如何在ios的scrollview中添加文本字段？

debugcn 发表于 Dev

用户名

我正在制作一个应用程序，从中选择图库中的照片，并希望在每个图片或视频上都出现一个文本框，以便在我要描述该图片或视频时使用。

这是显示照片但不在滚动视图中的每个图片上方显示文本字段的代码。

-(void)launchController
{
    ELCImagePickerController *elcPicker = [[ELCImagePickerController alloc]initImagePicker];

    elcPicker.maximumImagesCount = 100;
    elcPicker.returnsOriginalImage = YES;
    elcPicker.returnsImage = YES;
    elcPicker.onOrder = YES;
    elcPicker.mediaTypes = @[(NSString *)kUTTypeImage,(NSString *)kUTTypeMovie];
    elcPicker.imagePickerDelegate = self;
    [self presentViewController:elcPicker animated:YES completion:Nil];
}
-(void)launchSpecialController
{
    ALAssetsLibrary *library = [[ALAssetsLibrary alloc]init];
    self.specialLibrary = library;
    NSMutableArray *groups = [NSMutableArray array];
    [_specialLibrary enumerateGroupsWithTypes:ALAssetsGroupSavedPhotos usingBlock:^(ALAssetsGroup *group , BOOL *stop){
        if(group){
            [groups addObject:group];

        }else{
        [self displayPickerForGroup:[groups objectAtIndex:0]];
        }


    } failureBlock:^(NSError *error) {
        chosenImages = nil;
        UIAlertView * alert = [[UIAlertView alloc] initWithTitle:@"Error" message:[NSString stringWithFormat:@"Album Error: %@ - %@", [error localizedDescription], [error localizedRecoverySuggestion]] delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil];
        [alert show];

        NSLog(@"A problem occured %@", [error description]);
        // an error here mean
    }];

}
- (void)displayPickerForGroup:(ALAssetsGroup *)group
{
    ELCAssetTablePicker *tablePicker = [[ELCAssetTablePicker alloc] initWithStyle:UITableViewStylePlain];
    tablePicker.singleSelection = YES;
    tablePicker.immediateReturn = YES;

    ELCImagePickerController *elcPicker = [[ELCImagePickerController alloc] initWithRootViewController:tablePicker];
    elcPicker.maximumImagesCount = 1;
    elcPicker.imagePickerDelegate = self;
    elcPicker.returnsOriginalImage = YES; //Only return the fullScreenImage, not the fullResolutionImage
    elcPicker.returnsImage = YES; //Return UIimage if YES. If NO, only return asset location information
    elcPicker.onOrder = NO; //For single image selection, do not display and return order of selected images
    tablePicker.parent = elcPicker;


    tablePicker.assetGroup = group;
    [tablePicker.assetGroup setAssetsFilter:[ALAssetsFilter allAssets]];

    [self presentViewController:elcPicker animated:YES completion:nil];
}
-(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
{
if(UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
{
    return YES;

}else{
    return  toInterfaceOrientation != UIInterfaceOrientationPortraitUpsideDown;

}


}
#pragma mark ELCImageControllerDelegate Methods
-(void)elcImagePickerController:(ELCImagePickerController *)picker didFinishPickingMediaWithInfo:(NSArray *)info
{
    [self dismissViewControllerAnimated:YES completion:nil];
    imageScroll = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 150, self.view.frame.size.width, 450)];
    [self.view addSubview:imageScroll];
    UITextField  *textfield1 = [[UITextField alloc]initWithFrame:CGRectMake(10, 100, 100, 40)];
    textfield1.backgroundColor = [UIColor greenColor];
    NSMutableArray *textfieldArray = [NSMutableArray arrayWithCapacity:[info count]];
    [textfieldArray addObject:textfield1];
    textfield1.text= @"hello";
    [imageScroll addSubview:textfield1];
    for(UIView *v in [imageScroll subviews]){
        [v removeFromSuperview];


    }
    CGRect workingFrame = imageScroll.frame;
    workingFrame.origin.x = 0;

