一个关于Media Player 跨iPhone版本的问题

最新推荐文章于 2021-12-24 11:06:21 发布

最新推荐文章于 2021-12-24 11:06:21 发布 · 72 阅读

本文探讨了iOS应用中使用MediaPlayer框架时遇到的兼容性问题，特别是针对iOS 4和iOS 3的不同版本。文章提供了一种通过条件判断来区分iOS版本，并据此选择不同实现方式的方法，以确保应用在不同iOS版本上都能正常运行。

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A problem with Media Player base on iOS4 and deploy iOS3

from： http://stackoverflow.com/questions/3092117/a-problem-with-media-player-base-on-ios4-and-deploy-ios3
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when Run on Device 3.1.2, why it also pass if(NSClassFromString(@"MPMoviePlayerViewController") != nil) and do code of iOS4 then it will crash , how to fix this issues?
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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];

}

1 Answer
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- (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];

}

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