我正在创建一个 UIButton 子类来添加一些绘图。它在代码中运行良好。当我尝试通过 @IBdesignable 时,它给出以下错误。
错误:IB Designables:无法更新自动布局状态: 代理崩溃了
错误:IB Designables:无法渲染实例 DashboardHeaderView:代理崩溃了
以下是代码示例
let context:CGContextRef = UIGraphicsGetCurrentContext()!
UIGraphicsPushContext(context)
UIGraphicsBeginImageContextWithOptions(rect.size, false, 0.0);
var path:UIBezierPath!
let pathRect:CGRect = CGRectMake(strokeWidth / 2, strokeWidth / 2, pathSize - iconStrokeWidth, pathSize - iconStrokeWidth);
path = UIBezierPath(rect: pathRect )
iconColor.setStroke()
iconPath.lineWidth = iconStrokeWidth;
iconPath.stroke()
CGContextAddPath(context, iconPath.CGPath);
let image:UIImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsPopContext();
UIGraphicsEndImageContext();
代理崩溃错误位于
let context:CGContextRef = UIGraphicsGetCurrentContext()!
我覆盖了 init + drawRect + initilizeButtonDrawings 但没有得到任何积极的结果
required init(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)!
self.initilizeButtonDrawings()
}
override init(frame: CGRect) {
super.init(frame: frame)
self.initilizeButtonDrawings()
}
override func drawRect(rect:CGRect) {
super.drawRect(rect)
self.initilizeButtonDrawings()
}
override func prepareForInterfaceBuilder () {
self.initilizeButtonDrawings()
}
所有这些在 Objective C 中运行良好,但在 swift 中崩溃
最佳答案
我通过以下更新解决了这个问题...
let rect:CGRect = CGRectMake(0, 0, iconSize, iconSize)
UIGraphicsBeginImageContextWithOptions(rect.size, false, 0.0);
let context = UIGraphicsGetCurrentContext()
// draw icon
var iconPath:UIBezierPath!
let iconRect:CGRect = CGRectMake(iconStrokeWidth / 2, iconStrokeWidth / 2, iconSize - iconStrokeWidth, iconSize - iconStrokeWidth);
if self.iconSquare {
iconPath = UIBezierPath(rect:iconRect )
} else {
iconPath = UIBezierPath(ovalInRect:iconRect)
}
iconColor.setStroke()
iconPath.lineWidth = iconStrokeWidth;
iconPath.stroke()
CGContextAddPath(context, iconPath.CGPath);
let image:UIImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
关于ios - CGContextRef 无法与 @IBDesignable 一起使用(错误 :The agent Crashed),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/34216879/