self.image.frame.width = 20 give get only property error

问题

i tried to change the width of my Image view to 20 @IBOutlet weak var image: UIImageView! using this code in viewDidLoad self.image.frame.width = 20 but it give me error cannot assign to property: width is a get only property. what does that mean?? sorry i am new to swift i do not know what it mean.please help

回答1:

get-only means you can only read this property (for example to compare with something), but not change. To set width you need this:

self.image.frame.size.width = foo

回答2:

There is 2 ways to solve this:

1. self.image.frame.size.width = some value

2. You can add width constraint to your view (by code, storyboard or xib) and set this constraint's constant property to some value

回答3:

Swift:

let widthValue = self.view.frame.size.width
self.btnName.frame.size.width = widthValue
self.txtEMail.frame.size.width = (widthValue - 32)
self.lblUserName.frame.size.width = (widthValue * 2)

来源：https://stackoverflow.com/questions/39109224/self-image-frame-width-20-give-get-only-property-error