dateFromComponents 返回错误值

Question

我正在尝试设置 [NSDate date] 的月份和年份，但是函数 dateFromComponents return 的值错误，这是我的代码：

    NSCalendar *gregorianCalendar = [[NSCalendar alloc] initWithCalendarIdentifier: NSCalendarIdentifierGregorian]; // Setup an NSCalendar
NSDateComponents *components = [gregorianCalendar components: NSUIntegerMax fromDate: [NSDate date]]; // Setup NSDateComponents
[components setTimeZone:[NSTimeZone defaultTimeZone]];
[components setMonth:monthInt];
[components setYear:yearInt];

// Setup the new date
NSDate *dateToCompare = [gregorianCalendar dateFromComponents: components];

yearInt 是 2014，monthInt 是 12，但它报告的是 12-2015 而不是 2014，这是为什么？

谢谢！

Answer 1

你只需要输入你需要的位运算符，试试这个：

    NSCalendar *gregorianCalendar = [[NSCalendar alloc] initWithCalendarIdentifier: NSCalendarIdentifierGregorian]; // Setup an NSCalendar
NSDateComponents *components = [gregorianCalendar components: NSCalendarUnitDay | NSCalendarUnitMonth |  NSCalendarUnitYear |NSCalendarUnitSecond | NSCalendarUnitMinute | NSCalendarUnitHour | NSCalendarUnitTimeZone fromDate: [NSDate date]]; // Setup NSDateComponents
[components setTimeZone:[NSTimeZone defaultTimeZone]];
[components setMonth:12];
[components setYear:2014];

// Setup the new date
NSDate *dateToCompare = [gregorianCalendar dateFromComponents: components];

NSLog(@"Ver %@",dateToCompare);

NSUIntegerMax = 18446744073709551615 以位表示：1000000000000000000000000000000000000000000000000000000000000000 很多人关掉。