Question

我开始搞乱UIProgessbar，然后我开始遇到问题而没有更新视图。

这是我的代码在视图中加载：

progressViewBorder = [[UIView alloc] initWithFrame:CGRectMake(0.0f,
                                                              cameraBarOverlay.frame.size.height + cameraBarOverlay.frame.origin.y,
                                                              self.view.frame.size.width,
                                                              10.0f)];

[progressViewBorder setBackgroundColor:[UIColor colorWithPatternImage:[UIImage imageNamed:@"progress_bg"]]];

progressView = [[UIProgressView alloc] init];
CGAffineTransform transform = CGAffineTransformMakeScale(1.0f, 5.0f);
progressView.transform = transform;
[progressView setFrame: CGRectMake(0.0f,5.0f,progressViewBorder.frame.size.width,1.0f)];
[progressView setProgressTintColor:[UIColor whiteColor]];
[progressView setUserInteractionEnabled:NO];
[progressView setProgress: 0.0f];
[progressView setProgressViewStyle:UIProgressViewStyleBar];
[progressView setTrackTintColor:[UIColor whiteColor]];
[progressViewBorder setHidden:YES];
[progressViewBorder addSubview:progressView];
[self.view addSubview:progressViewBorder];

这是我的更新代码：

- (void)startMovieRecording:(id)sender {
[[self recordButton] setEnabled:NO];
CMTime maxDuration = CMTimeMakeWithSeconds(15, 50);
[[self movieFileOutput] setMaxRecordedDuration:maxDuration];

dispatch_async([self sessionQueue], ^{
    if (![[self movieFileOutput] isRecording]) {

        [self setLockInterfaceRotation:YES];

        if ([[UIDevice currentDevice] isMultitaskingSupported]) {
            [self setBackgroundRecordingID:[[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:nil]];
        }

        // Update the orientation on the movie file output video connection before starting recording.
        [[[self movieFileOutput] connectionWithMediaType:AVMediaTypeVideo] setVideoOrientation:[[(AVCaptureVideoPreviewLayer *)[self previewLayer] connection] videoOrientation]];

        // Turning OFF flash for video recording
        [FTCamViewController setFlashMode:AVCaptureFlashModeOff forDevice:[[self videoDeviceInput] device]];
        [toggleFlash setImage:[UIImage imageNamed:[flashImages objectAtIndex:2]] forState:UIControlStateNormal];
        currentFlashMode = [flashImages objectAtIndex:2];

        // Start recording to a temporary file.
        NSString *outputFilePath = [NSTemporaryDirectory() stringByAppendingPathComponent:[@"movie" stringByAppendingPathExtension:@"mov"]];
        [[self movieFileOutput] startRecordingToOutputFileURL:[NSURL fileURLWithPath:outputFilePath] recordingDelegate:self];

        while ([[self movieFileOutput] isRecording]) {
            double duration = CMTimeGetSeconds([[self movieFileOutput] recordedDuration]);
            double time = CMTimeGetSeconds([[self movieFileOutput] maxRecordedDuration]);
            CGFloat progress = (CGFloat) (duration / time);

            dispatch_async(dispatch_get_main_queue(), ^{
                [progressView setProgress:progress animated:YES];
            });
        }

    } else {
        [[self movieFileOutput] stopRecording];
    }
});

}

有谁可以告诉为什么这不会更新？

Answer 1

嗯，这真的很糟糕，但事实证明我将色调颜色和进度色调设置为相同的颜色.. whiteColor。这导致显示器非常奇怪。

这就是为我解决的问题。

[self.progressView setProgressTintColor:[UIColor whiteColor]];
[self.progressView setUserInteractionEnabled:NO];
[self.progressView setProgressViewStyle:UIProgressViewStyleDefault];
[self.progressView setTrackTintColor:[UIColor clearColor]];

从四处寻找可能的解决方案，我将我的while循环更新为：

while ([[self movieFileOutput] isRecording]) {
            double duration = CMTimeGetSeconds([[self movieFileOutput] recordedDuration]);
            double time = CMTimeGetSeconds([[self movieFileOutput] maxRecordedDuration]);
            CGFloat progress = (CGFloat) (duration / time);

            [self performSelectorInBackground:@selector(updateProgress:) withObject:[NSNumber numberWithFloat:progress]];
}

我的选择器会进行更新。

- (void)updateProgress:(NSNumber *)progress {
    [self.progressView setProgress:[progress floatValue] animated:YES];
}

Answer 2

将您的while代码放在一个单独的方法中。使用

调用此方法

[self performSelectorOnBackgroundThread....]

添加一个方法来更新进度条，并通过

从while方法中获取此方法

[self performSelectorOnMainThread....]

克劳斯

IOS UIProgressView栏没有更新，谁能说出原因？

2 个答案: