UIImagePickerControllerDelegate 没有正确响应答案

【问题标题】：UIImagePickerControllerDelegate not responding properlyUIImagePickerControllerDelegate 没有正确响应
【发布时间】：2011-05-20 18:29:32
【问题描述】：

我在 iPhone 3Gs 上使用 iOS 4.2.1 中的 UIImagePickerController。我以前使用过不推荐使用的方法

- (void)imagePickerController: didFinishPickingImage: editingInfo:

没有问题。我有另一个应用程序在另一个应用程序中使用了新的 didFinishPickingMediaWithInfo API，一旦选择了媒体，选择器就永远不会调用该方法。

//MyViewController.h
    @interface MyViewController : UIViewController < UIImagePickerControllerDelegate, UINavigationControllerDelegate>

//MyViewController.m

    if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {
        UIImagePickerController *picker =  [[UIImagePickerController new] autorelease];
        picker.delegate = self;
        picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
        picker.mediaTypes =  [[NSArray alloc] initWithObjects: (NSString *) kUTTypeMovie, nil];
        picker.videoQuality = UIImagePickerControllerQualityTypeHigh;
        picker.allowsEditing = NO;
        [self presentModalViewController:picker animated:TRUE];
    }

    - (void)imagePickerController:(UIImagePickerController *)picker imagePickerController:didFinishPickingMediaWithInfo:(NSDictionary *)editingInfo{
        //**NEVER CALLED**
    }

【问题讨论】：

那个代码块被调用了吗？我的意思是——[UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary] 是否返回YES？

标签： iphone ipad ios sdk ios4

【解决方案1】：

你有

- (void)imagePickerController:(UIImagePickerController *)picker imagePickerController:didFinishPickingMediaWithInfo:(NSDictionary *)editingInfo

你可能想要的地方

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info

【讨论】：

【解决方案2】：

你有这个： - (void)imagePickerController:(UIImagePickerController *)picker imagePickerController:didFinishPickingMediaWithInfo:(NSDictionary *)editingInfo

看起来您重复了该方法的“imagePickerController:”部分。

【讨论】：

【解决方案3】：

将选择器放在自动释放池中可能是您的问题——它可能不会停留足够长的时间来调用它的委托。改为保留它：

UIImagePickerController *picker = [[UIImagePickerController alloc] init];

然后在委托中你可以释放它：

[picker dismissModalViewControllerAnimated:YES];
[picker release];

【讨论】：

【解决方案4】：

可能是这一行：

if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {

返回 false。如果用户的照片库为空，则会发生这种情况；例如，在 iPhone 模拟器上就是这样。

编辑：正如其他示例所示，您还输入了错误的委托方法。应该是：

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info

【讨论】：

【解决方案5】：

这是我用来在 3g 上通过 iOS 4.2 将视频上传到 web 服务的程序

-(void)uploadeVideoClicked{
    UIImagePickerController *ipc = [[UIImagePickerController alloc] init];
    ipc.sourceType =  UIImagePickerControllerSourceTypePhotoLibrary;
    ipc.allowsEditing=NO;
    ipc.videoQuality = UIImagePickerControllerQualityTypeMedium;
    ipc.mediaTypes =[UIImagePickerController availableMediaTypesForSourceType:ipc.sourceType];     
    ipc.mediaTypes = [NSArray arrayWithObject:(NSString *)kUTTypeMovie];
    ipc.delegate = self;
    [self presentModalViewController:ipc animated:YES];
}

- (void)imagePickerController:(UIImagePickerController *)picker  didFinishPickingMediaWithInfo:(NSDictionary *)info

{
    NSMutableDictionary *infoDict = [[NSMutableDictionary alloc]init];
    NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];
    if ([mediaType isEqualToString:@"public.image"]){
        UIAlertView *myAlertView = [[UIAlertView alloc] initWithTitle:@"" message:@"You Select a image Please select Movie" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [myAlertView show];
        [myAlertView release];
    } else if ([mediaType isEqualToString:@"public.movie"]){
        NSURL *videoURL = [info objectForKey:UIImagePickerControllerMediaURL];
        mAppDelegate.uploadType = @"Video";
        NSData *webData = [NSData dataWithContentsOfURL:videoURL];
        [infoDict setValue:webData forKey:@"VideoUrl"];
        [infoDict setValue:[[mAppDelegate.userInfoArray objectAtIndex:1]valueForKey:@"user_id"] forKey:@"user_id"];
        //Call webService to upload video ;
    }
    [picker dismissModalViewControllerAnimated:YES];
    [infoDict release];
}

【讨论】：