xcode IBDesignable UIButton 子类
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IBDesignable UIButton Subclass
提问by Fergal Rooney
I am trying to implement a simple UIButton subclass that is IBDesignable. I want the ability to set a color for each state of the control from Interface Builder. I know this is possible with the IBInspectable keyword. I am having problems with IB crashing when using KVO on the state property. The IBDesignable debugger crashes on deinit. Does anyone know how I can work with KVO and IBDesignable together?
我正在尝试实现一个简单的 UIButton 子类，它是 IBDesignable。我希望能够从 Interface Builder 为控件的每个状态设置颜色。我知道这可以通过 IBInspectable 关键字实现。在 state 属性上使用 KVO 时，我遇到了 IB 崩溃的问题。IBDesignable 调试器在 deinit 时崩溃。有谁知道我如何与 KVO 和 IBDesignable 一起工作？
@IBDesignable
class UIButtonActionButton: UIButton {
@IBInspectable var defaultColour: UIColor = UIColor.blueColor() {
didSet {
self.setNeedsDisplay()
}
}
@IBInspectable var selectedColour: UIColor = UIColor.blueColor()
@IBInspectable var disabledColour: UIColor = UIColor.grayColor()
required init(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
self._setup()
}
override init(frame: CGRect) {
super.init(frame: frame)
self._setup()
}
private func _setup(){
self.addObserver(self, forKeyPath: "state", options: NSKeyValueObservingOptions.New, context: nil)
self.layer.cornerRadius = 5.0
self.layer.masksToBounds = true
}
override func observeValueForKeyPath(keyPath: String, ofObject object: AnyObject, change: [NSObject : AnyObject], context: UnsafeMutablePointer<Void>) {
self.setNeedsDisplay()
}
override func drawRect(rect: CGRect) {
super.drawRect(rect)
let context = UIGraphicsGetCurrentContext()
if self.highlighted {
CGContextSetFillColorWithColor(context, selectedColour.CGColor)
CGContextFillRect(context, self.bounds)
} else if self.state == UIControlState.Disabled {
CGContextSetFillColorWithColor(context, disabledColour.CGColor)
CGContextFillRect(context, self.bounds)
} else {
CGContextSetFillColorWithColor(context, defaultColour.CGColor)
CGContextFillRect(context, self.bounds)
}
}
deinit {
self.removeObserver(self, forKeyPath: "state", context: nil)
}
}
采纳答案by Daniel
I was having something similar the problem was the init()method which caused the crash after refactoring my code it works like a charm. Maybe it will help you:
我遇到了类似的问题，问题是init()在重构我的代码后导致崩溃的方法，它就像一个魅力。也许它会帮助你：
#if !TARGET_INTERFACE_BUILDER
required init(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
self._setup()
}
#endif
override func prepareForInterfaceBuilder() {
self._setup()
}
回答by skywinder
For Xcode 7.2common code for @IBDesignable UIButton Subclasslooks like this:
对于Xcode 7.2 的通用代码@IBDesignable UIButton Subclass如下所示：
import UIKit
@IBDesignable class MyButton: UIButton {
//this init fires usually called, when storyboards UI objects created:
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
self.setupViews()
}
//This method is called during programmatic initialisation
override init(frame: CGRect) {
super.init(frame: frame)
setupViews()
}
func setupViews() {
//your common setup goes here
}
//required method to present changes in IB
override func prepareForInterfaceBuilder() {
super.prepareForInterfaceBuilder()
self.setupViews()
}
}
