[英]Sorting NSArray which contain array of dictionaries - Sort as per “Date” key
[英]Sorting NSArray of dictionaries by value of a key in the dictionaries
我有一个由字典填充的数组,我需要按字典中的一个键的值按字母顺序对数组进行排序。
这是我的阵列:
tu dictus: (
{
brand = Ryul;
productTitle = Any;
quantity = 1;
subBrand = "Ryul INJ";
type = Product;
},
{
brand = Trol;
productTitle = Different;
quantity = 2;
subBrand = "";
type = Brand;
},
{
brand = Dtor;
productTitle = Any;
quantity = 1;
subBrand = "";
type = Product;
},
{
brand = Ryul;
productTitle = Different;
quantity = 2;
subBrand = "Ryul CHES";
type = SubBrand;
},
{
brand = Anan;
productTitle = Any;
quantity = 1;
subBrand = "";
type = Product;
}
)
通常用于排序我将使用的数组
myArray = [uniqueProdsArray sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)];
但如何使用字典的brand
键进行排序?
我想这会做到:
brandDescriptor = [[NSSortDescriptor alloc] initWithKey:@"brand" ascending:YES];
sortDescriptors = [NSArray arrayWithObject:brandDescriptor];
sortedArray = [myArray sortedArrayUsingDescriptors:sortDescriptors];
我从Sort Descriptor Programming Topics中提取代码。 此外, 键值编码开始发挥作用, sortedArrayUsingDescriptors:
将向myArray
每个元素发送一个valueForKey:
sortedArrayUsingDescriptors:
然后使用标准比较器对返回的值进行排序。
我们通过使用方法得到了解决方案
[self.jsonData sortUsingDescriptors: [NSArray arrayWithObjects: [NSSortDescriptor sortDescriptorWithKey:"fullname" ascending:YES], [NSSortDescriptor sortDescriptorWithKey:"id" ascending:NO], nil]];
哪里:-
jsonData
- 包含解析的JSON数据的MutableArray。
fullname
- 我们要排序的数据。
id
- 内部字典附带的唯一数据。
arrSorted = [arrBrand sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
if ([[obj1 valueForKey:@"iUserId"] integerValue] > [[obj2 valueForKey:@"iUserId"] integerValue]) {
return (NSComparisonResult)NSOrderedDescending;
}
if ([[obj1 valueForKey:@"iUserId"] integerValue] < [[obj2 valueForKey:@"iUserId"] integerValue]) {
return (NSComparisonResult)NSOrderedAscending;
}
return (NSComparisonResult)NSOrderedSame;
}];
在switf中:
var descriptor: NSSortDescriptor = NSSortDescriptor(key: "brand", ascending: true)
var sortedResults: NSArray = results.sortedArrayUsingDescriptors([descriptor])
使用以下代码使用字典中的“品牌”键进行排序。
NSSortDescriptor * brandDescriptor = [[NSSortDescriptor alloc] initWithKey:@"brand" ascending:YES];
NSArray * sortDescriptors = [NSArray arrayWithObject:brandDescriptor];
NSArray * sortedArray = [myArray sortedArrayUsingDescriptors:sortDescriptors];
NSLog(@"sortedArray %@",sortedArray);
使用以下代码,如果要根据字典中的两个键进行排序; 比如,“品牌”键和productTitle键来自字典: -
NSSortDescriptor * brandDescriptor = [[NSSortDescriptor alloc] initWithKey:@"brand" ascending:YES];
NSSortDescriptor * productTitleDescriptor = [[NSSortDescriptor alloc] initWithKey:@"productTitle" ascending:YES];
NSArray * sortDescriptors = [NSArray arrayWithObjects:brandDescriptor, productTitleDescriptor, nil];
NSArray * sortedArray = [feedData sortedArrayUsingDescriptors:sortDescriptors];
NSLog(@"sortedArray %@",sortedArray);
作为QED代码的补充,
NSSortDescriptor * brandDescriptor = [[NSSortDescriptor alloc] initWithKey:@"brand" ascending:YES];
NSArray * sortedArray = [myArray sortedArrayUsingDescriptors:@[brandDescriptor]];
这澄清了变量的类,并使用快速枚举优化了数组创建。 谢谢
当我使用NSSortDescriptor
时,我的代码崩溃了,所以最终使用了一个在我的用例中运行良好的块,我希望“rank”是一个NSNumber。 如果对象无法转换为整数,则不会对其进行排序,但也不会导致崩溃。
NSArray *sortedArray = [data sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
long data1 = [[obj1 valueForKey:@"rank"] integerValue];
long data2 = [[obj2 valueForKey:@"rank"] integerValue];
if (data1 > data2) {
return (NSComparisonResult)NSOrderedDescending;
}
if (data1 < data2) {
return (NSComparisonResult)NSOrderedAscending;
}
return (NSComparisonResult)NSOrderedSame;
}];
试试最简单的方法......
