startcomp];

NSDateComponents *week3endcomp = [[NSDateComponents alloc] init];
[week3endcomp setMonth:9];
[week3endcomp setDay:29];
[week3endcomp setYear:2014];
NSDate* week3end = [[NSCalendar currentCalendar] dateFromComponents:week3endcomp];

等等17周：

if([todaysdate compare:week1start] == NSOrderedDescending && [todaysdate compare:week1end]  == NSOrderedAscending){

    NSLog(@"Current week is Week 1");
    _currentWeekLabel.text = @"Currently in Week 1";

}else if([todaysdate compare:week2start] == NSOrderedDescending && [todaysdate compare:week2end]  == NSOrderedAscending){

    NSLog(@"Current week is Week 2");
     _currentWeekLabel.text = @"Currently in Week 2";

}else if([todaysdate compare:week3start] == NSOrderedDescending && [todaysdate compare:week3end]  == NSOrderedAscending){

    NSLog(@"Current week is Week 3");
     _currentWeekLabel.text = @"Currently in Week 3";
    }

有没有更好的方法来实现这一目标？它目前工作正常（除了日期落在范围的第一天或最后一天时的逻辑问题）。

欢迎提出任何建议。

Answer 1

程序几乎相同，它可以帮助您减少代码。写一个像这样的方法：

- (BOOL)date:(NSDate*)date isBetweenDate:(NSDate*)beginDate andDate:(NSDate*)endDate
{
    if ([date compare:beginDate] == NSOrderedAscending)
        return NO;

    if ([date compare:endDate] == NSOrderedDescending) 
        return NO;

    return YES;
}

然后这样做：

if([self date:todaysdate isBetweenDate:week1start andDate:week1end]){

    NSLog(@"Current week is Week 1");
    _currentWeekLabel.text = @"Currently in Week 1";

}else if([self date:todaysdate isBetweenDate:week2start andDate:week2end]){

    NSLog(@"Current week is Week 2");
     _currentWeekLabel.text = @"Currently in Week 2";

}else if([self date:todaysdate isBetweenDate:week3start andDate:week3end]){

    NSLog(@"Current week is Week 3");
     _currentWeekLabel.text = @"Currently in Week 3";
}

希望这会有所帮助.. :)

检查NSdate是否在范围内的更好方法

1 个答案: