ios - 'NSString' 没有可见的@interface 声明选择器 URLEncodeUsingEncoding

Question

我是ios新手，反对C。

我正在尝试对 url 进行编码，但是我收到了错误

/Users/zupportdesk/Desktop/MyIOSApps/ZDticketSystem/ZDticketSystem/ViewController.m:313:52: No visible @interface for 'NSString' declares the selector 'URLEncodeUsingEncoding:'

#import "ViewController.h"
#import "AppDelegate.h"
#import "ApplicationEnvironmentURL.h"
#import "AFNetworking/AFNetworking.h"
#import "HHAlertView/HHAlertView.h"
#import "MBProgressHUD/MBProgressHUD.h"
#import "AppDelegate.h"


@interface ViewController ()<UITextFieldDelegate, UIActionSheetDelegate> {
    ApplicationEnvironmentURL *applicationEnvironment;
    NSString *BASEURL;
    NSString *global_profileId;
    AppDelegate *delegate;
}

@property (nonatomic, strong) NSString *username;
@property (nonatomic, strong) NSString *password;
@end

@implementation ViewController
--- defaults methods here

- (void)setupProfileidURL:(NSString *)profileToken {
    NSString *encoded_profileToken = [profileToken URLEncodeUsingEncoding:NSUTF8StringEncoding];
    NSString *user_login_url = [applicationEnvironment get_user_api_url];
    BASEURL = [[user_login_url stringByAppendingString:@"Account/GetProfileDetails?profileToken="] stringByAppendingString:encoded_profileToken];
    NSLog(@"Base URL: %@", BASEURL);
}

我是这样调用方法的 [self setupProfileidURL:profileToken];

查看Holder头文件

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController

@property (weak, nonatomic) IBOutlet UITextField *tv_username;
@property (weak, nonatomic) IBOutlet UITextField *tv_password;

@end

我想实现这个https://madebymany.com/blog/url-encoding-an-nsstring-on-ios .谁能帮我解决这个 url 编码问题。

Answer 1

你收到了这条消息

No visible @interface for 'NSString' declares the selector 'URLEncodeUsingEncoding:'

因为 URLEncodeUsingEncoding 是在类别中定义的方法，而您没有在类中使用该类别，这就是您收到此消息的原因。

此外，CFURLCreateStringByAddingPercentEscapes 已从 iOS 中弃用，因此您可以使用 stringByAddingPercentEncodingWithAllowedCharacters

下面是你的函数的一个例子

- (void)setupProfileidURL:(NSString *)profileToken {
    NSString *encoded_profileToken = [profileToken stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];
    NSString *user_login_url = [applicationEnvironment get_user_api_url];
    BASEURL = [[user_login_url stringByAppendingString:@"Account/GetProfileDetails?profileToken="] stringByAppendingString:encoded_profileToken];
    NSLog(@"Base URL: %@", BASEURL);
} 

另外，根据@Larme 的评论，您可以创建一个类别并通过导入在您的应用程序中使用它。