iOS 9错误并正确转换为Swift 2 [英] iOS 9 errors and correct conversion to swift 2

问题描述

因此，在更新到iOS 9和Swift 2之后，我的项目中出现了很多错误，即使单击自动转换"选项后也无法解决.幸运的是，大多数都非常简单，我能够弄清楚它们，但是我还剩下三个主要的.有谁能帮助我解决这些问题?

So after updating to iOS 9 and Swift 2 I had many errors in my project that even after clicking the convert automatically option didn't get fixed. Luckily most were pretty simple and I was able to figure them out but I have three major ones left. Is anyone able to help me out with these?

非常感谢！

代码块#1

override func layoutAttributesForElementsInRect(rect: CGRect) -> [AnyObject]? {
    return attributesList
}

第1块错误

Method does not override any method from its superclass  

代码块#2

required init(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
}

第2块错误

A non-failable initializer cannot chain to failable initializer 'init(coder:)' written with 'init?'

代码块#3

 NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue()) { (response: NSURLResponse!, data: NSData!, error: NSError!) -> Void in

第3块错误

'(NSURLResponse!, NSData!, NSError!) -> Void' is not convertible to '(NSURLResponse?, NSData?, NSError?) -> Void'

现在，第三个数字是固定的(但仍然不建议使用)，我在此代码的下面看到此错误:

Now that number three is fixed (but still deprecated) I get this error underneath for this code:

代码:

var dictionary = NSJSONSerialization.JSONObjectWithData(data, options: nil, error: nil) as! NSDictionary

错误:

Extra argument 'error' in call

推荐答案

1. layoutAttributesForElementsInRect现在返回[UICollectionViewLayoutAttributes]?而不是[AnyObject]?写入:

1. layoutAttributesForElementsInRect now returns [UICollectionViewLayoutAttributes]? not [AnyObject]? write:

override func layoutAttributesForElementsInRect(rect: CGRect) -> [UICollectionViewLayoutAttributes]? {
}

Super.init现在是容易犯错的public init?(coder aDecoder: NSCoder)，这意味着它可能返回nil，所以您必须编写:

Super.init now is fallible public init?(coder aDecoder: NSCoder) it means It may return nil so you have to write:

required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
}

在这种情况下，请不要使用显式类型.只需写:

Do not use explicit types in this case. Just write:

NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue()) { (response, data, error) in

}

阅读有关错误处理的信息，因为try!可能会使您的应用程序失望:/

Read about error handling because try! can let down your app :/

try! NSJSONSerialization.JSONObjectWithData(data, options: .AllowFragments)

但 sendAsynchronousRequest在iOS 9中已弃用

这篇关于iOS 9错误并正确转换为Swift 2的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！