我有一个 NSArray,它包含这样的自定义对象:
NSArray *array = {
students,students
}
Student 对象依次存储如下值:
student.name,
student.class,
student.admissionDate
student.school ..etc
现在我想要一个 NSArray
,其中包含所有根据 admissionDate
排序的学生详细信息。
我尝试使用 NSSortDecriptor
但它对我没有帮助。
编辑
经过一番努力,我成功地形成了一个 NSDictionary 的 NSMutable 数组,它看起来像:
for(Student *arr in array)
{
NSMutableDictionary *dict;
dict = [[NSMutableDictionary alloc]init];
[dict setObject:arr.stuName forKey:@"name"];
[dict setObject:arr.stuAdate forKey:@"date"];
[dict setObject:arr.stuClass forKey:@"class"];
[expenseArray addObject:dict];
}
Printing description of expenseArray:
<__NSArrayM 0x7fe703833f70>(
{
name = uuu;
Adate = "2015-10-10 10:56:03 +0000";
class = 1st;
},
{
name = abc;
Adate = "2015-10-07 11:10:00 +0000";
class = 3rd;
},
{
name = btw;
Adate = "2015-10-10 11:13:47 +0000";
class = 4th;
}
)
现在我如何根据日期排序
最佳答案
排序描述符应该适合你
NSSortDescriptor *sortDescriptor = [NSSortDescriptor sortDescriptorWithKey:@"admissionDate" ascending:YES];
NSArray *sortedStudents = [studentArray sortedArrayUsingDescriptors:@[sortDescriptor]];
下面是工作示例
NSMutableArray *studentArray = [NSMutableArray new];
for (int i = 0; i < 8; i++) {
Student *student = [Student new];
unsigned int randomInterval = arc4random();
student.admissionDate = [NSDate dateWithTimeIntervalSinceNow:randomInterval];
[studentArray addObject:student];
}
for (Student *student in studentArray) {
NSLog(@"%@", student.admissionDate);
}
NSSortDescriptor *sortDescriptor = [NSSortDescriptor sortDescriptorWithKey:@"admissionDate" ascending:YES];
NSArray *sortedStudents = [studentArray sortedArrayUsingDescriptors:@[sortDescriptor]];
NSLog(@"\n\n * * * * * After Sorting * * * * * *\n\n");
for (Student *student in sortedStudents) {
NSLog(@"%@", student.admissionDate);
}
日志
2024-02-11 23:47:47 +0000
2093-11-13 21:49:48 +0000
2042-04-06 23:53:28 +0000
2032-12-23 01:49:46 +0000
2102-12-28 23:08:06 +0000
2058-10-17 14:14:27 +0000
2142-02-01 07:19:34 +0000
2048-05-14 07:07:04 +0000
* * * * * After Sorting * * * * * *
2024-02-11 23:47:47 +0000
2032-12-23 01:49:46 +0000
2042-04-06 23:53:28 +0000
2048-05-14 07:07:04 +0000
2058-10-17 14:14:27 +0000
2093-11-13 21:49:48 +0000
2102-12-28 23:08:06 +0000
2142-02-01 07:19:34 +0000
关于ios - 如何对包含日期对象的自定义数组进行排序,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/33053471/