Xcode 使用NSDate和NSDate组件计算两个日期之间的时间（未来最多6天23小时59分钟59秒）

更新：这是一个工作示例

首先，我们创建一个类来保存工作日、小时、分钟和秒：

myClass.h

#import <Foundation/Foundation.h>
#import <MapKit/MapKit.h>

@interface myClass : NSObject {
NSString *weekday;
NSInteger hour;
NSInteger minute;
NSInteger second;
}

@property (nonatomic, strong) NSString *weekday;
@property (nonatomic, assign) NSInteger hour;
@property (nonatomic, assign) NSInteger minute;
@property (nonatomic, assign) NSInteger second;

@end

接下来，我们需要创建一个保存日期信息的myClass实例

将其添加到ViewController.h：

@property (nonatomic, strong) NSMutableArray *myArray;

此代码将放在ViewController.m中的任意位置：

myArray = [[NSMutableArray alloc] init];

//Setup an instance of myClass 
myClass *c = [[myClass alloc] init];
[c setWeekday:@"Monday"];
[c setHour:13];
[c setMinute:0];
[c setSecond:0];

[myArray addObject:c];

接下来，我们需要弄清楚我们的活动还有多远。多亏了rdelmar，我们有了这样做的代码，他的答案如下

//Create a func that returns an NSDate. It requires that the Weekday, HR, Min and Secs are passed into it.
-(NSDate *)getNextDateOn:(NSString *)weekday atHour:(NSInteger)hour minute:(NSInteger)mins second:(NSInteger)secs {

//Setup an array of weekdays to compare to the imported (NSString *)weekday 
NSArray *array = [NSArray arrayWithObjects:@"Sunday",@"Monday",@"Tuesday",@"Wednesday",@"Thursday",@"Friday",@"Saturday",nil];
NSInteger weekdayNumber = [array indexOfObject:[weekday capitalizedString]] + 1;

//This code finds how many days in the future the imported (NSString *)weekday is
NSDate *now = [NSDate date];
NSCalendar *cal = [NSCalendar autoupdatingCurrentCalendar];
NSDateComponents *nowComps = [cal components:NSWeekdayCalendarUnit|NSHourCalendarUnit|NSMinuteCalendarUnit|NSSecondCalendarUnit fromDate:now];
NSInteger daysForward = (weekdayNumber - nowComps.weekday + 7) % 7;

//Lastly, create an NSDate called eventDate that consists of the 
NSDateComponents *eventComps = [[NSDateComponents alloc] init];
[eventComps setDay:daysForward];
[eventComps setHour: hour - nowComps.hour];
[eventComps setMinute: mins - nowComps.minute];
[eventComps setSecond: secs - nowComps.second];
eventDate = [cal dateByAddingComponents:eventComps toDate:now  options:0];

return eventDate;
}

在这里，我们获取新创建的eventDate并使用它在iCal中创建我们的事件：

        EKEventStore *eventStore = [[EKEventStore alloc] init];

        EKEvent *event  = [EKEvent eventWithEventStore:eventStore];
        event.title     = @"Move your car!";
        event.startDate = eventDate;
        event.endDate   = [[NSDate alloc] initWithTimeInterval:60.0f * 60.0f sinceDate:event.startDate]; //1 hr long
        [event addAlarm:[EKAlarm alarmWithRelativeOffset:60.0f * -30.0f]]; //30 min before
        //eventLoc was created using CLGeocoder and the method reverseGeocodeLocation:
        //The location is not necessary to create an event but if you'd like the code, ask and i'll post it.
        [event setLocation:eventLoc];
        [event setNotes:@"This event was set by me. ;P"];
        [event setCalendar:[eventStore defaultCalendarForNewEvents]];
        NSError *err;
        [eventStore saveEvent:event span:EKSpanThisEvent error:&err]; 
        NSLog(@"Event Set");

我希望这能像帮助我一样帮助别人

：更新结束：

我已经阅读了NSDate的文档，希望找到一种简单的方法来查找“下一个即将到来的周一下午1:00”

