[英]How to set a background image in Xcode using swift?
How can I set a background image for my main view controller in Xcode 6 using swift?如何使用 swift 在 Xcode 6 中为我的主视图控制器设置背景图像? I know that you can do this in the assistant editor as below:
我知道您可以在助理编辑器中执行此操作,如下所示:
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = UIColor.yellowColor()
}
What is the code to set the background to an image I have in my assets folder?将背景设置为我的资产文件夹中的图像的代码是什么?
override func viewDidLoad() {
super.viewDidLoad()
self.view.backgroundColor = UIColor(patternImage: UIImage(named: "background.png"))
}
I am beginner to iOS development so I would like to share whole info I got in this section.我是 iOS 开发的初学者,所以我想分享我在本节中获得的全部信息。
First from image assets (images.xcassets) create image set .首先从图像资产(images.xcassets)创建图像集。
According to Documentation here is all sizes need to create background image.根据此处的文档,所有尺寸都需要创建背景图像。
For iPhone 5:
640 x 1136
For iPhone 6:
750 x 1334 (@2x) for portrait
1334 x 750 (@2x) for landscape
For iPhone 6 Plus:
1242 x 2208 (@3x) for portrait
2208 x 1242 (@3x) for landscape
iPhone 4s (@2x)
640 x 960
iPad and iPad mini (@2x)
1536 x 2048 (portrait)
2048 x 1536 (landscape)
iPad 2 and iPad mini (@1x)
768 x 1024 (portrait)
1024 x 768 (landscape)
iPad Pro (@2x)
2048 x 2732 (portrait)
2732 x 2048 (landscape)
call the image background we can call image from image assets by using this method UIImage(named: "background")
here is full code example调用图像背景我们可以使用此方法从图像资产调用图像
UIImage(named: "background")
这里是完整的代码示例
override func viewDidLoad() {
super.viewDidLoad()
assignbackground()
// Do any additional setup after loading the view.
}
func assignbackground(){
let background = UIImage(named: "background")
var imageView : UIImageView!
imageView = UIImageView(frame: view.bounds)
imageView.contentMode = UIViewContentMode.ScaleAspectFill
imageView.clipsToBounds = true
imageView.image = background
imageView.center = view.center
view.addSubview(imageView)
self.view.sendSubviewToBack(imageView)
}
override func viewDidLoad() {
let backgroundImage = UIImageView(frame: UIScreen.main.bounds)
backgroundImage.image = UIImage(named: "bg_image")
backgroundImage.contentMode = UIViewContentMode.scaleAspectfill
self.view.insertSubview(backgroundImage, at: 0)
}
Updated at 20-May-2020: 2020 年 5 月 20 日更新:
The code snippet above doesn't work well after rotating the device.旋转设备后,上面的代码片段无法正常工作。 Here is the solution which can make the image stretch according to the screen size(after rotating):
这是可以根据屏幕尺寸(旋转后)使图像拉伸的解决方案:
class ViewController: UIViewController {
var imageView: UIImageView = {
let imageView = UIImageView(frame: .zero)
imageView.image = UIImage(named: "bg_image")
imageView.contentMode = .scaleToFill
imageView.translatesAutoresizingMaskIntoConstraints = false
return imageView
}()
override func viewDidLoad() {
super.viewDidLoad()
view.insertSubview(imageView, at: 0)
NSLayoutConstraint.activate([
imageView.topAnchor.constraint(equalTo: view.topAnchor),
imageView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
imageView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
imageView.bottomAnchor.constraint(equalTo: view.bottomAnchor)
])
}
}
快速 4
view.layer.contents = #imageLiteral(resourceName: "webbg").cgImage
You can try this as well, which is really a combination of previous answers from other posters here :您也可以尝试此操作,这实际上是此处其他海报的先前答案的组合:
let backgroundImage = UIImageView(frame: UIScreen.main.bounds)
backgroundImage.image = UIImage(named: "RubberMat")
backgroundImage.contentMode = UIViewContentMode.scaleAspectFill
self.view.insertSubview(backgroundImage, at: 0)
For Swift 4对于 Swift 4
let backgroundImage = UIImageView(frame: UIScreen.main.bounds)
backgroundImage.image = UIImage(named: "bg_name.png")
backgroundImage.contentMode = UIViewContentMode.scaleAspectFill
self.view.insertSubview(backgroundImage, at: 0)
Background Image from API in swift 4 (with Kingfisher ) :来自 swift 4 中API 的背景图像(使用Kingfisher ):
import UIKit
import Kingfisher
extension UIView {
func addBackgroundImage(imgUrl: String, placeHolder: String){
let backgroundImage = UIImageView(frame: self.bounds)
backgroundImage.kf.setImage(with: URL(string: imgUrl), placeholder: UIImage(named: placeHolder))
backgroundImage.contentMode = UIViewContentMode.scaleAspectFill
self.insertSubview(backgroundImage, at: 0)
}
}
Usage:用法:
someview.addBackgroundImage(imgUrl: "yourImgUrl", placeHolder: "placeHolderName")
SWIFT 5 for TableViewController TableViewController 的 SWIFT 5
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(true)
tableView.backgroundView = UIImageView(image:"image.jpg")
tableView.backgroundView?.contentMode = .scaleToFill
}
Swift 5.3 in XCode 12.2 Playgrounds XCode 12.2 Playgrounds 中的 Swift 5.3
Place the cursor wherever in the code the #insertLiteral
would have been in earlier versions.将光标放在代码中
#insertLiteral
在早期版本中的任何位置。 Select from the top-menu Editor->Insert Image Literal...
and navigate to the file.从顶部菜单
Editor->Insert Image Literal...
并导航到该文件。 Click Open
.点击
Open
。
The file is added to a playground Resource folder and will then appear when the playground is run in whichever view it was positioned when selected.该文件被添加到一个Playground Resource 文件夹中,然后当 Playground 在它被选中时所在的任何视图中运行时就会出现。
If a file is already in the playground Bundle, eg in /Resources, it can be dragged directly to the required position in the code (where it will be represented by an icon).如果某个文件已经在 Playground Bundle 中,例如在 /Resources 中,则可以将其直接拖动到代码中所需的位置(它将用图标表示的位置)。
cf.参见Apple help docs give details of this and how to place other colour and file literals.
Apple 帮助文档提供了详细信息以及如何放置其他颜色和文件文字。
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