iphone 怎么使用图片选取器 UIImagePickerController

1。 定义 类变量：

UIImagePickerController* picker_library_;

2。实现 UIImagePickerControllerDelegate 这个delegate

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];

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。

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。

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。

//3.x 用户选中图片后的回调

- (void)imagePickerController: (UIImagePickerController *)picker

didFinishPickingMediaWithInfo: (NSDictionary *)info

//2.x 用户选中图片之后的回调

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo

两种函数的处理代码如下：

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//3.x 用户选中图片后的回调

- (void)imagePickerController: (UIImagePickerController *)picker

didFinishPickingMediaWithInfo: (NSDictionary *)info

{

if (picker == picker_camera_)

{

//如果是 来自照相机的image，那么先保存

UIImage* original_image = [info objectForKey:@"UIImagePickerControllerOriginalImage"];

UIImageWriteToSavedPhotosAlbum(original_image, self,

@selector(image:didFinishSavingWithError:contextInfo:),

nil);

}

//获得编辑过的图片

UIImage* image = [info objectForKey: @"UIImagePickerControllerEditedImage"];

[self dismissModalViewControllerAnimated:YES];

[picker release];

}

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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

{

NSMutableDictionary * dict= [NSMutableDictionary dictionaryWithDictionary:editingInfo];

[dict setObject:image forKey:@"UIImagePickerControllerEditedImage"];

//直接调用3.x的处理函数

[self imagePickerController:picker didFinishPickingMediaWithInfo:dict];

}

5。 用户取消选择

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// 用户选择取消

- (void) imagePickerControllerDidCancel: (UIImagePickerController *)picker

{

[self dismissModalViewControllerAnimated:YES];

[picker release];

}