Swift - 如何按文本长度设置自定义视图
Swift - How to set custom view by text length
这是我的代码,
func bannerNotification(text: String){
let container = UIView()
let image = UIImageView()
let label = UILabel()
container.frame = CGRect(x: 0, y:0, width: self.view.frame.size.width, height: 100)
container.backgroundColor = .blue
image.frame = CGRect(x: 15, y: 50, width: 30, height: 30)
image.image = UIImage(named: "passport")
label.frame = CGRect(x: image.bounds.maxX + 35, y: 50, width: container.frame.size.width - 100, height: 50)
label.backgroundColor = .red
label.numberOfLines = 0
label.font = UIFont(name:"Helvetica Neue", size: 15)
label.text = text
container.addSubview(image)
container.addSubview(label)
self.view.addSubview(container)
}
根据此代码,容器和图像位于正确的位置,但如果我传递小文本,那么我的文本不会与图像内联,这意味着 我的图像顶部位置和文本顶部位置应该相同.
如果我要传递一个大文本,那么 容器底部和标签底部应该相同 并且所有文本都应该没有被截断并且 图像和标签应该是从顶部开始内联.
您真的想为此使用 auto-layout,特别是因为您使用的是 multi-line 标签 -- 也就是说,它的高度会有所不同。
这是一个示例 - 通读注释以了解 auto-layout 约束:
class KingViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
bannerNotification(text: "Banner Test")
//bannerNotification(text: "Banner Test with lots of text to wrap onto multiple lines. Of the many advantages with using auto-layout, notice that the banner will stretch when you rotate the device.")
}
func bannerNotification(text: String){
let container = UIView()
let image = UIImageView()
let label = UILabel()
container.addSubview(image)
container.addSubview(label)
self.view.addSubview(container)
[image, label, container].forEach {
[=10=].translatesAutoresizingMaskIntoConstraints = false
}
container.backgroundColor = UIColor(red: 0.0, green: 0.5, blue: 1.0, alpha: 1.0)
//image.image = UIImage(named: "passport")
image.image = UIImage(named: "swiftRed")
label.backgroundColor = .yellow
label.numberOfLines = 0
label.font = UIFont(name:"Helvetica Neue", size: 15)
label.text = text
// respect the safe area
let g = view.safeAreaLayoutGuide
NSLayoutConstraint.activate([
// constrain container Top / Leading / Trailing
container.topAnchor.constraint(equalTo: view.topAnchor),
container.leadingAnchor.constraint(equalTo: view.leadingAnchor),
container.trailingAnchor.constraint(equalTo: view.trailingAnchor),
// we'll use the label height to determine the container height
// image view Top = 8 / Leading = 15
image.topAnchor.constraint(equalTo: g.topAnchor, constant: 8.0),
image.leadingAnchor.constraint(equalTo: g.leadingAnchor, constant: 15.0),
// image view width = 30 / height == width (1:1 ratio)
image.widthAnchor.constraint(equalToConstant: 30.0),
image.heightAnchor.constraint(equalTo: image.widthAnchor),
// label Top aligned to Top of image view
label.topAnchor.constraint(equalTo: image.topAnchor),
// label Leading == image view Trailing + 20
label.leadingAnchor.constraint(equalTo: image.trailingAnchor, constant: 20.0),
// label Trailing = container Trailing - 15
label.trailingAnchor.constraint(equalTo: g.trailingAnchor, constant: -15.0),
// container bottom should be
// At Least 8-pts below the image view bottom
// AND
// At Least 8-pts below the label bottom
container.bottomAnchor.constraint(greaterThanOrEqualTo: image.bottomAnchor, constant: 8.0),
container.bottomAnchor.constraint(greaterThanOrEqualTo: label.bottomAnchor, constant: 8.0),
])
}
}
结果,短文本:
长文本结果:
请注意,它 auto-adjusts 当尺寸发生变化时 - 例如随着设备旋转:
这是我的代码,
func bannerNotification(text: String){
let container = UIView()
let image = UIImageView()
let label = UILabel()
container.frame = CGRect(x: 0, y:0, width: self.view.frame.size.width, height: 100)
container.backgroundColor = .blue
image.frame = CGRect(x: 15, y: 50, width: 30, height: 30)
image.image = UIImage(named: "passport")
label.frame = CGRect(x: image.bounds.maxX + 35, y: 50, width: container.frame.size.width - 100, height: 50)
label.backgroundColor = .red
label.numberOfLines = 0
label.font = UIFont(name:"Helvetica Neue", size: 15)
label.text = text
container.addSubview(image)
container.addSubview(label)
self.view.addSubview(container)
}
根据此代码,容器和图像位于正确的位置,但如果我传递小文本,那么我的文本不会与图像内联,这意味着 我的图像顶部位置和文本顶部位置应该相同.
如果我要传递一个大文本,那么 容器底部和标签底部应该相同 并且所有文本都应该没有被截断并且 图像和标签应该是从顶部开始内联.
您真的想为此使用 auto-layout,特别是因为您使用的是 multi-line 标签 -- 也就是说,它的高度会有所不同。
这是一个示例 - 通读注释以了解 auto-layout 约束:
class KingViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
bannerNotification(text: "Banner Test")
//bannerNotification(text: "Banner Test with lots of text to wrap onto multiple lines. Of the many advantages with using auto-layout, notice that the banner will stretch when you rotate the device.")
}
func bannerNotification(text: String){
let container = UIView()
let image = UIImageView()
let label = UILabel()
container.addSubview(image)
container.addSubview(label)
self.view.addSubview(container)
[image, label, container].forEach {
[=10=].translatesAutoresizingMaskIntoConstraints = false
}
container.backgroundColor = UIColor(red: 0.0, green: 0.5, blue: 1.0, alpha: 1.0)
//image.image = UIImage(named: "passport")
image.image = UIImage(named: "swiftRed")
label.backgroundColor = .yellow
label.numberOfLines = 0
label.font = UIFont(name:"Helvetica Neue", size: 15)
label.text = text
// respect the safe area
let g = view.safeAreaLayoutGuide
NSLayoutConstraint.activate([
// constrain container Top / Leading / Trailing
container.topAnchor.constraint(equalTo: view.topAnchor),
container.leadingAnchor.constraint(equalTo: view.leadingAnchor),
container.trailingAnchor.constraint(equalTo: view.trailingAnchor),
// we'll use the label height to determine the container height
// image view Top = 8 / Leading = 15
image.topAnchor.constraint(equalTo: g.topAnchor, constant: 8.0),
image.leadingAnchor.constraint(equalTo: g.leadingAnchor, constant: 15.0),
// image view width = 30 / height == width (1:1 ratio)
image.widthAnchor.constraint(equalToConstant: 30.0),
image.heightAnchor.constraint(equalTo: image.widthAnchor),
// label Top aligned to Top of image view
label.topAnchor.constraint(equalTo: image.topAnchor),
// label Leading == image view Trailing + 20
label.leadingAnchor.constraint(equalTo: image.trailingAnchor, constant: 20.0),
// label Trailing = container Trailing - 15
label.trailingAnchor.constraint(equalTo: g.trailingAnchor, constant: -15.0),
// container bottom should be
// At Least 8-pts below the image view bottom
// AND
// At Least 8-pts below the label bottom
container.bottomAnchor.constraint(greaterThanOrEqualTo: image.bottomAnchor, constant: 8.0),
container.bottomAnchor.constraint(greaterThanOrEqualTo: label.bottomAnchor, constant: 8.0),
])
}
}
结果,短文本:
长文本结果:
请注意,它 auto-adjusts 当尺寸发生变化时 - 例如随着设备旋转: