Question

使用标签栏传输数据的标准模式是什么？

Answer 1

在您的计算机上设置本地服务器（最终这将是在网站上托管的内容等）。为此，我建议如下：
下载XAMPP（http://www.apachefriends.org/en/xampp-macosx.html）按照说明
- 在应用程序中安装
- 在应用程序的XAMPP文件夹中创建htcdocs并为所有人编写
- 创建一个名为Tutorials（在htcdocs中）的新文件夹
- 添加一个名为index.php的新php文件
- 编写php代码（注意这不是安全的，只是一个非常基本的例子）

写道： //非常不安全，但这会找到函数参数名称

if(function_exists($_GET['f'])) {
    //If found, call the function with value as a parameter
   $_GET['f']($_GET['value']);
}
//actual function that takes in a number and finds the square of the number
function getLabel($number){
    //This variable response with parameter name is equal to the number times the number    
    $response['name']=$number*$number;
    //Return the data to the caller (in JSON encoded format)
    echo json_encode($response);
}

- 保存并关闭index.php文件

在Xcode中创建一个新项目，使用文本标签设置它将在屏幕上显示结果（如果您不知道如何执行此操作，那么非常简单的google教程）

在Xcode中设置连接

详细信息和步骤在.h和.m文件中说明（抱歉不确定为什么这里的代码部分没有这样显示）

//Step 1, add NSURLConnectionDataDelegate
    //.h
@interface ViewController : UIViewController<NSURLConnectionDataDelegate>
@property (strong, nonatomic) IBOutlet UILabel *answer;
@end

的.m

#import "ViewController.h"

@interface ViewController ()
{//step 2 local data objects
    NSMutableData*webData;
    NSURLConnection*connection;

}
@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];

    //Step 8 call (send) the request
    [self getData];
    // Do any additional setup after loading the view, typically from a nib.


    //NSDictionary*dict=[NSJSONSerialization se]
}
//Step 3 implement this method 
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{
    [webData setLength:0];
}

//Step 4 append the connection data to your object
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{
    [webData appendData:data];
}

//Step 5 Process results from request (called automatically when the data arrives)
-(void)connectionDidFinishLoading:(NSURLConnection *)connection{
    //Main parse

    //Web data

    NSError*error;

    //Dictionary serialized (processed) using JSON (Way of encoding data from a web request)
    NSDictionary*data=[NSJSONSerialization JSONObjectWithData:webData options:0 error:&error];

    //If data is nil, then print error
    if (data==nil) {
        NSLog(@"%@",error);
    }

    //Print the data
    NSLog(@"%@",data);

    //Get the numerical result from the dictionary key name
    NSNumber*num=[data valueForKey:@"name"];

    //Convert number to string
    NSString*label=[num stringValue];

    //Set the label to this result
    _answer.text=label;

}
//Step 7, actually initialize the request
-(void)getData{
    //I will break this down as if it where a generic method
    //Connect to the index.php file via this URL


    //Localhost/tutorials is the XAMPP folder on your computer

    //index.php is the php file

    //getLabel(int number){}
    //?f=getLabel (calling this method in the php file)

    //number=900
    //&value=900 is the parameter
    NSURL*url=[NSURL URLWithString:@"http://localhost/tutorials/index.php?f=getLabel&value=900"];

    //In the php file it does number*number and returns the results

    //URL request
    NSURLRequest*request=[NSURLRequest requestWithURL:url];

    //Set the connection
    connection = [NSURLConnection connectionWithRequest:request delegate:self];

    if (connection) {
        webData=[[NSMutableData alloc]init];
    }

    //*****Results of this request are processed by step 5

}//Step 6, in case data connection fails
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{
    NSLog(@"fail");

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

@end

tabbar委托的标准模式是什么

1 个答案: