我正在将一些工作 swift 代码转换为将 SceneView 渲染为 m4v 视频的 Objective-C,并且渲染处理方法有一个返回语句,该语句仅在满足条件时执行。
快速代码如下:
func renderScene() {
self.videoRenderer.delegate = self
var options = VideoRendererOptions()
options.sceneDuration = self.rotationDuration *
TimeInterval(self.totalRotations)
options.videoSize = CGSize(width: 1280, height: 720)
options.fps = 60
let startTime = Date()
self.videoRenderer.render(
scene: arView.scene,
withOptions: options,
until: {
print(self.rotations, self.totalRotations)
return self.rotations >= self.totalRotations
},
andThen: {
outputPath in
print(
String(format:"Finished render in time: %.2fs", startTime.timeIntervalSinceNow * -1)
)
PhotosUtil.saveVideo(atPath: outputPath)
let alert = UIAlertController(title: "Done", message: "A new video has been added to the Camera Roll", preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "OK", style: .default, handler: nil))
self.present(alert, animated: true)
}
)
}
此快速代码正在运行,并在满足直到条件时返回(self.rotations >= self.totalRotations)。
我的 Objective-C 代码反映了这段代码,但由于某种原因,直到中的部分没有被触发。在这种情况下,函数应该根据 until 块中的布尔值返回。
-(void)renderScene{
videoRenderer.delegate = self;
struct VideoRendererOptions options;
options.videoSize = CGSizeMake(1280, 720);
options.fps = 60;
NSDate *startTime = [NSDate date];
[videoRenderer render:_sceneView.scene withOptions:options until:^BOOL{
return !isRecording;
} andThen:^(NSString * outputPath) {
NSLog(@"%@", [NSString stringWithFormat:@"Finished render time in %.2fs", ([startTime timeIntervalSinceNow] * - 1)]);
[PhotoUtil saveVideoAtPath:outputPath];
[PSIAlertUtility showAlertTitle:@"Video Saved" message:@"Video has been added to your camera roll yo"];
}];}
我还有一个方法可以改变 isRecording 的值,并根据这个值调用渲染函数。如下:
-(void)recordPressed{
isRecording = !isRecording;
if (isRecording) {
[self renderScene];
}
}
将不胜感激任何帮助,我对最后一个括号格式感到抱歉,似乎无法正确处理。
谢谢