Swift-如何在按钮上显示图像？

我试图在一个按钮上显示一个图像，我在按钮上得到图像的蓝图，到目前为止我已经试过了-

override func viewDidLoad()
{
    super.viewDidLoad()

    var birdTexture1 = UIImage(named: "fish.png") as UIImage
    button1.frame = CGRectMake(100, 10, 50, 150)
    button1.setImage(birdTexture1, forState: .Normal)

    button1.setTitle("Testing", forState: UIControlState.Normal)
    button1.addTarget(self, action: "btnAction:", forControlEvents:  UIControlEvents.TouchUpInside)
    self.view.addSubview(button1)

    // Do any additional setup after loading the view, typically from a nib.
}

通过上面的代码，我得到以下输出

但实际情况是这样的-

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我认为您的UIButton应该是UIButtonTypeCustom类型，而不是UIButtonTypeSystem类型。您可以这样构造它，或者需要在interface builder中更新UIButton的属性

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更多信息：：

我想替换此代码：

let birdTexture1 = UIImage(named: "fish.png")! as UIImage
let button1:UIButton=UIButton(frame:CGRectMake(100, 50, 50, 150))
button1.setBackgroundImage(birdTexture1, forState: .Normal)
button1.setTitle("Testing", forState: .Normal)
button1.addTarget(self, action: #selector(ViewController.btnActionClick(_:)), forControlEvents: UIControlEvents.TouchUpInside)
self.view.addSubview(button1)

@IBAction func btnActionClick(sender:AnyObject){

}

---

还可以添加到目标中的图像

将按钮类型更改为

uibuttonypecustom

@0x7fffffff谢谢，它确实有效。。。