新浪微博客户端(28)-格式化日期显示

#import "DJStatus.h"
#import "MJExtension.h"
#import "DJPhoto.h"

@implementation DJStatus

+ (NSDictionary *)mj_objectClassInArray {

return @{@"pic_urls":[DJPhoto class]};

}

// 格式化返回日期
- (NSString *)created_at {

/* 将日期字符串转换为NSDate对象 */
NSDateFormatter *fmt = [[NSDateFormatter alloc] init];
fmt.locale = [[NSLocale alloc] initWithLocaleIdentifier:@"en_US"];
fmt.dateFormat = @"EEE MMM dd HH:mm:ss Z yyyy";
NSDate *createDate = [fmt dateFromString:_created_at];

NSDate *nowDate = [NSDate date];

NSCalendar *calendar = [NSCalendar currentCalendar];
NSCalendarUnit unit = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;

// 获取两个指定日期之前的差值
NSDateComponents *components = [calendar components:unit fromDate:createDate toDate:nowDate options:0];

if ([createDate isThisYear]) { // 今年
if ([createDate isYesterday]) { // 昨天
fmt.dateFormat = @"昨天 HH:mm";
return [fmt stringFromDate:createDate];
} else if ([createDate isToday]) { // 今天

if (components.hour >= 1) { // 大于1小时
return [NSString stringWithFormat:@"%zd小时前",components.hour];
} else if (components.minute >= 1) { // 1小时内
return [NSString stringWithFormat:@"%zd分钟前",components.minute];
} else { // 1分钟内
return @"刚刚";
}

} else { // 今年的其它天
fmt.dateFormat = @"MM-dd HH:mm";
return [fmt stringFromDate:createDate];
}

} else { // 非今年
fmt.dateFormat = @"yyyy-MM-dd HH:mm";
return [fmt stringFromDate:createDate];
}

return _created_at;

}

@end

#import "NSDate+Extension.h"

@implementation NSDate (Extension)

/** 判断当前日期是否是今年 */
- (BOOL)isThisYear {

NSCalendar *calendar = [NSCalendar currentCalendar];
NSCalendarUnit yearUnit = NSCalendarUnitYear;

NSDate *nowDate = [NSDate date];

NSDateComponents *createDateComponents = [calendar components:yearUnit fromDate:self];
NSDateComponents *nowDateComponents = [calendar components:yearUnit fromDate:nowDate];

return createDateComponents.year == nowDateComponents.year;

}

/** 判断当前日期是否是昨天 */
- (BOOL)isYesterday {

NSDate *nowDate = [NSDate date];
NSDateFormatter *fmt = [[NSDateFormatter alloc] init];
fmt.dateFormat = @"yyyy-MM-dd";
fmt.locale = [[NSLocale alloc] initWithLocaleIdentifier:@"en_US"];

NSString *createDateStr = [fmt stringFromDate:self];
NSString *nowDateStr = [fmt stringFromDate:nowDate];

NSCalendar *calendar = [NSCalendar currentCalendar];
NSDate *fmtCreateDate = [fmt dateFromString:createDateStr];
NSDate *fmtNowDate = [fmt dateFromString:nowDateStr];

NSCalendarUnit unit = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay;

NSDateComponents *components = [calendar components:unit fromDate:fmtCreateDate toDate:fmtNowDate options:0];

// 要求年份差值为0，月份差值为0，天数差值为1天
return (components.year == 0) && (components.month == 0) && (components.day == 1) ;

}

/** 判断当前日期是否是同一天 */
- (BOOL)isToday {
NSDate *nowDate = [NSDate date];
NSDateFormatter *fmt = [[NSDateFormatter alloc] init];
fmt.dateFormat = @"yyyy-MM-dd";
fmt.locale = [[NSLocale alloc] initWithLocaleIdentifier:@"en_US"];

NSString *createDateStr = [fmt stringFromDate:self];
NSString *nowDateStr = [fmt stringFromDate:nowDate];

return [createDateStr isEqualToString:nowDateStr];

}

@end