Question

我想通过解析添加一些不可编辑的文本（它在我的应用程序中的玩具的一些描述），我坚持使用代码。

这部分（我认为）我应该改变，但不知道如何。

由于我已经这样了 - （void）retrieveFromParse {

    PFQuery *retrieveColors = [PFQuery queryWithClassName:@"Hracky1"];
    [retrieveColors findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
        if (!error) {
            colorsArray= [[NSArray alloc] initWithArray:objects];
        }
        [colorsTable reloadData];
    }];
    [self.colorsTable reloadData];
    [self.refreshControl endRefreshing];
}

这完全是TableViewcontroller.m

#import "TableViewController.h"
#import "CustomCell.h"


@interface TableViewController (){


}

@end
@implementation TableViewController


@synthesize colorsTable;


- (void) retrieveFromParse {

    PFQuery *retrieveColors = [PFQuery queryWithClassName:@"Hracky1"];
    [retrieveColors findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
        if (!error) {
            colorsArray= [[NSArray alloc] initWithArray:objects];
        }
        [colorsTable reloadData];
    }];
    [self.colorsTable reloadData];
    [self.refreshControl endRefreshing];
}

- (id)initWithStyle:(UITableViewStyle)style
{
    self = [super initWithStyle:style];
    if (self) {
        // Custom initialization
    }
    return self;
}


- (void)viewDidLoad
{
    [super viewDidLoad];

    [self performSelector:@selector(retrieveFromParse)];

    UIRefreshControl *refreshControl = [[UIRefreshControl alloc] init];

    self.refreshControl = refreshControl;

    [refreshControl addTarget:self action:@selector(retrieveFromParse)

forControlEvents：UIControlEventValueChanged];

}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    // Return the number of sections.
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    // Return the number of rows in the section.
    return colorsArray.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"colorsCell";

    CustomCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    PFObject *tempObject = [colorsArray objectAtIndex:indexPath.row];



     [cell.imageview setFile: [tempObject objectForKey:@"ImageURL"]];


    [cell.imageview loadInBackground];


    cell.cellTitle.text = [tempObject objectForKey:@"cellTitle"];
    cell.cellDescript.text = [tempObject objectForKey:@"cellDescript"];


    return cell;
}



@end

DetailViewController.m

#import "DetailViewController.h"
#import "Parse/Parse.h"

@interface DetailViewController ()

@end

@implementation DetailViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}
-(void)parseview
{
    NSString *showText = _textdescript.text;

    PFObject *addValues= [PFObject objectWithClassName:@"Hracky1"];
    [addValues setObject: showText forKey:@"TextView"];


}



- (void)viewDidLoad
{
    [super viewDidLoad];

    [self performSelector:@selector(parseview)];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

DetailViewController.h

> #import <UIKit/UIKit.h>
> 
> @interface DetailViewController : UIViewController
> <UITextViewDelegate>
> 
> @property (nonatomic, strong) IBOutlet UITextView *textdescript; @end

Answer 1

将属性添加到第二个视图控制器。在准备segue或使用标识符创建实例时设置它。

此代码：

- (void)parseview
{
    NSString *showText = _textdescript.text;

    PFObject *addValues= [PFObject objectWithClassName:@"Hracky1"];
    [addValues setObject: showText forKey:@"TextView"];
}

正在创建一个新的空解析对象并在其中设置一些文本。文本可能是nil或@""，因为您刚刚在发生这种情况时加载了视图（尽管您可能在XIB中有一些默认文本）。

你应该做的最有可能的事情是从Parse获取一个对象并询问它以获取文本，然后将其设置到视图上：

PFQuery *query = [PFQuery queryWithClassName:@"Hracky1"];
PFObject *object = [query getFirstObject]; // synchronous request, not ideal, look at getFirstObjectInBackgroundWithBlock

_textdescript.text = [object valueForKey:@"TextView"];

假设您在Parse中定义了一个类Hracky1，并且它有一个名为TextView的字符串变量。

Parse.com Textview不显示任何内容

1 个答案: