Question

我尝试使用UrlString调用Web服务但不确定如何调用它？我知道我需要放置代码的一部分，但不知道如何编码。我的.m文件的编码如下。如果有人能够对它有所了解或者有一个工作的例子会有很多帮助（阅读相当多的网页，现在到了突破点！）

@implementation ViewController
@synthesize characterimage;
@synthesize characterpicker;
@synthesize characters = _characters;

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    // Load up NSArray
    _characters = [[NSArray alloc] initWithObjects:@"bergerac" , @"biarritz" , @"chareleroi" , @"liege" , @"oostende" , nil];

}

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

#pragma mark - UIPickerView Methods

-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
    return 1;
}

-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
    return _characters.count;
}

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
    return [_characters objectAtIndex:row];
}

-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    //Create UIImage
    UIImage *bergeracimage = [UIImage imageNamed:@"Bergerac.JPG"];
    UIImage *biarritizimage = [UIImage imageNamed:@"Biarritz-Anglet-Bayonne_Airport_view_from_landing_strip.jpg"];
    UIImage *chareleroiimage = [UIImage imageNamed:@"Aéroport_de_Charleroi,_B737_Ryanair_-_2011.JPG"];
    UIImage *liegeimage = [UIImage imageNamed:@"Liege_airport.jpg"];
    UIImage *oostendeimage = [UIImage imageNamed:@"Luchthavengebouw_Antwerpen-Deurne.jpg"];

    switch (row) {
        case 0:
            characterimage.image = bergeracimage;
            self.urlString = @"http://www.google.com";
            break;
        case 1:
            characterimage.image = biarritizimage;
            break;
        case 2:
            characterimage.image = chareleroiimage;
            break;
        case 3:
            characterimage.image = liegeimage;
            break;
        case 4:
            characterimage.image = oostendeimage;
            break;
        default:
            characterimage.image = oostendeimage;
        break;
    }
}

- (IBAction)buttontapped:(UIButton *)sender
{
    //call your web service with self.urlString

}

@end

Answer 1

首先，您无法使用简单的url字符串调用Web服务。您需要使用Apple提供的一些api来调用Web服务。

您可以查看此示例：http://codewithchris.com/tutorial-how-to-use-ios-nsurlconnection-by-example/

这篇文章解释了如何使用NSURLConnection进行同步和异步请求。

另外，您可以通过NSURLConnection类参考。苹果给出了一些例子。

https://developer.apple.com/library/ios/documentation/cocoa/reference/foundation/classes/NSURLConnection_Class/Reference/Reference.html

使用UrlString调用Web服务

1 个答案: