如何方向拟合条形按钮图像

Question

我想在导航栏按钮中添加图片。

这是我要设置的图片：

我将bar button拖到Main.storyboard进行设置。然后我这样设置：

@IBOutlet var addNewNoteButton: UIBarButtonItem!

...

let featherImageView = UIImageView()
featherImageView.contentMode = UIViewContentMode.ScaleAspectFit

featherImageView.image = UIImage(named: "feather")?.imageWithRenderingMode(.AlwaysOriginal)
addNewNoteButton.image = featherImageView.image

但它没有很好地显示图像：

＆＃39;

我也看到了某处，但他们只创建了一个按钮，然后将此按钮指定给导航栏按钮。

任何帮助都将不胜感激。

Answer 1

您可以为此创建自定义按钮。在viewDidLoad方法中使用以下代码。

//create a new button
let button: UIButton = UIButton(type: .Custom)

//set image for button
button.setImage(UIImage(named: "T018d.png"), forState: UIControlState.Normal)

//set frame
button.frame = CGRectMake(0, 0, 53, 31)

let barButton = UIBarButtonItem(customView: button)

//assign button to navigationbar
self.navigationItem.rightBarButtonItem = barButton

结果将是：

如果您想将其放在左侧，请更换此行

self.navigationItem.rightBarButtonItem = barButton

带

self.navigationItem.leftBarButtonItem = barButton

Answer 2

解决方案Swift 4：

let barButton = UIButton()

self.backButton = UIButton(frame: CGRect(x: 0, y: 0, width: 30, height: 30))
backButton.setImage(UIImage(named: "image"), for: .normal)
backButton.setImage(UIImage(named: "image"), for: .highlighted)
backButton.imageView?.contentMode = .scaleAspectFit
backButton.addTarget(self, action: #selector(PresenterBaseViewController.backAction(_:)), for: .touchUpInside)

barButton.addSubview(self.backButton)
self.navigationItem.leftBarButtonItem = UIBarButtonItem(customView: barButton)

Answer 3

尝试

let addNewNoteButtonImage = UIImage(named: "feather")?.imageWithRenderingMode(.AlwaysOriginal)

addNewNoteButton.image = addNewNoteButtonImage
addNewNoteButton.contentMode = UIViewContentMode.ScaleAspectFit

Answer 4

如果你想在UIButton中设置UIImage的内容模式，你必须访问带有的按钮imageView：

button(UIImage(named: "feather"), forState: .Normal)
button?.contentMode = .ScaleAspectFit