iOS时间格式简洁展示
在这里给大家介绍一种类似微博，微信中看到的时间格式实现方式。
例如：刚刚 －几分钟前－几小时前等等。
.h
#import NSDate
@interface NSDate (Extension)
-(NSDateComponents *)dateFrom:(NSDate *)from;
-(BOOL)isThisYear;
-(BOOL)isToday;
-(BOOL)isYesterday;
@end
.m
#import "NSDate+Extension.h"
@implementation NSDate (Extension)
-(NSDateComponents *)dateFrom:(NSDate *)from{
//日历
NSCalendar *calendar = [NSCalendar currentCalendar];
NSCalendarUnit unit = NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute|NSCalendarUnitSecond;
return [calendar components:unit fromDate:from toDate:self options:0 ];
}
//判断是否为今年
-(BOOL)isThisYear{
NSCalendar * calendar = [NSCalendar currentCalendar];
NSInteger nowYear = [calendar component:NSCalendarUnitYear fromDate:[NSDate date]];
NSInteger selfYear = [calendar component:NSCalendarUnitYear fromDate:self];
return selfYear == nowYear;
}
//判读是否为今天
-(BOOL)isToday{
NSDateFormatter * formatter = [[NSDateFormatter alloc]init];
formatter.dateFormat = @"yyyy-MM-dd";
NSString * nowDate = [formatter stringFromDate:[NSDate date]];
NSString * selfDate = [formatter stringFromDate:self];
return [nowDate isEqualToString:selfDate];
}
//判断是否为昨天
-(BOOL)isYesterday{
NSDateFormatter * formatter = [[NSDateFormatter alloc]init];
formatter.dateFormat = @"yyyy-MM-dd";
NSDate * nowDate = [formatter dateFromString:[formatter stringFromDate:[NSDate date]]];
NSDate * selfdate = [formatter dateFromString:[formatter stringFromDate:self]];
NSCalendar * calendar = [NSCalendar currentCalendar];
NSDateComponents * unit = [calendar components:NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay fromDate:selfdate toDate:nowDate options:0];
return unit.year == 0 && unit.month == 0 && unit.day == 1;
}
@end
下面的实例所展现的效果：当时间为去年时,显示全部时间格式,当时间为今年时分为以下情况:
当时间为今天时，判断具体时间产生、几小时前、几分钟前、刚刚的显示格式；
当时间为昨天是，显示昨天以及时分秒；
当时间既不是今天又不是昨天时，显示除年以外的所有时间格式
-(NSString *)create_time{
NSDateFormatter * formatter = [[NSDateFormatter alloc]init];
formatter.dateFormat = @"yyyy-MM-dd HH:mm:ss";
NSDate * creat = [formatter dateFromString:_create_time];
if (creat.isThisYear) {
if (creat.isToday) {
NSDateComponents * unit = [creat dateFrom:creat];
if (unit.hour > 1) {
return [NSString stringWithFormat:@"%zd小时前",unit.hour];
}else if (unit.minute > 1){
return [NSString stringWithFormat:@"%zd分钟前",unit.minute];
}else{
return @"刚刚";
}
}else if (creat.isYesterday){
formatter.dateFormat = @"昨天HH:mm:ss";
return[formatter stringFromDate:creat];
}else{
formatter.dateFormat = @"MM-dd HH:mm:ss";
return [formatter stringFromDate:creat];
}
}
else{
return[formatter stringFromDate:creat];
}
}
