- 开发中直接拿来用
时间处理
服务器返回时间使用
dict[@"jDate"] = @"2015-11-23 13:34:54"
NSDateFormatter *fmt 日期格式化类
[fmt setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
相同格式的时间才可以比较
用法：重写数据模型的gett方法、当显示时就会去计算处理
时间也会动态的改变实时更新，上下滚动，重新传模型，又会调用模型的getter方法
NSCalender、能比较2个时间之间的差值
先把时间转成只有年月日
比较from和self的时间差值——>谁调用就是self
- 发帖时间，几分钟前，几小时前、昨天、几天前
@implementation MGTopic
- (NSString *)create_time
{
// 日期格式化类
NSDateFormatter *fmt = [[NSDateFormatter alloc] init];
fmt.dateFormat = @"yyyy-MM-dd HH:mm";
NSDate *create = [fmt dateFromString:_create_time];
if (create.isThisYear) { // 今年
if (create.isToday) { // 今天
// 从大时间开始判断起
NSDateComponents *cmps = [create deltaWithNow];
if (cmps.hour >= 1) { // 1小时前
return [NSString stringWithFormat:@"%zd小时前", cmps.hour];
} else if (cmps.minute >= 1) { // 1分钟前
return [NSString stringWithFormat:@"%zd分钟前", cmps.minute];
} else {
return @"刚刚";
}
} else if (create.isYesterday) { // 昨天
fmt.dateFormat = @"昨天 HH:mm:ss";
return [fmt stringFromDate:create];
} else { // 其他
fmt.dateFormat = @"MM-dd HH:mm:ss";
return [fmt stringFromDate:create];
}
} else { // 不是今年
return _create_time;
}
}
@end
- 判断日期，是否是今天、昨天、………
#import
@interface NSDate (MGExtension)
/** 是否是今天 */
- (BOOL)isToday;
/** 是否是昨天 */
- (BOOL)isYesterday;
/** 是否是今年 */
- (BOOL)isThisYear;
/** 获得与当前时间的差距 */
- (NSDateComponents *)deltaWithNow;
/** 返回只包含年月日的时间 */
- (NSDate *)dateWithYMD;
@end
@implementation NSDate (MGExtension)
/** 是否为今天，年月日一样 */
- (BOOL)isToday
{
NSCalendar *calendar = [NSCalendar currentCalendar];
int unit = NSCalendarUnitDay | NSCalendarUnitMonth | NSCalendarUnitYear;
// 1.获得当前时间的年月日
NSDateComponents *nowCmps = [calendar components:unit fromDate:[NSDate date]];
// 2.获得self的年月日
NSDateComponents *selfCmps = [calendar components:unit fromDate:self];
return
(selfCmps.year == nowCmps.year) &&
(selfCmps.month == nowCmps.month) &&
(selfCmps.day == nowCmps.day);
}
/** 是否是昨天 */
// 先把时分秒去掉，只有年月日的时间，相差多少天
- (BOOL)isYesterday
{
// 2014-12-31 和 2015-01-01只相差一天
// 2014-05-01 18:45:56
// 2014-05-01
NSDate *nowDate = [[NSDate date] dateWithYMD];
// 2014-04-30 19:23:49
// 2014-04-30
NSDate *selfDate = [self dateWithYMD];
// 只关注天数的差别 获得nowDate和selfDate的差距
NSCalendar *calender = [NSCalendar currentCalendar];
NSDateComponents *cmps = [calender components:NSCalendarUnitDay fromDate:selfDate toDate:nowDate options:0];
// 可能相差1 年，差1天—>cmps.day是366天
return cmps.day == 1;
}
/** 是否为今年 */
- (BOOL)isThisYear
{
NSCalendar *calendar = [NSCalendar currentCalendar];
int unit = NSCalendarUnitYear;
// 1.获得当前时间的年月日
NSDateComponents *nowCmps = [calendar components:unit fromDate:[NSDate date]];
// 2.获得self的年月日
NSDateComponents *selfCmps = [calendar components:unit fromDate:self];
return nowCmps.year == selfCmps.year;
}
/** 获得与当前时间的差距，谁调用谁就是self */
- (NSDateComponents *)deltaWithNow
{
// 2014-09-10 18:40:30
// 2014-09-10 19:50:50
// 1h 10m 20s
NSCalendar *calender = [NSCalendar currentCalendar];
int unit = NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;
return [calender components:unit fromDate:self toDate:[NSDate date] options:0];
}
/** 返回只包含年月日的时间 */
- (NSDate *)dateWithYMD
{
NSDateFormatter *fmt = [[NSDateFormatter alloc] init];
fmt.dateFormat = @"yyyy-MM-dd";
NSString *dateStr = [fmt stringFromDate:self];
return [fmt dateFromString:dateStr];
}
@end
用例：
// 时间戳转化为是刚刚、几分钟前、几小时前、几天前等(与当前时间相比)
