iOS学习巩固笔记-UIWebView/JavaScript

- (void)loadRequest:(NSURLRequest *)request;

- (void)reload;

- (void)stopLoading;

- (void)goBack;

- (void)goForward;

@property(nonatomic) UIDataDetectorTypes dataDetectorTypes

@property(nonatomic,readonly,getter=canGoBack) BOOL canGoBack;

@property(nonatomic,readonly,getter=canGoForward) BOOL canGoForward;

@property(nonatomic,readonly,getter=isLoading) BOOL loading;

@property(nonatomic) BOOL scalesPageToFit;

- (void)webViewDidStartLoad:(UIWebView *)webView;

- (void)webViewDidFinishLoad:(UIWebView *)webView;

- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error;

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType;

alert(10);   //弹框
document.getElementById(‘test’);  //根据ID获得某个DOM元素

[self.webView goBack];     //回退
[self.webView goForward];   //前进
[self.webView reload];      //刷新

self.goBackBtn.enabled = webView.canGoBack;
self.fowardBtn.enabled = webView.canGoForward;

//设置网页自动适应
self.webView.scalesPageToFit = YES;

//设置检测网页中的格式类型，all表示检测所有类型包括超链接、电话号码、地址等。
self.webView.dataDetectorTypes = UIDataDetectorTypeAll;

self.webView.scrollView.contentInset = UIEdgeInsetsMake(50, 0, 0, 0);

//可以在该方法中拦截请求
-(BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
    return ![request.URL.absoluteString containsString:@"dushu"];
}

//开始加载网页，不仅监听我们指定的请求，还会监听内部发送的请求
-(void)webViewDidStartLoad:(UIWebView *)webView

//网页加载完毕之后会调用该方法
-(void)webViewDidFinishLoad:(UIWebView *)webView

//网页加载失败调用该方法
-(void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error

NSURL *url = [[NSBundle mainBundle] URLForResource:@"ithome.pdf" withExtension:nil];
[self.webView loadRequest:[NSURLRequest requestWithURL:url]];

NSString *str = [self.webView stringByEvaluatingJavaScriptFromString:@"sum()"];

//判断字符串是否以一个固定的字符开头，这里为A
[@"abc" hasPrefix:@"A"]

//截串操作
- (NSString *)substringFromIndex:(NSUInteger)from;

//切割字符串，返回一个数组
- (NSArray<NSString *> *)componentsSeparatedByString:(NSString *)separator;

//替换操作
- (NSString *)stringByReplacingOccurrencesOfString:(NSString *)target withString:(NSString *)replacement

//把string包装成SEL
SEL selector = NSSelectorFromString(sel);

#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
//-Warc-performSelector-leaks为唯一的警告标识,这里面的代码可以去除警告
[self performSelector:selector withObject:nil];
#pragma clang diagnostic pop

-(void)invacation
{
    //1.创建一个MethodSignature，签名中保存了方法的名称，参数和返回值
    //这个方法属于谁，那么就用谁来进行创建
    //注意：签名一般是用来设置参数和获得返回值的，和方法的调用没有太大的关系
    NSMethodSignature *signature = [ViewController instanceMethodSignatureForSelector:@selector(callWithNumber:andContext:withStatus:)];

    //注意不要写错了方法名称
    NSMethodSignature *signature = [ViewController methodSignatureForSelector:@selector(call)];

    //2.通过MethodSignature来创建一个NSInvocation
    NSInvocation中保存了方法所属于的对象|方法名称|参数|返回值等等
    NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:signature];  

    //2.1 设置invocation，来调用方法    
    invocation.target = self;
    invocation.selector = @selector(call);
    invocation.selector = @selector(callWithNumber:);
    invocation.selector = @selector(callWithNumber:andContext:);
    invocation.selector = @selector(callWithNumber:andContext:withStatus:);
   
    NSString *number = @"1761237846";
    NSString *context = @"玩游戏";
    NSString *status = @"上课的时候";
   
    //注意：
    //1.自定义的参数索引从2开始，0和1已经被self and _cmd占用了
    //2.方法签名中保存的方法名称必须和调用的名称一致
    [invocation setArgument:&number atIndex:2];
    [invocation setArgument:&context atIndex:3];
    [invocation setArgument:&status atIndex:4];
    
    //3.调用invok方法来执行
    [invocation invoke];
}

@throw  [NSException exceptionWithName:@"程序异常" reason:@"异常原因：数组越界" userInfo:nil];

NSString *info = [NSString stringWithFormat:@"%@找不到方法",NSStringFromSelector(aSelector)];

[NSException raise:@"抛出异常" format:info,nil];

NSSetUncaughtExceptionHandler (&UncaughtExceptionHandler);
void UncaughtExceptionHandler(NSException *exception) {

    NSArray *arr = [exception callStackSymbols];//得到当前调用栈信息
    NSString *reason = [exception reason];//非常重要，就是崩溃的原因
    NSString *name = [exception name];//异常类型    
    NSString *errorMsg = [NSString stringWithFormat:@"当前调用栈的信息：%@\nCrash的原因：%@\n异常类型：%@\n",arr,reason,name];
    //把该信息保存到本地沙盒，下次回传给服务器。
}

void UncaughtExceptionHandler(NSException *exception) {

    //获取异常崩溃信息    
    NSArray *callStack = [exception callStackSymbols];
    NSString *reason = [exception reason];
    NSString *name = [exception name];
    NSString *content = [NSString stringWithFormat:@"========异常错误报告========\nname:%@\nreason:\n%@\ncallStackSymbols:\n%@",name,reason,[callStack componentsJoinedByString:@"\n"]];
    

    //把异常崩溃信息发送至开发者邮件
    NSMutableString *mailUrl = [NSMutableString string];
    [mailUrl appendString:@"mailto:test@qq.com"];
    [mailUrl appendString:@"?subject=程序异常崩溃，请配合发送异常报告，谢谢合作！"];
    [mailUrl appendFormat:@"&body=%@", content];

    //打开地址
    NSString *mailPath = [mailUrl stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    [[UIApplication sharedApplication] openURL:[NSURL URLWithString:mailPath]];
}