iOS中 讀取相簿,呼叫系統相機

讀取相簿以及調取相機,將圖片顯示到imageView上

佈局：

1.建立imageView 和 button 併為button一個關聯pickerImage的事件

self.aImageView = [[UIImageView alloc]initWithFrame:CGRectMake(60, 100, 200, 200)];

self.aImageView.backgroundColor = [UIColor redColor];

self.aImageView.userInteractionEnabled = YES;

self.aButton = [[UIButton alloc]initWithFrame:CGRectMake(98, 350, 125, 25)];

self.aButton.backgroundColor = [UIColor blueColor];

[self.aButton addTarget:self action:@selector(pickerImage:) forControlEvents:(UIControlEventTouchUpInside)];

[self.aButton setTitle:@"選擇影像" forState:(UIControlStateNormal)];

[self.view addSubview:self.aButton];

[self.view addSubview:self.aImageView];

[self.aButton release];

[self.aImageView release];

[self addTapGestureOnImageView];

2.因為有的場景需要直接點選圖片更換別的圖片，所以在imageView上新增輕拍動作

- (void)addTapGestureOnImageView{

UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(pickerImage:)];

[self.aImageView addGestureRecognizer:tap];

[tap release];

}

3.實現輕拍動作中方法

- (void)pickerImage:(UIButton *)button{

//新增ActionSheet控制元件，提示選項框，調出相機或拍攝圖片

//第一個引數：是行為列表的標題 一般為空

//第二個引數：遵循代理

//第三個引數：取消這個操作按鈕上 顯示的文字

//第四個引數：destructive 破壞性的, 毀滅性的 自己理解吧 反正我寫的是拍照，執行操作的意思

//第五個引數：從相簿選取圖片

UIActionSheet *actionSheet = [[UIActionSheet alloc]initWithTitle:nil delegate:self cancelButtonTitle:@"取消" destructiveButtonTitle:@"拍照" otherButtonTitles:@"從相簿選擇圖片", nil];

//在當前介面顯示actionSheet物件

[actionSheet showInView:self.view];

[actionSheet release];

}

4.實現action代理協議中的方法

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex{

switch (buttonIndex) {

case 0:

//呼叫系統相機，拍照

[self pickerPictureFromCamera];

break;

case 1:

[self pickerPictureFromPhotosAlbum];

default:

break;

}

}

4.1從攝像頭獲取圖片

- (void)pickerPictureFromCamera{

//判斷前攝像頭是否可用，如果不可用的話，用後攝像頭。如果後攝像頭也不可用的話用手機圖片庫

//判斷前置攝像頭是否可用

if ([UIImagePickerController isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceFront]) {

NSLog(@"用前置攝像頭");

self.imagePC = [[UIImagePickerController alloc]init];

self.imagePC.cameraDevice = UIImagePickerControllerCameraDeviceFront;

[self.imagePC release];

//判斷後置攝像頭是否可用

}else if ([UIImagePickerController isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceRear]){

NSLog(@"用後置攝像頭");

self.imagePC = [[UIImagePickerController alloc]init];

self.imagePC.cameraDevice = UIImagePickerControllerCameraDeviceRear;

[self.imagePC release];

//兩者都不行的話，從手機相簿調取照片

}else{

UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"呼叫攝像頭失敗" message:@"請從手機相簿中選取照片" delegate:self cancelButtonTitle:@"確定" otherButtonTitles:nil, nil];

[alertView show];

[alertView release];

}

//初始化圖片控制器物件

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

//sourceType資源樣式

//設定圖片選擇器選擇圖片的樣式

imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

//設定圖片是否允許編輯

imagePicker.allowsEditing = YES;

//設定圖片選擇器代理物件為這個檢視控制器

imagePicker.delegate = self;

//把相機推出來 模態

[self presentViewController:imagePicker animated:YES completion:nil];

//釋放

[imagePicker release];

}

4.2從手機的圖片庫獲取圖片

- (void)pickerPictureFromPhotosAlbum{

//初始化圖片控制器物件

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

//sourceType資源樣式

//設定圖片選擇器選擇圖片的樣式

imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

//設定圖片是否允許編輯

imagePicker.allowsEditing = YES;

//設定圖片選擇器代理物件為這個檢視控制器

imagePicker.delegate = self;

//把選擇控制器推出來 模態

[self presentViewController:imagePicker animated:YES completion:nil];

//釋放

[imagePicker release];

}

5.將選取好的照片儲存到詳情頁的方法

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

//以相簿作為字典，從中取出照片

self.aImageView.image = [info objectForKey:UIImagePickerControllerEditedImage];

//把選取框模態回去

[self dismissViewControllerAnimated:YES completion:nil];

}