+ (NSString *)currentDateWithRerence:(NSTimeInterval)timeStamp {
NSDate *confromTimesp = [NSDate dateWithTimeIntervalSince1970:timeStamp];
return [[NSDate date] prettyDateWithReference:confromTimesp];
}
// 时间转化为是刚刚、几分钟前、几小时前、几天前等(自定义时间相比)
- (NSString *)prettyDateWithReference:(NSDate *)reference {
NSString *suffix = @"前";
float different = [reference timeIntervalSinceDate:self];
if (different < 0) {
different = -different;
suffix = @"前";
}
// days = different / (24 * 60 * 60), take the floor value
float dayDifferent = floor(different / 86400);
int days = (int)dayDifferent;
int weeks = (int)ceil(dayDifferent / 7);
int months = (int)ceil(dayDifferent / 30);
int years = (int)ceil(dayDifferent / 365);
// It belongs to today
if (dayDifferent <= 0) {
// lower than 60 seconds
if (different < 60) {
return @"刚刚";
}
// lower than 120 seconds => one minute and lower than 60 seconds
if (different < 120) {
return [NSString stringWithFormat:@"1分钟%@", suffix];
}
// lower than 60 minutes
if (different < 66 * 60) {
return [NSString stringWithFormat:@"%d分钟%@", (int)floor(different / 60), suffix];
}
// lower than 60 * 2 minutes => one hour and lower than 60 minutes
if (different < 7200) {
return [NSString stringWithFormat:@"1小时%@", suffix];
}
// lower than one day
if (different < 86400) {
return [NSString stringWithFormat:@"%d小时%@", (int)floor(different / 3600), suffix];
}
}
// lower than one week
else if (days < 7) {
return [NSString stringWithFormat:@"%d天%@%@", days, days == 1 ? @"" : @"", suffix];
}
// lager than one week but lower than a month
else if (weeks < 4) {
return [NSString stringWithFormat:@"%d周%@%@", weeks, weeks == 1 ? @"" : @"", suffix];
}
// lager than a month and lower than a year
else if (months < 12) {
return [NSString stringWithFormat:@"%d月%@%@", months, months == 1 ? @"" : @"", suffix];
}
// lager than a year
else {
return [NSString stringWithFormat:@"%d年%@%@", years, years == 1 ? @"" : @"", suffix];
}
return self.description;
}
// 时间戳转化为当前时间
+ (NSString *)timeIntervalToNSDate:(NSTimeInterval)time {
//因为时差问题要加8小时 == 28800 sec
NSDate *detaildate=[NSDate dateWithTimeIntervalSince1970:(time)];
//实例化一个NSDateFormatter对象
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
//设定时间格式,这里可以设置成自己需要的格式
[dateFormatter setDateFormat:@"yyyy-MM-dd"];
NSString *currentDateStr = [dateFormatter stringFromDate: detaildate];
return currentDateStr;
}
- 两日期之间相差几天
- (NSInteger)getDifferenceByDate:(NSString *)date {
//获得当前时间
NSDate *now = [NSDate date];
//实例化一个NSDateFormatter对象
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
//设定时间格式
[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
NSDate *oldDate = [dateFormatter dateFromString:date];
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
unsigned int unitFlags = NSDayCalendarUnit;
NSDateComponents *comps = [gregorian components:unitFlags fromDate:oldDate toDate:now options:0];
return [comps day];
}
金额处理
数字大到一定程度，显示具体的无意义，要抽象化、如12万、4.3万
数字为0时，显示中文。
- (void)setButtonTitle:(UIButton *)button count:(NSInteger)count placeholder:(NSString *)placeholder
{
// 利用placeholder不用新开变量
if (count > 10000) {
placeholder = [NSString stringWithFormat:@"%.1f万", count / 10000.0];
} else if (count > 0) {
placeholder = [NSString stringWithFormat:@"%zd", count];
}
[button setTitle:placeholder forState:UIControlStateNormal];
}