ios 怎么将yyyymmdd字符串格式转换为nstimeinterval
- (void) dateConverter{
NSString *string = @"22/04/2013 05:56";
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
// this is imporant - we set our input date format to match our input string
// if format doesn't match you'll get nil from your string, so be careful
[dateFormatter setDateFormat:@"dd/MM/yyyy hh:mm"];
NSDate *date = [[NSDate alloc] init];
// voila!
date = [dateFormatter dateFromString:string];
NSLog(@"dateFromString = %@", date);
//date to timestamp
NSTimeInterval timeInterval = [date timeIntervalSince1970];
}
如何将 NSTimeInterval 转换为 int
解决方法
直接赋值：
NSTimeInterval interval = 1002343.5432542;
NSInteger time = interval;
//time is now equal to 1002343
NSTimeInterval 是双重的所以如果你将它分配直接给 NSInteger （或 int，如果你愿意的话） 它会工作。这将切断时间精确到秒。
如果你想要舍入到最接近的秒 （而不能切断） 你可以使用圆才使分配：
NSTimeInterval interval = 1002343.5432542;
NSInteger time = round(interval);
//time is now equal to 1002344
ios怎么设置当前时间到某个时间断之间的时间差
- (int)intervalSinceNow: (NSString *) theDate
{
NSDateFormatter *date=[[NSDateFormatter alloc] init];
[date setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
NSDate *d=[date dateFromString:theDate];
NSTimeInterval late=[d timeIntervalSince1970]*1;
NSDate* dat = [NSDate dateWithTimeIntervalSinceNow:0];
NSTimeInterval now=[dat timeIntervalSince1970]*1;
NSString *timeString=@"";
NSTimeInterval cha=now-late;
if (cha/86400>1)
{
timeString = [NSString stringWithFormat:@"%f", cha/86400];
timeString = [timeString substringToIndex:timeString.length-7];
return [timeString intValue];
}
return -1;
}
上面的例子只是计算相差了几天
当然可以计算其他数值
cha/3600<1 分钟
if (cha/3600>1&&cha/86400<1) 小时
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// 获取当前日期
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NSDate *date = [NSDate date];
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04
// 打印结果： 当前时间 date = 2013-08-16 09:00:04 +0000
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NSLog(@"当前时间 date = %@",date);
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// 获取从某个日期开始往前或者往后多久的日期，此处60代表60秒，如果需要获取之前的，将60改为-60即可
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date = [[NSDate alloc] initWithTimeInterval:60 sinceDate:[NSDate date]];
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//打印结果：当前时间 往后60s的时间date = 2013-08-16 09:01:04 +0000
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NSLog(@"当前时间 往后60s的时间date = %@",date);
PS：测试时时间是下午5点，但是得到的当前时间却是上午9点，相差了8小时，是时区的问题
解决办法：
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NSTimeZone *zone = [NSTimeZone systemTimeZone];
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NSInteger interval = [zone secondsFromGMTForDate: date];
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NSDate *localDate = [date dateByAddingTimeInterval: interval];
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// 打印结果 正确当前时间 localDate = 2013-08-16 17:01:04 +0000
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NSLog(@"正确当前时间 localDate = %@",localDate);
objective-c 字符串怎么转时间
NSDate类是用来表示时间的，它有一个函数dateWithNaturalLanguageString能从字符串形式的时间生成NSDate对象，但是这个函数好像在高版本不支持了。
用法：
NSDate* myDate = [NSDate dateWithNaturalLanguageString:@“3pm December 31, 2001,”];
下面是苹果网站的内容
链接地址：https://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSDate_Class/index.html#//apple_ref/occ/clm/NSDate/dateWithNaturalLanguageString:
Creates and returns an NSDate object set to the date and time specified by a given string.
Declaration
Swift
class func dateWithNaturalLanguageString(_ string: String) -> AnyObject?
Objective-C
+ (id)dateWithNaturalLanguageString:(NSString *)string
Parameters
string
A string that contains a colloquial specification of a date, such as
“last Tuesday at dinner,” “3pm December 31, 2001,” “12/31/01,” or
“31/12/01.”
Return Value
A new NSDate object set to the current date and time specified by string.
Discussion
This method supports only a limited set of colloquial phrases,
primarily in English. It may give unexpected results, and its use is
strongly discouraged. To create a date object from a string, you should
use a date formatter object instead (see NSDateFormatter and Data Formatting Guide).
In parsing the string, this method uses the date and time preferences stored in the user’s defaults database. (See dateWithNaturalLanguageString:locale: for a list of the specific items used.)
Import Statement
import Foundation
Availability
Available in OS X v10.4 and later.
Deprecated in OS X v10.10.
objective c中如何获取当前日期和时间并将其显示在一个label中？
NSDate *date=[NSDate date];//获取当前时间
NSDateFormatter *format1=[[NSDateFormatter alloc]init];
[format1 setDateFormat:@"yyyy/MM/dd HH:mm:ss"];
NSString *str1=[format1 stringFromDate:date];
UILable *lable = [[UILable alloc]init];
lable.frame = CGRectMake(20,40,280,40);
lable.textlable.text = str1;
[self.view addSubView:lable];
