这让我抓狂。我到处都看过，但无法弄清楚。检查一下...

    let findMeButton = UIButton(type: UIButtonType.System)

    findMeButton.translatesAutoresizingMaskIntoConstraints = false

    findMeButton.setImage(UIImage(named: "locateMe"), forState: UIControlState.Normal)

    findMeButton.addTarget(self, action: #selector(MapViewController.findUserLocation(_:)), forControlEvents: UIControlEvents.TouchUpInside)

    view.addSubview(findMeButton)

    // I added this line of code and it still doesn't work.
    findMeButton.frame.size = CGSizeMake(50, 50)

    findMeButton.bottomAnchor.constraintEqualToAnchor(bottomLayoutGuide.topAnchor, constant: -10).active = true

    findMeButton.trailingAnchor.constraintEqualToAnchor(margins.trailingAnchor, constant: 5).active = true

我还在学习 iOS。如何使用图像设置此 UIButton 的高度和宽度。我尝试过的一切都给了我一个错误或者只是没有用。我仍在努力思考 translatesAutoresizingMaskIntoConstraints 的作用。我只是想让按钮保持原样，但要更改其大小(高度和宽度)。

提前致谢

编辑:我已经将代码更改为这个

    // Locate user button
    let locateButton = UIButton(type: UIButtonType.System) as UIButton

    locateButton.frame = CGRectMake(0, 0, 50, 50)

    locateButton.setBackgroundImage(UIImage(named: "locateMe"), forState: UIControlState.Normal)

    locateButton.addTarget(self, action: #selector(MapViewController.findUserLocation(_:)), forControlEvents: UIControlEvents.TouchUpInside)

    view.addSubview(locateButton)

我想将按钮定位到窗口底部和右边距。我还想将图像尺寸设置为高 50 x 宽 50。我该如何实现？

编辑 2: 我认为您必须使用自动布局才能这样做，但有人可以告诉我如何操作。我所做的一切都没有奏效。

最佳答案

所以我在这里写了一段代码来在 View 上添加按钮。

swift 3:

let button   = UIButton(type: UIButtonType.System) as UIButton
// set the frame
button.frame = CGRectMake(100, 100, 100, 50)
// add image
button.setBackgroundImage(UIImage(named:"SearchIcon" ), forState: UIControlState.Normal)
// button title
button.setTitle("Test Button", forState: UIControlState.Normal)
// add action
button.addTarget(self, action: #selector(RootViewController.updateView), forControlEvents: UIControlEvents.TouchUpInside)

button.translatesAutoresizingMaskIntoConstraints = false
// add button on view
self.view.addSubview(button)
// all constaints
let widthContraints =  NSLayoutConstraint(item: button, attribute: NSLayoutAttribute.Width, relatedBy: NSLayoutRelation.Equal, toItem: nil, attribute: NSLayoutAttribute.NotAnAttribute, multiplier: 1, constant: 200)
let heightContraints = NSLayoutConstraint(item: button, attribute: NSLayoutAttribute.Height, relatedBy: NSLayoutRelation.Equal, toItem: nil, attribute: NSLayoutAttribute.NotAnAttribute, multiplier: 1, constant: 100)
let xContraints = NSLayoutConstraint(item: button, attribute: NSLayoutAttribute.CenterX, relatedBy: NSLayoutRelation.Equal, toItem: view, attribute: NSLayoutAttribute.CenterX, multiplier: 1, constant: 0)
let yContraints = NSLayoutConstraint(item: button, attribute: NSLayoutAttribute.CenterY, relatedBy: NSLayoutRelation.Equal, toItem: view, attribute: NSLayoutAttribute.CenterY, multiplier: 1, constant: 0)
NSLayoutConstraint.activateConstraints([heightContraints,widthContraints,xContraints,yContraints])

swift 4:

let button   = UIButton(type: UIButtonType.system) as UIButton
// set the frame
button.frame = CGRect(x: 100, y: 100, width: 100, height: 50)
// add image
button.setBackgroundImage(UIImage(named:"SearchIcon"), for: .normal)
// button title
button.setTitle("Test Button", for: .normal)
// add action
button.addTarget(self, action: #selector(RootViewController.updateView), forControlEvents: UIControlEvents.TouchUpInside)

button.translatesAutoresizingMaskIntoConstraints = false
// add button on view
self.view.addSubview(button)
// all constaints
let widthContraints =  NSLayoutConstraint(item: button, attribute: NSLayoutAttribute.width, relatedBy: NSLayoutRelation.equal, toItem: nil, attribute: NSLayoutAttribute.notAnAttribute, multiplier: 1, constant: 200)
let heightContraints = NSLayoutConstraint(item: button, attribute: NSLayoutAttribute.height, relatedBy: NSLayoutRelation.equal, toItem: nil, attribute: NSLayoutAttribute.notAnAttribute, multiplier: 1, constant: 100)
let xContraints = NSLayoutConstraint(item: button, attribute: NSLayoutAttribute.centerX, relatedBy: NSLayoutRelation.equal, toItem: view, attribute: NSLayoutAttribute.centerX, multiplier: 1, constant: 0)
let yContraints = NSLayoutConstraint(item: button, attribute: NSLayoutAttribute.centerY, relatedBy: NSLayoutRelation.equal, toItem: view, attribute: NSLayoutAttribute.centerY, multiplier: 1, constant: 0)
NSLayoutConstraint.activate([heightContraints,widthContraints,xContraints,yContraints])

swift 4.2:

let button   = UIButton(type: UIButton.ButtonType.system) as UIButton
        // set the frame
button.frame = CGRect(x: 100, y: 100, width: 100, height: 50)
 // add image
button.setBackgroundImage(UIImage(named:"SearchIcon"), for: .normal)
 // button title
button.setTitle("Test Button", for: .normal)
 // add action
button.addTarget(self, action: #selector(didTapOnTakePhotoButton), for: UIControl.Event.touchUpInside)

button.translatesAutoresizingMaskIntoConstraints = false
 // add button on view
self.view.addSubview(button)
 // all constaints
let widthContraints =  NSLayoutConstraint(item: button, attribute: NSLayoutConstraint.Attribute.width, relatedBy: NSLayoutConstraint.Relation.equal, toItem: nil, attribute: NSLayoutConstraint.Attribute.notAnAttribute, multiplier: 1, constant: 200)
let heightContraints = NSLayoutConstraint(item: button, attribute: NSLayoutConstraint.Attribute.height, relatedBy: NSLayoutConstraint.Relation.equal, toItem: nil, attribute: NSLayoutConstraint.Attribute.notAnAttribute, multiplier: 1, constant: 100)
let xContraints = NSLayoutConstraint(item: button, attribute: NSLayoutConstraint.Attribute.centerX, relatedBy: NSLayoutConstraint.Relation.equal, toItem: view, attribute: NSLayoutConstraint.Attribute.centerX, multiplier: 1, constant: 0)
let yContraints = NSLayoutConstraint(item: button, attribute: NSLayoutConstraint.Attribute.centerY, relatedBy: NSLayoutConstraint.Relation.equal, toItem: view, attribute: NSLayoutConstraint.Attribute.centerY, multiplier: 1, constant: 0)
NSLayoutConstraint.activate([heightContraints,widthContraints,xContraints,yContraints])

关于swift - 你如何设置带有图像的 UIButton 的高度和宽度，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/37474237/