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在导航栏中居中显示图像

jsqmessagesviewcontroller xcode swift ios

0

Hews · 技术社区 · 7 年前

我打电话给 JSQMessageViewController 并添加一个图像作为标题,但由于 Back 左按钮。

let imageView = UIImageView()
    imageView.frame.size.width = 40
    imageView.frame.size.height = 40
    imageView.contentMode = .scaleAspectFit
    let image = UIImage(named: "avatar_example")
    imageView.image = image
    navigationItem.titleView = imageView

谢谢:)

2 回复 | 直到 7 年前

1

2

Anton Rodzik 7 年前

您确定问题出在JSQMessageViewController中吗?也许您只需要使用标题视图中的标准尺寸(44*44)进行对齐。

    let imageView = UIImageView(image: UIImage(named: "avatar_example"))
    imageView.contentMode = .scaleAspectFit
    let titleView = UIView(frame: CGRect(x: 0, y: 0, width: 44, height: 44))
    imageView.frame = titleView.bounds
    titleView.addSubview(imageView)

    self.navigationItem.titleView = titleView

2

0

Dani iman kazemayni 7 年前

你需要实际得到物体的宽度和高度 UINavigationBar 并相应地将图像居中。试试这个

    guard let bar = navigationController.navigationBar else { return }
    let bannerWidth = bar.frame.size.width
    let bannerHeight = bar.frame.size.height

    // centers image vertically & horizontally
    let bannerX = bannerWidth / 2 - imageView.frame.width / 2
    let bannerY = bannerHeight / 2 - imageView.frame.height / 2

    imageView.frame = CGRect(x: bannerX, y: bannerY, width: bannerWidth, height: bannerHeight)
    imageView.contentMode = .scaleAspectFit

    navigationItem.titleView = logoImageView