应用程序因内核恐慌而死机和崩溃 -

Question

我有一个应用程序，它显示一些由播放 MIDI 文件触发的基本动画。它在第一次播放期间工作正常，但在后续播放期间冻结。然后设备通常会重新启动，生成一个崩溃日志，表明发生了内核恐慌。有时它只是挂起而不重新启动。

动画由一个小的 png 图像组成，它的不透明度从高到低变化以产生淡化效果。

冻结发生在线：[self performSelectorOnMainThread:@selector( setPitch: ) withObject:[NSNumber numberWithInteger:[note intValue]] waitUntilDone:YES];

这是包含这一行的方法：

- (void)log:(NSNotification *)notification {

[NSThread isMainThread];

NSDictionary* info = notification.userInfo;


NSNumber *note;
note = [info objectForKey:kNAMIDI_Note];

BRMidiNoteName *noteConverter = [[BRMidiNoteName alloc] init];

NSString *noteName;
noteName = [noteConverter nameFromNumber:[note intValue] withNotation:[defaults valueForKey:kSettingsNotation]];


[self.currentNoteLabel performSelectorOnMainThread: @selector( setText: ) withObject: noteName waitUntilDone: YES];
[self performSelectorOnMainThread:@selector( setPitch: ) withObject:[NSNumber numberWithInteger:[note intValue]] waitUntilDone:YES];

}


-(void) setPitch:(NSNumber*) pitchValue{

NSInteger visualPitchValue = [pitchValue intValue]- [_currentTrack.trackStartNote intValue] - voiceTransposeValue + 1;

if ([defaults boolForKey:kSettingsVisualiser]) {
    //UIImageView *img = [[UIImageView alloc]init];
    UIImageView *img; 

    if ((visualPitchValue > 0 )) {

        // highlight new pitch
        img = (UIImageView *)[self.view viewWithTag:visualPitchValue];

        if (([pitchValue integerValue] < [currentVoice.bridgeLow integerValue])) {
            [img setImage:[UIImage imageNamed:@"bar_green.png"]];
        }
        else if (([pitchValue integerValue] <= [currentVoice.bridgeHigh integerValue])) {
            [img setImage:[UIImage imageNamed:@"bar_orange"]];
        }
        else{
            [img setImage:[UIImage imageNamed:@"bar_blue.png"]];
        }
        [img setAlpha:1.0];


        // Set up fade out effect
        CABasicAnimation *fadeOutAnimation = [CABasicAnimation animationWithKeyPath:@"opacity"];
        [fadeOutAnimation setToValue:[NSNumber numberWithFloat:_fadeToOpacity]];
        fadeOutAnimation.fillMode = kCAFillModeForwards;
        fadeOutAnimation.removedOnCompletion = NO;

        CAAnimationGroup *group = [CAAnimationGroup animation];
        group.fillMode = kCAFillModeForwards;
        group.removedOnCompletion = NO;
        // [group setAnimations:[NSArray arrayWithObjects:fadeOutAnimation, pathAnimation, nil]];
        [group setAnimations:[NSArray arrayWithObjects:fadeOutAnimation, nil]];
        group.duration = 0.7f;
        group.delegate = self;
        [group setValue:img forKey:@"imageViewBeingAnimated"];

        [img.layer addAnimation:group forKey:@"savingAnimation"];

    }
}
}

Answer 1

我发现将 waitUntilDone 从 YES 更改为 NO 会阻止设备屏幕冻结。

[self.currentNoteLabel performSelectorOnMainThread: @selector( setText: ) withObject: noteName waitUntilDone: NO];
[self performSelectorOnMainThread:@selector( setPitch: ) withObject:[NSNumber numberWithInteger:[note intValue]] waitUntilDone:NO];