Xcode Web 视图.打开pdf文件时如何添加关闭/完成按钮 [英] Xcode WebView. How to add close/done button when pdf file is opened
问题描述
我有一个使用 WebView 的 iOS 小应用.
I have a small app for iOS that uses WebView.
当我从 WebView 打开 PDF 文件时,我无法关闭窗口或返回.如何在打开 PDF 文件时添加返回或关闭按钮.
When I open a PDF file from WebView, I can't close the window or go back. How to add the button back or close, when the PDF file is opened.
#import "HomeController.h"
@interface HomeController ()
@end
@implementation HomeController
- (void)viewDidLoad {
[super viewDidLoad];
NSURL *myURL = [NSURL URLWithString:@"http://test.mysite.com"];
NSURLRequest *myRequest = [NSURLRequest requestWithURL:myURL];
[myWebView loadRequest:myRequest];
}
@end
已编辑
//I create global BOOL isPdf in header file
@property (nonatomic, assign) BOOL isPdf;
//I make request in view did load
myWebView.delegate=self;
NSURL *myURL = [NSURL URLWithString:@"http://test.mysite.com"];
_isPdf = [myURL.lastPathComponent isEqualToString:@".pdf"];
NSURLRequest *myRequest = [NSURLRequest requestWithURL:myURL];
[myWebView loadRequest:myRequest];
NSLog(@"Run WebView with the URL");
//And then in my webview delegate method
- (void)webViewDidFinishLoad:(UIWebView *)webView{
if (_isPdf) {
UIBarButtonItem *backButton=[[UIBarButtonItem alloc]initWithTitle:@"Back" style:UIBarButtonItemStyleDone target:self action:@selector(backButtonPressed)];
self.navigationItem.rightBarButtonItem=backButton;
NSLog(@"Show back button %i", _isPdf);
}else{
self.navigationItem.rightBarButtonItem=nil;
NSLog(@"Not show back button %i", _isPdf);
}
}
// Add backButtonPressed method
-(void)backButtonPressed{
//update the method according to your need
if (myWebView.canGoBack) {
[myWebView goBack];
}else{
[self.navigationController popViewControllerAnimated:true];
}
}
推荐答案
你需要做三件事
- 确认 webview 委托
- 实现 webview 委托 webviewDidFinishLoad 方法
- 为按钮操作创建方法
首先确认view中的webview delegate确实加载了
First confirm the webview delegate in view did load
webview.delegate=self //(don't forgot to add the webview protocol <UIWebviewDelegate>)
第二个实现 webview 委托
Second implement webview delegate
-(void)webViewDidFinishLoad:(UIWebView *)webView{
if (webView.canGoBack) {
UIBarButtonItem *backButton=[[UIBarButtonItem alloc]initWithTitle:@"Back" style:UIBarButtonItemStyleDone target:self action:@selector(backButtonPressed)];
self.navigationItem.rightBarButtonItem=backButton;
}else{
self.navigationItem.rightBarButtonItem=nil;
}
}
第三个添加backButtonPressed方法
Third add backButtonPressed method
-(void)backButtonPressed{
//update the method according to your need
if (webview.canGoBack) {
[webview goBack]
}else{
[self.navigationController popViewControllerAnimated:true];
}
}
编辑
如果您只想在 pdf 上显示按钮,那么当您像在视图中所做的那样发出请求时,请创建一个全局 BOOL isPdf 并在您像
if you want to show button only on pdf then when you make request like your doing in view did load create a global BOOL isPdf and set it when you load request like
NSURL *myURL = [NSURL URLWithString:@"http://test.mysite.com"];
isPdf=[myURL.lastPathComponent isEqualToString:@".pdf"];
然后在您的 webview 委托方法中:-
and then in your webview delegate method :-
-(void)webViewDidFinishLoad:(UIWebView *)webView{
if (isPdf) {
UIBarButtonItem *backButton=[[UIBarButtonItem alloc]initWithTitle:@"Back" style:UIBarButtonItemStyleDone target:self action:@selector(backButtonPressed)];
self.navigationItem.rightBarButtonItem=backButton;
}else{
self.navigationItem.rightBarButtonItem=nil;
}
}
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