//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; //图片库//sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum; //保存的相片UIImagePickerController *picker = [[UIImagePickerController alloc] init];//初始化picker.delegate = self;picker.allowsEditing = YES;//设置可编辑picker.sourceType = sourceType;[self presentModalViewController:picker animated:YES];//进入照相界面[picker release];

UIImagePickerController *pickerImage = [[UIImagePickerController alloc] init];if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {pickerImage.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;//pickerImage.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;pickerImage.mediaTypes = [UIImagePickerController availableMediaTypesForSourceType:pickerImage.sourceType];}pickerImage.delegate = self;pickerImage.allowsEditing = NO;[self presentModalViewController:pickerImage animated:YES];[pickerImage release];

UIImagePickerControllerSourceType sourceType = UIImagePickerControllerSourceTypePhotoLibrary;//sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum; //保存的相片UIImagePickerController *picker = [[UIImagePickerController alloc] init];picker.delegate = self;picker.allowsEditing = NO;//是否允许编辑picker.sourceType = sourceType;/*如果从一个导航按钮处呈现，使用：presentPopoverFromBarButtonItem:permittedArrowDirections:animated:；如果要从一个视图出呈现，使用：presentPopoverFromRect:inView:permittedArrowDirections:animated: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：didRotateFromInterfaceOrientation:（在这个方法体里面重新设置rect）然后再次调用：- (void)presentPopoverFromRect:(CGRect)rect inView:(UIView *)view permittedArrowDirections:(UIPopoverArrowDirection)arrowDirections animated:(BOOL)animated             *///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。UIPopoverController *popover = [[UIPopoverController alloc]initWithContentViewController:picker];self.imagePicker = popover;//permittedArrowDirections 设置箭头方向[self.imagePicker presentPopoverFromRect:CGRectMake(0, 0, 300, 300) inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];[picker release];[popover release];