如何初始化相互依賴的屬性我想要一張照片移到底部。如果我按下按鈕，圖片應該向下移動1。我添加了圖片和按鈕：var corX = 0var corY = 0var runter: UIButton = UIButton.buttonWithType(UIButtonType.System) as UIButtonvar
image = UIImage(named: "panzerBlau.jpg");var panzer = UIImageView(frame: CGRectMake(corX, corY, 30, 40));
//override func viewDidLoad() {
super.viewDidLoad()
panzer.image = image; // self.view.addSubview(panzer); //
runter.frame = CGRectMake(100, 30, 10 , 10)
runter.backgroundColor = UIColor.redColor()
view.addSubview(runter)
runter.addTarget(self, action: "fahren", forControlEvents:UIControlEvents.TouchUpInside)}至少我在函數“fahren”中說把圖片向下移動1。func fahren(){
corY += 1
panzer.frame = CGRectMake(corX, corY, 30, 40) // self.view.addSubview(panzer);}所以我的問題是：這些corx和cory的東西有幾個錯誤。沒有它們，它工作的完美，但它比一個單一用途按鈕。錯誤是：ViewController.Type沒有一個名為corX的成員，而ViewController.Type沒有一個成員名為panzer，在這里我得到了我所做的/顯示在哪些行中的錯誤。PS：我使用Xcode Beta 5下面是沒有其他任何內容的完整代碼：import UIKitclass ViewController: UIViewController {
var corX = 0
var corY = 0
var runter: UIButton = UIButton.buttonWithType(UIButtonType.System) as UIButton
var image = UIImage(named: "panzerBlau.jpg");
var panzer = UIImageView(frame: CGRectMake(corX, corY, 30, 40));
override func viewDidLoad() {
super.viewDidLoad()
panzer.image = image;
self.view.addSubview(panzer);
runter.frame = CGRectMake(100, 30, 10 , 10)
runter.backgroundColor = UIColor.redColor()
view.addSubview(runter)
runter.addTarget(self, action: "fahren", forControlEvents:UIControlEvents.TouchUpInside)
}
func fahren(){
corY += 100
panzer.frame = CGRectMake(corX, corY, 30, 40)
self.view.addSubview(panzer);
}}
3 回答
慕絲7291255
TA貢獻1859條經驗 獲得超6個贊
var corX = 0var corY = 0var panzer = UIImageView(frame: CGRectMake(corX, corY, 30, 40))
panzerself.corXself.corYselfself
class ViewController: UIViewController {
var corX : CGFloat = 0
var corY : CGFloat = 0
lazy var panzer : UIImageView = UIImageView(frame: CGRectMake(self.corX, self.corY, 30, 40))
// ...}panzerself
幕布斯6054654
TA貢獻1876條經驗 獲得超7個贊
lazy明示 : Type使用 self.訪問其他屬性
let original = "foo"
// Good:
lazy var depend: String = self.original
// Error:
var noLazy: String = self.original // Error: Value of type '(NSObject) -> () -> URLData' has no member 'original'
lazy var noType = self.original // Error: Value of type '(NSObject) -> () -> URLData' has no member 'original'
lazy var noSelf: String = original // Error: Instance member 'original' cannot be used on type 'YourClass'
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