如何使用图像设置UIButton的高度和宽度

Question

这让我疯了.我到处寻找,无法弄清楚这一点.看看这个...

    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.我尝试的一切都给了我一个错误或者只是没有用.我仍然试图围绕translatesAutoresizingMaskIntoConstraints做什么.我只是想让按钮在哪里,但改变它的大小(高度和宽度).

提前致谢

编辑:我已经改变了一些代码

    // 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度50 x宽度50.我将如何实现这一目标？

编辑2:我认为你必须使用自动布局这样做,但有人可以告诉我如何.我所做的一切都没有奏效.

Answer 1

所以在这里我写了一个代码来添加视图上的按钮.

斯威夫特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])

斯威夫特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])

Answer 2

斯威夫特3

findMeButton.frame.size = CGSize(width, height)

Answer 3

只需设置按钮大小即可

findMeButton.frame.size = CGSizeMake(width, height)

或者您可以指定按钮位置和大小

findMeButton.frame = CGRectMake(x, y, width, height)