1。 定义 类变量：
?? ? ??UIImagePickerController*?picker_library_;
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2。实现?UIImagePickerControllerDelegate ? 这个delegate
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3。 以模态的方式，显示 图片选取器
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- picker_library_?=?[[UIImagePickerController?alloc]?init];??
- ????picker_library_.sourceType?=?UIImagePickerControllerSourceTypePhotoLibrary;??
- ????picker_library_.allowsEditing?=?YES;??
- ????picker_camera_.allowsImageEditing=YES;??
- ????picker_library_.delegate?=?self;??
- ????[self?presentModalViewController:?picker_library_??
- ????????????????????????????animated:?YES];??
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?? ? ?其中，sourceType 指定了 几种 图片的来源：
?? ? ?UIImagePickerControllerSourceTypePhotoLibrary：表示显示所有的照片
?? ? ?UIImagePickerControllerSourceTypeCamera：表示从摄像头选取照片
?? ? ?UIImagePickerControllerSourceTypeSavedPhotosAlbum：表示仅仅从相册中选取照片。
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?? ? ?allowEditing和allowsImageEditing ?设置为YES，表示 允许用户编辑图片，否则，不允许用户编辑。
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4。 当用户选择一个图片以后，有可能调用两种不同的函数，根据版本的不同。所以，如果要同时支持高版本和低版本的兼容性，那么就
?? ? ?要处理两种函数。
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?? ? ?//3.x??用户选中图片后的回调
- (void)imagePickerController: (UIImagePickerController?*)picker?
didFinishPickingMediaWithInfo: (NSDictionary?*)info
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?? ??//2.x??用户选中图片之后的回调
- (void)imagePickerController:(UIImagePickerController?*)picker didFinishPickingImage:(UIImage?*)image editingInfo:(NSDictionary?*)editingInfo
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?? ? 两种函数的处理代码如下：
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- ??
- -?(void)imagePickerController:?(UIImagePickerController?*)picker???
- didFinishPickingMediaWithInfo:?(NSDictionary?*)info??
- {??
- ????if?(picker?==?picker_camera_)???
- ????{??
- ??????????
- ????????UIImage*?original_image?=?[info?objectForKey:@"UIImagePickerControllerOriginalImage"];??
- ????????UIImageWriteToSavedPhotosAlbum(original_image,?self,???
- ???????????????????????????????????????@selector(image:didFinishSavingWithError:contextInfo:),???
- ???????????????????????????????????????nil);??
- ????}??
- ??????
- ??????
- ????UIImage*?image?=?[info?objectForKey:?@"UIImagePickerControllerEditedImage"];??
- ??????
- ??????
- ????[self?dismissModalViewControllerAnimated:YES];??
- ????[picker?release];??
- }??
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?? ? ?
- ??
- -?(void)imagePickerController:(UIImagePickerController?*)picker?didFinishPickingImage:(UIImage?*)image?editingInfo:(NSDictionary?*)editingInfo??
- {??
- ????NSMutableDictionary?*?dict=?[NSMutableDictionary?dictionaryWithDictionary:editingInfo];??
- ??????
- ????[dict?setObject:image?forKey:@"UIImagePickerControllerEditedImage"];??
- ??????
- ??????
- ????[self?imagePickerController:picker?didFinishPickingMediaWithInfo:dict];??
- }??
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??5。 用户取消选择
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- ??
- -?(void)?imagePickerControllerDidCancel:?(UIImagePickerController?*)picker??
- {??
- ????[self?dismissModalViewControllerAnimated:YES];??
- ????[picker?release];??
- }??
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