objective-c 日期和字符串的相互转换_字符串与日期的相互转换,objective-c-优快云博客

本文详细介绍了如何使用Objective-C中的NSDate类及其子类NSDateFormatter来解析日期字符串，并将其转换为日期对象的过程。通过提供的示例代码，读者可以学会如何根据指定的日期格式将字符串转换为日期，以及如何从日期对象中提取相应的日期字符串。

#import <Foundation/Foundation.h>

@interface NSDate (StringAndDate)

//fromatter:@"yyyy-MM-dd HH:mm" ; stringDate:@"2012-03-01 23:12"
+ (NSDate *)getDateFromString:(NSString *)stringDate withFormatter:(NSString *)formatter;
+ (NSString *)getStringFromDate:(NSDate *)date withFormatter:(NSString *)formatter;

@end

#import "NSDate+StringAndDate.h"

@implementation NSDate (StringAndDate)

+ (NSDate *)getDateFromString:(NSString *)stringDate withFormatter:(NSString *)formatter
{
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:formatter];
    NSDate *date = [dateFormatter dateFromString:stringDate];
    [dateFormatter release];
    
    return date;
}
+ (NSString *)getStringFromDate:(NSDate *)date withFormatter:(NSString *)formatter
{
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:formatter];
    NSString *dayString = [dateFormatter stringFromDate:date];
    [dateFormatter release];
    
    return dayString;
}

@end

调用方法：

    NSDate *date1 = [NSDate getDateFromString:startStopTime withFormatter:@"yyyy-MM-dd,HH:mm"];

    NSString *dayString = [NSDate getStringFromDate:day withFormatter:@"yyyy-MM-dd"];