iPhone 上的录像机
这是我制作的程序。 但我跑得不好。当我在 iPhone 上打开这个程序时，它立即关闭。 我将展示我的代码并回答我有什么问题。
UIImagePickerController * videoRecorder = [[[UIImagePickerController alloc] init] autorelease];
videoRecorder.delegate = self;
videoRecorder.sourceType = UIImagePickerControllerSourceTypeCamera;
NSArray *sourceTypes = [UIImagePickerController availableMediaTypesForSourceType:videoRecorder.sourceType];
if (![sourceTypes containsObject:(NSString*)kUTTypeMovie] ) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil
message:@"Device Not Supported for video Recording."
cancelButtonTitle:@"Yes"
otherButtonTitles:@"No",nil];
[alert show];
[alert release];
return;
}
videoRecorder.sourceType = UIImagePickerControllerSourceTypeCamera;
videoRecorder.mediaTypes = [NSArray arrayWithObject:(NSString*)kUTTypeMovie];
videoRecorder.videoQuality = UIImagePickerControllerQualityTypeLow;
videoRecorder.videoMaximumDuration = 120;
videoRecorder.delegate = self;
self.recorder_ = videoRecorder;
[videoRecorder release];
[self presentModalViewController:self.recorder_ animated:YES];
This is the program that i make.
But i doesn't run good. when i open this program on iphone it immediatly turn off.
I will show my code and answer me what is the problem.
UIImagePickerController * videoRecorder = [[[UIImagePickerController alloc] init] autorelease];
videoRecorder.delegate = self;
videoRecorder.sourceType = UIImagePickerControllerSourceTypeCamera;
NSArray *sourceTypes = [UIImagePickerController availableMediaTypesForSourceType:videoRecorder.sourceType];
if (![sourceTypes containsObject:(NSString*)kUTTypeMovie] ) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil
message:@"Device Not Supported for video Recording."
cancelButtonTitle:@"Yes"
otherButtonTitles:@"No",nil];
[alert show];
[alert release];
return;
}
videoRecorder.sourceType = UIImagePickerControllerSourceTypeCamera;
videoRecorder.mediaTypes = [NSArray arrayWithObject:(NSString*)kUTTypeMovie];
videoRecorder.videoQuality = UIImagePickerControllerQualityTypeLow;
videoRecorder.videoMaximumDuration = 120;
videoRecorder.delegate = self;
self.recorder_ = videoRecorder;
[videoRecorder release];
[self presentModalViewController:self.recorder_ animated:YES];
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评论（2）
第一：以后请使用代码格式化程序。这看着就心疼。
第二：您双重释放 UIImagePicketController (videoRecorder) 自动释放将在当前运行循环退出后释放它，但您也在此处的方法调用接近结束时显式释放它，因此当 iOS 清理自动释放池时，它将获得双重释放并崩溃。
由于格式问题，我无法很好地阅读其余部分，但这似乎是您最有可能确定导致崩溃的原因。
First: Use the code formatter in the future please. This hurts to look at.
Second: You're double releasing UIImagePicketController (videoRecorder) auto-release will release it after the current runloop exits, but you're also explicitly releasing it near the end of your method call here, so when iOS cleans up the auto-release pool, it will get a double release and crash.
I can't read the rest of this well due to the formatting, but that seems like your most likely bet for what's causing the crash.
您应该编辑您的帖子并使代码可读。
问题是您在第一行中自动释放 videoRecorder，因此您不必调用 -release。 videoRecorder 在第一行中的保留计数为零，当您将其分配给 self.recorder_ 时，保留计数为 1。当您调用释放时，保留计数将变为零，并且自动释放池会使对象在记录器呈现为模态视图控制器之前消失。删除那个 -release 调用，你应该没问题。此外，您的代码将 delegate 和 sourceType 设置两次。
You should edit your post and make the code readable.
The problem is that you autorelease videoRecorder in the first line so you don't have to call the -release. videoRecorder has a retain count of zero in the first line and a retain count of one when you assign it to self.recorder_. When you call the release, then retain count goes to zero and the autorelease pool makes the object go away before the recorder can be presented as a modal view controller. Remove that -release call and you should be fine. Also, your code sets the delegate and sourceType two times.