小编Fer*_*yan的帖子

var body: some View {
    NavigationView {
        ZStack {
            Color(UIColor.systemGroupedBackground).edgesIgnoringSafeArea(.all)
            ScrollView(showsIndicators: false) {
                if #available(iOS 15.0, *) {
                    VStack {
                        if self.viewModel.forms.isEmpty && !self.viewModel.isLoading {
                            Text("No Forms Assigned")
                                .foregroundColor(Color.gray)
                                .padding(.vertical, 20)
                                .accessibility(label: Text("No forms assigned"))
                        }
                        if self.viewModel.isLoading {
                            ActivityIndicator(isAnimating: .constant(true), style: .large).padding(.top, 20)
                        }
                        noFormsScrollView
                        Spacer(minLength: 16).accessibility(hidden: true)
                    }
                    .refreshable {
                        self.refreshData()
                    }
                } else {
                    // Fallback on earlier versions
                }
            }
        }.navigationBarTitle("Forms", displayMode: .inline)
    }
}

我正在尝试添加拉动以刷新我的ScrollView但它不起作用。我想知道我做错了什么。

Xcode 6.4不支持iOS 9(我的设备iOS)更新用于测试目的.有没有办法将我的设备连接到Xcode进行测试？

它向我展示了这些消息:

iPhone可能正在运行此版本的Xcode不支持的iOS版本.

源代码如下

let json = try NSJSONSerialization.JSONObjectWithData(data!, options: .AllowFragments)
                        if let blogs = json["profile_image_url"] as? String {

                            userImage = blogs//json["profile_image_url"] as! String
                            print("USER IMAGE:\(userImage)")

我是如何解决这个问题的

我想检测objective-c中的当前设备操作系统名称(如操作系统:iOS)

你能帮助我解决我的问题吗？

提前致谢

我正在尝试在用户拉动刷新后从 UIViewcontroller 向 SwiftUI View 发送通知。

 @objc private func fetchScheduleData(_ sender: UIRefreshControl) {
        NotificationCenter.default.post(name: Notification.Name(rawValue: "didPullToRefreash"), object: nil)
     
    }

在 SwiftUI 视图上我尝试设置此方法 .onchange()

   NotificationCenter.default.addObserver(self, selector: #selector(didPullToRefreashHelper), name: Notification.Name(rawValue: "didTapNotification"), object: nil)

但 onChange 它不起作用。我想知道我将如何做到这一点。

这是我的名字的代码LoginBg,我必须加密密码.如何从密码的输入字段获取文本并使用base64编码加密？

        export default class LoginBg extends React.Component {

    constructor(props) {
        super(props);
        this.state ={
            username:"",
            password:"",
        }

      }

      _handlePress() {
        console.log(this.state.username);
        console.log(this.state.password);
     }


    render(){

    return (
        <KeyboardAvoidingView behavior="position" style={styles.container}>
            <Text style={styles.heading}>- Login Page -</Text>
            <TextInput keyboardType='email-address' underlineColorAndroid='transparent'  onChangeText={(text) => this.setState({username:text})} placeholder="Email"  placeholderTextColor="#eaf4fc" style={styles.input}/>
            <TextInput secureTextEntry underlineColorAndroid='transparent' onChangeText={(text) => this.setState({password:text})} placeholder="Password" placeholderTextColor="#eaf4fc" style={styles.input}/>
            <Button onPress={() => this._handlePress()}>Login</Button>
            <Button>Register</Button>
        </KeyboardAvoidingView>
    );
    }
   }

我是Objective-c的新手.我正在学习目标-c.你能不能让我知道这段代码是如何工作的,你是否愿意帮助理解代表们在objective-c中的工作流程

SampleProtocol.h
#import <Foundation/Foundation.h>

@protocol SampleProtocolDelegate <NSObject>
@required
- (void) processCompleted;
@end

@interface SampleProtocol : NSObject

{

   id <SampleProtocolDelegate> _delegate; 

}
@property (nonatomic,strong) id delegate;

-(void)startSampleProcess;  

@end

在我添加SampleProtocol.m下面的代码后

#import "SampleProtocol.h"

@implementation SampleProtocol

-(void)startSampleProcess{

    [NSTimer scheduledTimerWithTimeInterval:3.0 target:self.delegate 
    selector:@selector(processCompleted) userInfo:nil repeats:NO];
}
@end

IBOutlet为标签创建一个并将其命名为myLabel并更新代码,如下所示采用SampleProtocolDelegateViewController.h

#import <UIKit/UIKit.h>
#import "SampleProtocol.h"

@interface ViewController : UIViewController<SampleProtocolDelegate>
{
    IBOutlet UILabel *myLabel;
}
@end

和更新的ViewController.m文件如下

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    SampleProtocol *sampleProtocol = [[SampleProtocol …