iOS 根据NSDate判断周几

在日常开发中，经常会遇到根据当前时间判断几天是周几。
在网上看到一个比较好的方法，果断GET!

- (NSString*)weekdayStringFromDate:(NSDate*)inputDate {
    
    NSArray *weekdays = [NSArray arrayWithObjects: [NSNull null], @"Sunday", @"周一", @"周二", @"周三", @"周四", @"周五", @"周六", nil];
    
    NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
    
    NSTimeZone *timeZone = [[NSTimeZone alloc] initWithName:@"Asia/Shanghai"];
    
    [calendar setTimeZone: timeZone];
    
    NSCalendarUnit calendarUnit = NSCalendarUnitWeekday;
    
    NSDateComponents *theComponents = [calendar components:calendarUnit fromDate:inputDate];
    
    return [weekdays objectAtIndex:theComponents.weekday];
    
}

我只是搬运工。。。。

大神在此