In Xcode 6.1. 'UIImage?' does not have a member named 'size' Error

问题

I'm getting an image's Size and used the below code. It was working perfectly fine with Xcode 6.0.1. After updating to Xcode 6.1, I'm getting Error Like :

'UIImage?' does not have a member named 'size'

var image = UIImage(named: imageName)
let sizeOfImage = image.size

Is it bug with my code or Apple ? Please help me in here. TIA.

回答1:

That initializer is now a failable initializer, and as such it returns an optional UIImage.

To quickly fix your bug just unwrap the image:

let sizeOfImage = image?.size

but I presume you will reference the image variable more than just once in your code, in that case I suggest using optional binding:

if let image = image {
    let sizeOfImage = image.size
    /// ...
    /// Use the image
}

回答2:

In addition to @Antonio's answer you can use nil coalescing operator(??) to get a default size in case image initializer is failed. Here is how:

let size = image?.size ?? CGSizeZero

回答3:

Once you’re sure that the optional does contain a value, you can access its underlying value by adding an exclamation mark (!) to the end of the optional’s name. In your case: image.size!

回答4:

you can use like this:

    let image = UIImage(named: "photo1.png")
    let sizeOfImage = image?.size

    imageView.image = image
    imageView.frame = CGRect(origin: CGPoint(x: 0, y: 0), size: sizeOfImage!)

来源：https://stackoverflow.com/questions/26582035/in-xcode-6-1-uiimage-does-not-have-a-member-named-size-error