代替过时UIImagePickerControllerDelegate方法的使用呢？

Question

我跟着一个伟大的教程（ HTTP：// iphone。 zcentric.com/2008/08/28/using-a-uiimagepickercontroller/ ）上使用的UIImagePickerController来从相册或相机在iPhone上的图像。问题是，该教程是有点过时和文档引用使用的委托作为自3.0被贬值的方法。问题是，该文件未能提供线索，在什么地方使用？不推荐使用的方法是：

– imagePickerController:didFinishPickingImage:editingInfo:

在上面的方法的使用如下：

- (void) imagePickerController:(UIImagePickerController*)picker didFinishPickingImage:(UIImage*)img editingInfo:(NSDictionary*)editInfo
{

    image.image = img;
    [[picker parentViewController] dismissModalViewControllerAnimated:YES];


}

问题：<？强>什么代替弃用方法的目前使用的

Answer 1

引述苹果文档：

imagePickerController:didFinishPickingImage:editingInfo:

     

告诉用户拾取的图像委托。这种方法是可选的。 （的弃用在iPhone OS 3.0 使用 imagePickerController:didFinishPickingMediaWithInfo: 不是的。）

Answer 2

下面介绍如何使用新的图像拾取API一言以蔽之。

首先，你需要声明的是这样一类，因为它的设置本身作为图像拾取委托：

@interface MyClass : UIViewController <UINavigationControllerDelegate, UIImagePickerControllerDelegate> {
UIImagePickerController*    imagePicker;
}
@property(nonatomic,retain) UIImagePickerController* imagePicker;

- (IBAction) takePicture:(id)sender;

@end

这带来了影像选择器会去像这样的方法。它宣称这里在Interface Builder的IBAction这样你就可以将其直接连线到控制（如按钮）。它还检查，这样如果你在iPhone上它带来了相机接口，但在iPod触摸它带来了画廊选择器：

#import <MobileCoreServices/UTCoreTypes.h>
...
@synthesize imagePicker = _imagePicker;
...

- (void) takePicture:(id)sender
{
        if (!_imagePicker) {
            self.imagePicker = [[UIImagePickerController alloc] init];
            self.imagePicker.delegate = self;
        }

        if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
            self.imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
            NSArray* mediaTypes = [UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerSourceTypeCamera];
            self.imagePicker.mediaTypes = mediaTypes;
        } else {
            self.imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; 
            self.imagePicker.allowsImageEditing = YES; 
        }

    [self presentModalViewController:self.imagePicker animated:YES];
}

然后，你需要这两种方法：

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    [[picker parentViewController] dismissModalViewControllerAnimated:YES]; 

    // MediaType can be kUTTypeImage or kUTTypeMovie. If it's a movie then you
    // can get the URL to the actual file itself. This example only looks for images.
    //   
    NSString* mediaType = [info objectForKey:UIImagePickerControllerMediaType];
    // NSString* videoUrl = [info objectForKey:UIImagePickerControllerMediaURL];

    // Try getting the edited image first. If it doesn't exist then you get the
    // original image.
    //
    if (CFStringCompare((CFStringRef) mediaType, kUTTypeImage, 0) == kCFCompareEqualTo) {       
        UIImage* picture = [info objectForKey:UIImagePickerControllerEditedImage];
        if (!picture)
            picture = [info objectForKey:UIImagePickerControllerOriginalImage];     

            // **You can now do something with the picture.
    }
    self.imagePicker = nil;
}

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker 
{ 
    [[picker parentViewController] dismissModalViewControllerAnimated:YES]; 
    self.imagePicker = nil;
}