调用相册和相机

打开相机：

1. //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  
2.     UIImagePickerControllerSourceType sourceType = UIImagePickerControllerSourceTypeCamera;  
3. //    if (![UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypeCamera]) {  
4. //        sourceType = UIImagePickerControllerSourceTypePhotoLibrary;  
5. //    }  
6.     //sourceType = UIImagePickerControllerSourceTypeCamera; //照相机  
7.     //sourceType = UIImagePickerControllerSourceTypePhotoLibrary; //图片库  
8.     //sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum; //保存的相片  
9.     UIImagePickerController *picker = [[UIImagePickerController alloc] init];//初始化  
10.     picker.delegate = self;  
11.     picker.allowsEditing = YES;//设置可编辑  
12.     picker.sourceType = sourceType;  
13.     [self presentModalViewController:picker animated:YES];//进入照相界面  
14.     [picker release];  

打开相册：（区分pad和iphone）

for iphone：

1. UIImagePickerController *pickerImage = [[UIImagePickerController alloc] init];  
2.     if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {  
3.         pickerImage.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;  
4.         //pickerImage.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;  
5.         pickerImage.mediaTypes = [UIImagePickerController availableMediaTypesForSourceType:pickerImage.sourceType];  
6.           
7.     }  
8.     pickerImage.delegate = self;  
9.     pickerImage.allowsEditing = NO;  
10.     [self presentModalViewController:pickerImage animated:YES];  
11.     [pickerImage release];  

for ipad:

1. UIImagePickerControllerSourceType sourceType = UIImagePickerControllerSourceTypePhotoLibrary;  
2.     //sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum; //保存的相片  
3.     UIImagePickerController *picker = [[UIImagePickerController alloc] init];  
4.     picker.delegate = self;  
5.     picker.allowsEditing = NO;//是否允许编辑  
6.     picker.sourceType = sourceType;  
7.     /* 
8.      如果从一个导航按钮处呈现，使用： 
9.      presentPopoverFromBarButtonItem:permittedArrowDirections:animated:； 
10.      如果要从一个视图出呈现，使用： 
11.      presentPopoverFromRect:inView:permittedArrowDirections:animated: 
12.       
13.      如果设备旋转以后，位置定位错误需要在父视图控制器的下面方法里面重新定位： 
14.      didRotateFromInterfaceOrientation:（在这个方法体里面重新设置rect） 
15.      然后再次调用： 
16.      - (void)presentPopoverFromRect:(CGRect)rect inView:(UIView *)view permittedArrowDirections:(UIPopoverArrowDirection)arrowDirections animated:(BOOL)animated              
17.      */  
18.     //UIPopoverController只能在ipad设备上面使用；作用是用于显示临时内容，特点是总是显示在当前视图最前端，当单击界面的其他地方时自动消失。  
19.     UIPopoverController *popover = [[UIPopoverController alloc]initWithContentViewController:picker];  
20.     self.imagePicker = popover;  
21.     //permittedArrowDirections 设置箭头方向  
22.     [self.imagePicker presentPopoverFromRect:CGRectMake(0, 0, 300, 300) inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];  
23.     [picker release];  
24.     [popover release];  

点击相册中的图片 货照相机照完后点击use  后触发的方法

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary
*)info

点击cancel 调用的方法

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker

例子下载地址：http://download.csdn.net/download/like7xiaoben/4958356