如何获得一个月的周数

Question

这是问题,我正在寻找一种方法来获得一个月的周数.我已经找到了一个似乎适用于ios 5的解决方案,但它不在io6上(返回的数字不一样,在ios 6上还有一个).

- (int)weeksOfMonth:(int)month inYear:(int)year
{
    NSCalendar *cCalendar = [NSCalendar currentCalendar];

    NSDateComponents *components = [[NSDateComponents alloc] init];
    [components setMonth:month];
    [components setYear:year];

    NSRange range = [cCalendar rangeOfUnit:NSDayCalendarUnit
                               inUnit:NSMonthCalendarUnit
                              forDate:[cCalendar dateFromComponents:components]];

    cCalendar = [NSCalendar currentCalendar];
    [cCalendar setMinimumDaysInFirstWeek:4];

    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
    [dateFormatter setLocale: [[NSLocale alloc] initWithLocaleIdentifier:@"fr"]];
    [dateFormatter setDateFormat:@"yyyy-MM-dd"];
    NSMutableSet *weeks = [[NSMutableSet alloc] init ];

    for(int i = 0; i < range.length; i++)
    {
        NSString *temp = [NSString stringWithFormat:@"%4d-%2d-   %2d",year,month,range.location+i];
        NSDate *date = [dateFormatter dateFromString:temp ];
        int week = [[cCalendar components: NSWeekOfYearCalendarUnit fromDate:date] weekOfYear];
        [weeks addObject:[NSNumber numberWithInt:week]];
    }

    return [weeks count];
}

io6上的返回值为6,io5上的返回值为5.

你有什么主意吗 ？

编辑:另一件事,我的设备(ios5)是法语,模拟器(ios6)是英文.也许它可以改变一些东西(比如一周的第一天？)？

Answer 1

试试这个:

NSDate *date = [NSDate date];//since you are forming date, put it here
NSCalendar *calender = [NSCalendar currentCalendar];
NSRange weekRange = [calender rangeOfUnit:NSWeekCalendarUnit inUnit:NSMonthCalendarUnit forDate:date];
NSInteger weeksCount=weekRange.length;
NSLog(@"%d",weeksCount);

Swift 4.0:

let date = Date()
let calendar = Calendar.current
let weekRange = calendar.range(of: .weekOfMonth, 
                               in: .month, 
                               for: date)
let weeksCount = weekRange.count ?? 0
print(weeksCount)

或者将您的方法更改为:

- (NSInteger)weeksOfMonth:(int)month inYear:(int)year{
    NSString *dateString=[NSString stringWithFormat:@"%4d/%d/1",year,month];

    NSDateFormatter *dfMMddyyyy=[NSDateFormatter new];
    [dfMMddyyyy setDateFormat:@"yyyy/MM/dd"];
    NSDate *date=[dfMMddyyyy dateFromString:dateString];

    NSCalendar *calender = [NSCalendar currentCalendar];
    NSRange weekRange = [calender rangeOfUnit:NSWeekCalendarUnit inUnit:NSMonthCalendarUnit forDate:date];
    NSInteger weeksCount=weekRange.length;

    return weeksCount;
}

编辑:

在上面的方法中使用它

 //NSCalendar *calender = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
 [calender setFirstWeekday:2]; //sunday=1, monday=2 etc