UIImagePickerController

可用來選取照片(從photo library中)或重新拍照(使用camera)...在使用的時候需要先產生UIImagePickerController  實作, 為其指定委託(delegate), 並選擇圖像來源類型, 設定圖像是否可編輯,  最後將其啓動, 顯示其檢視



建立UIImagePickerController

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

設定來源
// 透過相機取的新的照片

imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera; 

// 圖片位置為iPhone photo library

imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; 

// 使用照片保存相簿為來源

imagePicker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum; 

一般指定來源之前 ,  要檢查一下 , 以確保指定的圖片來源可用, 可使用 isSourceTypeAvailable

if ([UIImagePickerController isSourceTypeAvailable:

UIImagePickerControllerSourceTypePhotoLibrary) 

{

<#statements#>

}

指定委託, 委託必須實作UIImagePickerControllerDelegate協議 , 來對使用者在圖像選取器中的動作(例如點擊 "cancel"按鈕)

imagePicker.delegate = self;

設定為可編輯

imagePicker.allowsEditing = YES;

啓動

 [self presentModalViewController:imagePicker animated:YES];

UIImagePickerControllerDelegate協議

//Tells the delegate that the user picked a still image or movie.

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

{

}

//Tells the delegate that the user cancelled the pick operation.

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker

{

}

//Tells the delegate that the user picked an image. (Deprecated in iOS 3.0. Use imagePickerController:didFinishPickingMediaWithInfo: instead.)

- (void)imagePickerController:(UIImagePickerController *)picker 

didFinishPickingImage:(UIImage *)image 

  editingInfo:(NSDictionary *)editingInfo

{

}

收回UIImagePickerController

[imagePicker dismissModalViewControllerAnimated:YES];