从数组中获取最后10个元素:NSMakeRange

Question

我需要获得最后10个元素或10分钟和array.count.在Objective-C中,我这样做了:

Objective-C代码:

NSRange endRange = NSMakeRange(sortedArray.count >= 10 ? sortedArray.count - 10 : 0, MIN(sortedArray.count, 10));
NSArray *lastElements= [sortedArray subarrayWithRange:endRange];

在Swift中我做到了:

let endRange = NSMakeRange(values.count >= 10 ? values.count - 10 : 0, min(values.count , 10) )

但是不知道如何在swift中使用这个范围来获取数组.任何帮助,将不胜感激.谢谢.

Answer 1

您可以使用Array Instance Method suffix(_:).请注意,使用后缀不需要检查数组计数.从数组末尾开始最多需要10个元素.

let array = Array(1...100)   // [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100]

let lastTenElements = Array(array.suffix(10))   // [91, 92, 93, 94, 95, 96, 97, 98, 99, 100]