我正在尝试使用GLKView将图像放入UITableViewCell中进行绘制。
在故事板中,我有一个原型单元格,其中包含一个GLKView。它没有启用setNeedsDisplay选项。
原型单元格具有名为PhotoTableViewCell的自定义类。
import UIKit
import GLKit
class PhotoTableViewCell: UITableViewCell {
var eaglContext:EAGLContext!
var ciContext:CIContext!
var myImage:CIImage!
@IBOutlet weak var photoGlView: GLKView!
@IBOutlet weak var timeLabel: UILabel!
@IBOutlet weak var cameraLabel: UILabel!
@IBOutlet weak var notesLabel: UILabel!
override func layoutSubviews() {
self.photoGlView.delegate = self
}
}
extension PhotoTableViewCell: GLKViewDelegate {
override func draw(_ rect: CGRect) {
let drawableRectSize = CGSize(width: 200, height: 200)// width: photoGlView.drawableWidth, height: photoGlView.drawableHeight)
let drawableRect = CGRect(origin: CGPoint.zero, size: drawableRectSize)
print("rect ->\(drawableRect)")
print("rect size -> \(drawableRectSize)")
ciContext.draw(myImage, in: drawableRect, from: myImage.extent)
print("drawing rect my image =\(photoGlView)")
}
func glkView(_ view: GLKView, drawIn rect: CGRect) {
let drawableRectSize = CGSize(width: view.drawableWidth, height: view.drawableHeight)
let drawableRect = CGRect(origin: CGPoint.zero, size: drawableRectSize)
ciContext.draw(myImage, in: drawableRect, from: myImage.extent)
print("drawing")
}
}
这是在UITableViewController中使用的。
class PhotosTableViewController: UITableViewController {
var cameraId:Int = 1
var photos:[Photo] = []
var eaglContext:EAGLContext!
var ciContext:CIContext!
override func viewDidLoad() {
super.viewDidLoad()
self.eaglContext = EAGLContext(api: .openGLES2)
self.ciContext = CIContext(eaglContext: eaglContext!)
}
....
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "photoCell") as! PhotoTableViewCell
let photo = photos[indexPath.row]
if let image = photo.getLightImage() {
cell.ciContext = ciContext
cell.eaglContext = eaglContext
cell.myImage = image
cell.photoGlView.display()
}
cell.cameraLabel.text = AppService.shared.getCameraName(id: photo.cameraId)
cell.timeLabel.text = "Taken: \(photo.uploaded?.niceTime() ?? "")"
return cell
}
当我导航到 TableView 时,我会得到以下日志记录。
rect ->(0.0, 0.0, 200.0, 200.0)
rect size -> (200.0, 200.0)
drawing rect my image =Optional(<GLKView: 0x1560bed0; frame = (0 0; 191 253); clipsToBounds = YES; opaque = NO; autoresize = RM+BM; tintColor = UIDeviceRGBColorSpace 0 0 0 1; layer = <CAEAGLLayer: 0x1560e530>>)
rect ->(0.0, 0.0, 200.0, 200.0)
rect size -> (200.0, 200.0)
drawing rect my image =Optional(<GLKView: 0x156044f0; frame = (0 0; 191 253); clipsToBounds = YES; opaque = NO; autoresize = RM+BM; tintColor = UIDeviceRGBColorSpace 0 0 0 1; layer = <CAEAGLLayer: 0x15604610>>)
我的问题是为什么视图是空白的?我确信有图片,并且glkView在正确的位置(我已经使用Xcode预览工具进行检查)。
为什么调用的是draw(rect:)而不是glkView(view:GLKView, drawIn rect:CGRect)?
我正在使用Xcode 8,Swift 3,在运行iOS 9.3的iPhone 5上,非常感谢任何帮助。