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我有一个简单的应用程序，它包含 2 个视图。顶视图有一个加速度计代表。当用户在屏幕上显示顶视图时摇晃时。然后调用 pushviewcontroller 并出现子视图。问题是当子视图出现时，我摇晃它，它仍然捕捉到摇晃动作并导致我出错。所以帮助我。提前致谢。

- (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration {
const float violence = 1.2;
static BOOL beenhere;
BOOL shake = FALSE;

if (beenhere) return;
beenhere = TRUE;

if (acceleration.x > violence || acceleration.x < (-1* violence))
    shake = TRUE;
if (acceleration.y > violence || acceleration.y < (-1* violence))
    shake = TRUE;
if (acceleration.z > violence || acceleration.z < (-1* violence))
    shake = TRUE;
if (shake) {
    [self playSound:@"suzu"];

    if ([[NSUserDefaults standardUserDefaults] boolForKey:@"noVib"] == NO) {
        AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);
    }
    [[UIAccelerometer sharedAccelerometer] setDelegate:nil];
    [self presentModalViewController:mMoviePlayer animated:YES];
    [self play]; 
}

当调用播放方法并且视频播放完毕时，将调用 pushviewcontroller 并出现子视图

下面是一个处理所有电影播放器​​内容的类。

- (void) initPlayer{
if (mMoviePlayer != nil){
    [mMoviePlayer release];
}

mMoviePlayer = [[MoviePlayerViewController alloc] initWithContentURL:[self createURL]];
[[NSNotificationCenter defaultCenter] removeObserver:mMoviePlayer 
                                                name:MPMoviePlayerPlaybackDidFinishNotification object:mMoviePlayer.moviePlayer];
[mMoviePlayer.moviePlayer setShouldAutoplay:NO];
mMoviePlayer.moviePlayer.backgroundView.backgroundColor = [UIColor blackColor];
mMoviePlayer.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
mMoviePlayer.moviePlayer.controlStyle = MPMovieControlStyleNone;

[[NSNotificationCenter defaultCenter] addObserver:self 
                                         selector:@selector(moviePlayBackDidFinish:) 
                                             name:MPMoviePlayerPlaybackDidFinishNotification 
                                           object:mMoviePlayer.moviePlayer];

[[NSNotificationCenter defaultCenter] addObserver:self 
                                         selector:@selector(moviePreloadDidFinish:) 
                                             name:MPMoviePlayerLoadStateDidChangeNotification 
                                           object:mMoviePlayer.moviePlayer];

- (void) moviePlayBackDidFinish:(NSNotification*)notification

{

[[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:NO];        
[[NSNotificationCenter defaultCenter] removeObserver:self
                                                name:MPMoviePlayerPlaybackDidFinishNotification
                                              object:mMoviePlayer.moviePlayer];
[self dismissModalViewControllerAnimated:YES];
[mMoviePlayer release];
mMoviePlayer = nil;
[self toNext];

}

4

1 回答 1

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我首先想到的是跟踪 mMoviePlayer 是否被推送。

if (shake && mPlayerPushed) {
    [self playSound:@"suzu"];

    if ([[NSUserDefaults standardUserDefaults] boolForKey:@"noVib"] == NO) {
        AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);
    }
    [[UIAccelerometer sharedAccelerometer] setDelegate:nil];
    [self presentModalViewController:mMoviePlayer animated:YES];
    [self play]; 
    mPlayerPushed = YES;
}

在调用dismissModalViewControllerAnimated:YES 之后的moviePlayBackDidFinish 方法中，您应该将mPlayerPushed 设置为NO。

或者您可以使用属性模态视图控制器来查看是否显示模态视图。这我还没有测试过，但它应该可以工作。

modalViewController：活动模态视图的控制器——即临时显示在接收者管理的视图之上的视图。（只读）

@property(nonatomic, readonly) UIViewController *modalViewController

因此，您将拥有的不是 bool mPlayerPushed：

if(shake && something.modalviewController == nil){ present mMoviePlayer }
于 2012-07-24T06:13:22.707 回答