ipad開發從圖片庫中加載圖片

在設計Ipad項目時從圖片庫中加載圖片好處是用戶可以通過數據線以及mac電腦上的itunes或預覽程序 同步圖片信息，這樣可以方便圖片的管理，應用程序從圖片庫獲取圖片，可以通過如下方法：

UIImagePickerController *ipc = [[UIImagePickerController alloc] init];

ipc.sourceType =  UIImagePickerControllerSourceTypePhotoLibrary; //圖片庫的源

ipc.delegate = self;  //代理爲self 可見我們應該把用戶pick的相關動作處理在當前類中實現，實現代理的協議UIImagePickerControllerDelegate

ipc.allowsImageEditing = NO; //禁止編輯

[self presentModalViewController:ipc animated:YES] ; //彈出模式對話框 

之後就是對用戶選取的處理了

@interface TestBedViewController : UIViewController <UINavigationControllerDelegate,UIImagePickerControllerDelegate>

@end

@implementation TestBedViewController

// 3.0-3.1 提供

- (void) setAllowsEditing:(BOOL)doesAllow forPicker:(UIImagePickerController *) ipc

{

SEL allowsSelector;

if ([ipc respondsToSelector:@selector(setAllowsEditing:)]) allowsSelector = @selector(setAllowsEditing:);

NSMethodSignature *ms = [ipc methodSignatureForSelector:allowsSelector];

NSInvocation *inv = [NSInvocation invocationWithMethodSignature:ms];

[inv setTarget:ipc];

[inv setSelector:allowsSelector];

[inv setArgument:&doesAllow atIndex:2];

[inv invoke];

}

//  2.x 提供  當用戶選取完成一副圖片庫中的圖片保存到字典中

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo

{

NSDictionary *dict = [NSDictionary dictionaryWithObject:imageforKey:@"UIImagePickerControllerOriginalImage"];

[self imagePickerController:picker didFinishPickingMediaWithInfo:dict];

}

// 如果用戶取消

- (void) imagePickerControllerDidCancel: 

(UIImagePickerController *)picker

{

[self dismissModalViewControllerAnimated:YES];

[picker release];

}

//從字典獲取圖片並顯示到當前窗口，同時關閉模態窗口 

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

{

SETIMAGE([info objectForKey:@"UIImagePickerControllerOriginalImage"]);

[self dismissModalViewControllerAnimated:YES];

[picker release];

}