ios 如何对 NSArray 中的数字进行排序？
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原文地址: http://stackoverflow.com/questions/11179300/
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How to sort numbers in NSArray?
提问by Josh Kahane
I can't piece together how to do this.
我不能拼凑如何做到这一点。
I fetch my array from a plist, this array is full of numbers (as set in the plist). Now al I need to do is sort them so they are descending, but I can't work it out.
我从 plist 中获取我的数组，这个数组充满了数字（在 plist 中设置）。现在我需要做的就是对它们进行排序，使它们降序，但我无法解决。
回答by Alexsander Akers
Try this code?
试试这个代码？
NSArray *array = /* loaded from file */;
array = [array sortedArrayUsingSelector: @selector(compare:)];
回答by mttrb
The following will sort the numbers in ascending order and then reverse the result to give the numbers in descending order:
以下将按升序对数字进行排序，然后反转结果以按降序给出数字：
NSArray *sorted = [[[array sortedArrayUsingSelector:@selector(compare:)] reverseObjectEnumerator] allObjects];
This previous question has some other alternatives: Sort an NSArray in Descending Order
上一个问题还有其他一些选择： 按降序对 NSArray 进行排序
回答by Ohmy
Here is one of many methods using comparison block. This code snippet is handy for any array with numbers that you want to sort. For Ascending order:
这是使用比较块的众多方法之一。此代码段对于任何包含要排序的数字的数组都很方便。对于升序：
AscendingArray = [UnsortArray sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
if ([obj1 integerValue] > [obj2 integerValue]) {
return (NSComparisonResult)NSOrderedDescending;
}
if ([obj1 integerValue] < [obj2 integerValue]) {
return (NSComparisonResult)NSOrderedAscending;
}
return (NSComparisonResult)NSOrderedSame;
}];
For Descending order:
对于降序：
DescendingArray = [UnsortArray sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
if ([obj1 integerValue] > [obj2 integerValue]) {
return (NSComparisonResult)NSOrderedAscending;
}
if ([obj1 integerValue] < [obj2 integerValue]) {
return (NSComparisonResult)NSOrderedDescending;
}
return (NSComparisonResult)NSOrderedSame;
}];
回答by Duyen Hang Kim
It work for me:
它对我有用：
NSSortDescriptor *sortIdClient =
[NSSortDescriptor sortDescriptorWithKey:@"campaignValue"
ascending:NO
comparator: ^(id obj1, id obj2){
return [obj1 compare:obj2 options:NSNumericSearch];
}];
NSArray *sortDescriptors = @[sortIdClient];
NSArray *arrTemp = [self.allCampaignsList sortedArrayUsingDescriptors:sortDescriptors];
回答by Jasim
This Will solve the problem:
这将解决问题：
NSArray *array = /* loaded from file */;
array = [array sortedArrayUsingSelector: @selector(compare:)];
