将数据从Json提取到标签文本IOS中

因此，我使用pokedex API作为IOS和web服务的学习曲线

这是连接完成时我的DidReceiveData

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{
    //If the resposne recieved is good the call this function

   // NSLog(@"data is %@", data);

    //NSString *myString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

    //NSLog(@"string is %@", myString);
    //Put data into a string

    NSError *e = nil;

    pokeDictionary = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&e];

    NSLog(@"dictionary is %@", pokeDictionary);

}

这将Json输出到控制台，我可以像这样将其登录到控制台

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {

    // do something with the data

    // receivedData is declared as a method instance elsewhere

    NSLog(@"Succeeded!");

    NSLog(@"The Pokemon's name is %@", pokeDictionary[@"name"]);
    NSLog(@"The Pokemon's attack is %@", pokeDictionary[@"attack"]);
    NSLog(@"The Pokemon's speed is %@", pokeDictionary[@"speed"]);







}

{

    self.pokemonAttack.text = (@"The Pokemon's speed is %@", pokeDictionary[@"name"]);
    self.pokemonAttack.text = (@"The Pokemon's speed is %@", pokeDictionary[@"attack"]);
    self.pokemonSpeed.text = (@"The Pokemon's speed is %@", pokeDictionary[@"speed"]);



}

但是，我们尝试将Json提取到如下文本字段中

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {

    // do something with the data

    // receivedData is declared as a method instance elsewhere

    NSLog(@"Succeeded!");

    NSLog(@"The Pokemon's name is %@", pokeDictionary[@"name"]);
    NSLog(@"The Pokemon's attack is %@", pokeDictionary[@"attack"]);
    NSLog(@"The Pokemon's speed is %@", pokeDictionary[@"speed"]);







}

{

    self.pokemonAttack.text = (@"The Pokemon's speed is %@", pokeDictionary[@"name"]);
    self.pokemonAttack.text = (@"The Pokemon's speed is %@", pokeDictionary[@"attack"]);
    self.pokemonSpeed.text = (@"The Pokemon's speed is %@", pokeDictionary[@"speed"]);



}

错误是“表达式结果未使用”，我想我的主要问题是我对objective-c不太适应，只是在IOS中乱闯。为此，我表示歉意，并理解“做目标c课程”的评论

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如果你能给我指出正确的方向，我可以继续我的火试，我想我也应该很快转向swift。首先，你应该知道，当连接以增量方式加载数据时，委托方法

connection:didReceiveData:

可能会被多次调用。如果返回的数据非常短，则可能会调用一次，但很可能会在某个时候中断，因为您最终将尝试解析不完整的数据

关于你得到的警告-你不能像那样格式化字符串。您试图像调用NSLog一样使用字符串格式，但NSLog方法会为您进行格式设置。您需要这样做：

self.pokemonAttack.text = [NSString stringWithFormat:@"The Pokemon's speed is %@", pokeDictionary[@"speed"]];

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看一看。这将指导您正确连接字符串。感谢您的指针：）它确实返回（null），但至少它将我置于正确的路径返回null，因为在错误的位置调用了null，这是我的错