Swift 2.0: Could not find overload. Need Explanation - xcode

Question

I have the following code in my program.
var detailItem: RSSItem? {
didSet {
self.configureView()
}
}
func configureView() {
if let item: RSSItem = self.detailItem
{
if let webView = self.itemWebView
{
if let templateURL = NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("template", ofType: "html")!)?
{
if var template = NSString(contentsOfURL: templateURL, encoding: NSUTF8StringEncoding)?
{
if let title = item.title
{
template = template.stringByReplacingOccurrencesOfString("###TITLE###", withString: title)
}
if let content = item.content
{
template = template.stringByReplacingOccurrencesOfString("###CONTENT###", withString: content)
}
else if let description = item.itemDescription
{
template = template.stringByReplacingOccurrencesOfString("###CONTENT###", withString: description)
}
if let date = item.pubDate
{
var formatter = NSDateFormatter()
formatter.dateFormat = "MMM dd, yyyy"
template = template.stringByReplacingOccurrencesOfString("###DATE###", withString: formatter.stringFromDate(date))
}
if let author = item.author
{
template = template.stringByReplacingOccurrencesOfString("###AUTHOR###", withString: author)
}
webView.loadHTMLString(template, baseURL: nil)
}
}
else
{
if let content = item.content
{
webView.loadHTMLString(content, baseURL: nil)
}
else if let description = item.itemDescription
{
webView.loadHTMLString(description, baseURL: nil)
}
}
}
}
}
On the line:
if let templateURL = NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("template", ofType: "html")!)?
I get the following error:
-Could not find an overload for 'pathForResource' that accepts the supplied arguments
Can someone explain this error to me and maybe suggest a solution. I have been reading through various searches on Google but can't quite seem to get what I need.
Thanks in advance.

Answer 1

NSURL(fileURLWithPath:) is now return a NSURL so just don't use if let here.
#available(iOS 2.0, *)
init(fileURLWithPath path: String, isDirectory isDir: Bool)
init(fileURLWithPath path: String) // Better to use initFileURLWithPath:isDirectory: if you know if the path is a directory vs non-directory, as it saves an i/o.
#available(iOS 2.0, *)
class func fileURLWithPath(path: String, isDirectory isDir: Bool) -> NSURL
class func fileURLWithPath(path: String) -> NSURL // Better to use fileURLWithPath:isDirectory: if you know if the path is a directory vs non-directory, as it saves an i/o.
for the line: if var template = NSString(contentsOfURL: templateURL, encoding: NSUTF8StringEncoding)?
Its decleration is:
convenience init(contentsOfURL url: NSURL, encoding enc: UInt) throws
convenience init(contentsOfFile path: String, encoding enc: UInt) throws
So it not returns optional NSString either, so you cannot use if let again. You have to use do-try-catch here.
Apple's document about this:
https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/ErrorHandling.html#//apple_ref/doc/uid/TP40014097-CH42-ID508
Also, you should use multiple unwrapping optional:
if let x = OptionalX, y = OptionalY { ... }
Your code is a pyramid of doom :)