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【已解决】swift 3警告:C-style for statement is deprecated and will be removed in a future version of Swift

Swift crifan 1218浏览 0评论

代码:

        for var curIdx = self.groupTopicItemList.count 1; curIdx >= 0 ; curIdx -= 1 {

swift 3中出现警告:

 C-style for statement is deprecated and will be removed in a future version of Swift

ios – #warning: C-style for statement is deprecated and will be removed in a future version of Swift – Stack Overflow

xcode – C-style for statement is deprecated and will be removed in a future version of Swift – Stack Overflow

ios – C-style for statement is deprecated and will be removed in a future – Stack Overflow

swift/diag_c_style_for.swift at master · apple/swift

[swift-users] WARNING: Title underline too short

What’s new in Swift 2.2: learn all the changes in one video – Hacking with Swift

测试代码:

//: Playground – noun: a place where people can play
import UIKit
print("we want got: 9 to 0")
let totalCount = 10
let totalIndx = totalCount 1
print("C style version:")
//C-style for statement is deprecated and will be removed in a future version of Swift
for var curIdx = totalIndx; curIdx >= 0 ; curIdx -= 1 {
    print("[\(curIdx)]")
}
print("stride to version:")
//for curIdx in totalCount.stride(to: 0, by: -1){
for curIdx in totalIndx.stride(to: –1, by: –1){
    print("[\(curIdx)]")
}
print("stride througn version:")
for curIdx in totalIndx.stride(through: 0, by: –1) {
    print("[\(curIdx)]")
}
//print("count down version:")
//for curIdx in totalCount…1 {
//    print("[\(curIdx)]")
//}
//fatal error: Can’t form Range with end < start
print("reverse version:")
for curIdx in (0totalIndx).reverse() {
    print("[\(curIdx)]")
}

输出效果:

we want got: 9 to 0
C style version:
[9]
[8]
[7]
[6]
[5]
[4]
[3]
[2]
[1]
[0]
stride to version:
[9]
[8]
[7]
[6]
[5]
[4]
[3]
[2]
[1]
[0]
stride througn version:
[9]
[8]
[7]
[6]
[5]
[4]
[3]
[2]
[1]
[0]
reverse version:
[9]
[8]
[7]
[6]
[5]
[4]
[3]
[2]
[1]
[0]

最后代码改为:

        //for var curIdx = self.groupTopicItemList.count – 1; curIdx >= 0 ; curIdx -= 1 {
        for curIdx in (0…(self.groupTopicItemList.count 1)).reverse() {
//        for var i = 0; i < SecTrustGetCertificateCount(trust); i += 1 {
        for i in 0…(SecTrustGetCertificateCount(trust) – 1) {
//            for var sectionIdx = contactSectionItemList.count – 1; sectionIdx >= 0 ; sectionIdx -= 1 {
            for sectionIdx in (0…(contactSectionItemList.count 1)).reverse() {
//                    for var contactIdxInSection = contactSectionItemList[sectionIdx].contactItemList.count – 1; contactIdxInSection >= 0 ; contactIdxInSection -= 1 {
                    for contactIdxInSection in (0…(contactSectionItemList[sectionIdx].contactItemList.count 1)).reverse(){

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