我如何从NSDate获得小时和分钟？

问题描述：

在我的应用程序中，我需要分别得到小时和分钟：

In my application I need to get the hour and minute separately:

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

考虑 string1 包含 11:59:13 AM 来自datepicker。

Consider string1 contains 11:59:13 AM which is coming from datepicker.

这里如果我使用上面的代码，如果它更大，可以获得一小时比其他我需要更改 NSMakeRange（0,1）以获得1到9之间的小时。

Here if I use above code, it's okay to get hour if it's greater than 9. Else I need to change NSMakeRange(0,1) to get hour between 1 to 9.

有没有办法获得小时，分钟等？

Are there any methods to get the hour, minutes, etc?

提前致谢，请提供示例代码。

Thanks in advance, please provide me sample code.

答

使用 NSDateFormatter 将 string1 转换为 NSDate ，然后获取所需的 NSDateComponents ：

Use an NSDateFormatter to convert string1 into an NSDate, then get the required 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];

Swift 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

Swift 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

关于 dateformat 在官方unicode上e

More about the dateformat is on the official unicode site

我如何从NSDate获得小时和分钟？

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