iOS开发 调用系统相机和相册

调用系统相机和相册 （iPad，iPhone）
打开相机：（iPad，iPhone）
//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];

打开相册：（区分pad和iphone）for iphone：
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];

打开相册for ipad:
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];

点击相册中的图片 货照相机照完后点击use
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info

点击cancel 调用的方法
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker

注意：需要添加@property (nonatomic, retain) UIPopoverController *imagePicker;