假设我们有一个名为imageFile的自定义类，这个类包含两个属性:
class imageFile {
var fileName = String()
var fileID = Int()
}
很多都存储在一个数组中:
var images : Array = []
var aImage = imageFile()
aImage.fileName = "image1.png"
aImage.fileID = 101
images.append(aImage)
aImage = imageFile()
aImage.fileName = "image1.png"
aImage.fileID = 202
images.append(aImage)
我如何排序的图像数组由'fileID'升序或降序?
当前回答
两个选择
1)使用sortInPlace对原始数组排序
self.assignments.sortInPlace({ $0.order < $1.order })
self.printAssignments(assignments)
2)使用替代数组存储有序数组
var assignmentsO = [Assignment] ()
assignmentsO = self.assignments.sort({ $0.order < $1.order })
self.printAssignments(assignmentsO)
其他回答
两个选择
1)使用sortInPlace对原始数组排序
self.assignments.sortInPlace({ $0.order < $1.order })
self.printAssignments(assignments)
2)使用替代数组存储有序数组
var assignmentsO = [Assignment] ()
assignmentsO = self.assignments.sort({ $0.order < $1.order })
self.printAssignments(assignmentsO)
[为Swift 3更新了sort(by:)]这，利用一个尾随闭包:
images.sorted { $0.fileID < $1.fileID }
根据ASC或DESC分别使用<或>。如果你想修改图像数组，那么使用以下命令:
images.sort { $0.fileID < $1.fileID }
如果你要重复这样做，并且更喜欢定义一个函数，一种方法是:
func sorterForFileIDASC(this:imageFile, that:imageFile) -> Bool {
return this.fileID < that.fileID
}
然后用as:
images.sort(by: sorterForFileIDASC)
我是这样做的，而且很管用:
var图像=[图像文件]() 图片社。* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
在Swift 3.0中
images.sort(by: { (first: imageFile, second: imageFile) -> Bool in
first. fileID < second. fileID
})
斯威夫特3、4、5所示
struct imageFile {
var fileName = String()
var fileID = Int()
}
//append objects like this
var arrImages = [imageFile]()
arrImages.append(.init(fileName: "Hello1.png", fileID: 1))
arrImages.append(.init(fileName: "Hello3.png", fileID: 3))
arrImages.append(.init(fileName: "Hello2.png",fileID: 2))
//array sorting using below code
let sortImagesArr = arrImages.sorted(by: {$0.fileID < $1.fileID})
print(sortImagesArr)
//output
imageFile(fileName: "Hello1.png", fileID: 1),
imageFile(fileName: "Hello2.png", fileID: 2),
imageFile(fileName: "Hello3.png", fileID: 3)
