使用两个NSDates计算人的年龄 [英] Calculating the age of a person using two NSDates

问题描述

代表某人的班级有一种方法来计算该人的年龄：

My class representing a person has a method to calculate that person's age:

@interface Student : NSObject

@property (strong) NSDate *dob;

// This method will work out the person's age in calendar years
- (NSDateComponents*)ageCalculation:(NSDate*)dob;

这是类实现文件

@implementation Student

- (NSDateComponents*)ageCalculation:(NSDate*)dob {
    NSDate *now = [NSDate date];
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSCalendarUnit units = NSYearCalendarUnit | NSMonthCalendarUnit;
    NSDateComponents *components = [calendar components:units 
                                               fromDate:dob 
                                                 toDate:now   
                                                options:0];
    return components;
}

@end

我不确定我正在这样做：

I'm not sure that I'm doing this right, though:

Student *student1 = [[Student alloc] init];
[student1 setDob:aDateOfBirth];
NSDateComponents *ageComponents = [student1 ageCalculation:aDateOfBirth];

我该如何处理这个方法的结果？如何使 ageCalculation：使用我已经设置的日期？

What should I do with the result of this method? How can I make ageCalculation: use the date I already set?

推荐答案

有几件事情可以注意到。首先，计算年龄的代码很好，除了我不明白为什么你返回 NSDateComponents 而不是年龄。

There are a couple of things that can be noted. First of all, the code for computing the age is fine, except that I don't understand why you return NSDateComponents instead of just the age in years.

以下是我的操作方法

- (NSInteger)age {
    NSDate *today = [NSDate date];
    NSDateComponents *ageComponents = [[NSCalendar currentCalendar]
                                       components:NSYearCalendarUnit
                                       fromDate:self.dob
                                       toDate:today
                                       options:0];
    return ageComponents.year;
}

您只对年组件，因此返回它而不是 NSDateComponents 。使用 self.dob 而不是参数获取您之前设置的日期。

You are interested only in the year component, so return it instead of NSDateComponents. Using self.dob instead of an argument gets the date you set earlier.

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