1.UIWebView的基本用法
#import "ViewController.h"
@interface ViewController () <UIWebViewDelegate>
@property (weak, nonatomic) IBOutlet UIWebView *webView;
@property (weak, nonatomic) IBOutlet UIBarButtonItem *backItem;
@property (weak, nonatomic) IBOutlet UIBarButtonItem *forward;
@end
@implementation ViewController
- (IBAction)back:(id)sender {
[self.webView goBack];
}
- (IBAction)forward:(id)sender {
[self.webView goForward];
}
- (IBAction)refresh:(id)sender {
[self.webView reload];
}
- (void)viewDidLoad {
[super viewDidLoad];
// Native(OC+Swift) + HTML5
self.webView.delegate = self;
// 网页内容缩小到适应整个设备屏幕
// self.webView.scalesPageToFit = YES;
// 检测各种特殊的字符串：比如电话、网站
self.webView.dataDetectorTypes = UIDataDetectorTypeAll;
[self.webView loadRequest:[NSURLRequest requestWithURL:[[NSBundle mainBundle] URLForResource:@"test" withExtension:@"html"]]];
// [self.webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.520it.com"]]];
// [self.webView loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:@"/Users/xiaomage/Desktop/test.pptx"]]];
// [self.webView loadData:<#(NSData *)#> MIMEType:<#(NSString *)#> textEncodingName:<#(NSString *)#> baseURL:<#(NSURL *)#>];
// [self.webView loadHTMLString:@"<html><body><div style=\"color: red; font-size:10px; border:1px solid blue;\">哈哈哈哈哈</div></body></html>" baseURL:nil];
self.webView.scrollView.contentInset = UIEdgeInsetsMake(20, 0, 0, 0);
}
#pragma mark - <UIWebViewDelegate>
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
// NSLog(@"%s", __func__);
self.backItem.enabled = webView.canGoBack;
self.forward.enabled = webView.canGoForward;
}
- (void)webViewDidStartLoad:(UIWebView *)webView
{
// NSLog(@"%s", __func__);
}
- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error
{
// NSLog(@"%s", __func__);
self.backItem.enabled = webView.canGoBack;
self.forward.enabled = webView.canGoForward;
}
/**
* 每当webView即将发送一个请求之前，都会调用这个方法
* 返回YES：允许加载这个请求
* 返回NO：禁止加载这个请求
*/
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
// NSLog(@"%@", request.URL);
if ([request.URL.absoluteString containsString:@"life"]) return NO;
// JS JavaScript
return YES;
}
@end
2.通过代理方法完成OC与js交互
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
// url == xmg://sendMessage_?200
NSString *url = request.URL.absoluteString;
NSString *scheme = @"xmg://";
if ([url hasPrefix:scheme]) {
// 获得协议后面的路径 path == sendMessage_number2_?200&300
NSString *path = [url substringFromIndex:scheme.length];
// 利用?切割路径
NSArray *subpaths = [path componentsSeparatedByString:@"?"];
// 方法名 methodName == sendMessage:number2:
NSString *methodName = [[subpaths firstObject] stringByReplacingOccurrencesOfString:@"_" withString:@":"];
// 参数 200&300
NSString *param = [subpaths lastObject];
NSArray *subparams = nil;
if (subpaths.count == 2 || [param containsString:@"&"]) {
subparams = [param componentsSeparatedByString:@"&"];
}
// 取出前面的2个参数
NSString *firstParam = [subparams firstObject];
NSString *secondParam = subparams.count <= 1 ? nil : [subparams lastObject];
[self performSelector:NSSelectorFromString(methodName) withObject:firstParam withObject:secondParam];
return NO;
}
NSLog(@"想加载其他请求，不是想调用OC的方法");
return YES;
}