myArray = [[NSMutableArray alloc] init];
NSMutableArray *tempArray = [[NSMutableArray alloc] init];
[tempArray removeAllObjects];
[tempArray addObjectsFromArray: myArray];
NSString *key = @"brand";
NSSortDescriptor *brandDescriptor = [[NSSortDescriptor alloc] initWithKey:key ascending:YES];
NSArray *sortDescriptors = [NSArray arrayWithObjects:brandDescriptor,nil];
NSArray *sortedArray = [tempArray sortedArrayUsingDescriptors:sortDescriptors];
[brandDescriptor release];
[tempArray removeAllObjects];
tempArray = (NSMutableArray*)sortedArray;
[myArray removeAllObjects];
[myArray addObjectsFromArray:tempArray];
你可以这样做 。
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"d LLLL yyyy"];
NSComparator compareDates = ^(id string1, id string2)
{
NSDate *date1 = [formatter dateFromString:string1];
NSDate *date2 = [formatter dateFromString:string2];
return [date1 compare:date2];
};
NSSortDescriptor * sortDesc1 = [[NSSortDescriptor alloc] initWithKey:@"date" ascending:NO comparator:compareDates];
[array sortUsingDescriptors:[NSArray arrayWithObjects:sortDesc1, nil]];
NSSortDescriptor *brandDescriptor = [[[NSSortDescriptor alloc] initWithKey:@"Position" ascending:YES selector:@selector(localizedStandardCompare:)] autorelease];
NSArray *sortDescriptors = [NSArray arrayWithObject:brandDescriptor];
NSArray *sortedArray = [arrTemp sortedArrayUsingDescriptors:sortDescriptors];
array_PreLagData=(NSMutableArray*)sortedArray;
unsorted array
Printing description of arrTemp:
<__NSArrayM 0x10282100>(
{
Milker2 = "11:03:17 AM";
Position = 2;
},
{
Milker1 = "11:03:28 AM";
Position = 25;
},
{
Milker3 = "11:03:18 AM";
Position = 3;
},
{
Milker1 = "11:03:16 AM";
Position = 1;
Strip = "11:32:32 AM";
},
{
Milker1 = "11:03:21 AM";
Position = 10;
}
)
Sorted array
<__NSArrayI 0x101363c0>(
{
Milker1 = "11:03:16 AM";
Position = 1;
Strip = "11:32:32 AM";
},
{
Milker2 = "11:03:17 AM";
Position = 2;
},
{
Milker3 = "11:03:18 AM";
Position = 3;
},
{
Milker1 = "11:03:21 AM";
Position = 10;
},
{
Milker1 = "11:03:28 AM";
Position = 25;
}
)
[enter link description here][1]
[1]: https://developer.apple.com/library/ios/documentation/Cocoa/Conceptual/SortDescriptors/Articles/Creating.html#//apple_ref/doc/uid/20001845-BAJEAIEE
用于swift 4
let sortedArray = arrayTobeSort.sorted {$0["keyName"].compare($1["keyName"]) == ComparisonResult.orderedAscending}
您还可以使用ComparisonResult.orderedDescending按降序排序
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