尝试以编程方式设置按钮的图像时,我收到“nil”错误.我究竟做错了什么？这些都不是可选项.
@IBOutlet weak var scrollView: UIScrollView!
var imageButton: UIButton!
var index: Int = 0
var images: [UIImage] = [UIImage(named: "image1.png")!,UIImage(named: "image2.png")!,UIImage(named: "image3.png")!,UIImage(named: "image4.png")!,UIImage(named: "image5.png")!,UIImage(named: "image6.png")!,UIImage(named: "image7.png")!,UIImage(named: "image8.png")!,UIImage(named: "image9.png")!,UIImage(named: "image10.png")!,UIImage(named: "image11.png")!,UIImage(named: "image12.png")!,UIImage(named: "image13.png")!,UIImage(named: "image14.png")!,UIImage(named: "image15.png")!,UIImage(named: "image16.png")!,UIImage(named: "image17.png")!,UIImage(named: "image18.png")!,UIImage(named: "image19.png")!,UIImage(named: "image20.png")!,UIImage(named: "image21.png")!,UIImage(named: "image22.png")!,UIImage(named: "image23.png")!,UIImage(named: "image24.png")!,UIImage(named: "image25.png")!,UIImage(named: "image26.png")!,UIImage(named: "image27.png")!,UIImage(named: "image28.png")!,UIImage(named: "image29.png")!,UIImage(named: "image30.png")!]
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view,typically from a nib.
let screenSize: CGRect = UIScreen.mainScreen().bounds
let screenWidth = screenSize.width
//let screenHeight = screenSize.height
let numWidth: CGFloat = 3
let numHeight: CGFloat = 10
self.scrollView.frame.size.width = screenWidth
let width: CGFloat = (self.scrollView.frame.size.width - (numWidth + 1))/3
for var i:CGFloat = 0; i < 3; ++i{
for var j:CGFloat = 0; j < 10; ++j {
let image: UIImage = images[index] as UIImage!
imageButton.setImage(image,forState:UIControlState.Normal)
imageButton.frame = CGRectMake(width*i,width*j,width,width)
self.scrollView.addSubview(imageButton)
index++
}
}
scrollView.contentSize.height = (width)*numHeight
解决方法
我想你是再次从Image创建Image.
就这样吧
imageButton.setImage(images[index],forState:UIControlState.Normal)
希望它会奏效.
或者你可以这样做：
var images = [String]?
在viewDidLoad中
images = ["image1.png","image2.png"] let img : UIImage = UIImage(named: images[index])! imageButton = UIButton.buttonWithType(UIButtonType.System) as UIButton button.frame = CGRectMake(100,100,100)//Set your own frame imageButton.setImage(img,forState:UIControlState.Normal)
并检查它必须在您的项目中可用的图像
