如何从NSDate的获取小时，分钟？如何从NSDate的获取小时，分钟？(How do I get

在我的应用程序需要分别得到小时和分钟：

NSString *currentHour=[string1 substringWithRange: NSMakeRange(0,2)];
        int currentHourInNumber=[currentHour intValue];

考虑string1包含11:59:13 AM这是从日期选择器来了。

在这里，如果我用上面的代码，也没关系拿到小时，如果是大于9否则我需要改变NSMakeRange(0,1) 1之间取得小时到9。

是否有任何方法来获取小时，分钟，等？

在此先感谢，请给我提供的示例代码。

Answer 1:

使用一个NSDateFormatter转换string1成NSDate ，然后得到所需要的NSDateComponents ：

OBJ-C：

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"<your date format goes here"];
NSDate *date = [dateFormatter dateFromString:string1];
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *components = [calendar components:(NSCalendarUnitHour | NSCalendarUnitMinute) fromDate:date];
NSInteger hour = [components hour];
NSInteger minute = [components minute];

迅速1和2：

let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "Your date Format"
let date = dateFormatter.dateFromString(string1)
let calendar = NSCalendar.currentCalendar()
let comp = calendar.components([.Hour, .Minute], fromDate: date)
let hour = comp.hour
let minute = comp.minute

斯威夫特3：

let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "Your date Format"
let date = dateFormatter.date(from: string1)
let calendar = Calendar.current
let comp = calendar.dateComponents([.hour, .minute], from: date)
let hour = comp.hour
let minute = comp.minute

更多关于日期格式是在官方网站的unicode

Answer 2:

如果你只需要它表现为一个字符串下面的代码更容易

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"HH:mm"];

NSString *startTimeString = [formatter stringFromDate:startTimePicker.date];

Answer 3:

在我看来这是问题是什么之后，无需格式化：

NSDate *date = [NSDate date];
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *components = [calendar components:(NSCalendarUnitHour | NSCalendarUnitMinute) fromDate:date];
NSInteger hour = [components hour];
NSInteger minute = [components minute];

Answer 4:

NSDateComponents

所有你需要的可以在这里找到：
https://developer.apple.com/library/content/documentation/Cocoa/Conceptual/DatesAndTimes/Articles/dtCalendars.html

Answer 5:

如果你使用C库，然后可以这样做：

time_t t;
struct tm * timeinfo;

time (&t);
timeinfo = localtime (&t);

NSLog(@"Hour: %d Minutes: %d", timeinfo->tm_hour, timeinfo->tm_min);

并利用斯威夫特：

var t = time_t()
time(&t)
let x = localtime(&t)

println("Hour: \(x.memory.tm_hour) Minutes: \(x.memory.tm_min)")

为进一步指导，请参阅： http://www.cplusplus.com/reference/ctime/localtime/

Answer 6:

与iOS 8，苹果推出一个辅助方法来检索hour ， minute ， second和nanosecond从一个NSDate对象。

Objective-C的

NSDate *date = [NSDate currentDate];
NSInteger hour = 0;
NSInteger minute = 0;
NSCalendar *currentCalendar = [NSCalendar currentCalendar];
[currentCalendar getHour:&hour minute:&minute second:NULL nanosecond:NULL fromDate:date];
NSLog(@"the hour is %ld and minute is %ld", (long)hour, (long)minute);

迅速

let date = NSDate()
var hour = 0
var minute = 0
let calendar = NSCalendar.currentCalendar()
if #available(iOS 8.0, *) {
    calendar.getHour(&hour, minute: &minute, second: nil, nanosecond: nil, fromDate: date)
    print("the hour is \(hour) and minute is \(minute)")
}

Answer 7:

雨燕2.0

    let dateNow = NSDate()
    let calendar = NSCalendar.currentCalendar()
    let hour = calendar.component(NSCalendarUnit.Hour, fromDate: dateNow)
    let minute = calendar.component(NSCalendarUnit.Minute, fromDate: dateNow)
    print(String(hour))
    print(String(minute))

请注意要转换成字符串的print语句，你可以轻松地分配该值的变量，就像这样：

var hoursString = String(hour)
var minutesString = String(minute)

然后，您可以连接这样的价值观：

var compoundString = "\(hour):\(minute)"
print(compoundString)

Answer 8:

雨燕2.0

你可以做以下的事情拿到小时和分钟从日期：

let dateFromat = NSDateFormatter()
dateFromat.dateFormat = "hh:mm a"
let date = dateFromat.dateFromString(string1) // In your case its string1
print(date) // you will get - 11:59 AM

文章来源: How do I get hour and minutes from NSDate?