dateFromComponents返回错误的值

Question

我试图设置[NSDate date]的月份和年份，但函数dateFromComponents返回错误的值，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年，monthInt是12，但它报告的是12-2015而不是2014年，为什么会这样？

谢谢！

Answer 1

你只需要放置你需要的位运算符，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 在位表示中：100000000000000000000000000000000000000000000000000000000000000000000 关闭许多人。