What does $0 mean in SwiftUI

This article mainly introduces the meaning of $0 in SwiftUI, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

$0 represents the first parameter passed to the Swift closure, which is the syntax sugar of the Swift language. Swift automatically provides shorthand parameter names for inline closures, which can be referenced by names such as $0memery "1Power2".

Code

Import UIKitlet name = [1name 23jue 8jue 6] let reverseName = name.sorted (by: {$0 > $1}) let reverseName2 = name.sorted (by: {$1 > $0}) print (name) print (reverseName) print (reverseName2)

Do not use $0 $1 instead

Let numbers = [1 numbers 2 5 print 4 3 6 8 7] sortNumbers = numbers.sorted (by: {(a, b)-> Bool in return a < b}) print ("numbers -" + "\ (sortNumbers)")

Use $0J. 1

Let numbers = [1 numbers 2 5 7] var sortNumbers = numbers.sorted (by: {$0 < $1}) print ("numbers -" + "\ (sortNumbers)")

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