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:

? 1 2 3 4 5 6 7 +(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

? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 +(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:

? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 +(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

? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 @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:

? 1 2 3 4 5 6 +(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:

? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 /** * 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:

? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 -(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:

? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 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

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#