error-handling - 'String' 不符合 Swift 2.0 中的协议(protocol) 'CollectionType' 错误

Question

我刚刚下载了 XCode Beta 7 并收到错误“类型 'String' 不符合协议(protocol) 'CollectionType'”。这是我第一次尝试编码，所以我不知道如何解决这个问题。谢谢!!!

//the Pasteboard is nil if full access is not granted
            let pbWrapped: UIPasteboard? = UIPasteboard.generalPasteboard()
            if let pb = pbWrapped {
                var type = UIPasteboardTypeListImage[0] as! String
                if (count(type) > 0) && (image != nil) {
                    pb.setData(UIImagePNGRepresentation(image!)!, forPasteboardType: type)
                    var readDataWrapped: NSData? = pb.dataForPasteboardType(type)
                    if let readData = readDataWrapped {
                        var readImage = UIImage(data: readData, scale: 2)
                        print("\(image) == \(pb.image) == \(readImage)")
                    }
                }
            }

Answer 1

将其更改为:

type.characters.count

然后您的代码应为:

//the Pasteboard is nil if full access is not granted
        let pbWrapped: UIPasteboard? = UIPasteboard.generalPasteboard()
        if let pb = pbWrapped {
            var type = UIPasteboardTypeListImage[0] as! String
            if (type.characters.count > 0) && (image != nil) {
                pb.setData(UIImagePNGRepresentation(image!)!, forPasteboardType: type)
                var readDataWrapped: NSData? = pb.dataForPasteboardType(type)
                if let readData = readDataWrapped {
                    var readImage = UIImage(data: readData, scale: 2)
                    print("\(image) == \(pb.image) == \(readImage)")
                }
            }
        }