![](/img/trans.png)
[英]how to programmatically, in Swift, set an uiimageview to the xcode built-in applewatch icon image?
[英]Programmatically set image to UIImageView with Xcode 6.1/Swift
我正在嘗試在Xcode 6.1中以編程方式設置UIImageView:
@IBOutlet weak var bgImage: UIImageView!
var image : UIImage = UIImage(named:"afternoon")!
bgImage = UIImageView(image: image)
bgImage.frame = CGRect(x: 0, y: 0, width: 100, height: 200)
view.addSubview(bgImage)
但Xcode用bgImage = UIImageView(image: image)
說“預期聲明”圖像"afternoon"
是一個PNG,我的理解是PNG不需要在XCode 6.1中擴展。
還嘗試了bgImage.image = UIImage(named: "afternoon")
,但仍然得到:
UPDATE
好的,我已經把代碼更新為UIImageView
到viewDidLoad
函數,但是UIImageView
仍然沒有顯示圖像(它存在於基本目錄中,如下午.png):
@IBOutlet weak var bgImage: UIImageView!
@IBOutlet weak var dateLabel: UILabel!
@IBOutlet weak var timeLabel: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
updateTime()
var timer = NSTimer()
let aSelector : Selector = "updateTime"
timer = NSTimer.scheduledTimerWithTimeInterval(0.01, target: self, selector: aSelector, userInfo: nil, repeats: true)
var image : UIImage = UIImage(named:"afternoon")!
bgImage = UIImageView(image: image)
}
由於您已將bgImage指定並鏈接為IBOutlet,因此無需將其初始化為UIImageView ...而是您需要做的就是設置圖像屬性,如bgImage.image = UIImage(named: "afternoon")
。 運行此代碼后,圖像顯示正常,因為它已使用插座分配。
但是,如果它不是一個插座,並且你沒有將它連接到storyboard / xib文件上的UIImageView對象,那么你可以這樣如下......
class ViewController: UIViewController {
var bgImage: UIImageView?
override func viewDidLoad() {
super.viewDidLoad()
var image: UIImage = UIImage(named: "afternoon")!
bgImage = UIImageView(image: image)
bgImage!.frame = CGRectMake(0,0,100,200)
self.view.addSubview(bgImage!)
}
}
好的,讓它使用它(以編程方式創建UIImageView):
var imageViewObject :UIImageView
imageViewObject = UIImageView(frame:CGRectMake(0, 0, 600, 600))
imageViewObject.image = UIImage(named:"afternoon")
self.view.addSubview(imageViewObject)
self.view.sendSubviewToBack(imageViewObject)
這個怎么樣;
myImageView.image=UIImage(named: "image_1")
其中image_1在assets文件夾中作為image_1。 png 。
這對我有用,因為我使用開關盒來顯示圖像幻燈片。
這段代碼在錯誤的地方:
var image : UIImage = UIImage(named:"afternoon")!
bgImage = UIImageView(image: image)
bgImage.frame = CGRect(x: 0, y: 0, width: 100, height: 200)
view.addSubview(bgImage)
您必須將其放在一個函數中。 我建議在viewDidLoad
函數中移動它。
通常,您可以在不在函數內部的類中添加的唯一代碼是變量聲明,如:
@IBOutlet weak var bgImage: UIImageView!
使用快速語法,這對我有用:
let leftImageView = UIImageView()
leftImageView.image = UIImage(named: "email")
let leftView = UIView()
leftView.addSubview(leftImageView)
leftView.frame = CGRect(x: 0, y: 0, width: 40, height: 40)
leftImageView.frame = CGRect(x: 10, y: 10, width: 20, height: 20)
userNameTextField.leftViewMode = .always
userNameTextField.leftView = leftView
在Swift 4中,如果圖像返回為零。
單擊右側的圖像(實用程序) - >檢查目標成員身份
如果你想按照你在問題中展示的方式做到這一點,這是一種內聯方式
class YourClass: UIViewController{
@IBOutlet weak var tableView: UITableView!
//other IBOutlets
//THIS is how you declare a UIImageView inline
let placeholderImage : UIImageView = {
let placeholderImage = UIImageView(image: UIImage(named: "nophoto"))
placeholderImage.contentMode = .scaleAspectFill
return placeholderImage
}()
var someVariable: String!
var someOtherVariable: Int!
func someMethod(){
//method code
}
//and so on
}
您只需要拖放ImageView
,創建插座操作,鏈接它並提供圖像(Xcode將在您的assets
文件夾中查找您提供的名稱(此處:“toronto”))
在yourProject/ViewController.swift
import UIKit
class ViewController: UIViewController {
@IBOutlet weak var imgView: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
imgView.image = UIImage(named: "toronto")
}
}
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.