获取任意两个日期点之间的具体日期

因为遇到了这么个需求:

比如还款时间是:2017-12-06 到 2017-12-31, 然后页面需要显示pickerView, 里面的选项只能显示这些日期,因为网上有很多自定义pickView的demo,我就不重复了, 就直接说一下怎么获取这两个时间点之间的具体日期吧~

NSString *startStr = @"20171206";

NSString *endStr = @"20171231";

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

[formatterOld setDateFormat:@"yyyyMMdd"];

NSDate *startDate = [formatterOld dateFromString:startStr];

NSDate *endDate = [formatterOld dateFromString:endStr];

long long nowTime = [startDate timeIntervalSince1970], 

endTime = [endDate timeIntervalSince1970],

dayTime = 24*60*60,

time = nowTime - nowTime % dayTime;

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

[formatter setDateFormat:@"yyyyMMdd"];

while (time <= endTime) {

time += dayTime;

//!!!! dateWithTimeIntervalSince1970

NSString *string = [formatter stringFromDate:[NSDate dateWithTimeIntervalSince1970:time]];

NSLog(@"string = %@", string);

以上,没有什么逻辑需要过多解释的内容,就是那个方法不太好找,所以分享一下,大家可以试一下其他时间,如果发现bug,欢迎一起讨论