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:
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+(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
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+(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:
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+(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
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@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:
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+(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:
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/** * 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:
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-(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:
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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;//2017-04-16nsstring *time8 = self.timestring.xh_format_yyyy_mm_dd;//2017-04nsstring *time9 = self.timestring.xh_format_yyyy_mm;//04-16nsstring *time10 = self.timestring.xh_format_mm_dd;//2017nsstring *time11 = self.timestring.xh_format_yyyy;//13:08:06nsstring *time12 = self.timestring.xh_format_hh_mm_ss;//13:08nsstring *time13 = self.timestring.xh_format_hh_mm;//08:06nsstring *time14 = self.timestring.xh_format_mm_ss; |
github地址：https://github.com/coderzhuxh/xhdate
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服务器之家。
原文链接：http://www.jianshu.com/p/902b0c2cca17#
