Difficulties converting to Swift 3

Most of them are easy fixes, simply by tapping the red button, and having Xcode fix it for you! Others include:

CGRect

Swift 2:

let frame = CGRectMake(0, 0, 20, 20)

Swift 3:

let frame = CGRect(x: 0, y: 0, width: 20, height: 20)

CGPoint

Swift 2:

let point = CGPointMake(0, 0)

Swift 3:

let point = CGPoint(x: 0, y: 0)

CGSize

Swift 2:

let size = CGSizeMake(20, 20)

Swift 3:

let size = CGSize(width: 20, height: 20)

CGRectGetMidX

Swift 2:

CGRectGetMidX(view)

Swift 3:

view.midX

CGRectGetMidY

Swift 2:

CGRectGetMidY(view)

Swift 3:

view.midY

UIColor

Swift 2:

let color = UIColor.redColor()

Swift 3:

let color = UIColor.red

"NS"

Swift 2:

NSTimerNSDataNSError

Swift 3:

TimerDataError

UserDefaults

Swift 2:

NSUserDefaults.standardUserDefaults().//something

Swift 3:

UserDefaults.standard.//something

And always remember to use the helpful "Fix all in Scope" function which can be found at Editor -> Fix all in Scope

I was converting a project and Xcode was not helping me with any fixes so I resorted to a couple of regex search-and-replaces:-

CGPointMake\((.*),[ ]*([^\)]+)\)CGPoint(x:$1, y:$2)CGSizeMake\((.*),[ ]*([^\)]+)\)CGSize(width:$1, height:$2)

Note they are not aware of nested parentheses , but probably good enough for 90% of cases.