[IOS]用UIImagePickerController调用系统照相机

iPhone API 中提供了调用系统照相机的接口，我们只需调用相应的界面，即刻在自己的程序中获取相机图片。下面是一个非常简单的调用系统照相机的例子，相应的界面如下:

最后可以编辑图片和使用相应的图片。

下面是主要代码:

- (void) addPicEvent 
{ 
    //先设定sourceType为相机，然后判断相机是否可用（ipod）没相机，不可用将sourceType设定为相片库 
    UIImagePickerControllerSourceType sourceType = UIImagePickerControllerSourceTypeCamera; 
    if (![UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypeCamera]) { 
        sourceType = UIImagePickerControllerSourceTypePhotoLibrary; 
    }
        //sourceType = UIImagePickerControllerSourceTypeCamera; //照相机 
        //sourceType = UIImagePickerControllerSourceTypePhotoLibrary; //相片库
        //sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum; //保存的相片
    UIImagePickerController *picker = [[UIImagePickerController alloc] init]; 
    picker.delegate = self; 
    picker.allowsEditing = YES; 
    picker.sourceType = sourceType; 
    [self presentModalViewController:picker animated:YES]; 
    [picker release]; 
} 
- (void)saveImage:(UIImage *)image { 
    NSLog(@"保存"); 
} 
#pragma mark – 
#pragma mark Camera View Delegate Methods 
- (void)imagePickerController:(UIImagePickerController *)picker 
didFinishPickingMediaWithInfo:(NSDictionary *)info { 
    [picker dismissModalViewControllerAnimated:YES]; 
    UIImage *image = [[info objectForKey:UIImagePickerControllerEditedImage] retain]; 
    [self performSelector:@selector(saveImage:) 
               withObject:image 
               afterDelay:0.5]; 
} 
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker { 
    [picker dismissModalViewControllerAnimated:YES]; 
}