iOS UIWebView使用
1. 加载
WebView可直接加载.mp4，.pdf，.html，.doc等格式文件。
@interface ViewController ()
@property (nonatomic, strong) UIWebView *webView;
@end
@implementation ViewController
- (void)loadView {
self.webView = [[UIWebView alloc] initWithFrame:[UIScreen mainScreen].bounds];
self.view = self.webView;
}
- (void)viewDidLoad {
[super viewDidLoad];
self.webView.backgroundColor = [UIColor whiteColor];
// 加载网页
// NSURL *url = [[NSBundle mainBundle] URLForResource:@"index.html" withExtension:nil];
// 加载doc
// NSURL *url = [[NSBundle mainBundle] URLForResource:@"面向对象C.doc" withExtension:nil];
// 加载pdf
// NSURL *url = [[NSBundle mainBundle] URLForResource:@"史提夫乔布斯传.pdf" withExtension:nil];
// 播放视频
NSURL *url = [[NSBundle mainBundle] URLForResource:@"qixi.mp4" withExtension:nil];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[self.webView loadRequest:request];
// 自动检测电话号码、网址、邮件地址
self.webView.dataDetectorTypes = UIDataDetectorTypePhoneNumber;
// 缩放网页
self.webView.scalesPageToFit = YES;
}
@end
2. 与JS交互
1). OC调用JS代码
@interface ViewController () <UIWebViewDelegate>
@property (nonatomic, strong) UIWebView *webView;
@end
@implementation ViewController
- (void)loadView {
self.webView = [[UIWebView alloc] initWithFrame:[UIScreen mainScreen].bounds];
self.view = self.webView;
}
- (void)viewDidLoad {
[super viewDidLoad];
self.webView.backgroundColor = [UIColor whiteColor];
NSURL *url = [[NSBundle mainBundle] URLForResource:@"index.html" withExtension:nil];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[self.webView loadRequest:request];
self.webView.scalesPageToFit = YES;
// 设置代理
self.webView.delegate = self;
}
#pragma mark 代理方法
// 等待网页加载完成 才能执行js
- (void)webViewDidFinishLoad:(UIWebView *)webView {
// 调用网页中的函数
NSString *string = [webView stringByEvaluatingJavaScriptFromString:@"test();"];
NSLog(@"----%@", string);
}
index.html
<!DOCTYPE html>
<html xmlns="[http://www.w3.org/1999/xhtml](http://www.w3.org/1999/xhtml)">
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
<script>
function test() {
return "abc";
}
</script>
</head>
<body>
<br /> <br /><br />
11111111111
<br />abc
<br />
<a href="source:///showMessage:/helloworld">HelloWorld!</a>
<br />
<a href="http://www.baidu.com">baidu</a>
<br />
123@abc.com
<br />
http://www.baidu.com
<div id="container">
</div>
</body>
</html>
2). JS调用OC代码
@interface ViewController () <UIWebViewDelegate>
@property (nonatomic, strong) UIWebView *webView;
@end
@implementation ViewController
- (void)loadView {
self.webView = [[UIWebView alloc] initWithFrame:[UIScreen mainScreen].bounds];
self.view = self.webView;
}
- (void)viewDidLoad {
[super viewDidLoad];
self.webView.backgroundColor = [UIColor whiteColor];
NSURL *url = [[NSBundle mainBundle] URLForResource:@"index.html" withExtension:nil];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[self.webView loadRequest:request];
self.webView.scalesPageToFit = YES;
// 设置代理
self.webView.delegate = self;
}
#pragma mark 代理方法
// 发送请求之前， JS调用OC代码
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
// 获取url中的协议
NSLog(@"%@", request.URL.scheme);
// 判断协议是否是自定义协议
if ([request.URL.scheme isEqualToString:@"source"]) {
NSLog(@"%@", request.URL.pathComponents);
// 获取方法名
NSString *methodName = request.URL.pathComponents[1];
// 获取参数
NSString *param = request.URL.pathComponents[2];
// 调用方法
// 把字符串的方法名称转换为一个selector
SEL method = NSSelectorFromString(methodName);
if ([self respondsToSelector:method]) {
// 解决执行方法的内存泄漏问题
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
// 调用放法
[self performSelector: method withObject:param];
#pragma mark diagnostic pop
}
}
// 返回NO，所有的请求都不执行
return YES;
}
// 显示对话框
- (void)showMessage:(NSString *)str {
UIAlertController *vc = [UIAlertController alertControllerWithTitle:@"提示" message:str preferredStyle:UIAlertControllerStyleAlert];
// 弹出的按钮
UIAlertAction *action = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDestructive handler:^(UIAlertAction * _Nonnull action) {
NSLog(@"clicker");
}];
[vc addAction:action];
[self presentViewController:vc animated:YES completion:nil];
}
@end
