如何将 JSON 元素放入 UITextView？答案

【问题标题】：How to put JSON element into UITextView?如何将 JSON 元素放入 UITextView？
【发布时间】：2014-06-07 02:48:49
【问题描述】：

我有一个完美运行的 MySQL 数据库和一个 PHP 脚本。但是，我想知道如何将这些数据从 JSON 格式获取到 UITextView。我还有一个用 2 个其他 JSON 元素填充的表。谢谢！

TableInfo.h

#import <Foundation/Foundation.h>

@interface TableInfo : NSObject

@property (nonatomic, strong) NSString *Title;
@property (nonatomic, strong) NSString *SubTitle;
@property (nonatomic, strong) NSString *Description;

@end

HomeModel.h

 #import <Foundation/Foundation.h>

@protocol HomeModelProtocol <NSObject>

- (void)itemsDownloaded:(NSArray *)items;

@end

@interface HomeModel : NSObject <NSURLConnectionDataDelegate>

@property (nonatomic, weak) id<HomeModelProtocol> delegate;

- (void)downloadItems;

@end

HomeModel.m

#import "HomeModel.h"
#import "TableInfo.h"

@interface HomeModel()
{
    NSMutableData *_downloadedData;
}
@end

@implementation HomeModel

- (void)downloadItems
{
    // Download the json file
    NSURL *jsonFileUrl = [NSURL URLWithString:@"http://gandouhaiti.ueuo.com/service.php"];
    NSLog(@"Donwload the JSON file");

    // Create the request
    NSURLRequest *urlRequest = [[NSURLRequest alloc] initWithURL:jsonFileUrl];
    NSLog(@"Create the request");

    // Create the NSURLConnection
    [NSURLConnection connectionWithRequest:urlRequest delegate:self];
    NSLog(@"Create the NSURLConnection");
}

#pragma mark NSURLConnectionDataProtocol Methods

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    NSLog(@"Inititalize the data object");

    // Initialize the data object
    _downloadedData = [[NSMutableData alloc] init];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    // Append the newly downloaded data
    [_downloadedData appendData:data];
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    // Create an array to store the locations
    NSMutableArray *_locations = [[NSMutableArray alloc] init];

    // Parse the JSON that came in
    NSError *error;
    NSArray *jsonArray = [NSJSONSerialization JSONObjectWithData:_downloadedData options:NSJSONReadingAllowFragments error:&error];

    // Loop through Json objects, create question objects and add them to our questions array
    for (int i = 0; i < jsonArray.count; i++)
    {
        NSDictionary *jsonElement = jsonArray[i];

        // Create a new location object and set its props to JsonElement properties
        TableInfo *newdata = [[TableInfo alloc] init];
        newdata.Title = jsonElement[@"Title"];
        newdata.SubTitle = jsonElement[@"SubTitle"];
        newdata.description = jsonElement[@"Description"];

       // Add this question to the locations array
        [_locations addObject:newdata];
    }

    // Ready to notify delegate that data is ready and pass back items
    if (self.delegate)
    {
        [self.delegate itemsDownloaded:_locations];
    }
}

@end

【问题讨论】：

how to show JSON result data in UITextView in objective c的可能重复
我尝试使用这两种方法，但都没有成功。
在NSJSONSerialization 行之后添加NSLog( @"%@", jsonArray ); 并将结果发布在此处。也看看这篇文章，看看它是否有帮助cant-get-head-around-parsing-nested-json
当我添加NSLog( @"%@", jsonArray ); 时，我得到以下信息。 ( { Description = "Description Test"; SubTitle = "SubTitle Test"; Title = "Title Test"; } ) 这正是我的 JSON。 @user3386109
我明白了，所以问题不在于解析 JSON，而是将结果放入 UITextView。为此，请使用 NSString 的 stringWithFormat 方法创建一个包含 JSON 信息的字符串。您可以使用\n 在文本中强制换行。然后使用 UITextView 的.text 属性在文本视图中显示字符串。

标签： mysql objective-c json uitextview

【解决方案1】：

如果您想在 Storyboard 中的 UITextView 中显示 JSON，请尝试以下操作：

@implementation ViewController

NSString * JSON;
-(void) viewDidLoad
{
   JSON = //get data from remote;
   NSString *stringForTextView = @"";
   NSData *data =  [JSON dataUsingEncoding:NSUTF8StringEncoding];
   NSArray *array = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];
   if([array count] >0)
   {
      for(NSDictionary *d in array)
      {
      stringForTextView = [NSString stringWithFormat:@"Title:%@\nSubTitle:%@\nDescription:%@\n", [d valueForKey:@"Title"], [d valueForKey:@"SubTitle"], [d valueForKey:@"Description"]];
      }
   }
   _textView.text = stringForTextView;

}
@end

【讨论】：