Ios 如何将图像添加到UIImageView?
我正试图将图像添加到Ios 如何将图像添加到UIImageView?,ios,swift,uiimageview,core-graphics,Ios,Swift,Uiimageview,Core Graphics,我正试图将图像添加到UIImageView,但在添加之后UIImageView为零。这是我的密码: class ViewController: UIViewController { @IBOutlet var myView: UIView! @IBOutlet weak var testImg: UIImageView! override func viewDidLoad() { super.viewDidLoad() UIGra
UIImageView
,但在添加之后UIImageView
为零。这是我的密码:
class ViewController: UIViewController {
@IBOutlet var myView: UIView!
@IBOutlet weak var testImg: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
UIGraphicsBeginImageContext(CGSize(width: 500,height: 500))
var path = UIBezierPath()
path.lineWidth = 1.0
path.moveToPoint(CGPoint(x: 150, y: 150))
var x = 151
for ;x<300;x++
{
path.addLineToPoint(CGPoint(x: x, y: x))
path.moveToPoint(CGPoint(x: x, y: x))
}
path.stroke()
let img = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
testImg = UIImageView(image: img)
testImg.frame = CGRect(x: 0,y: 0,width: 500,height: 500)
myView.addSubview(testImg)
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
这一行代码覆盖了UIImageView
的IBOutlet
,删除它并简单地执行操作
testImg.image=img
修复问题。简单方法:将该图像拖放到Xcode上的文件视图/项目导航器 选择图像视图-然后选择属性inspect-在图像下-选择要加载的图像的文件名 尽可能享受拖拉和下降 硬道:
if let filePath = Bundle.main.path(forResource: "imageName", ofType: "jpg"), let image = UIImage(contentsOfFile: filePath) { imageView.contentMode = .scaleAspectFit
imageView.image = image
}
错误应该与推送或显示
ViewController
的方式有关。当您展示或演示时,似乎尚未创建插座。应使用以下示例中的instantialeviewcontrollerwhiteIdentifier
let viewController = self.storyboard?.instantiateViewControllerWithIdentifier("YourStoryBoardId")
self.navigationController?.pushViewController(viewController!, animated: true)
简单地说:
if let image = img {
// you don't have to instantiate an imageView again, IBOutlet handles it for you
testImg.image = image
print("Works")
// if you don't see this output in your debug console, the condition never succeeds and an img is really nil
}
你连接插座了吗?是的,两个插座都是连接的。情节提要ViewController类是在identity inspector中设置的吗?是的,它是设置的。我没有文件,我正在通过UIBezierPath创建图像。你的意思是我无法通过代码创建图像并将其添加到UIImageView?抱歉,我想说的是在这方面无能为力。是不是一样的
testImg=UIImageView(image:img)
添加了if块,设置图像属性时出现了相同的错误bytestImg=UIImageView(image:img)
您正在用新的UIImageView从头开始重写您原来的IBOutlet。我的回答对您有帮助吗?:)是的,非常感谢)我很久以前就把它标记为答案)我只有一个视图,在super.viewDidLoad()之后添加了这两个字符串,没有任何更改。我认为这是UIImageView的问题
if let image = img {
// you don't have to instantiate an imageView again, IBOutlet handles it for you
testImg.image = image
print("Works")
// if you don't see this output in your debug console, the condition never succeeds and an img is really nil
}