CODEWITHSUNDEEP
xcodeswiftparse-platformswift2xcode7
Suprem Vanam
Suprem Vanam

Reputation: 157

Downcast from UITabBarItem? to UITabBarItem only unwraps optionals; did you mean to use '!' Error

My code was working well in Xcode6. But, after updating to Xcode7 I got nearly 20 errors and 50 warnings.This might be some syntax change in Swift 2

Solved all those but can't figure out this one : Downcast from UITabBarItem? to UITabBarItem only unwraps optionals; did you mean to use '!' The below is the actual code:

let tabItems = tabBar.items as! [UITabBarItem]  // Error in  this line
for (index, value) in enumerate(tabItems)
{
    var imageName = imageNames[index]
    value.image = UIImage(named: imageName)
    value.imageInsets = UIEdgeInsetsMake(5.0, 0, -5.0, 0)
}

It shows me 1 error

When I tried doing this:

if let tabItems = tabBar.items as [UITabBarItem]? {
for (index, value) in tabItems.enumerate()
{
    var imageName = imageNames[index]
    value.image = UIImage(named: imageName)
    value.imageInsets = UIEdgeInsetsMake(5.0, 0, -5.0, 0)
}
}

It is showing me 5 Errors::

  1. "_UTTypeCopyPreferredTagWithClass", referenced from: -[PFFile _mimeType] in Parse(PFFile.o) 2. "_UTTypeCreatePreferredIdentifierForTag", referenced from: -[PFFile _mimeType] in Parse(PFFile.o) 3. "_kUTTagClassFilenameExtension", referenced from: -[PFFile _mimeType] in Parse(PFFile.o) 4."_kUTTagClassMIMEType", referenced from: -[PFFile _mimeType] in Parse(PFFile.o) ld: symbol(s) not found for architecture x86_64 5.clang: error: linker command failed with exit code 1 (use -v to see invocation)

Please help! Thanks in advance

Upvotes: 0

Views: 533

Answers (1)

M. Kremer
M. Kremer

Reputation: 679

If there are some TabBarItems, tabBar.items will return you an array of UITabBarItem. If not it will return you nil (It is an optional ). So it would be "dumb" to cast it again to [UITabBarItem]. this is like saying: I have many apples, make some apples out of it. BUT you need to handle the case that tabBar.items is nil. So you just need to unwrap tabBar.items by adding an "!" to it like this:

 let tabItems = tabBar.items!

This should work :)

Upvotes: 0

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