例如，假设面包店每周1天（星期四）从上午9点到下午6点营业。。。如果现在是星期四上午8点，我想从现在开始获得1小时的NSDate。如果今天是星期四晚上7点，我希望下个星期四的日期是上午9点

我计划在iCal中制作一个事件（测试已经成功），但问题在于计算事件时间

你能给我指出一个关于NSDate的好解释，或者帮我弄清楚如何计算我要找的NSDate吗

我希望修复此代码：

    EKEventStore *eventStore = [[EKEventStore alloc] init];

    EKEvent *event  = [EKEvent eventWithEventStore:eventStore];
    event.title     = @"Bakery's Open!";

    event.startDate = [[NSDate alloc] init];
    event.endDate   = [[NSDate alloc] initWithTimeInterval:600 sinceDate:event.startDate];

    [event setCalendar:[eventStore defaultCalendarForNewEvents]];
    NSError *err;
    [eventStore saveEvent:event span:EKSpanThisEvent error:&err]; 

---

要查找这样的日期，需要使用NSDateComponents和NSCalendar。我认为主要的任务是计算出你的目标日期是多少天。为此，您需要获取当前日期的工作日日期组件，并计算您要查找的工作日的天数。我认为以下代码应该可以让您接近：

-(NSDate *)getNextDateOn:(NSString *)weekday atHour:(NSInteger)hour minute:(NSInteger)mins second:(NSInteger)secs {
NSArray *array = [NSArray arrayWithObjects:@"Sunday",@"Monday",@"Tuesday",@"Wednesday",@"Thursday",@"Friday",@"Saturday",nil];
NSInteger weekdayNumber = [array indexOfObject:[weekday capitalizedString]] + 1;
NSDate *now = [NSDate date];
NSCalendar *cal = [NSCalendar autoupdatingCurrentCalendar];
NSDateComponents *nowComps = [cal components:NSWeekdayCalendarUnit|NSHourCalendarUnit|NSMinuteCalendarUnit|NSSecondCalendarUnit fromDate:now];
NSInteger daysForward = (weekdayNumber - nowComps.weekday + 7) % 7;

NSDateComponents *eventComps = [[NSDateComponents alloc] init];
[eventComps setDay:daysForward];
[eventComps setHour: hour - nowComps.hour];
[eventComps setMinute: mins - nowComps.minute];
[eventComps setSecond: secs - nowComps.second];
NSDate *eventDate = [cal dateByAddingComponents:eventComps toDate:now  options:0];
[eventComps release];
return eventDate;

---

}

干得好，这很管用！我很快会把这个工作示例贴在上面。

-(NSDate *)getNextDateOn:(NSString *)weekday atHour:(NSInteger)hour minute:(NSInteger)mins second:(NSInteger)secs {
NSArray *array = [NSArray arrayWithObjects:@"Sunday",@"Monday",@"Tuesday",@"Wednesday",@"Thursday",@"Friday",@"Saturday",nil];
NSInteger weekdayNumber = [array indexOfObject:[weekday capitalizedString]] + 1;
NSDate *now = [NSDate date];
NSCalendar *cal = [NSCalendar autoupdatingCurrentCalendar];
NSDateComponents *nowComps = [cal components:NSWeekdayCalendarUnit|NSHourCalendarUnit|NSMinuteCalendarUnit|NSSecondCalendarUnit fromDate:now];
NSInteger daysForward = (weekdayNumber - nowComps.weekday + 7) % 7;

NSDateComponents *eventComps = [[NSDateComponents alloc] init];
[eventComps setDay:daysForward];
[eventComps setHour: hour - nowComps.hour];
[eventComps setMinute: mins - nowComps.minute];
[eventComps setSecond: secs - nowComps.second];
NSDate *eventDate = [cal dateByAddingComponents:eventComps toDate:now  options:0];
[eventComps release];
return eventDate;