CGRectMake, CGPointMake, CGSizeMake, CGRectZero, C

问题:

After converting code to latest swift 3.0 I am shown this error.

Also tell me solution for CGSize = CGSizeMake(0,0)

static var frameAtStartOfPan: CGRect = CGRectZero
static var startPointOfPan: CGPoint = CGPointZero

Which is also unavailable.

回答1:

CGRect Can be simply created using an instance of a CGPoint or CGSize, thats given below.

let rect = CGRect(origin: CGPoint(x: 0,y :0), size: CGSize(width: 100, height: 100))  

// Or

let rect = CGRect(origin: .zero, size: CGSize(width: 100, height: 100))

Or if we want to specify each value in CGFloat or Double or Int, we can use this method.

let rect = CGRect(x: 0, y: 0, width: 100, height: 100) // CGFloat, Double, Int

CGPoint Can be created like this.

 let point = CGPoint(x: 0,y :0) // CGFloat, Double, Int

CGSize Can be created like this.

let size = CGSize(width: 100, height: 100) // CGFloat, Double, Int

Also size and point with 0 as the values, it can be done like this.

let size = CGSize.zero // width = 0, height = 0
let point = CGPoint.zero // x = 0, y = 0, equal to CGPointZero
let rect = CGRect.zero // equal to CGRectZero

CGRectZero & CGPointZero replaced with CGRect.zero & CGPoint.zero in Swift 3.0.

回答2:

Quick fix for CGRectMake , CGPointMake, CGSizeMake in Swift3 & iOS10

Add these extensions :

extension CGRect{
    init(_ x:CGFloat,_ y:CGFloat,_ width:CGFloat,_ height:CGFloat) {
        self.init(x:x,y:y,width:width,height:height)
    }

}
extension CGSize{
    init(_ width:CGFloat,_ height:CGFloat) {
        self.init(width:width,height:height)
    }
}
extension CGPoint{
    init(_ x:CGFloat,_ y:CGFloat) {
        self.init(x:x,y:y)
    }
}

Then go to \"Find and Replace in Workspace\" Find CGRectMake , CGPointMake, CGSizeMake and Replace them with CGRect , CGPoint, CGSize

These steps might save all the time as Xcode right now doesn\'t give us quick conversion from Swift 2+ to Swift 3

回答3:

In Swift 3, you can simply use CGPoint.zero or CGRect.zero in place of CGRectZero or CGPointZero.

However, in Swift 4, CGRect.zero and \'CGPoint.zero\' will work

回答4:

The structures as well as all other symbols in Core Graphics and other APIs have become cleaner and also include parameter names. https://developer.apple.com/reference/coregraphics#symbols

CGRect(x: Int, y: Int, width: Int, height: Int)
CGVector(dx: Int, dy: Int)
CGPoint(x: Double, y: Double)
CGSize(width: Int, height: Int)

CGPoint Example:

let newPoint = stackMid.convert(CGPoint(x: -10, y: 10), to: self)

CGVector Example:

self.physicsWorld.gravity = CGVector(dx: 0, dy: gravity)

CGSize Example:

hero.physicsBody = SKPhysicsBody(rectangleOf: CGSize(width: 16, height: 18))

CGRect Example:

let back = SKShapeNode(rect: CGRect(x: 0-120, y: 1024-200-30, width: 240, height: 140), cornerRadius: 20)

Apple Blog

Swift syntax and API renaming changes in Swift 3 make the language feel more natural, and provide an even more Swift-y experience when calling Cocoa frameworks. Popular frameworks Core Graphics and Grand Central Dispatch have new, much cleaner interfaces in Swift.

回答5:

If you want to use them as in swift 2, you can use these funcs:

For CGRectMake:

func CGRectMake(_ x: CGFloat, _ y: CGFloat, _ width: CGFloat, _ height: CGFloat) -> CGRect {
    return CGRect(x: x, y: y, width: width, height: height)
}

For CGPointMake:

func CGPointMake(_ x: CGFloat, _ y: CGFloat) -> CGPoint {
    return CGPoint(x: x, y: y)
}

For CGSizeMake:

func CGSizeMake(_ width: CGFloat, _ height: CGFloat) -> CGSize {
    return CGSize(width: width, height: height)
}

Just put them outside any class and it should work. (Works for me at least)

回答6:

Try the following:

var myToolBar = UIToolbar.init(frame: CGRect.init(x: 0, y: 0, width: 320, height: 44))

This is for the swift\'s latest version

回答7:

Swift 3 Bonus: Why didn\'t anyone mention the short form?

CGRect(origin: .zero, size: size)

.zero instead of CGPoint.zero

When the type is defined, you can safely omit it.

回答8:

In Swift 4 it works like below

collectionView.setContentOffset(CGPoint.zero, animated: true)

回答9:

You can use this with replacement of CGRectZero

CGRect.zero