Subclassed UIButton使一个圆，结束了一个矩形

Question

我有以下类名为PushButtonView。它的子类UIButton

import UIKit 

@IBDesignable 
class PushButtonView: UIButton { 
// Only override drawRect: if you perform custom drawing. 
// An empty implementation adversely affects performance during animation. 
@IBInspectable var fillColor: UIColor = UIColor.greenColor() 
@IBInspectable var isAddButton: Bool = true 
@IBInspectable var borderColor: UIColor = UIColor.blackColor() 
@IBInspectable var useBorder: Bool = false 
@IBInspectable var borderWidth: CGFloat = 1.0 

override func drawRect(rect: CGRect) { 
    var path = UIBezierPath(ovalInRect: rect) 
    fillColor.setFill() 

    //Path's don't draw anything. To draw the path, fill it. 
    path.fill() 

    //Set up width and height variables for the plus 
    let plusHeight: CGFloat = 3.0 
    let plusWidth: CGFloat = min(bounds.width, bounds.height) * 0.6 

    //Create the path 
    var plusPath = UIBezierPath() 

    //Set the path's line width to the height of the stroke 
    plusPath.lineWidth = plusHeight 

    //Move the initial point of the path to the start of the horizontal stroke. 
    //Point is the middle of the button - half of the width of the plus. 
    plusPath.moveToPoint(CGPoint(x: bounds.width/2 - plusWidth/2 + 0.5, y: bounds.height/2 + 0.5)) 

    //Add a point to the path at the end of the stroke. 
    //Final point is the middle of the button + half of the width of the plus. 
    plusPath.addLineToPoint(CGPoint(x: bounds.width/2 + plusWidth/2 + 0.5, y: bounds.height/2 + 0.5)) 

    if isAddButton { 
     //Move the initial point of the path to the start of the vertical stroke. 
     //Point is the middle of the button. Start point is half of the height - half of the width of the plus. 
     plusPath.moveToPoint(CGPoint(x: bounds.width/2 + 0.5, y: bounds.height/2 - plusWidth/2 + 0.5)) 

     //Add a point to the path at the end of the stroke. 
     //Final point is the middle of the button. Start pointis half of the heigh + half of the width of the plus 
     plusPath.addLineToPoint(CGPoint(x: bounds.width/2 + 0.5, y: bounds.height/2 + plusWidth/2 + 0.5)) 
    } 

    //Set the stroke color 
    UIColor.whiteColor().setStroke() 

    //Stroke the path 
    plusPath.stroke() 

    if useBorder { 
     //Extra code here. Paints a black border around the button. In order for it to be round, the 
     //button width and height must be the same. The cornerRadius must be half of the width (or height). 
     super.layer.borderColor = borderColor.CGColor 
     super.layer.borderWidth = borderWidth 
     super.layer.cornerRadius = super.frame.width/2 + 0.5 
    } 
} 
} 

本来，我是用这个来创建一个视图按钮。我会在视图上放一个UIBUtton，然后将该类设置为PushButtonView。只要按钮的宽度和高度是相同的大小，按钮就会呈现圆形。

现在我试图通过在代码中创建按钮来使用此类。当我这样做时，我最终得到一个方形按钮，而不是一个圆形按钮。这里是创建按钮的代码。

button1 = PushButtonView(frame: CGRectMake(0, 0, 50, 50)) 
    button1.frame = CGRectMake(0, 0, 50, 50) 
    button1.center = CGPointMake(self.view.frame.width/2, label.center.y - (label.frame.height/2) - 50) 
    button1.fillColor = UIColor.greenColor() 
    button1.addTarget(self, action: "button1Clicked", forControlEvents: .TouchUpInside) 
    self.view.addSubview(button1) 

当我运行它时，按钮不是圆形;这是一个正方形。

如果我直接在视图上拖放一个UIButton并将该类设置为PushButtonView，那么我最终会得到一个圆形按钮。

我在哪里出错代码来编程创建按钮？

Answer 1

我认为你必须设置useBorder：

button1.useBorder = true 

否则层的cornerRadius不被设置。

如果这是正确的，将来，通过在drawRect中设置断点并逐步执行实现，可能更容易进行调试。