iOS时间字符串格式化输出技巧详解
程序员文章站
2024-02-08 16:09:22
一.前言
最近项目开发过程中用到了大量的关于时间的处理,将后台返回的时间字符串转换为指定的格式时间再显示在ui上.
例如: 将后台返回的时间字符串2017-04-16...
一.前言
最近项目开发过程中用到了大量的关于时间的处理,将后台返回的时间字符串转换为指定的格式时间再显示在ui上.
例如: 将后台返回的时间字符串2017-04-16 13:08:06转换为:2017年04月16日、2017年04月、04月16日、2017-04-16、2017-04、04-16、13:08、星期几等等.
项目是多人开发,由于前期没有统一处理时间转换的问题,后期发现项目中好多关于时间转换的代码,大部分都是通过(- : 等字符)截取成字符串数组再取相应时间拼接成指定格式,输出在ui显示的地方,代码非常的臃肿,并且这种方式非常不可取.
原因:后台返回的时间字符串 并不都是 2017-04-16 13:08:06这种格式,还有2017-04-16这种格式,截取前需要长度格式等校验,多了很多校验代码.非常不可取.
既然是时间,我们便要通过时间的思维来完成转换问题,不要通过截取字符串的方式
于是我便写了一个类,来统一处理转换问题.
二.效果
具体怎么操作:
三.将时间字符串->nsdate
首先我们要将2017-04-16 13:08:06或2017-04-16这种格式时间字符串转换为nsdate
我们新建一个nsdate的category,笔者取名为nsdate+xhcategory,写一个时间字符串->nsdate方法,代码如下:
+(nsdate*)xh_datewithformat_yyyy_mm_dd_hh_mm_ss_string:(nsstring *)string
{
nsdateformatter* dateformat = [[nsdateformatter alloc] init];
[dateformat setdateformat:@"yyyy-mm-dd hh:mm:ss"];
nsdate *date =[dateformat datefromstring:string];
return date;
}
为了兼用其他格式时间字符串,我们把可能的情况都写上,如下
+(nsdate *)xh_datewithformat_yyyy_mm_dd_hh_mm_string:(nsstring *)string
{
nsdateformatter* dateformat = [[nsdateformatter alloc] init];
[dateformat setdateformat:@"yyyy-mm-dd hh:mm"];
nsdate *date =[dateformat datefromstring:string];
return date;
}
+(nsdate *)xh_datewithformat_yyyy_mm_dd_hh_string:(nsstring *)string
{
nsdateformatter* dateformat = [[nsdateformatter alloc] init];
[dateformat setdateformat:@"yyyy-mm-dd hh"];
nsdate *date =[dateformat datefromstring:string];
return date;
}
+(nsdate *)xh_datewithformat_yyyy_mm_dd_string:(nsstring *)string
{
nsdateformatter* dateformat = [[nsdateformatter alloc] init];
[dateformat setdateformat:@"yyyy-mm-dd"];
nsdate *date =[dateformat datefromstring:string];
return date;
}
+(nsdate *)xh_datewithformat_yyyy_mm_string:(nsstring *)string
{
nsdateformatter* dateformat = [[nsdateformatter alloc] init];
[dateformat setdateformat:@"yyyy-mm"];
nsdate *date =[dateformat datefromstring:string];
return date;
}
再写一个统一转换时间字符串为 nsdate的方法,如下:
+(nsdate *)xh_datewithdatestring:(nsstring *)datestring
{
nsdate *date = nil;
date = [self xh_datewithformat_yyyy_mm_dd_hh_mm_ss_string:datestring];
if(date) return date;
date = [self xh_datewithformat_yyyy_mm_dd_hh_mm_string:datestring];
if(date) return date;
date = [self xh_datewithformat_yyyy_mm_dd_hh_string:datestring];
if(date) return date;
date = [self xh_datewithformat_yyyy_mm_dd_string:datestring];
if(date) return date;
date = [self xh_datewithformat_yyyy_mm_string:datestring];
if(date) return date;
return nil;
}
四.将nsdate -> nsdateformatter
为什么要再转换为nsdateformatter,有些人可能已经明白了,我们点开nsdateformatter可以看到nsdateformatter有以下属性
