Sorting NSMutableArray with objects in it

This question already has an answer here:

How do I sort an NSMutableArray with custom objects in it? 25 answers

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你必须使用一个块的sort功能：

struct Fruit {
    var title: String
    var desc: String
}

var fruits = [Fruit]()
fruits.append(Fruit(title: "a", desc: "b"))
fruits.append(Fruit(title: "c", desc: "d"))


let sorted = fruits.sort() { $0.title > $1.title }
sorted

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它应该是sortUsingDescriptors：not sortedArrayUsingDescriptors：

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