    NSMutableArray *images = [NSMutableArray arrayWithCapacity:[info count]];
    for (NSDictionary *dict in info) {
        if ([dict objectForKey:UIImagePickerControllerMediaType] == ALAssetTypePhoto){
            if ([dict objectForKey:UIImagePickerControllerOriginalImage]){
                UIImage* image=[dict objectForKey:UIImagePickerControllerOriginalImage];
                [images addObject:image];

                UIImageView *imageview = [[UIImageView alloc] initWithImage:image];
                [imageview setContentMode:UIViewContentModeScaleAspectFit];
                imageview.frame = workingFrame;

                [imageScroll addSubview:imageview];

                workingFrame.origin.x = workingFrame.origin.x + workingFrame.size.width;
            } else {
                NSLog(@"UIImagePickerControllerReferenceURL = %@", dict);
            }
        } else if ([dict objectForKey:UIImagePickerControllerMediaType] == ALAssetTypeVideo){
            if ([dict objectForKey:UIImagePickerControllerOriginalImage]){
                UIImage* image=[dict objectForKey:UIImagePickerControllerOriginalImage];

                [images addObject:image];

                UIImageView *imageview = [[UIImageView alloc] initWithImage:image];
                [imageview setContentMode:UIViewContentModeScaleAspectFit];
                imageview.frame = workingFrame;

               [imageScroll addSubview:imageview];
                ;

                workingFrame.origin.x = workingFrame.origin.x + workingFrame.size.width;
            } else {
                NSLog(@"UIImagePickerControllerReferenceURL = %@", dict);
            }
        } else {
            NSLog(@"Uknown asset type");
        }
    }

    chosenImages = images;

    [imageScroll setPagingEnabled:YES];
    [imageScroll setContentSize:CGSizeMake(workingFrame.origin.x, workingFrame.size.height)];
}

- (void)elcImagePickerControllerDidCancel:(ELCImagePickerController *)picker
{
    [self dismissViewControllerAnimated:YES completion:nil];



}
- (void)viewDidLoad {
    //chosenImages = [[NSArray alloc]init];


    [super viewDidLoad];



    [self.view setBackgroundColor:[UIColor whiteColor]];

//    textfield1 = [[UITextField alloc]initWithFrame:CGRectMake(10, 100, 100, 40)];
//    textfield1.backgroundColor = [UIColor greenColor];
//    textfieldArray = [NSMutableArray arrayWithCapacity:[info count]];
//    [textfieldArray addObject:textfield1];
//    textfield1.text= @"hello";
//    [imageScroll addSubview:textfield1];


    UIButton *uploadimage = [[UIButton alloc]initWithFrame:CGRectMake(10, 30, 55, 55)];
    uploadimage.backgroundColor = [UIColor blueColor];
    [uploadimage setTitle:@"multiple images" forState:UIControlStateNormal];
    [uploadimage addTarget:self action:@selector(launchSpecialController) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:uploadimage];


    UIButton *singleimage = [[UIButton alloc]initWithFrame:CGRectMake(90, 30, 55, 55)];
    singleimage.backgroundColor = [UIColor blueColor];
    [singleimage setTitle:@"uploadimage" forState:UIControlStateNormal];
    [singleimage addTarget:self action:@selector(launchController) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:singleimage];


        imagePicker = [[UIImagePickerController alloc]init];

使用其中的NSMutableArray存储UITextField值，并通过具有同一按钮上的功能的图像数组进行调用。

NSMutableArray *arr = [NSMutablearray....];
        for (UIView *subV in self.view.subviews){
             if([subV isKindOfClass:[UITextField class]])
    {
                //store it in a NSDictionary, so later can still know which 
                //textField your text belongs,
                 NSDictionary *tempDic = [NSDictionary dictionaryWithObjectAndKey:subV.txt 
                                   ,subV.tag,/*or subVw.placeholder*/,nil];
                [arr addObject:tempDic];

           }
        }

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