【學習ios之路:UI系列】點擊更換頭像實現從相簿讀取照片和拍照兩種功能

標籤：

功能如下:

1.點擊頭像,提示選擇更換頭像方式①相簿 ②照相.

2.點擊相簿,實現通過讀取系統相簿,擷取圖片進行替換.

3.點擊照相,通過網路攝影機照相,進行替換照片.

4.如果網路攝影機,彈出框警告.

代碼如下:

1.通過UIActionSheet對象實現提示功能

   //建立對象    UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:                             @"提示" delegate:self cancelButtonTitle:@"取消"                     destructiveButtonTitle:nil otherButtonTitles:@"相簿",@"拍照", nil];    //在視圖上展示     [actionSheet showInView:self.view];    [actionSheet release];

2.實現相應代理事件,代理UIActionSheetDelegate,方法如下

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:                                                     (NSInteger)buttonIndex {    // 相簿 0 拍照 1    switch (buttonIndex) {        case 0:            //從相簿中讀取            [self readImageFromAlbum];            break;        case 1:            //拍照            [self readImageFromCamera];            break;        default:            break;    }}

3.實現從相簿讀取圖片功能,代碼如下

//從相簿中讀取- (void)readImageFromAlbum {    //建立對象    UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];    //（選擇類型）表示僅僅從相簿中選取照片    imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;    //指定代理，因此我們要實現UIImagePickerControllerDelegate,                                               UINavigationControllerDelegate協議    imagePicker.delegate = self;    //設定在相簿選完照片後，是否跳到編輯模式進行圖片剪裁。(允許使用者編輯)    imagePicker.allowsEditing = YES;    //顯示相簿    [self presentViewController:imagePicker animated:YES completion:nil];    [imagePicker release];    }

4.實現拍照功能

- (void)readImageFromCamera {        if ([UIImagePickerController isSourceTypeAvailable:                                         UIImagePickerControllerSourceTypeCamera]) {       UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];        imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;        imagePicker.delegate = self;        imagePicker.allowsEditing = YES; //允許使用者編輯        [self presentViewController:imagePicker animated:YES completion:nil];        [imagePicker release];    } else {        //快顯視窗響應點擊事件        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"警告"                       message:@"未檢測到網路攝影機" delegate:nil cancelButtonTitle:nil                                               otherButtonTitles:@"確定", nil];        [alert show];        [alert release];    }}

5.圖片完成處理後提交,代理方法UIPickerControllerDelegate

//圖片完成之後處理- (void)imagePickerController:(UIImagePickerController *)picker      didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo {       //image 就是修改後的照片    //將圖片添加到對應的視圖上    [button setImage:image forState:UIControlStateNormal];    //結束操作    [self dismissViewControllerAnimated:YES completion:nil];}

【學習ios之路:UI系列】點擊更換頭像實現從相簿讀取照片和拍照兩種功能