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ForEach in SwiftUI
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A structure that computes views on demand from an underlying collections of identified data
一个结构，可以按需从底层已标识的数据集合中动态生成视图。
Use ForEach to provide views based on a RandomAccessCollection of some data type. Either the collection’s elements must conform to Identifiable or you need to provide an id parameter to the ForEach initializer.
RandomAccessCollection
作用：高效地通过索引访问每一个元素