上傳文件時，我們都的從本地中選擇或用相機來拍攝得到文件。
一個上傳按鈕，單擊事件
1 -(IBAction)btnClick{ 2 UIActionSheet* actionSheet = [[UIActionSheet alloc] 3 initWithTitle:@"請選擇文件來源" 4 delegate:self 5 cancelButtonTitle:@"取消" 6 destructiveButtonTitle:nil 7 otherButtonTitles:@"照相機",@"攝像機",@"本地相簿",@"本地視頻",nil]; 8 [actionSheet showInView:self.view]; 9 [actionSheet release]; 10 }
點擊按鈕觸發的btnClick事件后將會彈出一個如下的選擇筐：
接下來將要為UIActionSheet實現其中的委托了。
1 #pragma mark - 2 #pragma UIActionSheet Delegate 3 - (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex 4 { 5 NSLog(@"buttonIndex = [%d]",buttonIndex); 6 switch (buttonIndex) { 7 case 0://照相機 8 {10 UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init]; 11 imagePicker.delegate = self; 12 imagePicker.allowsEditing = YES; 13 imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera; 14 imagePicker.mediaTypes = [[NSArray alloc] initWithObjects: (NSString *) kUTTypeImage, nil]; 15 [self presentModalViewController:imagePicker animated:YES]; 16 [imagePicker release]; 17 } 18 break; 19 case 1://攝像機 20 {22 UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init]; 23 imagePicker.delegate = self; 24 imagePicker.allowsEditing = YES; 25 imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera; 26 imagePicker.mediaTypes = [[NSArray alloc] initWithObjects: (NSString *) kUTTypeMovie, nil]; 27 imagePicker.videoQuality = UIImagePickerControllerQualityTypeLow; 28 [self presentModalViewController:imagePicker animated:YES]; 29 [imagePicker release]; 30 } 31 break; 32 case 2://本地相簿 33 {35 UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init]; 36 imagePicker.delegate = self; 37 imagePicker.allowsEditing = YES; 38 imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; 39 imagePicker.mediaTypes = [[NSArray alloc] initWithObjects: (NSString *) kUTTypeImage, nil]; 40 [self presentModalViewController:imagePicker animated:YES]; 41 [imagePicker release]; 42 } 43 break; 44 case 3://本地視頻 45 {47 UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init]; 48 imagePicker.delegate = self; 49 imagePicker.allowsEditing = YES; 50 imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; 51 imagePicker.mediaTypes = [[NSArray alloc] initWithObjects: (NSString *) kUTTypeMovie, nil]; 52 [self presentModalViewController:imagePicker animated:YES]; 53 [imagePicker release]; 54 } 55 break; 56 default: 57 break; 58 } 59 }
實現了UIActionSheet的委托后，要發現，我們使用了UIImagePickerController，這個類將幫我們實現選取文件，打開對應的選取方式。比如當ButtonIndex為0的時候，它將幫我們打開照相機，我們可以使用相機拍攝照片作為上傳的選取文件。因此，在這里我們還要實現UIImagePickerController的委托：
1 #pragma mark - 2 #pragma UIImagePickerController Delegate 3 - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info 4 { 5 if ([[info objectForKey:UIImagePickerControllerMediaType] isEqualToString:(NSString*)kUTTypeImage]) { 6 UIImage *img = [info objectForKey:UIImagePickerControllerEditedImage]; 7 self.fileData = UIImageJPEGRepresentation(img, 1.0); 8 } else if ([[info objectForKey:UIImagePickerControllerMediaType] isEqualToString:(NSString*)kUTTypeMovie]) { 9 NSString *videoPath = [[info objectForKey:UIImagePickerControllerMediaURL] path]; 10 self.fileData = [NSData dataWithContentsOfFile:videoPath]; 11 } 12 [picker dismissModalViewControllerAnimated:YES]; 13 } 14 15 - (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker 16 { 17 [picker dismissModalViewControllerAnimated:YES]; 18 }
之后，你選取的文件便保存在了filedata中。就可以隨時過來調用了。