当在设备3.1.2上运行时,为什么它也传递 if(NSClassFromString(@"MPMoviePlayerViewController") != nil) 做iOS4的代码就会崩溃,如何解决这个问题?
if(NSClassFromString(@"MPMoviePlayerViewController") != nil) {
// iOS 4 code
NSLog(@"MPMoviePlayerViewController");
MPMoviePlayerViewController *mp = [[MPMoviePlayerViewController alloc] initWithContentURL:[NSURL URLWithString:AppDelegate.PushLink]];
if (mp) {
// save the movie player object
self.theMovie4 = mp;
[mp release];
//Present
[self presentMoviePlayerViewControllerAnimated:self.theMovie4];
// Play the movie!
self.theMovie4.moviePlayer.movieSourceType = MPMovieSourceTypeStreaming;
[self.theMovie4.moviePlayer play];
}
}
else {
//iOS 3 Code
AppDelegate = nil;
AppDelegate = [[UIApplication sharedApplication] delegate];
[AppDelegate ForceHideNavigationBar];
theMovie3 = nil;
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(moviePreloadDidFinish:)
name:MPMoviePlayerContentPreloadDidFinishNotification
object:theMovie3];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(moviePlayBackDidFinish:)
name:MPMoviePlayerPlaybackDidFinishNotification
object:theMovie3];
// Register to receive a notification when the movie scaling mode has changed.
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(movieScalingModeDidChange:)
name:MPMoviePlayerScalingModeDidChangeNotification
object:theMovie3];
theMovie3 = [[MPMoviePlayerController alloc] initWithContentURL: [NSURL URLWithString:AppDelegate.PushLink]];
[theMovie3 play];
}
最佳答案
我在我的应用程序上做了非常类似的事情,它使用 4.0 作为基础 SDK,但我也针对 iOS3 设备。我必须检查操作系统版本才能正确提供视频播放的正确代码。例如:
- (void) playMovieAtURL: (NSURL*) theURL {
NSLog(@"playMovieAtURL");
if ([[[UIDevice currentDevice] systemVersion] doubleValue] >= 3.2) {
NSLog(@"> 3.2");
MPMoviePlayerViewController *mp = [[MPMoviePlayerViewController alloc] initWithContentURL:theURL];
if (mp)
{
// save the movie player object
//self.moviePlayerViewController = mp;
//[mp release];
[self presentMoviePlayerViewControllerAnimated:mp];
mp.moviePlayer.movieSourceType = MPMovieSourceTypeFile;
[mp.moviePlayer play];
[mp release];
}
}
else if ([[[UIDevice currentDevice] systemVersion] doubleValue] < 3.2) {
NSLog(@"< 3.2");
MPMoviePlayerController* theMovie = [[MPMoviePlayerController alloc] initWithContentURL: theURL];
theMovie.scalingMode = MPMovieScalingModeAspectFill;
// Register for the playback finished notification
[[NSNotificationCenter defaultCenter]
addObserver: self
selector: @selector(myMovieFinishedCallback:)
name: MPMoviePlayerPlaybackDidFinishNotification
object: theMovie];
// Movie playback is asynchronous, so this method returns immediately.
[theMovie play];
}
}
希望这有帮助!!
关于iphone - 基于iOS 4并部署iOS 3的媒体播放器问题,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/3092117/