Objective C Setter overriding in Swift(Swift中的Objective C Setter覆盖)
本文介绍了Swift中的Objective C Setter覆盖的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我需要在我的自定义 UIButton 子类中覆盖 UIViews 高亮属性的设置器;
I need to override the setter of UIViews highlighted property in my custom UIButton subclass ;
目标 C
@property(nonatomic,getter=isHighlighted) BOOL highlighted;
像这样被覆盖
- (void) setHighlighted:(BOOL)highlighted {
[super setHighlighted:highlighted];
if (highlighted) {
self.backgroundColor = UIColorFromRGB(0x387038);
}
else {
self.backgroundColor = UIColorFromRGB(0x5bb75b);
}
[super setHighlighted:highlighted];
}
斯威夫特
var highlighted: Bool
我试过了:
var highlighted: Bool {
get{ return false }
set {
if highlighted {
self.backgroundColor = UIColor.whiteColor()
//Error "Use unresolved identifier 'self'"
I can't set the background color from value type in here
, can't call self.backgroundColor in this value type ,
can't call super too because this is a value type , doesn't work
}
}
}
在 Swift 中应该如何以及在何处实现此方法以获得相同的结果.有什么想法吗?
How and where should implement this method in Swift to get the same result . any idea?
推荐答案
在 Swift 中,上面的解决方案对我有用,但我不得不省略 Bool= 真:
In Swift the solution above worked for me, but I had to omit the Bool = true:
import UIKit
class CustomUIButtonForUIToolbar: UIButton {
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
override func drawRect(rect: CGRect) {
// Drawing code
super.drawRect(rect)
self.layer.borderColor = UIColor.blueColor().CGColor
self.layer.borderWidth = 1.0
self.layer.cornerRadius = 5.0
self.clipsToBounds = true
self.setTitleColor(UIColor.blueColor(), forState: UIControlState.Normal)
self.setTitleColor(UIColor.whiteColor(), forState: UIControlState.Highlighted)
}
override var highlighted: Bool {
didSet {
if (highlighted) {
self.backgroundColor = UIColor.blueColor()
}
else {
self.backgroundColor = UIColor.clearColor()
}
}
}
}
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