iOS读取txt内容、base64 解码存储到本地、WkWebv

读取txt内容

    NSError *error;
    NSString *textContents=[NSString stringWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"test" ofType:@"txt"] encoding:NSUTF8StringEncoding error:&error];
    if (textContents ==nil) {
        NSLog(@"---error--%@",[error localizedDescription]);
    }

base64 解码存储到本地

  NSData *decodedImgData = [[NSData alloc] initWithBase64EncodedString:pdfStr options:NSDataBase64DecodingIgnoreUnknownCharacters];
     NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject];
     NSFileManager *fileManger = [NSFileManager defaultManager];
     NSString *signDirectory = [documentsDirectory stringByAppendingString:@"/sign"];
     //  创建目录
     [fileManger createDirectoryAtPath:signDirectory withIntermediateDirectories:YES attributes:nil error:nil];
     //  创建文件
     self.signPath = [signDirectory stringByAppendingPathComponent:@"sign.pdf"];
     //  写入文件
   BOOL isfinish =  [fileManger createFileAtPath:_signPath contents:decodedImgData attributes:nil];
//    NSLog(@"存储isfinish === %d",isfinish);

WkWebview 加载本地文件

            if (@available(iOS 9.0, *)) {
                [self.myWebView loadFileURL:[NSURL fileURLWithPath:localFileStr] allowingReadAccessToURL:[NSURL fileURLWithPath:localFileStr]];
            } else {
                 NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL fileURLWithPath:_localFileStr]];
                 [self.myWebView loadRequest:request];
            }

删除code编码

[str stringByRemovingPercentEncoding]

进行code编码

+ (NSString *)URLEncodedString:(NSString *)orString
{
    
    NSString *unencodedString = orString;
    NSString *encodedString = (NSString *)
    CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,
                                                              (CFStringRef)unencodedString,
                                                              NULL,
                                                              (CFStringRef)@"!*'();:@&=+$,/?%#[]",
                                                              kCFStringEncodingUTF8));
    
    return encodedString;
}

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