UIImagePickerController学习

有一个 插入图片按钮，响应函数为：

- (IBAction)insertPhoto:(id)sender {    UIAlertView *alert = [[UIAlertView alloc]initWithTitle:nil message:@"插入图片" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"系统相册",@"拍摄", nil];    [alert show];    [alert release];}

弹出一个对话框，让用户选择图片的来源，是自己拍摄还是通过系统相册插入。

对话框的代理函数为：

-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{    NSLog(@"index = %d",buttonIndex);    if (buttonIndex == 1)     {        [self addPhoto];    }    else if(buttonIndex == 2)    {        [self takePhoto];    }}

确定用户选择的图片来源方式。选择1，调用addPhoto从相册读取图片。选择2，调用takePhoto让用户自己拍摄一张图片。

-(void)addPhoto{    //初始化UIImagePickerController对象    UIImagePickerController *imagePickerController = [[UIImagePickerController alloc]init];    //设置图片的来源方式为从图片库中，图片的来源方式有3种：    //UIImagePickerControllerSourceTypeCamera让用户照一张照片    //UIImagePickerControllerSourceTypePhotoLibrary让用户选择一个相册，然后从相册选择一张图片    //UIImagePickerControllerSourceTypeSavedPhotosAlbum让用户从最近拍摄的照片中选择一张    [imagePickerController setSourceType:UIImagePickerControllerSourceTypePhotoLibrary];    //设置代理，选择完或者取消的时候调用代理方法    [imagePickerController setDelegate:self];    //把相册视图展现出来    [self presentModalViewController:imagePickerController animated:YES];    [imagePickerController release];}

-(void)takePhoto{    UIImagePickerController *imagePickerController = [[UIImagePickerController alloc]init];    //确定设备是否支持照相功能，如支持，设置来源为相机等等。如果不是，弹出警告匡    if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {        [imagePickerController setSourceType:UIImagePickerControllerSourceTypeCamera];        [imagePickerController setDelegate:self];        [self presentModalViewController:imagePickerController animated:YES];            }    else{        UIAlertView *aler = [[[UIAlertView alloc]initWithTitle:@"Sorry" message:@"该设备不支持拍照功能" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil]autorelease];        [aler show];        aler.delegate = nil;    }        [imagePickerController release];}

代理方法，当选择好图片后调用，显示选中的图片：

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{       UIImage * image = [info objectForKey:@"UIImagePickerControllerOriginalImage"];    self.imageView.image = image;     [picker dismissModalViewControllerAnimated:YES];}

测试：把一张照片加入到相册中，

- (IBAction)savePhoto:(id)sender {    UIImage *image = [UIImage imageNamed:@"ZGR.jpg"];    UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);    }