我正在尝试使用GLKView将图像放入UITableViewCell来绘制图像。
我在故事板中有一个原型单元格,我有一个GLKView。它没有选中Enable setNeedsDisplay。
原型单元格有一个名为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")
}
}
这用于UITableViewController
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,我得到以下日志语句
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空白?我确信有一个图像,glkView在正确的位置(我已经使用Xcode中的预览工具进行了检查)
为什么要调用draw(rect :)而不是glkView(view:GLKView,drawIn rect:CGRect)?
我在运行iOS 9.3的iPhone 5上使用Xcode 8,swift 3,任何帮助都非常感谢
答案 0 :(得分:1)
我不确定Xcode是否会以某种方式自动处理这个问题,或者默认情况下是否激活了上下文,但是在我迄今为止我唯一的OpenGL项目中,我不得不使用:
[EAGLContext setCurrentContext:ciContext];
每当我需要我的上下文激活时。