ios 以编程方式创建 UIWebView

Create UIWebView programmatically

提问by user1153798

I've been trying this for a while, but I'm not getting it right.

我已经尝试了一段时间，但我没有做对。

I have written the following init function in a supporting file:

我在支持文件中编写了以下 init 函数：

- (id)initWithFrame:(CGRect)frame
 {
    self = [super initWithFrame:frame];
    if (self) {
    webview=[[UIWebView alloc]initWithFrame:CGRectMake(0, 0, 1024,768)];
 }
    return self;
}

and following in ViewController.m

并在 ViewController.m 中关注

- (void)viewDidLoad
{
   [super viewDidLoad];

   UIWebView *view = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 1024, 768)];
   NSString *url=@"http://www.google.com";
   NSURL *nsurl=[NSURL URLWithString:url];
   NSURLRequest *nsrequest=[NSURLRequest requestWithURL:nsurl];
   [view loadRequest:nsrequest]; 
}

I also tried creating the webview in didFinishLaunchingWithOptions:method of appDelegate, but it also didn't work.

我也尝试在 appDelegate 的didFinishLaunchingWithOptions:方法中创建 webview ，但它也不起作用。

What is the correct way?

什么是正确的方法？

回答by Ashvin Ajadiya

I hope this solution will help you.

我希望这个解决方案能帮助你。

1. As per your problem, simply add these lines in - (void)viewDidLoad

1. 根据您的问题，只需将这些行添加到- (void)viewDidLoad

UIWebView *webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 1024, 768)];
NSString *urlString = @"https://www.google.com";
NSURL *url = [NSURL URLWithString:urlString];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
webView loadRequest:request];
[self.view addSubview:webView];

I have used the static frame of the webView, you can use according to your requirement.

UIWebView *webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 1024, 768)];
NSString *urlString = @"https://www.google.com";
NSURL *url = [NSURL URLWithString:urlString];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
webView loadRequest:request];
[self.view addSubview:webView];

webView的静态框架我用过，大家可以根据自己的需求使用。

1. But UIWebViewis deprecated: first deprecated in iOS 12.0 - No longer supported; please adopt WKWebView, so updated code for Objective C and Swift are below

2. 但UIWebView已弃用：首先在 iOS 12.0 中弃用 - 不再支持；请采纳WKWebView，因此目标 C 和 Swift 的更新代码如下

Swift:

迅速：

import WebKit

let theConfiguration = WKWebViewConfiguration()
let webView = WKWebView(frame: view.frame, configuration: theConfiguration)
let nsurl = URL(string: "https://www.google.com")
var nsrequest: URLRequest? = nil
if let nsurl = nsurl {
    nsrequest = URLRequest(url: nsurl)
}
if let nsrequest = nsrequest {
    webView.load(nsrequest)
}
view.addSubview(webView)

Objective C:

目标 C：

#import <WebKit/WKWebView.h>
#import <WebKit/WKWebViewConfiguration.h>

WKWebViewConfiguration *theConfiguration = [[WKWebViewConfiguration alloc] init];
WKWebView *webView = [[WKWebView alloc] initWithFrame:self.view.frame configuration:theConfiguration];
NSURL *nsurl=[NSURL URLWithString:@"https://www.google.com"];
NSURLRequest *nsrequest=[NSURLRequest requestWithURL:nsurl];
[webView loadRequest:nsrequest];
[self.view addSubview:webView];

回答by dasblinkenlight

It looks like you have forgotten to add webviewas a subview of its parent view:

看起来您忘记添加webview为其父视图的子视图：

-(id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        webview=[[UIWebView alloc]initWithFrame:CGRectMake(0, 0, 1024,768)];
        [self addSubview:webview];
    }
    return self;
}

Also viewDidLoadis not the right place to create subviews. You should expose webviewas a property of your view, and then access it from viewDidLoad, like this:

也viewDidLoad就是不创建子视图正确的地方。您应该将其webview作为视图的属性公开，然后从 访问它viewDidLoad，如下所示：

NSString *url=@"http://www.google.com";
NSURL *nsurl=[NSURL URLWithString:url];
NSURLRequest *nsrequest=[NSURLRequest requestWithURL:nsurl];
[[self.view webview] loadRequest:nsrequest]; 

回答by Muzahidul Islam

UIWebView *webView = [[UIWebView alloc]initWithFrame:CGRectMake(0, 0, 320, 568)];
webView.delegate = self;   
NSString *url=@"http://www.google.com";
NSURL *nsurl=[NSURL URLWithString:url];
NSURLRequest *nsrequest=[NSURLRequest requestWithURL:nsurl];
[webview loadRequest:nsrequest]; 
[self.view addSubview:webview];

Declare UIWebviewDelegate in the interface of the viewcontroller

在viewcontroller的界面中声明UIWebviewDelegate

回答by BharathRao

This is answer is slight improvement over @Ashvin Ajadiya's answer. To dynamically set the width and height of the web view according to your device use this code inside viewWillAppearor else it won't get proper device width and height

这个答案比@Ashvin Ajadiya 的答案略有改进。要根据您的设备动态设置 Web 视图的宽度和高度，请在viewWillAppear 中使用此代码，否则将无法获得正确的设备宽度和高度

-(void)viewWillAppear:(BOOL)animated
{
    UIWebView *webview=[[UIWebView alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width,self.view.frame.size.height)];
    NSString *url=@"http://www.google.com";
    NSURL *nsurl=[NSURL URLWithString:url];
    NSURLRequest *nsrequest=[NSURLRequest requestWithURL:nsurl];
    [webview loadRequest:nsrequest];
    [self.view addSubview:webview];
}