How to sort an array which contains Dictionaries?

问题:

I have an array which contains dictionaries in it; so how can I sort the array according to dictionary key values?

回答1:

If every element in the array is a dictionary containing a certain key, you can sort the array using a sort descriptor. For instance, if every element is a dictionary containing a key called "name":

NSSortDescriptor *sortByName = [NSSortDescriptor sortDescriptorWithKey:@"name"
    ascending:YES];
NSArray *sortDescriptors = [NSArray arrayWithObject:sortByName];
NSArray *sortedArray = [array sortedArrayUsingDescriptors:sortDescriptors];

回答2:

The other way to achieve this would be using sortedArrayUsingComparator: method

NSArray *sortedArray = [array sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
    return [[obj1 valueForKey:@"value"] compare:[obj2 valueForKey:@"value"]];
}];

回答3:

why don't you use a sorted dictionary where the property of sorted elements comes already with the data structure?

Please do check it out here

Hope this helps.

回答4:

The above shared answer by Bavarious helped me.Just want to add one more thing.If you want to sort a mutable array use something like the below code

NSSortDescriptor *sortByName = [NSSortDescriptor sortDescriptorWithKey:@"name" ascending:YES];
NSArray *sortDescriptors = [NSArray arrayWithObject:sortByName];
NSMutableArray *sortedArray = [[NSMutableArray sortedArrayUsingDescriptors:sortDescriptors]mutableCopy];

回答5:

 let arrDescriptor = NSSortDescriptor(key: "order", ascending: true)
 let sortDescriptors: NSArray = [arrDescriptor]
 let sortedArray = instancesubArray.sortedArray(using: sortDescriptors as [AnyObject] as [AnyObject] as! [NSSortDescriptor])

 print(sortedArray)