iOS-显示日期的转换,今天,昨天,前天

+ (NSString *)stringWithDate:(NSDate *)date{

// 1.获得年月日

NSCalendar *calendar = [NSCalendar currentCalendar];

NSUInteger unitFlags = NSCalendarUnitYear| NSCalendarUnitMonth | NSCalendarUnitDay |NSCalendarUnitHour |NSCalendarUnitMinute;

NSDateComponents *cmp1 = [calendar components:unitFlags fromDate:date];

NSDateComponents *cmp2 = [calendar components:unitFlags fromDate:[NSDate date]];

// 2.格式化日期

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];

if (cmp1.year == cmp2.year) {

if (cmp1.month == cmp2.month) {

NSInteger delta_day = cmp1.day - cmp2.day;

switch (delta_day) {

case :

{

formatter.dateFormat = @"今天 HH:mm";

}