上传时选择文件－－UIActionSheet，UIImagePickerController
上传文件时，我们都的从本地中选择或用相机来拍摄得到文件。
一个上传按钮，单击事件
1 -(IBAction)btnClick{ 2 UIActionSheet* actionSheet = [[UIActionSheet alloc] 3 initWithTitle:@"请选择文件来源" 4 delegate:self 5 cancelButtonTitle:@"取消" 6 destructiveButtonTitle:nil 7 otherButtonTitles:@"照相机",@"摄像机",@"本地相簿",@"本地视频",nil]; 8 [actionSheet showInView:self.view]; 9 [actionSheet release];10 }点击按钮触发的btnClick事件后将会弹出一个如下的选择筐：
接下来将要为UIActionSheet实现其中的委托了。
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://照相机 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://摄像机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://本地视频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 }实现了UIActionSheet的委托后，要发现，我们使用了UIImagePickerController，这个类将帮我们实现选取文件，打开对应的选取方式。比如当ButtonIndex为0的时候，它将帮我们打开照相机，我们可以使用相机拍摄照片作为上传的选取文件。因此，在这里我们还要实现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，你选取的文件便保存在了filedata中。就可以随时过来调用了。
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