我正在合并多个视频和多首歌曲,因为相同的代码昨天运行得非常好,但是今天我得到了以下的响应
AVAssetExportSessionStatus = 4,error = Error Domain=AVFoundationErrorDomain Code=-11841 "The operation couldn’t be completed. (AVFoundationErrorDomain error -11841.)"
我做了一些研究,发现导出失败了视频合成无效.请查看视频合成有什么问题.
- (void)mergeAllselectedVideos
{
NSArray *pathArray = [DocumentDirectory getUrlFromDocumentDirectoryOfList:self.selectedClipsArray];
AVMutableComposition *mixComposition = [[AVMutableComposition alloc]init];
NSMutableArray *layerinstructions = [[NSMutableArray alloc]init];
CMTime time = kCMTimeZero;
CMTime previousSongDuration = kCMTimeZero;
for (int i = 0 ; i < pathArray.count; i++)
{
//VIDEO TRACK//
time = CMTimeAdd(time, previousSongDuration);
NSURL *url = [NSURL URLWithString:[pathArray objectAtIndex:i]];
AVAsset *avAsset = [AVAsset assetWithURL:url];
AVMutableCompositionTrack *track = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];
[track insertTimeRange:CMTimeRangeMake(kCMTimeZero, avAsset.duration) …我想重新加载tabbar控制器(UIViewController)中包含的所有视图.搜索后我发现我要应用setNeedsDisplay方法,但我无法在哪里应用它.还欢迎其他任何替代方案
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
.....
.....
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
[self customToolbar];
[self.window addSubview:tabBarController.view];
[self.window makeKeyAndVisible];
return YES;
}
-(void)customToolbar
{
//Declared view controllers and their Navigation Controller
.....
//Declared tab bar items
.....
tabBarController = [[GTabBar alloc] initWithTabViewControllers:viewControllersArray tabItems:tabItemsArray initialTab:1];
}
如何从UIImage获取URL？我有一个来自iPhone库的图像,我调整了它的大小,我不想保存新图像,但我想得到它的URL.
我在UIWebview中显示NSString以显示带有自定义表情符号(图像)的文本但我遇到了麻烦,因为UIWebview无法检测特殊字符,如\n,\ r,\ t,空格,&,<,>和更多的字符串.如何将NSString转换为HTML字符串以在UIWebView中加载？
我有一个视图控制器,在启动时有导航栏.
在一些UIViewConrollers之后,我添加了一个tabbar控制器,我为每个标签栏创建了四个标签栏和四个视图控制器.
现在如果我创建带有与每个选项卡相关的导航栏的标签栏,它会在顶部显示两个导航栏,如果创建没有导航栏的标签栏,它将只显示一个标签栏,但我无法将与每个标签视图控制器对应的标题添加到该导航bar
这是我创建标签栏的代码
EventDetailViewController *firstViewController = [[EventDetailViewController alloc]init];
firstViewController.tabBarItem = [[[UITabBarItem alloc]initWithTitle:@"Home" image:[UIImage imageNamed:@"Multimedia-Icon-Off.png"] tag:2]autorelease]; MoreInfo *secondViewController = [[MoreInfo alloc]init];
secondViewController.tabBarItem = [[[UITabBarItem alloc]initWithTitle:@"Info" image:[UIImage imageNamed:@"Review-Icon-Off.png"] tag:0]autorelease];
PlaceInfoViewController *thirdViewController = [[PlaceInfoViewController alloc]init];
thirdViewController.tabBarItem = [[[UITabBarItem alloc]initWithTitle:@"Lugar" image:[UIImage imageNamed:@"Place-icon-OFF.png"] tag:1]autorelease];
FavoritesViewController *forthViewController = [[FavoritesViewController alloc]init];
forthViewController.tabBarItem = [[[UITabBarItem alloc]initWithTitle:@"Compartir" image:[UIImage imageNamed:@"Compartir-Icon-Off.png"] tag:3]autorelease];
UITabBarController *tabBarController = [[UITabBarController alloc] initWithNibName:nil bundle:nil];
tabBarController.viewControllers = [[NSArray alloc] initWithObjects:firstViewController, secondViewController, thirdViewController, forthViewController, nil];
tabBarController.view.frame = self.view.frame;
[self.view addSubview:tabBarController.view];
[firstViewController release];
[secondViewController release];
[thirdViewController release];
[forthViewController …我将捕获的视频保存在文档目录中,如下所示,现在我想显示缩略图并播放相同的视频.如何做到这一点？
- (void) imagePickerController: (UIImagePickerController *) picker didFinishPickingMediaWithInfo: (NSDictionary *) info
{
NSString *mediaType = [info objectForKey: UIImagePickerControllerMediaType];
[self dismissModalViewControllerAnimated:NO];
// Handle a movie capture
if (CFStringCompare ((__bridge_retained CFStringRef) mediaType, kUTTypeMovie, 0) == kCFCompareEqualTo)
{
NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDir = [documentPaths objectAtIndex:0];
NSString *movieName = [NSString stringWithFormat:@"%@.mov",[CoreDataFunctions getNameForVideoForDate:[CalendarFunctions getCurrentDateString]]];
NSString *moviePath = [documentsDir stringByAppendingPathComponent:movieName];
NSURL * movieURL = [info valueForKey:UIImagePickerControllerMediaURL];
NSData * movieData = [NSData dataWithContentsOfURL:movieURL];
NSLog(@"%@",moviePath);
if([movieData writeToFile:moviePath atomically:NO])
{
if(![CoreDataFunctions saveVideoInfoInDatabaseForDate:[CalendarFunctions getCurrentDateString]])
{
NSLog(@"Video …[[[UINavigationBar appearance] setTitleView:button]
我尝试使用上面的代码行将标题视图设置为所有导航项的按钮,但它不起作用.如何通过在appdelegate中编写小代码来为项目中的所有导航栏设置标题视图？
iphone objective-c uinavigationbar uinavigationcontroller ios