在 nmutablearray 中单独的未来日期 [英] separate future date in nsmutablearray

问题描述

我在该数组中有一个可变数组，我只有过去的日期、当前日期和未来日期.我必须分开未来的日期 &存储到另一个数组中.你能帮我吗.

I am having a mutable array in that array i am having only past date, current date & future date. I have to separate the future date & store into another array. Can you help me.

这是我的数组:

uniqueItems(
    "2015-03-01",
    "2015-02-28",
    "2015-02-22",
    "2015-02-21",
    "2015-02-20",
    "2015-02-15",
    "2015-02-14",
    "2015-02-13",
    "2015-02-08",
    "2015-02-07",
    "2015-02-01",
    "2015-01-31",
    "2015-01-30",
    "2015-01-25",
    "2015-01-24",
    "2015-01-18",
    "2015-01-17",
    "2015-01-16",
    "2015-01-11",
    "2015-01-10",
    "2014-12-07"

我已经尝试过这种编码，但不起作用.

I have tried this coding, but is not working.

NSDate *currentDate = [NSDate date];
 NSDate* dateAdded=(NSDate*)[uniqueItems objectAtIndex:0];
 double min = [currentDate timeIntervalSinceDate:dateAdded];
int minIndex = 0;
 for (int i = 1; i < [uniqueItems count]; ++i)
{

    double currentmin = [currentDate timeIntervalSinceDate:[uniqueItems objectAtIndex:i]];
    if (currentmin < min) {
        min = currentmin;
        minIndex = i;}}

推荐答案

你可以使用 NSPredicate 块.您的数组不包含 NSDate 对象，因此我们需要将其转换为 NSDate 然后与 [NSDate date]

you can use NSPredicate block for that. your array does not contain NSDate objects so we need to convert it into NSDate and then compare with [NSDate date]

NSPredicate *findFutureDates = [NSPredicate predicateWithBlock: ^BOOL(id obj, NSDictionary *bind){
    NSDateFormatter *df = [[NSDateFormatter alloc]init];
    [df setDateFormat:@"yyyy-MM-dd"];
    [df setTimeZone:[NSTimeZone systemTimeZone]];
    NSDate *dd = [df dateFromString:(NSString *)obj ];
    return ([[NSDate date] compare:dd] == NSOrderedAscending);
}];

NSArray *arrFutureDates = [yourArray filteredArrayUsingPredicate: findFutureDates];
NSLog(@"%@",arrFutureDates);

如果你通过了 NSOrderedAscending 会给你未来的日期如果你通过 NSOrderedDescending 会给你过去的日期.

if you pass NSOrderedAscending will give you future dates if you pass NSOrderedDescending will give you past dates.

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