@property (nullable, copy) nscalendar *calendar ns_available(10_7, 4_0); @property (nullable, copy) nstimezone *timezone ns_available(10_7, 4_0); @property nsinteger era; @property nsinteger year; @property nsinteger month; @property nsinteger day; @property nsinteger hour; @property nsinteger minute; @property nsinteger second; @property nsinteger nanosecond ns_available(10_7, 5_0); @property nsinteger weekday; @property nsinteger weekdayordinal; @property nsinteger quarter ns_available(10_6, 4_0); @property nsinteger weekofmonth ns_available(10_7, 5_0); @property nsinteger weekofyear ns_available(10_7, 5_0); @property nsinteger yearforweekofyear ns_available(10_7, 5_0); @property (getter=isleapmonth) bool leapmonth ns_available(10_8, 6_0); @property (nullable, readonly, copy) nsdate *date ns_available(10_7, 4_0); @end
我们新建一个nsdatecomponents 的category,笔者取名nsdatecomponents+xhcategory,并实现如下方法:
+(nsdatecomponents *)xh_datecomponentsfromdate:(nsdate *)date
{
nsdatecomponents *components = [[nscalendar currentcalendar] components:nscalendarunityear| nscalendarunitmonth | nscalendarunitday | nscalendarunitweekofyear | nscalendarunithour | nscalendarunitminute | nscalendarunitsecond | nscalendarunitweekday | nscalendarunitweekdayordinal fromdate:date];
return components;
}
接着我们就可以进行转换操作了,我们新建一个nsstring的category,笔者取名nsstring+xhdateformat
在nsstring+xhdateformat.h文件中写上需要转换的类型如下:
/** * x年x月x日 */ @property(nonatomic,copy,readonly)nsstring *xh_formatnianyueri; /** * x年x月 */ @property(nonatomic,copy,readonly)nsstring *xh_formatnianyue; /** * x月x日 */ @property(nonatomic,copy,readonly)nsstring *xh_formatyueri; /** * x年 */ @property(nonatomic,copy,readonly)nsstring *xh_formatnian; /** * x时x分x秒 */ @property(nonatomic,copy,readonly)nsstring *xh_formatshifenmiao; /** * x时x分 */ @property(nonatomic,copy,readonly)nsstring *xh_formatshifen; /** * x分x秒 */ @property(nonatomic,copy,readonly)nsstring *xh_formatfenmiao; /** * yyyy-mm-dd */ @property(nonatomic,copy,readonly)nsstring *xh_format_yyyy_mm_dd; /** * yyyy-mm */ @property(nonatomic,copy,readonly)nsstring *xh_format_yyyy_mm; /** * mm-dd */ @property(nonatomic,copy,readonly)nsstring *xh_format_mm_dd; /** * yyyy */ @property(nonatomic,copy,readonly)nsstring *xh_format_yyyy; /** * hh:mm:ss */ @property(nonatomic,copy,readonly)nsstring *xh_format_hh_mm_ss; /** * hh:mm */ @property(nonatomic,copy,readonly)nsstring *xh_format_hh_mm; /** * mm:ss */ @property(nonatomic,copy,readonly)nsstring *xh_format_mm_ss; #pragma mark - 转换为星期几 @property(nonatomic,copy,readonly)nsstring *xh_formatweekday;
在 nsstring+xhdateformat.m 实现如下:
-(nsstring *)xh_formatnianyueri
{
nsdate *date = [nsdate xh_datewithdatestring:self];
return [nsstring stringwithformat:@"%ld年%02ld月%02ld日",date.year,date.month,date.day];
}
-(nsstring *)xh_formatnianyue
{
nsdate *date = [nsdate xh_datewithdatestring:self];
return [nsstring stringwithformat:@"%ld年%02ld月",date.year,date.month];
}
-(nsstring *)xh_formatyueri
{
nsdate *date = [nsdate xh_datewithdatestring:self];
return [nsstring stringwithformat:@"%02ld月%02ld月",date.month,date.day];
}
-(nsstring *)xh_formatnian
{
nsdate *date = [nsdate xh_datewithdatestring:self];
return [nsstring stringwithformat:@"%ld年",date.year];
}
-(nsstring *)xh_formatshifenmiao
{
nsdate *date = [nsdate xh_datewithdatestring:self];
return [nsstring stringwithformat:@"%ld时%02ld分%02ld秒",date.hour,date.minute,date.seconds];
