使用NSDateComponents获取当前日期时获取错误

Question

我正在尝试使用NSDateComponents获取当前日期。 （然后我将改变周，月等。）这是代码：

NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *components = [calendar component:(NSCalendarUnitCalendar |
                                                        NSCalendarUnitYear |
                                                        NSCalendarUnitMonth |
                                                        NSCalendarUnitDay) fromDate:[NSDate date]];

Xcode给了我以下警告：

Incompatible integer to pointer conversion initializing 'NSDateComponents *__string' with an expression of type...'

错误：

Implicit conversion of 'NSInteger' (aka 'long') to 'NSDateComponents *' is disallowed with ARC

Answer 1

NSDateComponents *components = [[NSCalendar currentCalendar] components:NSWeekdayCalendarUnit fromDate:[NSDate date]];

使用component添加您要访问的1个单元。 将components用于多个单元。