按NSString将NSMutablearray排序为日期 [英] Sorting NSMutablearray by NSString as a date

问题描述

我有一个数组，其中填充了字符串对象.在每个对象内是对象的名称和字符串，用-"分隔，例如. 对象1-26.05.2012".我想按字符串中的日期而不是名称对数组进行排序，这可能吗?

I have an array, which is filled out with string objects. Inside each object is the name of the object and the string, seperated by " - ", ex. "Object1 - 26.05.2012 ". I would like to sort my array by the date in the string, and not the name, descending Is this possible?

推荐答案

正如@Vladimir指出的那样，最好将名称和字符串彼此分开并按日期排序.

As @Vladimir pointed out, it would be much better to separate the name and the string from each other and sort by the date.

NSMutableArray *newArray = [[NSMutableArray alloc] init];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"dd.MM.yyyy"];
for (NSString *str in yourArray)
{
    NSRange rangeForDash = [str rangeOfString:@"-"];
    NSString *objectStr = [str substringToIndex:rangeForDash.location];
    NSString *dateStr = [str substringFromIndex:rangeForDash.location+1];
    NSDate *date = [formatter dateFromString:dateStr];
    NSDictionary *dic = [NSDictionary dictionaryWithObjectsAndKeys:objectStr, @"object", date, @"date", nil];
    [newArray addObject:dic];
}
NSSortDescriptor *sortDesc = [[NSSortDescriptor alloc] initWithKey:@"date" ascending:NO];
[newArray sortUsingDescriptors:[NSArray arrayWithObjects:sortDesc, nil]];
[sortDesc release];
[formatter release];

newArray将进行排序，但将具有字典对象，每个对象包含2个字符串.

newArray will be sorted but will have dictionary objects, each containing 2 strings.

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