}
-(nsstring *)xh_formatshifen
{
nsdate *date = [nsdate xh_datewithdatestring:self];
return [nsstring stringwithformat:@"%ld时%02ld分",date.hour,date.minute];
}
-(nsstring *)xh_formatfenmiao
{
nsdate *date = [nsdate xh_datewithdatestring:self];
return [nsstring stringwithformat:@"%02ld分%02ld秒",date.minute,date.seconds];
}
-(nsstring *)xh_format_yyyy_mm_dd
{
nsdate *date = [nsdate xh_datewithdatestring:self];
return [nsstring stringwithformat:@"%ld-%02ld-%02ld",date.year,date.month,date.day];
}
-(nsstring *)xh_format_yyyy_mm
{
nsdate *date = [nsdate xh_datewithdatestring:self];
return [nsstring stringwithformat:@"%ld-%02ld",date.year,date.month];
}
-(nsstring *)xh_format_mm_dd
{
nsdate *date = [nsdate xh_datewithdatestring:self];
return [nsstring stringwithformat:@"%02ld-%02ld",date.month,date.day];
}
-(nsstring *)xh_format_yyyy
{
nsdate *date = [nsdate xh_datewithdatestring:self];
return [nsstring stringwithformat:@"%ld",date.year];
}
-(nsstring *)xh_format_hh_mm_ss
{
nsdate *date = [nsdate xh_datewithdatestring:self];
return [nsstring stringwithformat:@"%02ld:%02ld:%02ld",date.hour,date.minute,date.seconds];
}
-(nsstring *)xh_format_hh_mm
{
nsdate *date = [nsdate xh_datewithdatestring:self];
return [nsstring stringwithformat:@"%02ld:%02ld",date.hour,date.minute];
}
-(nsstring *)xh_format_mm_ss
{
nsdate *date = [nsdate xh_datewithdatestring:self];
return [nsstring stringwithformat:@"%02ld:%02ld",date.minute,date.seconds];
}
-(nsstring *)xh_formatweekday
{
nsstring *weekstr=nil;
nsdate *date = [nsdate xh_datewithdatestring:self];
switch (date.weekday) {
case 2:
weekstr = @"星期一";
break;
case 3:
weekstr = @"星期二";
break;
case 4:
weekstr = @"星期三";
break;
case 5:
weekstr = @"星期四";
break;
case 6:
weekstr = @"星期五";
break;
case 7:
weekstr = @"星期六";
break;
case 1:
weekstr = @"星期天";
break;
default:
break;
}
return weekstr;
}
五.调用:
self.timestring = @"2017-04-16 13:08:06"; //星期 nsstring *time0 = self.timestring.xh_formatweekday; //2017年04月16日 nsstring *time1 = self.timestring.xh_formatnianyueri; //2017年04月 nsstring *time2 = self.timestring.xh_formatnianyue; //04月16日 nsstring *time3 = self.timestring.xh_formatyueri; //2017年 nsstring *time4 = self.timestring.xh_formatnian; //13时08分01秒 nsstring *time5 = self.timestring.xh_formatshifenmiao; //13时08分 nsstring *time6 = self.timestring.xh_formatshifen; //08分01秒 nsstring *time7 = self.timestring.xh_formatfenmiao; //2017-04-16 nsstring *time8 = self.timestring.xh_format_yyyy_mm_dd; //2017-04 nsstring *time9 = self.timestring.xh_format_yyyy_mm; //04-16 nsstring *time10 = self.timestring.xh_format_mm_dd; //2017 nsstring *time11 = self.timestring.xh_format_yyyy; //13:08:06 nsstring *time12 = self.timestring.xh_format_hh_mm_ss; //13:08 nsstring *time13 = self.timestring.xh_format_hh_mm; //08:06 nsstring *time14 = self.timestring.xh_format_mm_ss;
github地址：https://github.com/coderzhuxh/xhdate
完整项目下载地址：xhdate_jb51.rar
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。