Question

我正在尝试从服务器发送和返回数据。我确信数据是可用的，因为我可以在ResultsViewController.m中使用NSLog在目标输出中打印出来，但是使用TextView我不能。

这是代码：

ResultsViewController.h

@interface ResultsViewController : UIViewController <ServiceConnectorDelegate, UITextViewDelegate>
{}

@property (assign, nonatomic) IBOutlet UITextView *output;
@property (retain, nonatomic) IBOutlet UITextView *value1TextView;
@property (retain, nonatomic) IBOutlet UITextField *value1TextField;

- (void)sendString:(NSString *)str;

@end

ResultsViewController.m

- (void)sendString:(NSString *)str
{ 
    ServiceConnector *serviceConnector = [[ServiceConnector alloc] init];
    serviceConnector.delegate = self;
    [serviceConnector getTest: str];
}


- (void)requestReturnedData:(NSData *)data //called when data is returned
{ 
    NSDictionary *dictionary = [NSDictionary dictionaryWithJSONData:data];
    output.text = dictionary.JSONString; // set the textview to the raw string value of the data received

    value1TextField.text = [NSString stringWithFormat:@"%d",[[dictionary objectForKey:@"value"] intValue]];
    value1TextField.text = @"test";
    NSLog(@"%@",dictionary);
}

ServiceConnector.m

@implementation ServiceConnector
{
    NSData *receivedData;
}

- (void)getTest:(NSString *)str
{
    NSString *storedURL = str;
    NSString *urlstring = [NSString stringWithFormat:@"%@",storedURL];

    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:urlstring]];

    [request setHTTPMethod:@"GET"];
    [request addValue:@"getValues" forHTTPHeaderField:@"METHOD"]; //selects what task the server will perform

    //initialize an NSURLConnection  with the request
    NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
    if(!connection){
        NSLog(@"Connection Failed");
    }
}

可能是TextView存在问题，因为它没有响应这么简单的代码：

value1TextField.text = @"test";

要将应用程序连接到服务器，我使用Service Connector的委托，但我不确定我是否以正确的方式实现了委托。特别是当我定义

时

serviceConnector.delegate = self;

在另一个应用程序中，我使用Button实现委托，它可以工作：

- (IBAction)getDown:(id)sender 
{
    //perform get request
    ServiceConnector *serviceConnector = [[ServiceConnector alloc] init];
    serviceConnector.delegate = self;
    [serviceConnector getTest];
}

Answer 1

有几件事：

@property (assign, nonatomic) IBOutlet UITextView *output;

应该是strong这样的属性：

@property (strong, nonatomic) IBOutlet UITextView *output;

另外，请确保使用以下属性访问器：

self.value1TextField.text = @"test";

并确保您的File Owner为ResultsViewController并且它已连接到.xib

NSView没有显示消息

1 个答案: