這是我RectangleView
:迅速的UIView沒有一個成員叫中心
import UIKit
class RectangleView: UIView
{
init(frame: CGRect)
{
// Initialization code
super.init(frame: frame)
}
/*
override func drawRect(rect: CGRect)
{
// Drawing code
}
*/
}
我添加此RectangleView
我CustomViewController
:
import UIKit
class CustomViewController: UIViewController
{
var ballX:Int = 0
var ballY:Int = 0
let BALLWIDTH:Int = 50
let BALLHEIGHT:Int = 50
var navigationHeight:Double = 0.0
var pos:CGPoint?
var rectangleView:RectangleView?
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.ballX = Int(arc4random_uniform(320));
self.ballY = Int(arc4random_uniform(480));
self.navigationHeight = Double(self.navigationController.navigationBar.frame.size.height)
var rect = CGRect(x: 0, y: 0, width: self.BALLWIDTH, height: self.BALLHEIGHT)
self.pos = CGPoint(x: self.ballX, y: self.ballY);
println("x: \(self.ballX), y: \(self.ballY)")
self.rectangleView = RectangleView(frame: rect)
self.rectangleView!.backgroundColor = UIColor.redColor()
self.view.addSubview(self.rectangleView!)
NSTimer.scheduledTimerWithTimeInterval(0.05, target: self, selector: Selector("moveBall"), userInfo: nil, repeats: true)
}
func moveBall()
{
self.rectangleView!.center = CGPointMake(self.rectangleView!.center + self.pos!.x, self.rectangleView!.center + self.pos!.y)
}
...
而且我得到一個錯誤信息
'RectangleView?' does not have a member named 'center'
我應該在我的RectangleView
上定義這個center
?我的RectangleView
繼承自UIView
,所以我感到非常困惑。謝謝你的幫助。
編輯
我使用此代碼
func moveBall()
{
if let rv = self.rectangleView {
rv.center = CGPointMake(rv.center + self.pos!.x, rv.center + self.pos!.y)
}
我得到了新的錯誤消息
'CGPoint' is not convertible to 'UInt8'
我覺得rv.center
類型爲UInt8
,但self.post!.x
是nsnumber
,所以我怎麼可以轉換爲CGPointMake
接受類型?我已經轉換UInt8(self.pos!.x)
並將計算結果再次轉換爲CGPointMake
接受類型?
有沒有其他最好的方法?謝謝你的幫助。
我很好奇。如果你添加一秒會發生什麼!當你嘗試訪問中心時。 'self.rectangleView !!。center'? – connor
同樣,這給了我相同的錯誤信息。 – lighter